Sunny Mini Central
SMC 5000A / 6000A
Inverter for three-phase grid feeding
PV plants
Installation Guide Version 2.0 SMC50A_60A-IEN073320
IME-SMC50A_60A
SMA Technologie AG Content
Content
1 Notes on this Manual. . . . . . . . . . . . . . . . . . . . . . 7
1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Target Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Explanation of the Symbols Used . . . . . . . . . . . . . . . 7
2 The Sunny Mini Central . . . . . . . . . . . . . . . . . . . . 8
2.1 Appropriate Usage. . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Handling of the Sunny Mini Central . . . . . . . . . . . . . 9
3.2 Installer's Responsibilities . . . . . . . . . . . . . . . . . . . . 11
4 Overview of the Device . . . . . . . . . . . . . . . . . . . 12
4.1 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Electronic Solar Switch (ESS) . . . . . . . . . . . . . . . . . 15
4.4 Interior View . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Selecting an Installation Location . . . . . . . . . . . . . . 18
5.2 Required Tools and Materials . . . . . . . . . . . . . . . . 21
5.3 Mounting the Sunny Mini Central. . . . . . . . . . . . . . 22
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . 25
6.1 Required Tools and Materials . . . . . . . . . . . . . . . . 25
6.2 Connection Procedure. . . . . . . . . . . . . . . . . . . . . . 26
6.3 Connection of the DC Input . . . . . . . . . . . . . . . . . . 27
6.3.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.3.2 Connection of PV Strings. . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.3.3 Reverse Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
6.4 Connecting the AC Output . . . . . . . . . . . . . . . . . . 34
6.4.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Installation Guide SMC50A_60A-IEN073320 Page 3
Content SMA Technologie AG
6.4.2 Connecting the AC Output . . . . . . . . . . . . . . . . . . . . . . . . . . .41
6.4.3 The Line Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
7 The Communication Interface. . . . . . . . . . . . . . . 48
7.1 Connecting RS232, RS485, Sunny Beam . . . . . . . . 49
7.1.1 Jumper Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
8 Commissioning the Sunny Mini Central . . . . . . . 51
8.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8.1.1 Setting the Language of the Sunny Display . . . . . . . . . . . . . . . .54
8.2 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
9 Hand-over to the Operator . . . . . . . . . . . . . . . . 57
10 Opening and Closing the Sunny Mini Central . . 58
10.1 Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . 58
10.2 Opening of the Sunny Mini Central . . . . . . . . . . . . 59
10.3 Closing of the Sunny Mini Central . . . . . . . . . . . . . 60
11 Troubleshooting / Problem Solving . . . . . . . . . . 62
11.1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
11.2 The red LED is Continuously on . . . . . . . . . . . . . . . 63
11.2.1 Ground Fault Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
11.2.2 Checking the Varistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
12 Maintenance and Cleaning . . . . . . . . . . . . . . . . 67
12.1 Checking Heat Dissipation. . . . . . . . . . . . . . . . . . . 67
12.1.1 Cleaning the Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
12.1.2 Checking the Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
12.1.3 Cleaning the Handle Covers . . . . . . . . . . . . . . . . . . . . . . . . . .71
12.2 Inspection of the Electronic Solar Switch . . . . . . . . . 72
Page 4 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Content
13 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . 73
13.1 Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
13.2 Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
13.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
13.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
14 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . 75
14.1 Sunny Mini Central SMC 5000A . . . . . . . . . . . . . . 75
14.2 Sunny Mini Central SMC 6000A . . . . . . . . . . . . . . 78
14.3 General Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
14.4 Sunny Mini Central Operating Parameters . . . . . . . 82
14.4.1 Explanation of the Operating Parameters . . . . . . . . . . . . . . . . .82
14.4.2 Parameter Settings for Germany . . . . . . . . . . . . . . . . . . . . . . .87
14.4.3 Country-specific Parameter Settings . . . . . . . . . . . . . . . . . . . . .89
14.4.4 Fixed Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
15 Contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Installation Guide SMC50A_60A-IEN073320 Page 5
Content SMA Technologie AG
Page 6 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Notes on this Manual
1 Notes on this Manual
1.1 Validity
This installation guide covers the correct installation and commissioning of type Sunny
Mini Central SMC 5000A and SMC 6000A SMA inverters.
1.2 Target Group
Only trained electricians approved by the responsible energy supply company may
install and commission the inverters. The instructions assume that you, the installer, are
familiar with electrical installations and know the corresponding rules and regulations.
1.3 Explanation of the Symbols Used
This symbol indicates a fact which, if ignored, could result in damage to
components or personal hazard. Please read these sections especially
carefully.
This symbol indicates a fact that is important for optimum operation of the product.
Read these sections carefully to ensure this.
This symbol indicates an example.
Installation Guide SMC50A_60A-IEN073320 Page 7
The Sunny Mini Central SMA Technologie AG
2 The Sunny Mini Central
2.1 Appropriate Usage
The Sunny Mini Central is a photovoltaic inverter and serves to feed solar energy from
solar modules converted using photovoltaics into a low voltage grid with a nominal
voltage of 220 to 240 V and 50 Hz or 60 Hz.
Do not use the Sunny Mini Central for purposes other than those described
here. Alternative uses, modifications to the inverter as well as installing
components not recommended or sold by SMA void the warranty and
operating license.
Principle of a solar power system with a Sunny Mini Central SMC
5000A or SMC 6000A
L1
Distribution
L2
Electricity grid
L3
Solar modules
Page 8 SMC50A_60A-IEN073320 Installation Guide
Sunny Mini
Central
SMA Technologie AG Safety Instructions
3 Safety Instructions
3.1 Handling of the Sunny Mini Central
All work on and in the Sunny Mini Central must be carried out by a
qualified electrician. The electrician must be approved by the local energy
supplier.
Open and close the Sunny Mini Central only as described in section 10
"Opening and Closing the Sunny Mini Central" (Page 58) and follow the
safety instructions listed there.
The Sunny Mini Central weighs approximately 63 kg. Two people must
carry the unit or a suitable transport trolley must be used. Safety boots
must be worn.
The temperature of individual parts of the housing and of components
inside the Sunny Mini Central can reach more than 60 °C. Touching these
parts could result in severe burns.
Once the handle of the Electronic Solar Switch has been pulled out, the
Sunny Mini Central provides protection rating IP21. Thus it is no longer
protected against water seepage and foreign objects.
Check the system design using the Sunny Design program (www.SMA.de)
or by calling the Sunny Boy Serviceline before installing the Sunny Mini
Central. Overvoltages lead to the destruction of the Sunny Mini Central,
thereby voiding all warranty claims.
Avoid contact with the PV modules when they are running, as a minimal
displacement current could flow and cause a secondary accident due to
shock. Therefore, maintenance work may only be performed on the solar
generator when it is disconnected. Disconnecting the Sunny Mini Central
from the grid is not sufficient.
In addition, touchable conducting parts such as the framework of the PV
generator should be grounded.
Installation Guide SMC50A_60A-IEN073320 Page 9
Safety Instructions SMA Technologie AG
Follow the instructions in the pictograms, signs and labels on each inverter
and ensure that they are legible at all times.
General safety rules for working on photovoltaic systems:
1. Disconnecting the device
Before you start to work on the unit, disconnect all wires which could
carry voltage to the area you are working on!
2. Protect against reenergizing
To prevent the device from being reenergized ensure that you block
or lock it!
3. Test each unit to ensure that all voltages have been removed
Use a voltmeter to ensure that the unit is completely deenergized!
Ensure that all poles of the unit are free of voltage!
Page 10 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Safety Instructions
3.2 Installer's Responsibilities
Each person working on an electrical device is responsible for the safety
of all persons involved and for the safety of the device.
Be sure to observe all standards and regulations applicable to the
installation and site.
This installation guide, the operating manual and the documentation of installed
components must be kept in the immediate vicinity of the inverter and must be available
to installation, operation, maintenance and service staff at all times.
The inverter should only be used when it is safe to do so. All safety features must be
accessible at all times and their correct operation should be regularly tested.
Read this installation guide carefully and be sure to observe and understand all safety
regulations when installing and commissioning the system. You must also observe and
understand all connection requirements of the local energy supplier and all applicable
national codes and standards for installation of this equipment.
The information regarding operational safety refers to the regulations of the European
Union valid at the time the inverter was produced. The installer is obliged to make sure
that the mentioned safety measures comply with the regulations valid at the time and to
observe new regulations when installing the inverter. Outside the European Union, the
laws on occupational safety applicable in the deployment location of the device and
the respective national requirements must be adhered to.
In addition to the work safety measures in this installation guide, the general safety and
accident prevention regulations which apply where the inverter is installed and the valid
environmental protection regulations must be observed and followed.
Follow all instructions in this installation guide completely and without restrictions!
Installation Guide SMC50A_60A-IEN073320 Page 11
Overview of the Device SMA Technologie AG
j
4 Overview of the Device
4.1 Identification
You can identify the Sunny Mini Central with the aid of the name plate (see figure
below). The name plate is found on the right-hand side of the housing (when viewed
from the front). It contains information regarding the device type, serial number, devicespecific key data, the CE mark and SMA contact information.
The following is an example of a Sunny Mini Central SMC 6000A name plate:
SMA Technologie AG
www.SMA.de
Device type
SUNNY MINI CENTRAL
Photovoltaic string inverter Made in Germany
Model
Serial No.
SMC 6000A 2000165882
Serial number
V
DC max
V
DC MPP
I
DC max
V
AC nom
f
AC nom
P
AC nom
I
AC max
cos
VDE 0126-1-1 (2.06)
outdoor
*2000165882*
600 V
246-600 V
26 A
230 V
50/60 Hz
6000 W
26 A
1
GÜTEZEICHEN
Solar
Country-specific
standard for the
grid isolation point
according to which
the device may be
preset
Page 12 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Overview of the Device
4.2 Dimensions
242 mm
468 mm
613 mm
Installation Guide SMC50A_60A-IEN073320 Page 13
Overview of the Device SMA Technologie AG
Wall bracket and rear panel
0,2
7, 0
2,2
48,7
8,5
1,2
2,0
2,6 7, 8 11 ,0 2,2
2,6
1,0
43,3
Holes for wall bracket
Specifications in cm
2,0
1,2
7, 6
8,6
Holes for optional single-use
screws as anti-theft protection
0,9 (4 x)
1,2
5,8 2,5
Page 14 SMC50A_60A-IEN073320 Installation Guide
2,5
5,8
1,2
SMA Technologie AG Overview of the Device
4.3 Electronic Solar Switch (ESS)
The Sunny Mini Central is equipped with the integrated electronic DC loaddisconnecting switch ESS. This reliably prevents the arcing that usually occurs when
disconnecting the inverter from the PV generator, which can cause personal injury and
may damage the inverter connections. To access the DC input plugs in order to safely
disconnect the PV generator from the inverter, you only need to pull on a grip handle
on the base of the inverter.
Disconnecting the inverter thus becomes a three-step process:
1. Disconnecting the AC side
2. Pulling off the Electronic Solar Switch handle
3. Disconnecting the DC plug connectors
WARNING!
Safe disconnection from the PV generator is only guaranteed after
removal of the Electronic Solar Switch, and of all DC plug connectors.
Assembly
The Electronic Solar Switch consists of a handle on the
underside of the inverter, and an assembly inside the
inverter.
A handle is mounted on the underside of the inverter which
covers the PV generator's connectors.
A plug is inside the handle. The Electronic
Solar Switch's connector is only visible
Electronic Solar Switch handle
once the handle has been pulled.
The connector is fitted in the handle as a
floating connector, so that the handle
does not catch when being pulled from
the inverter.
Plug
Do not tighten the connector's screws. Otherwise, safe
disconnection cannot be guaranteed.
Installation Guide SMC50A_60A-IEN073320 Page 15
Overview of the Device SMA Technologie AG
4.4 Interior View
The following diagram gives a schematic overview of the various components and
connection points inside the Sunny Mini Central SMC 5000A and SMC 6000A with
the cover removed:
D
E F
C
G
B
A
H
M
Page 16 SMC50A_60A-IEN073320 Installation Guide
L
J
K
I
SMA Technologie AG Overview of the Device
A Varistors (Page 65)
B Connection terminals for communication (Page 48)
C Socket for communication Piggy-Back (RS232, RS485, radio) (Page 48)
D Jumper for communication (Page 48)
E Sunny Display (Page 54)
F Jumper for fan testing (Page 69)
G Operating status LEDs (Page 55)
H Connection terminals for mains cable (AC) (Page 41)
I Cable duct for mains cable (AC) (Page 41)
J Flat connection for grounding the cable shield for RS232 and RS485
communication (Page 48)
K Cable feed-throughs for communication (Page 48)
L Connection plug for ESS (Page 15)
M PV input plug (DC) (Page 28)
Installation Guide SMC50A_60A-IEN073320 Page 17
Installation SMA Technologie AG
5 Installation
5.1 Selecting an Installation Location
No. Checkpoint Control
Location
1 The installation location and
method of installation is suitable for
the weight of approximately 63 kg
and the dimensions of
468 mm x 613 mm x 242 mm
(width x height x depth) of the
Sunny Mini Central.
613 m m
4
6
8
m
m
m
m
2
4
2
63 kg
2 The following minimum clearances to walls, other devices or
objects must be observed to guarantee sufficient heat dissipation.
Direction Minimum
clearance
Sides 30 cm
Top 30 cm
Underside 50 cm
Front 5 cm
Page 18 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Installation
No. Checkpoint Control
3 If several Sunny Mini Central units are installed in areas where
high ambient temperatures are to be expected, the individual
Sunny Mini Central units must be far enough apart to ensure that
the individual Sunny Mini Central units do not intake the cooling
air of the neighboring unit.
If necessary, increase the clearances and ensure that the device is
sufficiently ventilated!
4 The Sunny Mini Central is accessible at any time (e.g. not mounted
on roofs that are difficult to access).
5 The Sunny Mini Central can be removed from the installation
location easily (by two people), in spite of its weight of 63 kg.
6 The Sunny Mini Central is not installed in areas
where highly flammable materials are stored
or in potentially explosive areas.
7 The Sunny Mini Central is not exposed to direct sunlight, in order
to avoid yield losses of the PV system.
8 The ambient temperature is always between -25 °C and +60 °C.
9 The Sunny Mini Central must be mounted such
that the inverter cannot be touched
inadvertently!
The temperature of individual parts of the
housing and of components inside the Sunny
Mini Central can reach more than 60 °C.
Touching these parts could result in severe
burns.
10
The Sunny Mini Central is installed in such a
way that it is not possible (e.g. for children) to
unintentionally unplug the DC plug connector.
Unintentionally pulling out the DC plug
connectors under load can damage the plugs
and could result in personal injury!
Installation Guide SMC50A_60A-IEN073320 Page 19
Installation SMA Technologie AG
No. Checkpoint Control
Position
11 The Sunny Mini Central is mounted vertically on a wall, or if it is
absolutely necessary, tilted back to an angle of max. 45°.
12 The Sunny Mini Central is installed so that it is not slanting
forward.
13 The Sunny Mini Central is not installed horizontally.
14 The Sunny Mini Central should ideally be installed at eye level to
allow operating conditions to be read at all times.
Foundation
15 The Sunny Mini Central is mounted on a solid surface.
16
The Sunny Mini Central is not mounted on
flammable construction materials.
17 In a living area, the Sunny Mini Central
should not be mounted on plasterboard walls
or alike as otherwise audible vibrations are
likely to result.
The Sunny Mini Central makes noises when
in use, which can be a disturbance in a living
area.
Page 20 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Installation
5.2 Required Tools and Materials
Number Tool/material Purpose
1 drill with a suitable drill bit drilling the holes for the wall bracket
2 - 4 wall anchors with a diameter of
10 mm
(for attachment to a concrete or
stone wall, for example)
2 - 4 8 mm x 60 mm hexagon bolts to
DIN 571 standard, stainless steel
type (for attachment to a concrete or
stone wall, for example)
1 appropriate spanner attaching the wall bracket to the wall
1 hexagon (allen) key (5 mm) attaching the Sunny Mini Central to
1 steel bar with max. diameter of
30 mm
Optional for anti-theft protection:
2 - 4 wall anchors with a diameter of
10 mm (for attachment to a concrete
or stone wall, for example)
2 - 4 corresponding single-use screw
systems (8 mm)
1 suitable screwdriver securing the single-use screws for
insertion in the holes in the wall for
the wall bracket
attaching the wall bracket to the wall
the wall bracket
poss. for carrying the Sunny Mini
Central (slide through the rear
housing opening)
insert in the holes in the wall for the
anti-theft screws
(if desired)
anti-theft protection of the Sunny Mini
Central (if required)
anti-theft protection
(if desired)
Installation Guide SMC50A_60A-IEN073320 Page 21
Installation SMA Technologie AG
5.3 Mounting the Sunny Mini Central
Only use the provided wall bracket for installation!
When mounting the device, be sure to take into account the weight of the Sunny
Mini Central of 63 kg!
Step Instruction
Mounting the Wall Bracket
1 For mounting the wall bracket, use two to four of the six holes in the middle.
2 Mark the positions of the drill holes by using the wall bracket as a drilling
template (see Page 14 for a sample).
3 Drill the holes, insert the wall anchors
and secure the wall bracket with
screws using corresponding washers.
Recommended bolts: 8 mm x 60 mm hexagon bolts
to DIN 571 standard, stainless steel type
Recommended wall
SX10
anchors:
Page 22 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Installation
Step Instruction
Mounting the Sunny Mini Central
4 When transporting and installing the
Sunny Mini Central, use the ergonomic
handles at the top and bottom at the
A
B
sides of the Sunny Mini Central (A), or
the housing opening, for example by
inserting a steel bar (B) (diameter max.
30 mm).
5 Hang the Sunny Mini Central using the
mounting holes on the rear face into
the wall bracket.
Take care to ensure that the Sunny
Mini Central locks audibly into place
in the wall bracket.
6 Fix the Sunny Mini Central to the wall
bracket using the two enclosed M6 x 8
mm bolts on both sides of the Sunny
Mini Central.
Fasten the bolts so that they are handtight!
7 Make sure that the Sunny Mini Central is positioned securely on the bracket.
Installation Guide SMC50A_60A-IEN073320 Page 23
Installation SMA Technologie AG
Step Instruction
8 Close the recessed grips with the
handle covers provided in the
accessories kit.
2
They are required to adequately
prevent insects entering the unit!
1
If required, new handle covers can be
ordered from SMA (contact: see
Page 92).
Optional Anti-theft Protection
9 To protect the Sunny Mini Central
against theft, the rear face can be
secured to the wall at the bottom using
2 so-called single-use bolts. The other
two holes are spare, in case you take
down the Sunny Mini Central and then
mount it again, and the screw stumps
from the first single-use bolts still
protrude from the wall.
The exact position of the holes can be seen in the illustration of the rear panel
in section 4.2 "Dimensions" (Page 13).
Page 24 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
6 Electrical Connection
6.1 Required Tools and Materials
Number Tool/material Purpose
2-8 PV plug connectors for the connecting cables of the solar
modules for connection to the Sunny
Mini Central
1 multimeter with DC input voltage
range up to at least 600 V
1 hexagon (allen) key (5 mm) opening and closing the housing
1 cable with external diameter
between 11 and 25 mm
1 stripping pliers stripping the AC cable
1 flathead screwdriver, 1 x 6 mm
or
Phillips screwdriver
PZ2 Pozidrive
1 terminal clamp (provided in
accessories kit)
1 hexagon socket screw
(M6x16, provided in accessories kit)
1 washer
(M6, provided in accessories kit)
1 grounding cable with a cross-section
between 4 and 10 mm²
1 line circuit breaker
(see Page 44 for rating)
checking the connecting wires of the
solar modules for correct polarity
and ensuring that the maximum input
voltage of the Sunny Mini Central is
not exceeded
cover and securing the additional
grounding terminal to the housing, if
required
AC connecting cable
using the screw clamps for the AC
connection
additional grounding of the housing
(if necessary)
additional grounding of the housing
(if necessary)
additional grounding of the housing
(if necessary)
additional grounding of the housing
(if necessary)
power circuit fuse
Installation Guide SMC50A_60A-IEN073320 Page 25
Electrical Connection SMA Technologie AG
6.2 Connection Procedure
When connecting the unit to the power supply, do not deviate from the
sequence described here!
The following figure shows the assignment of the individual housing ducts on the base
of the Sunny Mini Central.
ABA C D E
A Plug connectors for connecting the PV strings
B Plug connector for connecting the ESS (Electronic Solar Switch)
C Cable feed-throughs for optional communication via RS232, RS485 or radio
(PG16)
D Cable feed-through for grid connection (AC) (11 mm - 25 mm)
E is not used
Page 26 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
6.3 Connection of the DC Input
6.3.1 Requirements
For connecting the DC input, the following requirements must be satisfied:
1. The connected strings must consist of modules of the same type and number and
should have an identical orientation and tilt.
2. The connecting wires of the solar modules must be equipped with plug connectors
to allow the eight DC plug connectors of the Sunny Mini Central to be connected
to it.
A pre-assembled set for connecting the free cable ends from a string is available
as an optional accessory from SMA:
Connection set Order code Maximum
flow current
Multi-Contact 3 mm SWR-MC 21.0 A
Multi-Contact 4 mm MC-SET 30.0 A
Tyco TYCO-SET 30.0 A
3. Make sure that the following limit values at the DC input of the Sunny Mini Central
are not exceeded:
Device Maximum
input voltage
SMC 5000A 600 V (DC) 26.0 A (DC)
SMC 6000A 600 V (DC) 26.0 A (DC)
4. Check the system design and the string size using the design program Sunny
Design which is available to download free at www.SMA.de.
Installation Guide SMC50A_60A-IEN073320 Page 27
Maximum
input current
Electrical Connection SMA Technologie AG
6.3.2 Connection of PV Strings
NOTICE! The AC side of the Sunny Mini Central must be disconnected from
the grid before you connect the PV strings to the Sunny Mini Central!
To connect up the PV strings, follow these steps:
Step Instruction
1 Remove the Electronic Solar Switch on the
underside of the Sunny Mini Central.
2 Make sure the connecting cables of the
solar modules have the right polarity and do
not exceed the maximum input voltage of
the Sunny Mini Central (see section 6.3.1
"Requirements" (Page 27)).
WARNING! Dangerously high voltages may be present.
Danger of death! Make sure that you only use measuring
devices with a DC input voltage range up to at least 600 V!
3 Taking one DC plug connector at a time, measure the direct current voltage
between one DC plug connector of a string and ground potential.
If the measured voltages are constant and their total is roughly the same as
the open circuit voltage of the string, then there is a ground fault in this string.
Its approximate location can be deduced from the relationships between the
voltages.
4
WARNING! Do not connect strings to the Sunny Mini
Central that contain a ground fault until you have fixed the
ground fault in these strings!
5 Repeat step 2 for each string.
Page 28 SMC50A_60A-IEN073320 Installation Guide
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Step Instruction
6 Connect up the faultless PV generator strings
as indicated on the right.
7 Close the unused DC input sockets with the caps included in the delivery.
8 Reinsert the handle of the Electronic Solar
Switch in the socket on the underside of the
Sunny Mini Central.
The Electronic Solar Switch can be damaged if it has not
been attached properly. The handle must be firmly attached
to the Electronic Solar Switch's socket, and rest against the
housing. Check that the handle is positioned correctly
before recommissioning the inverter.
Installation Guide SMC50A_60A-IEN073320 Page 29
Electrical Connection SMA Technologie AG
6.3.3 Reverse Current
Advice on Generator Configuration for PV Systems Using the Sunny
Mini Central
In contrast to the Sunny Boy string inverters, three and more strings are usually
connected in parallel in the PV generator of a system using the Sunny Mini Central. This
does not sound particularly spectacular but it has practical consequences because, in
such large generators, certain faults which are totally uncritical in string systems must be
allowed for. Short circuits can cause wrongly directed module current, leading to a
solar module being subjected to so-called reverse current, which may be considerably
higher than the normal maximum current (short circuit) of the solar module.
How Does Reverse Current Occur?
In principle, reverse current can only occur when modules are connected in parallel
and the open circuit terminal voltage (open circuit voltage UPV 0) of the individual
parallel strings is different. In normal operation, this is avoided adequately when the
strings are of the same length. Since shadowing of the modules has no significant effect
on UPV 0, even in this situation no significant reverse current occurs.
In failure-free operation of a correctly dimensioned PV generator, no excessive reverse
current can occur!
Reverse current can only occur due to a fault in the solar generator (e.g. short circuit in
one or more modules) that causes the open circuit terminal voltage of a module string
to be significantly lower than the open circuit terminal voltage of other parallel strings.
In the worst case, the voltage on the faulty string may lie within the MPP voltage (UMPP)
of the remaining generator elements. The internal diode structure of the solar cells
causes reverse current to flow through the faulty generator string that, depending on the
amount of current, may lead to excessive heating or destruction of the modules in this
string.
Among other symptoms, the following faults may lead to reduction of the open circuit
terminal voltage of a generator string and subsequent reverse current in parallelconnected systems:
• Short circuit in one or more modules
• Short circuit in one or more cells in a module
• Double ground fault in a module and/or the cabling
Page 30 SMC50A_60A-IEN073320 Installation Guide
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-
+
Despite the fact that these faults are very unlikely, and extremely rare in practice,
preventative measures must still be taken. After all, these types of faults carry a high
potential for damage and danger, since all modules in the affected string may be
damaged and the local heating may also cause secondary damage.
Reverse current into the faulty string = Total current of the remaining strings
L
N
Installation Guide SMC50A_60A-IEN073320 Page 31
Electrical Connection SMA Technologie AG
How Can Reverse Current in the Modules be Prevented?
First we must explain that bypass diodes which are the current state-of-the-art in module
construction do not influence the reverse current in the module, but only reduce the
effect of any shadowing which may occur.
In order to prevent or to limit the reverse current into the modules, the following
standard methods can be applied:
1. String technology
All components in a string (modules, cable cross-section, plug connectors) must be
designed as reverse current for the remaining generator short-circuit current. In case of
parallel connection of maximum two strings, this is always the case, since the resulting
reverse current of a (defect) string can reach no higher value than the value of the short
circuit current of the (intact) string.
2. String diodes
The so-called string diodes connected in series with the individual strings prevent any
reverse current in the corresponding string. Disadvantage: The diode is always
connected in series to the corresponding generator string, the string current flows
through it and leads to correspondingly high continuous losses. Moreover, the failure
of the diode may cause the loss of the safety function or lead to the failure of the entire
string.
3. String fuses
String fuses connected in series to the individual strings can limit the reverse current in
the corresponding string to the permitted maximum. The losses at the string fuses are
significantly lower than in string diodes. Failure of a string fuse can be detected by
monitoring the fuse or by intelligent fault monitoring of the solar generator.
Only the first option is viable for low-cost systems.
Page 32 SMC50A_60A-IEN073320 Installation Guide
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Design Notes
Check the following points below:
Step Test
1 Do all the strings have the same number of series-connected modules?
2 How high is the maximum reverse current in a defective string at nominal
conditions?
Example: generator with 4 strings of modules at 5 A short-circuit current
The maximum reverse current is 3 x 5 A = 15 A.
3 Are the modules suitable for such a reverse current?
4 If not: Have appropriate measures been taken in order to avoid these
currents (e.g. string fuse in each string)?
5 Are the plug connectors of the modules and the inverter suitable for such a
reverse current?
6 Is the string wiring suitable for such a reverse current?
Installation Guide SMC50A_60A-IEN073320 Page 33
Electrical Connection SMA Technologie AG
6.4 Connecting the AC Output
6.4.1 Requirements
For connecting the AC output, the following requirements must be satisfied:
1. Connection Requirements
When connecting an inverter to the public grid, follow the connection requirements
of the local grid operator!
The Sunny Mini Central is designed for operation on 220 V - 240 V grids.
Additionally, it is equipped with an automatic grid frequency identifier and can
thus be connected to a 50 or 60 Hz system without further parameterization.
The following limit values for the AC output apply:
Limit values for AC output
Voltage range
(default setting per DIN VDE 0126-1-1)
Voltage range
(adjustable operating range)
Frequency range
(default setting per DIN VDE 0126-1-1)
Frequency range
(adjustable operating range)
198 V - 253 / 260 V
180 V - 265 V
47.5 Hz - 50.2 Hz
50 Hz: 45.5 Hz - 54.5 Hz
60 Hz: 55.5 Hz - 64.5 Hz
a)
a) The Sunny Mini Central can temporarily feed power into the grid with a
maximum output voltage of 260 V. However, DIN VDE 0126-1-1
stipulates that the average voltage over 10 minutes must not exceed 253
V. That means for example, if the grid voltage is constantly 254 V, the
inverter disconnects itself from the grid. In this case, contact the local grid
operator for assistance.
DIN VDE 0126-1-1 only applies in Germany. See section 14.4.3
"Country-specific Parameter Settings" (Page 89) for all other preset
country values of your inverter.
Page 34 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
2. Grid Impedance
Due to a high grid impedance, a high line resistance or a high voltage at the feedin point, a high AC voltage may result at the connection point of the Sunny Mini
Central. In Germany, the 10-minute average of the output voltage (Uac) of the
Sunny Mini Central is limited to 253 V according to DIN VDE 0126-1-1. If the
Sunny Mini Central records that the 10-minute average exceeds this voltage limit,
or if the 260 V limit is exceeded, it switches off immediately and displays a grid
error message. If voltage rise protection is not required in the relevant grid area
(outside Germany), it is deactivated by means of presetting the LDVtgC parameter
(see section 14.4 "Sunny Mini Central Operating Parameters" (Page 82)). In this
event, only the fast cut-off via the Uac-Max parameter intervenes.
The following diagram shows the power output the inverter can feed into the grid
per phase without leading to a switch-off because the AC voltage is too high.
Grid impedance [Ohm]
Output [kW] per phase
The following variables are needed to make an estimate:
- Grid voltage without mains supply
- Grid impedance at the terminal of the Sunny Mini Central
Installation Guide SMC50A_60A-IEN073320 Page 35
Electrical Connection SMA Technologie AG
The diagram shows the respective curves for a grid voltage without mains supply.
A maximum possible feed-in power per phase (X axis) is obtained for the
respective curves depending on the grid impedance (Y axis).
With three-phase connection and symmetrical feeding, the maximum possible
feed-in power per phase is approximately doubled.
Example:
- The grid voltage without mains supply is 230 V
- The grid impedance at the terminal is 1.0 Ohms
Grid impedance [Ohm]
Output [kW] per phase
The power read on the X axis is approximately 5.8 kW per phase.
Consequently, only one Sunny Mini Central may be installed per phase in this
example. A higher output per phase, without causing a disconnection because of
AC overvoltage, requires better connection conditions for the Sunny Mini Central
(e.g. a cable with a larger cross-section).
Page 36 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
Wi
3. Cable Connection
The connection terminals in the Sunny Mini
Central are suitable for wire cross-sections
External
diameter
re cross-
section
of up to 25 mm².
The external diameter of the cable must
therefore be between 11 mm and 25 mm.
If you use a cable with a cross-section
smaller than 14 mm (11 mm minimum), the
rubber bushing in the screw fitting must be replaced by the one included with the
inverter at delivery.
Strip approximately 16 mm of the insulation from the conductors of the cable. The
connection is made with three wires (L, N, PE).
4. Additional Grounding of the Housing
As well as the main protective earth connection at the AC terminal, the Sunny Mini
Central is also equipped with an additional protective earth connection directly on
the housing. This can be used if a second protective earth connection is required
by the energy supply company.
5. Wire Design
Do not use cables where the losses will exceed 1.0 %!
For optimum operation of the inverter, the grid impedance of the AC cable must
not exceed 1 Ohm. This is necessary, amongst other things, for the correct
operation of the impedance monitoring. The cable cross-section should be
dimensioned so output losses do not exceed 1 % at the nominal power. Output
losses depending on the cable length and cross-section are shown in the graphs
below. Multi-wire cables with copper forward and return conductors are used.
Use the following diagrams to check your wire design:
Installation Guide SMC50A_60A-IEN073320 Page 37
Electrical Connection SMA Technologie AG
Output losses of the Sunny Mini Central SMC 5000A
Do not use cables where losses will exceed 1.0 %
Output losses
Cable length
The following maximum cable lengths are possible for the different cable crosssections:
Cable cross-section 4.0 mm² 6.0 mm² 10.0 mm² 16.0 mm² 25.0 mm²
Max. cable length 12.4 m 18.6 m 31.1 m 49.7 m 77.7 m
With three-phase connection and symmetrical feeding, there is no load on the
neutral conductor, and the line losses are halved. Thus, the maximum possible
cable length is doubled.
Page 38 SMC50A_60A-IEN073320 Installation Guide
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Output losses of the Sunny Mini Central SMC 6000A
Do not use cables where losses will exceed 1.0 %
Output losses
Cable length
The following maximum cable lengths are possible for the different cable crosssections:
Cable cross-section 4.0 mm² 6.0 mm² 10.0 mm² 16.0 mm² 25.0 mm²
Max. cable length 10.3 m 15.5 m 25.9 m 41.4 m 64.8 m
With three-phase connection and symmetrical feeding, there is no load on the
neutral conductor, and the line losses are halved. Thus, the maximum possible
cable length is doubled.
Installation Guide SMC50A_60A-IEN073320 Page 39
Electrical Connection SMA Technologie AG
6. Line Circuit Breaker
The selection of the correct line circuit breaker depends on various factors. For
detailed information for the rating of a line circuit breaker, please refer to section
6.4.3 "The Line Circuit Breaker" (Page 44).
No loads should be connected to this
power circuit!
A circuit breaker's load disconnecting properties can be utilized to disconnect the
inverter from the grid under load.
A screw fuse element, e.g. D system (Diazed) or D0 system (Neozed) has no load
disconnecting properties, and thus may be used as cable protection, but not as a
load disconnection device.
Upon disconnection under load, the fuse element may be destroyed, or its
functionality may be inhibited by contact burning.
Page 40 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
6.4.2 Connecting the AC Output
To connect up the AC output, follow these steps:
Step Instruction
1 Check the grid voltage!
For Germany, the following applies: If the grid voltage is constantly higher
than 253 V, the Sunny Mini Central will not be fully operational. In this case,
contact the local grid operator for assistance. The inverter can temporarily
feed power into the grid with a maximum output voltage of 260 V. However,
the 10-minute average must not exceed 253 V.
2 Isolate the grid connection (switch the line
circuit breaker to its "off" position), make
sure it cannot be switched back on, and test
to make sure no voltage is present.
3 Make sure that the PV generator is not connected to the inverter!
4 Remove the screws that secure the housing
cover of the Sunny Mini Central. Put the
screws and the washers to one side so that
they do not get lost. Pull the cover forward
to remove it.
Off!
1. 2. 3.
Installation Guide SMC50A_60A-IEN073320 Page 41
Electrical Connection SMA Technologie AG
Step Instruction
5 Connect the protective earth (PE) of the
mains cable to the right terminal of the
terminal block (see figure to the right).
To do this, the PE wire must be 5 mm longer
than the L and N wires!
PE
PE conductor connection
If a second protective earth connection is required, you can use
the additional connection terminal directly on the Sunny Mini
Central's housing for this purpose.
Proceed as follows:
1. Insert the terminal clamp in the slits and
screw the terminal half tight with the
supplied M6x16 screw and washer.
The toothing of the washer must face
toward the terminal clamp.
2. Insert the stripped grounding cable.
3. Secure the terminal tightly.
6 Connect the mains cable as shown in the
figure. Use the supplied cable feed-through.
L
N
"L" and "N" must not be swapped!
"L" and "N" connection
Page 42 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
Step Instruction
7 Secure the housing cover by evenly tightening the two middle screws first.
Then tighten the four remaining screws as well and do not forget to also
reattach the washers. The toothing of the washers must face toward the
housing cover. The screws must be tightened with approximately 6 Nm
torque in order to guarantee both the sealing of the housing and the
grounding of the cover.
NOTICE! The grounding of the housing cover is ensured
by the toothed washers. Take care that for all six screws,
the washers are installed with the toothing against the
cover!
Installation Guide SMC50A_60A-IEN073320 Page 43
Electrical Connection SMA Technologie AG
6.4.3 The Line Circuit Breaker
Factors that Determine the Selection
Various factors should be taken into account when selecting line circuit breakers. These
include, for example:
• The type of cable used (conductor material and insulation)
• Ambient temperatures affect the cables (higher temperatures result in a reduced
maximum current load)
• Method of routing the cable (reduces the maximum current load)
• Bundling cables together (reduces the maximum current load)
• Loop impedance [Z] (in the event of a body contact this limits the current that can
flow and therefore determines the response behavior of the circuit breaker)
• Adequate separation between the circuit breakers to avoid excessive heating
•Selectivity
• Protection class of the connected load (VDE 0100, part 410, "Protection against
electric shock")
When installing the fuses, please always take the information in the manufacturer's
data sheets into account, e.g. in terms of installation distance and heat impact.
Also observe the following standards in all cases:
• DIN VDE 0298-4 (Cable routing and current-carrying capacity)
• DIN VDE 0100, part 430 (Protective measures; protection of cable and
cords against overcurrent)
• DIN VDE 0100, part 410 (Protective measures; protection against electric
shock)
• Country-specific standards applicable at the installation site
Page 44 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Electrical Connection
Rating of the Circuit Breakers
Example for the thermal rating for a line circuit breaker in a photovoltaic power-
generating system operated in parallel with the low voltage grid.
We assume a PV system with 9 Sunny Mini Central inverters with three inverters per
phase.
Required technical data of the Sunny Mini Central SMC 5000A / SMC 6000A
• Maximum output current = 26 A / 26 A
• Maximum permissible fuse protection for the Sunny Mini Central = 40 A
The choice of cable together with the way it is routed, ambient temperatures and
other underlying conditions limit the maximum fuse protection for the cable.
• In our example we assume that the chosen cable (6 mm²) is ideally routed and
can take a nominal current of 32.2 A.
Selecting the line circuit breakers:
• The maximum possible nominal current for the cable used and the maximum
possible fuse protection for the Sunny Mini Central limit the maximum possible
nominal current for the line circuit breaker.
• In our example, 32 A is possible (SMC 6000A)
• Additionally, check the thermal suitability of the line circuit breakers!
Installation Guide SMC50A_60A-IEN073320 Page 45
Electrical Connection SMA Technologie AG
Example for the thermal selection of a 32 A line circuit breaker with B sensitivity
with no gap between the circuit breakers:
When selecting line circuit breakers, a number of load factors need to be taken into
account. These can be found in the respective manufacturer's data sheets. For example,
one manufacturer's circuit breaker may be designed for an ambient temperature of 50
°C.
Load factors according to data sheet specifications:
• Reduction through permanent load >1 h = 0.9
• Reduction factor when 9 circuit breakers are arranged side-by-side without gaps
= 0.77
• Increase in nominal current as a result of ambient temperatures of 40 °C in the
circuit breaker panel = 1.07
b
c
a
Result:
The nominal load current for the line circuit breaker is calculated as:
Ibn = 32 A x 0.9 x 0.77 x 1.07 = 23.7 A
Summary:
The selected line circuit breaker cannot be used in our example case since the maximum
current-carrying capacity for fault-free operation is lower than the maximum output
current of the inverter used. It will trip under rated operating conditions!
Solution 1:
Use a 35 A line circuit breaker. As a result, the maximum current-carrying capacity
would be 26 A (Ibn = 35 A x 0.9 x 0.77 x 1.07 = 26 A) and the line circuit breaker
will not trip under rated operating conditions.
However, you should consider the underlying conditions once again! In this case, you
cannot use the previously selected 6 mm² cable anymore.
Solution 2:
Increase the distance between the line circuit breakers to 8 mm. This would mean that
the reduction factor is 0.98 instead of 0.77. As a result, the maximum current-carrying
capacity would be 30 A (Ibn = 32 A x 0.9 x 0.77 x 1.07 = 30 A) and the line circuit
breaker will not trip under rated operating conditions.
Recommendation by SMA: solution 2
a.
Permanent loads of longer than one hour are possible in photovoltaics.
b.
When only one circuit breaker is used, this factor = 1.
c.
Due to the fact that the circuit breakers are rated for 50 °C.
Page 46 SMC50A_60A-IEN073320 Installation Guide
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As well as the thermal rating of the circuit breakers, the applicable DIN VDE standards
must also be taken into account. The main ones that apply here are:
• DIN VDE 0100, part 410
• DIN VDE 0100, part 430
• DIN VDE 0298, part 4
In special applications the relevant standards must be followed.
Installation Guide SMC50A_60A-IEN073320 Page 47
The Communication Interface SMA Technologie AG
7 The Communication Interface
Installation or replacement of the communication interface is only to be
carried out by a qualified electrician.
The communication interface is used to communicate with SMA communication devices
(e.g. Sunny Boy Control, Sunny WebBox) or a PC with appropriate software
(e.g. Sunny Data Control). Depending on the selected communication interface, up to
2500 inverters can be interconnected. Detailed information on this topic can be found
in the communication device manual, or on the Internet at www.SMA.de.
This section describes the installation of the communication interface in the Sunny Mini
Central. The detailed wiring diagram for each communication interface can be found
in the communication device manual. This wiring diagram includes the following
information:
• Details on the required cable type
• Which of the inverter's connections are used
• Whether jumpers need to be mounted, and if so, which jumpers
• Whether the cable shield needs to be connected to the PE
With the Sunny Mini Central SMC 5000A and SMC 6000A, communication via
Powerline is not possible.
Page 48 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG The Communication Interface
7.1 Connecting RS232, RS485, Sunny Beam
Electrostatic discharges are an acute danger to the Sunny Mini Central and to the
communications interface. Ground yourself by touching PE or a non-coated part
of the housing before removing the communication interface from the packaging,
and before touching any components within the Sunny Mini Central.
Read the communication device manual before beginning installation work.
Further wiring details can be found there.
Step Instruction
1 Open the inverter as described in section 10.
2 Guide the PG screw fitting over the communication cable.
3 Thread the cable through the cable feed-through (A) on the Sunny Mini
Central.
4 Screw the PG screw fitting onto the Sunny Mini Central.
5 Sheathe the cable inside the Sunny Mini Central using the silicone tube
provided. The silicone tube is imperative for safety reasons. Without this
silicone tube, the interface may not be operated.
6 Lay the cable in area (B) as shown in the figure to the right.
7 Ground the cable shield at the PE connector (C) if the connection plan of the
communication device indicates this as necessary.
8 Connect the communication wires to the screw terminal strip (D) as
described in the connection plan of the communication device. Note down
the connector color coding for the respective pin numbers. Connecting the
receiver incorrectly can damage the devices.
• Pin 2 color: ______________________
• Pin 3 color: ______________________
• Pin 5 color: ______________________
• Pin 7 color: ______________________
9 Connect the jumpers (E) if the connection plan of the communication device
indicates this as necessary. The table shown to the right provides an
overview of the jumper functions.
10 Plug the communication interface to the left of the board (F).
11 Close the Sunny Mini Central as described in section 10.
Installation Guide SMC50A_60A-IEN073320 Page 49
The Communication Interface SMA Technologie AG
F
D
E
B
A
A Housing feed-throughs in the base of the Sunny Mini Central
B Cable route (gray surface)
C PE connector
D Screw terminals for connection of the communication wires
E Jumper slots
F Interface port
7.1.1 Jumper Functions
Jumper A Jumper B Jumper C
RS232 ---
RS485 termination bias 1 bias 2
Sunny Beam ---
A detailed description of the jumper functions can be found in the communication
device manual.
C
Page 50 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Commissioning the Sunny Mini Central
8 Commissioning the Sunny Mini Central
Proceed with commissioning the Sunny Mini Central only after:
• the housing cover is securely screwed shut,
• the DC cables (PV strings) are fully connected and the unused DC plug connectors
on the bottom of the housing are closed using the protective caps,
• the Electronic Solar Switch is securely attached,
• the AC (power) cable is fully connected and
• the line circuit breaker is laid out correctly.
Commissioning Procedure
Step Instruction
1 First of all, switch the line circuit breaker to
the "on" position.
2 Now look at the LED or the display to check
whether the Sunny Mini Central is in a faultfree operating status. If this is the case,
commissioning was successfully completed.
If the Sunny Mini Central shows other
messages or blink codes than those
described below, see the operating manual
of the Sunny Mini Central for their precise
meaning and possible solutions.
On!
Installation Guide SMC50A_60A-IEN073320 Page 51
Commissioning the Sunny Mini Central SMA Technologie AG
8.1 Display
After a normal grid connection of the Sunny Mini Central, it takes approximately one
minute until the following display messages are shown alternately. For this, the DC and
AC connections must be wired correctly and the circuit breaker must be switched on.
The display messages shown before that only have the purpose of indicating the
initialization of the Sunny Mini Central and the process of controlling whether the power
supply requirements are fulfilled.
Display Description
PV Overvoltage
!PV-Overvoltage!
!DISCONNECT DC !
If the message on the left appears,
the AC and DC cables must be
disconnected from the Sunny Mini
Central immediately! There is a risk
of damage to the Sunny Mini Central
resulting from excessive DC input
voltage!
1. Check the DC input voltage again to make sure
it is within the limits stated in section 6.3.1
"Requirements" (Page 27). If the input voltage is
too high, contact the planner / installer of the PV
generator for assistance.
2. If despite checking the DC input voltages the
display message occurs again when the PV
generator is connected to the Sunny Mini
Central, disconnect the PV generator from the
Sunny Mini Central again and contact SMA
(see section 15 "Contact" (Page 92)).
Working Mode
E-to day 0 Wh
Mode MPP
Pac 903W
Vpv 260V
E-to tal 0Wh
h-to tal 0h
Page 52 SMC50A_60A-IEN073320 Installation Guide
The energy generated today and the current
operating mode are displayed first.
The current feed-in output and the solar generator
voltage are displayed after 5 seconds or when you
tap the housing cover.
After a further 5 seconds, or when you tap again, the
total energy produced and the time the converter has
been connected to the grid are displayed. Then the
cycle begins again.
SMA Technologie AG Commissioning the Sunny Mini Central
Display Description
In case of failures
E-to day 0 Wh
Mode Disturbance
In case of a failure, the message "Disturbance" will be
indicated in the status bar.
Disturbance
Vac-Bfr
at: 261V
present: 245 V
Please refer to the operating manual of the Sunny Mini Central to read the
exact explanation of the error and status messages!
The exact error message follows.
For example, if the "Disturbance" message shown
here is displayed immediately after connection, it
may be due to the fact that the AC wire is not
correctly connected or the circuit breaker is not
switched on.
If a measured value is responsible for the fault
condition, then the value measured at the time of the
fault is displayed. If another measurement is possible,
the current value is displayed in the second line.
Installation Guide SMC50A_60A-IEN073320 Page 53
Commissioning the Sunny Mini Central SMA Technologie AG
8.1.1 Setting the Language of the Sunny Display
You can set the language of the Sunny Display using the switches on the underside of
the display assemblies inside the Sunny Mini Central. Proceed as follows:
1. Open the Sunny Mini Central as described in section 10.2 "Opening of the Sunny
Mini Central" (Page 59).
2. Set the switches for the required language, as shown below.
Language Switch S2 Switch S1
German BB
English BA
French AB
Spanish AA
3. Close the Sunny Mini Central as described in section 10.3 "Closing of the Sunny
Mini Central" (Page 60).
Page 54 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Commissioning the Sunny Mini Central
8.2 LEDs
After a normal grid connection of the Sunny Mini Central, it takes approximately one
minute until the following blink code is displayed. For this, the DC and AC inputs must
be correctly connected and the circuit breaker must be activated. The blink codes
shown before that only have the purpose of indicating the initialization of the Sunny
Mini Central and the process of controlling whether the power supply requirements are
fulfilled.
PV Overvoltage
If the blink code shown below appears, the AC and DC cables must be
disconnected from the Sunny Mini Central again immediately! There is a
risk of damage to the Sunny Mini Central resulting from excessive DC
input voltage.
The yellow LED lights up 4
times in succession.
The message is repeated 3 times and
then begins again.
1. Check the DC input voltage again to make sure it is within the limits stated in
section 6.3.1 "Requirements" (Page 27). If the input voltage is too high, contact
the planner / installer of the PV generator for assistance.
2. If despite checking the DC input voltage the blink code occurs again when the PV
generator is connected to the Sunny Mini Central, disconnect the PV generator
from the Sunny Mini Central again and contact SMA (see section 15 "Contact"
(Page 92)).
Installation Guide SMC50A_60A-IEN073320 Page 55
Commissioning the Sunny Mini Central SMA Technologie AG
Working Mode
The Sunny Mini Central is in normal working
Green LED
is on.
mode.
The green LED is continuously on.
In Case of Failures
In case the Sunny Mini Central detects an error, this is indicated through a blink code
of the yellow and red LEDs.
For example, if the yellow LED glows for 5 seconds immediately after connection, then
goes out for 3 seconds and then flashes briefly twice, there is a grid fault. In this case,
that may be due to the fact that the AC cable has not yet been cabled correctly or that
the line circuit breaker has not been switched on yet.
The yellow LED lights up 2
times in succession.
The message is repeated 3 times and
then begins again.
Please refer to the operating manual of the Sunny Mini Central to read the exact
explanation of the blink codes!
Page 56 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Hand-over to the Operator
9 Hand-over to the Operator
After installing the Sunny Mini Central successfully, hand the system over to the
operator. To do so, please use the following check list.
No. Checkpoint Control
What the operator should know:
1 operating principles of the PV system
2 switching the PV system on and off
3 meaning of the LEDs and display messages
4 maintenance and cleaning (handle covers, LEDs, display,...)
5 handling of additional communication components
6 contact partner in case of a failure
7 keep the documents to hand close to the Sunny Mini Central
The following documents are handed over to the operator:
1 operating manual of the Sunny Mini Central
2 installation guide of the Sunny Mini Central
3 declaration of conformity of the Sunny Mini Central
4 if necessary, all manuals for additional components (interfaces,
data logger, etc.)
5 data sheet for the solar modules used
6 diagram of the layout of the solar modules and their wiring
7 current circuit diagram of the unit
8 the complete registration and commissioning documents of the
local energy supply company
Installation Guide SMC50A_60A-IEN073320 Page 57
Opening and Closing the Sunny Mini Central SMA Technologie AG
10 Opening and Closing the Sunny Mini Central
10.1 Safety Instructions
Follow all safety instructions described in section 3 "Safety Instructions"
(Page 9).
High voltages are present in the device!
Inappropriate opening or closing of the Sunny Mini Central can cause
serious material damage or injury to persons which could be fatal.
Before working on the Sunny Mini Central with the cover removed, the AC
and DC voltages must therefore be disconnected from the Sunny Mini
Central and the capacitors must be discharged (wait for 30 minutes after
isolating the AC and DC voltage).
When working on the Sunny Mini Central and handling the module
assemblies, remember to observe all ESD safety regulations. Electronic
components are susceptible to electrostatic charge. Discharge any
electrostatic charge by touching the grounded housing while handling
any electronic component.
Page 58 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Opening and Closing the Sunny Mini Central
10.2 Opening of the Sunny Mini Central
Follow the sequence described below and all safety instructions in section
10.1 "Safety Instructions" (Page 58)!
Step Instruction
1 Switch the line circuit breaker to its "off"
position, make sure it cannot be switched
back on, and test to make sure no voltage is
present.
2 Pull the handle of the Electronic Solar Switch
off the Sunny Mini Central.
Be sure to pull the handle downwards and
slightly towards the wall. There is a contact
in the middle that automatically starts the
switching process when the handle is
pulled.
3 Directly after pulling off the Electronic Solar
Switch, pull out the DC plug connectors
from the Sunny Mini Central to totally
disconnect the PV generator from the Sunny
Mini Central.
Off!
1. 2. 3.
4 Wait for 30 minutes for the capacitors inside the Sunny Mini Central
to discharge.
5 Remove the six screws from the housing
cover and pull the cover forward smoothly.
Put the cover, the screws and the washers to
one side so that they do not get lost.
Installation Guide SMC50A_60A-IEN073320 Page 59
Opening and Closing the Sunny Mini Central SMA Technologie AG
10.3 Closing of the Sunny Mini Central
Follow the sequence described below and all safety instructions in section
10.1 "Safety Instructions" (Page 58)!
Step Instruction
1 Secure the housing cover by evenly
tightening the two middle screws with the
corresponding washers first. The toothing of
the washers must face toward the housing
cover. The screws must be tightened with
approximately 6 Nm torque in order to
guarantee both the sealing of the housing
and the grounding of the cover. Then
tighten the four remaining screws as well.
If you should lose a screw or washer, the
Sunny Mini Central accessories kit contains
a spare screw and spare washer.
NOTICE! The grounding of the housing cover is ensured
by the toothed washers. Take care that for all six screws,
the washers are installed with the toothing against the
cover!
2 Connect the PV generator by reconnecting
the DC plug connectors of the Sunny Mini
Central with those of the strings. Close the
unused DC input sockets with the caps
included in the delivery.
3 Check the Electronic Solar Switch for wear, as described in section 12.2
"Inspection of the Electronic Solar Switch" (Page 72).
Page 60 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Opening and Closing the Sunny Mini Central
Step Instruction
4 Reinsert the handle of the Electronic Solar
Switch in the socket on the underside of the
Sunny Mini Central.
The Electronic Solar Switch can be damaged if it has not
been attached properly. The handle must be firmly
attached to the Electronic Solar Switch's socket, and rest
against the housing. Check that the handle is positioned
correctly before recommissioning the inverter.
5 Switch the line circuit breaker to the "on"
position.
On!
6 Check whether the display or the LEDs on
the Sunny Mini Central indicate that the
device is functioning correctly (see section 8
"Commissioning the Sunny Mini Central"
(Page 51)).
Installation Guide SMC50A_60A-IEN073320 Page 61
Troubleshooting / Problem Solving SMA Technologie AG
11 Troubleshooting / Problem Solving
The Sunny Mini Central is a complex high-technology device. As a result, the
possibilities for fixing faults on site are limited to just a few items. Should the Sunny Mini
Central display other blink codes or display messages than those described in section
8 "Commissioning the Sunny Mini Central" (Page 51), please refer to the operating
manual of the Sunny Mini Central to find the exact explanation of the display message
or the blink code and details on troubleshooting.
Do not attempt any other repairs than those described here, but instead use the 24-hour
replacement service (the Sunny Mini Central is made ready for shipping within 24 hours
and then given to a shipping company) and the repair service of
SMA Technologie AG.
Inappropriate problem solving may cause serious injury to persons or
material damage. Faults must therefore be corrected by a trained
electrician.
11.1 overview
Green Red Yellow Plant status
glows continuously is not glowing is not glowing OK (working mode)
glows continuously is not glowing failure
glows continuously OK (initialization)
flashes quickly
(3 x per second)
flashes slowly
(1x per second)
briefly goes off
(approx. 1 x per
second)
is not glowing is not glowing is not glowing OK
is not glowing is not glowing OK (stop)
glows continuously is not glowing failure
is not glowing is not glowing OK (waiting,
grid monitoring)
glows continuously is not glowing failure
is not glowing is not glowing OK (derating)
glows continuously is not glowing failure
(overnight
shutdown)
glowing/flashing failure
glows continuously is not glowing failure
glowing/flashing failure
Page 62 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Troubleshooting / Problem Solving
11.2 The red LED is Continuously on
11.2.1 Ground Fault Testing
If the red LED on the Sunny Mini Central is continuously illuminated, it should be
checked whether there is a ground fault in the PV generator.
Follow the safety instructions in section 10.1 "Safety Instructions" (Page
58) and proceed as follows:
Step Instruction
1 Disconnect the Sunny Mini Central from both the DC and AC connections,
as described in section 10.2 "Opening of the Sunny Mini Central" (Page 59).
2 Taking one DC plug connector at a time,
measure the voltages between one DC plug
connector of a string and ground potential.
Pay attention to all safety instructions!
WARNING! Dangerously high voltages may be present.
Danger of death! Make sure that you only use measuring
devices with a DC input voltage range up to at least
600 V!
If the measured voltages are constant and their total is roughly the same as
the open circuit voltage of the string, then there is a ground fault in this string.
Its approximate location can be deduced from the relationships between the
voltages.
Installation Guide SMC50A_60A-IEN073320 Page 63
Troubleshooting / Problem Solving SMA Technologie AG
Step Instruction
3 Repeat points 3 and 4 for each string.
Event Measure
You have found a ground
fault.
Restart the Sunny Mini Central as described
from step 7 onwards, but without
reconnecting the faulty string. The PV
generator's installation engineer has to fix the
ground fault before you can reconnect this
string.
You have found no ground
fault.
It is likely that one of the thermally monitored
varistors is defective. In this case, proceed as
described in section 11.2.2 "Checking the
Varistors" (Page 65).
4 Commission the Sunny Mini Central as described in section 10.3 "Closing of
the Sunny Mini Central" (Page 60).
5 Check whether the display or the LEDs on
the Sunny Mini Central indicate that the
device is functioning correctly (see section 8
"Commissioning the Sunny Mini Central"
(Page 51)).
Page 64 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Troubleshooting / Problem Solving
11.2.2 Checking the Varistors
Varistors are wearing parts. Their functioning diminishes with age or following repeated
responses as a result of overvoltages. It is therefore possible that one of the thermally
monitored varistors has lost its protective function. You can now check these varistors in
the following way, paying attention to the safety instructions in section 10.1 "Safety
Instructions" (Page 58):
Step Instruction
1 Open the Sunny Mini Central as described in section 10.2 "Opening of the
Sunny Mini Central" (Page 59).
2 Use a continuity tester to check all the varistors and see if there is a
conducting connection between connectors 2 and 3. The positions of the
varistors in the Sunny Mini Central can be seen in the figure in section 4
"Overview of the Device" (Page 12).
Event Measure
There is a conducting
connection.
There is no conducting
connection.
It is likely that there is a different fault in the
Sunny Mini Central which has activated the
blink code.
Close the Sunny Mini Central again as
described in section 10.3 "Closing of the
Sunny Mini Central" (Page 60) and contact
the SMA Serviceline to discuss further steps.
The respective varistor is not working and
must be replaced.
The varistors are specially manufactured for
use in the Sunny Mini Central and are not
commercially available. They must be
ordered directly from SMA Technologie AG
(SMA order code: "SB-TV4").
To replace the part, proceed to step 3.
Installation Guide SMC50A_60A-IEN073320 Page 65
Troubleshooting / Problem Solving SMA Technologie AG
Step Instruction
3 Replace the varistor concerned with a new
one as shown in the illustration to the right.
Ensure the varistor is installed the right way
round! If you do not receive a special tool
for operating the terminal clamps together
with your replacement varistors, please
contact SMA. As an alternative, the terminal
Insert the
special tool to
open the
terminal clamp
contacts can be operated using a suitable
screwdriver. Since the failure of one varistor
is generally due to factors that affect all
varistors in a similar way (temperature, age,
Remove the
varistor
inductive overvoltages), you should replace
both varistors, not just the one that is
obviously defective.
The pole with the small
loop (crimp) must be fitted
to terminal 1 when
replacing the varistor
If no replacement varistors are locally
available, the Sunny Mini Central can
temporarily run without them. To do this,
remove the varistors you identified as
being faulty as described above and in
their place, bridge the terminals 2 and 3
with a length of wire.
An input modified in this way is no longer protected
against overvoltages! Replacement varistors should be
obtained as soon as possible. In systems with a high risk
of overvoltages, the Sunny Mini Central must not be
operated without varistors.
4 Close the Sunny Mini Central as described in section 10.3 "Closing of the
Sunny Mini Central" (Page 60).
Page 66 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Maintenance and Cleaning
12 Maintenance and Cleaning
The Sunny Mini Central has been constructed so that maintenance is kept to a minimum.
To guarantee safe operation, it is usually adequate to observe the following principles:
• Check the Sunny Mini Central visually for damage approximately every two
months.
• If necessary, clean the LEDs and the display with a damp cloth. Solvents, abrasives
or corrosive liquids must not be used.
• Regularly check that the display and the LEDs indicate the device is functioning
correctly. If necessary, correct faults using the explanation of the blink codes and
display messages contained in the operating manual of the Sunny Mini Central.
This information can also be obtained by using one of the communication options.
• Check the heat dissipation as described in section 12.1 "Checking Heat
Dissipation" (Page 67), if, during a visual inspection, you notice a marked buildup in the fan guard or if the inverter is increasingly in derating mode (see
explanation of the blink codes and display messages in the operating manual of
the Sunny Mini Central).
• Check the Electronic Solar Switch for wear every time before recommissioning, as
described in section 12.2 "Inspection of the Electronic Solar Switch" (Page 72).
12.1 Checking Heat Dissipation
12.1.1 Cleaning the Fans
If the fan guards are only covered in loose dust, they can be cleaned with a vacuum
cleaner. If you do not achieve satisfactory results with a vacuum cleaner, you can
dismantle the fans to clean them.
The Sunny Mini Central is fitted with two fans on its underside. In order to clean the fans,
proceed as follows:
DC
Plastic cover
Installation Guide SMC50A_60A-IEN073320 Page 67
AC
Maintenance and Cleaning SMA Technologie AG
Step Instruction
1 Disconnect the Sunny Mini Central from both the DC and AC connections,
paying attention to the safety instructions in section 3 "Safety Instructions"
(Page 9).
2 Wait for the fans to stop rotating.
3 Push the two latches at the upper edge of the black plastic cover to one side
and remove it carefully with the fan guards mounted behind. Clean the fan
guards with a soft brush, a paint brush, a cloth or compressed air. If the fans
are very dirty, you can clean them following the procedure laid out from step
4 onwards.
4 The fans are attached to the housing via
three snap fits. Press the two front snap
fits back and the rear snap fit forwards.
Snap fits for
dismantling the fan
5 Remove the fans by pulling them slowly and carefully downwards. The fan
cables are long enough that you can lift the fans far enough out to disconnect
the internal plug in the Sunny Mini Central. To do so, unlock the
corresponding plugs and remove them. You can now take out the fans and
clean them.
6 Clean the fans with a soft brush, a paint brush or a cloth and water. Under
no circumstances should you use compressed air to clean the fans as this can
damage them.
7 After cleaning, replace everything in reverse order. Subsequently, check that
the fans are functional as described in the next section.
Page 68 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Maintenance and Cleaning
12.1.2 Checking the Fans
If necessary, there are two different ways to check the fans are functional:
• Set the "Fan Test" parameter to "1" in the installer mode
(using Sunny Data, Sunny Data Control, the Sunny Boy Control data logger or
Sunny WebBox), or
• place the jumper on the controller board (the jumper required to check the fans is
included in the Sunny Mini Central accessories kit).
Check the fans as follows:
Step Instruction
Setting the Parameter
1 Request the installer password on the SMA Serviceline (contact: see Page
92).
2 Set the "Fan Test" parameter to "1" in the installer mode (using Sunny Data,
Sunny Data Control, the Sunny Boy Control data logger or Sunny WebBox).
3 Check the fans' air-flow. The Sunny Mini Central sucks air in from underneath
and then blows it back out on the upper sides. Listen for any unusual noise,
which could indicate incorrect installation or that the fans are faulty.
4 After checking the fans, set the "Fan Test" parameter back to 0.
Installation Guide SMC50A_60A-IEN073320 Page 69
Maintenance and Cleaning SMA Technologie AG
Step Instruction
Setting the Jumper
1 Open the Sunny Mini Central as described in section 10.2 "Opening of the
Sunny Mini Central" (Page 59).
2 Place the jumper on the controller board socket, as laid out below.
Jumper position for
checking the fans
3 Close the Sunny Mini Central as described in section 10.3 "Closing of the
Sunny Mini Central" (Page 60).
4 The Sunny Mini Central recognizes the jumper only after the system has been
restarted (i.e. all LEDs must have gone out before a restart).
5 Check the fans' air-flow. The Sunny Mini Central sucks air in from underneath
and then blows it back out on the upper sides. Listen for any unusual noise,
which could indicate incorrect installation or that the fans are faulty.
6 Once you have checked the fans, remove the jumper.
Open and close the Sunny Mini Central as described in section 10 "Opening
and Closing the Sunny Mini Central" (Page 58).
Page 70 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Maintenance and Cleaning
12.1.3 Cleaning the Handle Covers
There are handle covers on either side of the Sunny Mini Central. The Sunny Mini
Central sucks air in from underneath via the fan and blows it out again on the upper
sides. For optimum heat dissipation within the device, you have to clean both handle
covers. Proceed as follows when cleaning the handle covers:
Step Instruction
1 The handle covers of the Sunny Mini
Central are to be found on the sides of the
housing. Place your fingers in the space
between the top of the housing and the
handle covers and gently pull the handle
covers out of their bracket.
2 Clean the handle covers with a soft brush, a paint brush or compressed air.
3 Insert the handle covers back into the Sunny Mini Central. The handle covers
can only be inserted on the right or left side of the Sunny Boy respectively.
To help you identify the sides, "links/left" or "rechts/right" is printed on the
inside of the handle covers.
The handle covers must not be removed permanently, because
otherwise the device is not protected against the entrance of
insects! If required, you can order new handle covers from SMA
(contact: see Page 92).
Installation Guide SMC50A_60A-IEN073320 Page 71
Maintenance and Cleaning SMA Technologie AG
12.2 Inspection of the Electronic Solar Switch
Check the Electronic Solar Switch for wear before you attach it.
To do this, check the metal tongues on the inside of the plug for brown discoloration.
Metal tongues
If one of the metal tongues is completely burned out (see figure below), then the
Electronic Solar Switch can no longer safely disconnect the DC side. Replacements for
damaged Electronic Solar Switch handles are available from SMA.
Worn-out metal tongues
Page 72 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Decommissioning
13 Decommissioning
13.1 Disassembly
You must follow the sequence described below and all safety instructions
in sections 3 and 10.1!
Step Instruction
1 Open the Sunny Mini Central as described in section 10.2 "Opening of the
Sunny Mini Central" (Page 59).
2 Disconnect the AC cable.
3 Close the Sunny Mini Central with the six screws and the corresponding
washers.
4 Remove the two screws on the left and right
side of the Sunny Mini Central that attach it
to the wall bracket.
5 Disconnect the anti-theft protection, if applicable.
6 Remove the Sunny Mini Central upwards, keeping it in vertical position.
7 Remember that the Sunny Mini Central weighs 63 kg!
Installation Guide SMC50A_60A-IEN073320 Page 73
Decommissioning SMA Technologie AG
Step Instruction
8 When transporting the Sunny Mini Central,
use the ergonomic handles at the top and
bottom at the sides of the Sunny Mini
Central (A) or the housing opening, for
example, by sliding a steel bar through it (B)
(diameter max. 30 mm).
A
B
13.2 Packaging
If possible, please pack the Sunny Mini Central in the original packaging. If this is no
longer available, a similar box can be used which can withstand the weight of the
Sunny Mini Central (63 kg), has a handle system and can be closed fully.
13.3 Storage
Store the Sunny Mini Central in a dry place where ambient temperatures are always
between -25 °C and +60 °C.
13.4 Disposal
Dispose of the Sunny Mini Central at the end of its service life in accordance with the
disposal regulations for electronic scrap which apply at the installation site at that time.
Alternatively, send it back to SMA with shipping paid by sender, and labeled "FOR
DISPOSAL" (contact: see Page 92).
Page 74 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Tec hnic al Da ta
14 Technical Data
14.1 Sunny Mini Central SMC 5000A
Description Short
Setting
descr.
PV Generator Connection Data
Max. input open circuit voltage U
600 V (based on -10 °C cell
PV 0
temperature)
Input voltage, MPP range U
213 V - 600 V @ UACmin
PV
(246 V - 600 V DC @ 230 V AC)
Max. input current I
PV, max
Max. input power P
All-pole isolator on
26 A
5750 W
DC
DC plug connector
the DC input side
Overvoltage protection thermally monitored varistors
Voltage ripple U
< 10 % of the input voltage
PP
Personal protection Insulation monitoring (Riso > 1 MW)
Operating consumption < 7 W
Reverse polarity protection via short-circuit diode
Installation Guide SMC50A_60A-IEN073320 Page 75
Technical Data SMA Technologie AG
Description Short
Setting
descr.
Grid Connection Data
Nominal output power P
Peak output power P
Nominal output current I
Max. output current I
Harmonic distortion of output current
ACnom
AC, max
ACnom
AC, max
K
IAC
5000 W
5500 W
21.7 A
26 A
< 4 %
(at KUgrid < 2 %,
PAC > 0.5 PACnom)
Short-circuit proofing current control
Nominal operational voltage U
Operating range, grid voltage
ACnom
U
230 V
198 ... 253 V / 260 Va
AC
(complying with
DIN VDE 0126-1-1)
Voltage range
U
AC
180 V - 265 V
(extended operating range)
Nominal operating frequency f
Operating range, grid frequency
ACnom
50 Hz / 60 Hz
f
47.5 Hz - 50.2 Hz
AC
(complying with
DIN VDE 0126-1-1)
Frequency range
(extended operating range)
f
50 Hz: 45.5 Hz - 54.5 Hz
AC
60 Hz: 55.5 Hz - 64.5 Hz
All-pole isolator on grid side automatic disconnection device
(SMA grid guard 2)
Power factor cos phi 1
Overvoltage category III
Test voltage (50 Hz) 2 kV
Test surge voltage 4 kV (serial interface: 6 kV)
Operating consumption in night
0.25 W
mode
Page 76 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Tec hnic al Da ta
Description Short
Setting
descr.
Efficiency
Max. efficiency ηmax 96,1 %
CEC rebate efficiency euro 95,2 %
Weight
Weight approx. 62 kg
a) The Sunny Mini Central can temporarily feed power into the grid with a
maximum output voltage of 260 V. However, DIN VDE 0126-1-1 stipulates that
the average voltage over 10 minutes must not exceed 253 V. That means for
example, if the grid voltage is constantly 254 V, the inverter disconnects itself
from the grid. In this case, contact the local grid operator for assistance.
DIN VDE 0126-1-1 only applies in Germany. See section 14.4.3 "Countryspecific Parameter Settings" (Page 89) for all other preset country values of
your inverter.
Efficiency Curve of the SMC 5000A
The efficiency of the Sunny Mini Central depends mainly on the input voltage of the
connected PV strings. The lower the input voltage, the higher the efficiency.
Overall efficiency [%]
Output power [W]
Installation Guide SMC50A_60A-IEN073320 Page 77
Technical Data SMA Technologie AG
14.2 Sunny Mini Central SMC 6000A
Description Short
Setting
descr.
PV Generator Connection Data
Max. input open circuit voltage U
PV 0
600 V (based on -10 °C cell
temperature)
Input voltage, MPP range U
PV
213 V - 600 V @ UACmin
(246 V - 600 V DC @ 230 V AC)
Max. input current I
Max. input power P
All-pole isolator on
PV, max
DC
26 A
6300 W
DC plug connector
the DC input side
Overvoltage protection thermally monitored varistors
Voltage ripple U
PP
< 10 % of the input voltage
Personal protection insulation monitoring
(Riso > 1 MW)
Operating consumption < 7 W
Reverse polarity protection via short-circuit diode
Page 78 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Tec hnic al Da ta
Description Short
Setting
descr.
Grid Connection Data
Nominal output power P
Peak output power P
Nominal output current I
Max. output current I
Harmonic distortion of output current
ACnom
AC, max
ACnom
AC, max
K
IAC
6000 W
6000 W
26 A
26 A
< 4 %
(at KUgrid < 2 %,
PAC > 0.5 PACnom)
Short-circuit proofing current control
Nominal operational voltage U
Operating range, grid voltage
ACnom
U
AC
230 V
198 ... 253 V / 260 V
a
(complying with
DIN VDE 0126-1-1)
Voltage range
U
AC
180 V - 265 V
(extended operating range)
Nominal operating frequency f
Operating range, grid frequency
ACnom
f
AC
50 Hz / 60 Hz
47.5 Hz - 50.2 Hz
(complying with
DIN VDE 0126-1-1)
Frequency range
(extended operating range)
f
AC
50 Hz: 45.5 Hz - 54.5 Hz
60 Hz: 55.5 Hz - 64.5 Hz
All-pole isolator on grid side automatic disconnection device
(SMA grid guard 2)
Power factor cos phi 1
Overvoltage category III
Test voltage (50 Hz) 2 kV
Test surge voltage 4 kV (serial interface: 6 kV)
Operating consumption in night
0.25 W
mode
Installation Guide SMC50A_60A-IEN073320 Page 79
Technical Data SMA Technologie AG
Description Short
Setting
descr.
Efficiency
Max. efficiency max 96.1 %
CEC rebate efficiency euro 95,2 %
Weight
Weight approx. 63 kg
a) The Sunny Mini Central can temporarily feed power into the grid with a
maximum output voltage of 260 V. However, DIN VDE 0126-1-1 stipulates that
the average voltage over 10 minutes must not exceed 253 V. That means for
example, if the grid voltage is constantly 254 V, the inverter disconnects itself
from the grid. In this case, contact the local grid operator for assistance.
DIN VDE 0126-1-1 only applies in Germany. See section 14.4.3 "Countryspecific Parameter Settings" (Page 89) for all other preset country values of
your inverter.
Efficiency of the SMC 6000A
The efficiency of the Sunny Mini Central depends mainly on the input voltage of the
connected PV strings. The lower the input voltage, the higher the efficiency.
Overall efficiency [%]
Output power [W]
Page 80 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Tec hnic al Da ta
14.3 General Data
General Data
Protection rating in accordance
with DIN EN 60529
Climatic conditions (DIN EN 50178:1998-04):
Location of type C: class 4K4H
Transport of type E: class 2K3
Max. operating altitude 2000 m above sea level
Fan connections designed for safe disconnection in accordance with
Dimensions (W x H x D) 468 mm x 613 mm x 242 mm (approx.)
External Interfaces
Data transfer via separate
data cable
Wireless data transmission optional
IP65
Extended temperature range: -25 °C to +60 °C
Extended humidity range: 0 - 100 %
Extended air pressure range: 79.5 kPa to 106 kPa
Temperature range: -25 °C to +70 °C
DIN EN 50178:1998-04
optional, (RS232 / RS485, galvanically isolated)
Electronic Solar Switch (ESS)
Mechanical service life
min. 1,000 switching processes
(without current):
Electrical service life
min. 50 switching processes
(in case of short circuit,
with nominal current of 30 A):
Max. switching current 30 A
Max. switching voltage 800 V
Max. PV power approx. 10 kW
Protection rating when
IP65
plugged
Protection rating when
IP21
unplugged
Installation Guide SMC50A_60A-IEN073320 Page 81
Technical Data SMA Technologie AG
14.4 Sunny Mini Central Operating Parameters
Unauthorized changes to the operating parameters may result in:
• injury or accidents as a result of changing the internal safety
specifications of the Sunny Mini Central,
• voiding the Sunny Mini Central operating approval certificate,
• voiding the Sunny Mini Central warranty.
Never change the parameters of your Sunny Mini Central without express
authorization by the local energy supply company and instructions from
SMA.
14.4.1 Explanation of the Operating Parameters
Name Explanation
ACVtgRPro Voltage rise protection (only relevant for Germany).
The Sunny Mini Central can feed into the public grid with up to 260
V AC. However, DIN VDE 0126-1-1 stipulates that the average AC
voltage over 10 minutes must not exceed 253 V. If the average over
10 minutes exceeds the threshold value of 253 V, the Sunny Mini
Central disconnects itself from the grid. Once the average over 10
minutes returns to a value of less than 253 V, the Sunny Mini Central
returns to "Working" mode. If voltage rise protection is not required
in the relevant grid area (outside Germany), it can be deactivated
by presetting the LDVtgC parameter. In this event, only the fast cutoff via the Uac-Max parameter intervenes.
AntiIsland-Ampl Amplification of the anti-islanding process
(deactivated for GER by setting AntiIsland-Ampl = 0)
AntiIsland-Freq Repetition rate of the anti-islanding process
(deactivated for GER by setting AntiIsland-Ampl = 0)
Betriebsart Operating mode of the Sunny Mini Central:
• MPP: Maximum Power Point
• Turbine Mode: operating mode for Sunny Mini Central at a
wind turbine
• UKonst: constant voltage mode
(nominal voltage is defined in "Usoll-Konst")
• IKonst: operating mode for test purposes
• Stopp: disconnection from grid, no operation
• Off Grid: operating mode of the Sunny Mini Central
in a stand-alone grid
Page 82 SMC50A_60A-IEN073320 Installation Guide
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Name Explanation
Control Current regulation switching. If the operating parameter "Control" is
set to "Auto", the inverter automatically chooses the optimal type of
current regulation. If the operating parameter "Control" is set to
"Grid", the inverter regulates on the grid side. If set to "Bridge", the
inverter regulates on the bridge side. This setting can be a corrective
measure in the event of difficult grid characteristics. Discuss the
alteration of this parameter with the SMA Serviceline.
Default Used for setting country-specific information.
• GER/VDE0126-1-1: country-specific parameter settings for
Germany in accordance with DIN VDE 0126-1-1
• SP/RD1663: country-specific parameter settings
for Spain
• AUS/AS4777: country-specific parameter settings
for Australia
• IT/DK5950: country-specific parameter settings
for Italy
• GB/G83: country-specific parameter settings
for Great Britain
• Other: parameter settings can be defined here for countries
where no predefined setting exists.
• Trimmed: If country-specific parameters have been changed,
"trimmed" is shown on the display.
• Off_Grid: Setting for inverters which are operated in a standalone grid. More detailed information can be found in the
Sunny Island manual.
dFac-Max Maximum "grid frequency change" before the grid monitoring
system disconnects the device from the grid.
dZac-Max Maximum "grid impedance change" before the grid monitoring
system disconnects the device from the grid.
E_Total Total energy yield of the inverter. This change may be necessary
when you exchange your Sunny Mini Central and want to use the
data from the old device.
Fac-delta- Maximum frequency, above (Fac-delta+) and below (Fac-delta-) the
Fac-delta+
grid frequency, before the grid monitoring system disconnects the
device from the grid.
Fac-Limit delta For setting the frequency-dependent output derating in the operating
mode "Off Grid". Further information on this topic can be found in
the Sunny Island operating manual.
Installation Guide SMC50A_60A-IEN073320 Page 83
Technical Data SMA Technologie AG
Name Explanation
Fac-Pderating Frequency-dependent output limitation.
Fac-Start delta For setting the frequency-dependent output derating in the operating
mode "Off Grid". Further information on this topic can be found in
the Sunny Island operating manual.
Fac-Tavg Averaging time of grid frequency measurement.
Fan-Test By setting the "Fan-Test" parameter to "1" you can check
functionality of the fan.
Hardware-BFS Hardware version of the operation control unit (BFR)
h_Total Total hours of operation for the inverter. This change may be
necessary when you exchange your Sunny Mini Central and want
to use the data from the old device.
I-NiTest Setting the impulse for impedance monitoring.
This parameter only functions when the Sunny Mini Central is
deactivated (disconnected on the AC side) or in "Stopp" mode.
Inst.-Code Parameters for grid monitoring can only be changed after entering
the SMA grid guard password.
KI-Wind-Reg Control factors in Turbine mode. Further information on this topic can
KP-Wind-Reg
be found in the Windy Boy instruction manuals.
LDVtgC Compensation for the voltage drop in the cabling.
With this parameter, the voltage drop between the inverter and the
grid connection point is taken into account. The 10-minute average
voltage at the inverter connection must not exceed the sum of
ACVtgRPro plus LDVtgC. The parameter LDVtgC is preset to 0 V for
Germany. In grid areas in which the additional voltage rise
protection (see parameter ACVtgRPro) is not required, the
parameter LDVtgC is preset to 50 V. Thus, the voltage rise protection
is deactivated for these grid areas (253 V + 50 V = 303 V) and only
the fast cut-off via the Uac-Max parameter intervenes.
Plimit Upper limit for AC output power.
Pmax Output limitation of the inverter.
P-Wind-Mid Parameters for adjusting the inverter in Turbine mode. Further
P-Wind-Ramp
information on this topic can be found in the Windy Boy instruction
manuals.
Page 84 SMC50A_60A-IEN073320 Installation Guide
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Name Explanation
Ripple-Ctl-Frq The Ripple-Ctl-Frq, Ripple-Ctl-Lev, Ripple-Ctl-Rcvr parameters are
Ripple-Ctl-Lev
Ripple-Ctl-Rcvr
intended to handle ripple control signals from the Sunny Mini
Centrals. These parameters are not available for all Sunny Mini
Centrals. These parameters may only be changed after prior
agreement with SMA Technologie AG.
SMA-SN Serial number of the Sunny Mini Central.
Software-BFR Firmware version of the operation control unit (BFR).
Software-SRR Firmware version of the current control unit (SRR).
Speicherfkt. • Default Parameter: returns all parameters to the factory
settings.
• Reset Betriebsdaten: returns all user level parameters to the
factory settings.
• Reset Fehler: resets a permanent error.
Speicher/
Storage
• Permanent: modified parameters are stored in the EEPROM
and can be used even when the Sunny Mini Central has been
restarted.
• Volatil: prevents the parameters being stored in the EEPROM,
the parameters are only stored until the next restart.
T-Max-Fan Temperature for the maximum fan speed.
T-Start The period the Sunny Mini Central waits after the Upv-Start value
has been reached.
T-Start-Fan The fan starts to run at minimum speed at this temperature.
T-Stop The period the Sunny Mini Central waits before disconnecting from
the grid when Upv drops below the grid peak voltage.
T-Stop-Fan If after a temperature increase the inverter cools down to below this
threshold value, the fan switches itself off again.
Uac-Max Lower (Uac-Min) and upper (Uac-Max) limits of the allowable AC
Uac-Min
voltage (stand-alone grid recognition), before the grid monitoring
system disconnects the device from the grid.
Uac-Tavg Averaging time for measuring grid frequency.
Udc-WindMax Parameters for adjusting the inverter in Turbine mode. Further
Udc-WindMid
information on this topic can be found in the Windy Boy instruction
manuals.
Udc-WindStart
Upv-Start The DC voltage required before the Sunny Mini Central begins
feeding power into the grid.
Installation Guide SMC50A_60A-IEN073320 Page 85
Technical Data SMA Technologie AG
Name Explanation
Usoll-Konst PV desired voltage for constant operational voltage. These
parameters are only important when the "Betriebsart" parameter is
set to U-konst.
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14.4.2 Parameter Settings for Germany
Grayed out parameters are only displayed in installer mode. The table below contains
the parameters that are applicable in Germany.
Name Short
Value range Default setting
descr.
SMC 5000A SMC 6000A
ACVtgRPro V 230 ... 300 253 253
AntiIsland-
grd 0 ... 10 0 0
Ampl *
AntiIsland-
mHz 0.1 ... 2000 500 500
Freq *
Betriebsart MPP, Ikonst, Stop,
MPP MPP
Turbine Mode,
U-konst, Off_grid
Control Auto, Grid,
Auto Auto
Bridge
Default * GER/VDE0126-1-1,
GER/VDE0126-1-1 GER/VDE0126-1-1
GB/G83,
AUS/AS4777,
USA/UL1741,
IT/DK5950,
Off_Grid,
SP/RD1663,
Other, trimmed
dFac-MAX * Hz/s 0.1 ... 4.0 4 4
dZac-MAX * mOhm 0.35 ... 20000 685 670
E_Total kWh 0 ... 200000 0 0
Fac-delta- * Hz 0.1 ... 4.5 2.45 2.45
Fac-delta+ * Hz 0.1 ... 4.5 0.19 0.19
Fac-Limit delta Hz 0 ... 5 2 2
Fac-Start delta Hz 0 ... 5 1 1
Fan test 0 ... 1 0 0
h_Total h 0 ... 200000 0 0
Inst.-Code
I-NiTest * mA 0 ... 25000 160 0 0 16000
Installation Guide SMC50A_60A-IEN073320 Page 87
Technical Data SMA Technologie AG
Name Short
Value range Default setting
descr.
SMC 5000A SMC 6000A
LDVtgC V 0 ... 50 0 0
Pmax W 0 ... 6050 5500 6000
P-Wind-Mid W 0 ... 6000 2000 2000
P-Wind-Ramp W/s 10 ... 2000 1000 1000
Ripple-Ctl-Frq Hz 105 ... 1605 1605 1605
Ripple-Ctl-Lev % 0.5 ... 8 8 8
Ripple-Ctl-Rcvr disable, enable,
disable disable
auto
Riso-min kOhm 0 ... 10000 1000 1000
Speicherfkt. no function no function
Storage /
permanent, volatile permanent permanent
Speicher
T-Max-Fan grdC 0 ... 110 90 90
T-Start * s 5 ... 1600 10 10
T-Start-Fan grdC 0 ... 110 70 70
T-Stop s 1 ... 3600 2 2
T-Stop-Fan grdC 0 ... 110 50 50
Uac-Max * V 230 ... 300 260 260
Uac-Min * V 160 ... 230 198 198
Udc-
V 1 ... 600 450 540
WindMax
Udc-WindMid V 1 ... 600 315 450
Udc-
V 1 ... 600 200 250
WindStart
Upv-Start V 250 ... 600 300 300
Usoll-Konst V 250 ... 600 600 600
Page 88 SMC50A_60A-IEN073320 Installation Guide
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Parameters designated with * are safety-related grid monitoring parameters. To
change the SMA grid guard parameters, you must enter your personal SMA grid
guard password (Inst.-Code). Call the SMA Serviceline to obtain your personal
SMA grid guard password.
14.4.3 Country-specific Parameter Settings
You can see the default settings of the Sunny Mini Central on the name plate (see
section 4.1 "Identification" (Page 12)).
Sunny Mini Central SMC 5000A
The parameters listed below represent country-specific settings and are only displayed
in installer mode. All other parameters are international and can be viewed in the table
in section 14.4.2.
Name Short
Country settings
descr.
Germany Australia Great
Italy Spain
Britain
ACVtgRPro V 253 253 253 253 253
Default GER/
VDE0126-1-1
AUS/
AS4777
GB/
G83
IT/
DK5950
SP/
RD1663
dFac-Max Hz/s 4 0,25 0.2 0.20 2
dZac-Max mOhm 685 20000 350 350 350
Fac-delta- Hz 2,45 0,19 0.5 0.29 0.98
Fac-delta+ Hz 0,19 0,19 0.5 0.29 0.98
I-Ni-Test mA 16000 8000 0 0 0
LDVtgC V 0 50 50 50 50
T-Start s 10 45 180 10 10
Uac-Min V 198 205 209 198 199
Uac-Max V 260 265 261 262 250
Installation Guide SMC50A_60A-IEN073320 Page 89
Technical Data SMA Technologie AG
Sunny Mini Central SMC 6000A
The parameters listed below represent country-specific settings and are only displayed
in installer mode. All other parameters are international and can be viewed in the table
in section 14.4.2.
Name Short
Country settings
descr.
Germany Australia Great
Italy Spain
Britain
ACVtgRPro V 253 253 253 253 253
Default GER/
VDE0126-1-1
AUS/
AS4777
GB/
G83
IT/
DK5950
SP/
RD1663
dFac-Max Hz/s 4 0.25 0.2 0.20 2
dZac-Max mOhm 670 20000 350 350 350
Fac-delta- Hz 2,45 0,19 0.5 0.29 0.98
Fac-delta+ Hz 0,19 0,19 0.5 0.29 0.98
I-Ni-Test mA 16 0 00 8000 0 0 0
LDVtgCV0 5005050
T-Start s 10 45 180 10 10
Uac-Min V 198 205 209 198 199
Uac-Max V 260 265 261 262 250
Page 90 SMC50A_60A-IEN073320 Installation Guide
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14.4.4 Fixed Parameters
Grayed out parameters are only displayed in installer mode. The following parameters
are displayed in the parameter list but cannot be changed:
Name Short
descr.
SMC 5000A SMC 6000A
Fac-Pderating
Fac-Tavg ms 160 160
Hardware-BFS
Plimit W 5500 6000
SMA-SN
Software-BFR
Software-SRR
Uac-Tavg ms 80 80
Default setting
Installation Guide SMC50A_60A-IEN073320 Page 91
Contact SMA Technologie AG
15 Contact
If you have any questions or technical problems concerning the Sunny Mini Central,
contact our hotline. Please have the following information available when you contact
SMA:
• Inverter type
• Serial number of the Sunny Mini Central.
• Type and number of modules connected
• Communication method
• Blink code or display of the Sunny Mini Central
Address:
SMA Technologie AG
Hannoversche Strasse 1 - 5
34266 Niestetal
Germany
Tel.:+49 (561) 95 22 - 499
Fax:+49 (561) 95 22 - 4699
seviceline@SMA.de
www.SMA.de
Page 92 SMC50A_60A-IEN073320 Installation Guide
SMA Technologie AG Contact
Installation Guide SMC50A_60A-IEN073320 Page 93
Legal Restrictions SMA Tec hnologie AG
The information contained in this document is the property of SMA Technologie AG. Publishing its content,
either partially or in full, requires the written permision of SMA Technologie AG. Any internal company
copying of the document for the purposes of evaluating the product or its correct implementation is allowed
and does not require permission.
Exclusion of liability
The general terms and conditions of delivery of SMA Technologie AG shall apply.
The content of these documents is continually checked and amended, where necessary. However,
discrepancies cannot be excluded. No guarantee is made for the completeness of these documents. The latest
version is available on the Internet at www.SMA.de or from the usual sales channels.
Guarantee or liability claims for damages of any kind are exlcuded if they are caused by one or more of the
following:
• Improper or inappropriate use of the product
• Operating the product in an unintended environment
• Operating the product whilst ignoring relevant, statutory safety regulations in the deployment location
• Ignoring safety warnings and instructions contained in all documents relevant to the product
• Operating the product under incorrect safety or protection conditions
• Altering the product or supplied software without authority
• The product malfunctions due to operating attached or neighboring devices beyond statutory limit values
• In case of unforeseen calamity or force majeure
Software licensing
The use of supplied software produced by SMA Technologie AG is subject to the following conditions:
This software may be copied for internal company purposes and may be installed on any number of
computers. Supplied source codes may be changed or adapted for internal company purposes on your own
responsibility. Drivers may also be transferred to other operating systems. Source codes may only be published
with the written permission of SMA Technologie AG. Sub-licensing of software is not permissible.
Limitation of liability: SMA Technologie AG rejects any liability for direct or indirect damages arising from the
use of software developed by SMA Technologie AG. This also applies to the provision or non-provision of
support activities.
Supplied software not developed by SMA Technologie AG is subject to the respective licensing and liability
agreements of the manufacturer.
Trademarks
All trademarks are recognized even if these are not marked separately. Missing designations do not mean that
a product or brand is not a registered trademark.
SMA Technologie AG
Hannoversche Straße 1-5
34266 Niestetal
Germany
Tel. +49 561 9522-0
Fax +49 561 9522-100
www.SMA.de
E-mail: info@SMA.de
© 2007 SMA Technologie AG. All rights reserved.
Page 94 SMC50A_60A-IEN073320 Installation Guide
www.SMA.de
Sales
Solar Technology
SMA Technologie AG
Hannoversche Strasse 1–5
34266 Niestetal, Germany
Tel. : +49 561 9522 4000
Fax: +49 561 9522 4040
E-mail: sales@SMA.de
Freecall: +800 SUNNYBOY
Freecall: +800 78669269
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