SMA SC 200 Installation
Central Inverter
SUNNY CENTRAL 200 / 250 / 250HE / 350
Installation Guide
SC20_25_35-IEN094521 | 98-4004821 | Version 2.1
EN
SMA Solar Technology AG Table of Contents
Table of Contents
1 Notes on this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Scope of Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Appropriate Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2.1 Personnel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.2.2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.3 Special Hazards of Photovoltaic Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.4 Working on the Sunny Central . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.5 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Scope of Delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Standard Scope of Delivery
Sunny Central 200 / 250 / 250HE . . . . . . . . . . . . . . . . . . . . 13
3.2 Standard Scope of Delivery Sunny Central 350 . . . . . . . . . . . 15
3.3 Identifying the Sunny Central . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3.1 Check for transport damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Installation site requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Electrical Service Room. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.1 Minimum Passage Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.2 Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.4 Transport Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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Table of Contents SMA Solar Technology AG
4.4.1 Transporting the Sunny Central using a Lifting Cart or Forklift . . . . . . . . . . . 25
4.4.2 Transporting the Sunny Central using a Crane . . . . . . . . . . . . . . . . . . . . . . . 26
4.5 Assembly at the Installation Site . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5.1 Connecting Switch Cabinets to one Another . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5.2 Removing the Transport Locks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5 Internal Electrical Connections . . . . . . . . . . . . . . . . . . . . . 30
5.1 Preparatory Work for the Sunny Central 200 / 250 with
the "Protection against Chemically Active Substances" Option 30
5.2 Connecting the Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2.1 Sunny Central 200 / 250 / 250HE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2.2 Sunny Central 350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.3 Sunny Central 200 / 250 with the "Protection against chemically active
substances" option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3 Connecting the PE Connection . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.3.1 Sunny Central 200 / 250 / 250HE and 350 . . . . . . . . . . . . . . . . . . . . . . . 40
5.3.2 Sunny Central 200 / 250 with the "Protection against chemically active
substances" option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.4 Connecting the Control Lines on the Transfer Terminal Strip. . . 42
5.5 Connecting the Sunny Central Control to the Power Unit. . . . . 43
5.6 Connecting the Internal Control Lines . . . . . . . . . . . . . . . . . . . . 44
5.7 Connecting Insulation Monitoring (optional) . . . . . . . . . . . . . . 45
5.8 Installing the Internal Temperature Sensor . . . . . . . . . . . . . . . . 46
5.9 Sunny Central in Team Connection (optional) . . . . . . . . . . . . . 47
5.9.1 Connecting the Team Cable to
Sunny Central 200 / 250 / 250HE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.9.2 Connecting Team Cables for Sunny Central 200 / 250 with the
"Protection against Chemically Active Substances" Option . . . . . . . . . . . . . 48
5.9.3 Team Cables for Sunny Central 350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.10 Connecting the EVR Resistor (optional). . . . . . . . . . . . . . . . . . . 50
6 External Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
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SMA Solar Technology AG Table of Contents
6.1 Removing the Sliding Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.2 Connecting the AC Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.2.1 Connecting the AC Cable to the Sunny Central 200 / 250 . . . . . . . . . . . . 53
6.2.2 Connecting the AC Cable to the Sunny Central 350 . . . . . . . . . . . . . . . . . . 54
6.2.3 Connecting the AC Cable to the Sunny Central 250HE. . . . . . . . . . . . . . . . 55
6.3 Connecting the External PE Connection
(Sunny Central 250HE only) . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.4 Connecting the Internal AC Power Supply . . . . . . . . . . . . . . . . 58
6.4.1 Connecting the External Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.4.2 Connecting the Internal Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.5 Connecting the DC Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.5.1 Sunny Central 200 / 250 / 250HE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.5.2 Sunny Central 350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.6 Connecting the Team Cable (optional). . . . . . . . . . . . . . . . . . . 64
6.7 Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.7.1 Analog Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.7.2 External Signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.7.3 Overview of the Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.7.4 Handling Notes for Shielded Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.8 Remote Deactivation Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.9 Connecting the Communication . . . . . . . . . . . . . . . . . . . . . . . . 68
6.9.1 NET Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
6.9.2 RS485 data line for communication with Sunny String- Monitors. . . . . . . . . 69
6.9.3 Serial Interfaces for Team Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.10 Connecting the Emergency Shut-off . . . . . . . . . . . . . . . . . . . . . 71
6.11 Fitting the Sliding Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
7.1 Checking the Sunny Central Cabling . . . . . . . . . . . . . . . . . . . . 74
7.1.1 Checking the Connection of the Serial Interfaces . . . . . . . . . . . . . . . . . . . . . 75
7.1.2 Checking the Emergency Shut-Off Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . 75
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Table of Contents SMA Solar Technology AG
7.1.3 Checking the Thermostat and Hygrostat Settings . . . . . . . . . . . . . . . . . . . . . 76
7.2 Checking the Voltages on the Sunny Central . . . . . . . . . . . . . . 76
7.3 Preparation for Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . 78
7.4 Switching On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.1 Sunny Central 200 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2 Sunny Central 250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.3 Sunny Central 250HE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
8.4 Sunny Central 350 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
9 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
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SMA Solar Technology AG Notes on this Manual
1 Notes on this Manual
1.1 Scope of Validity
This manual describes the transport, installation and commissioning of SMA central inverters of the
following types:
• Sunny Central 200 (SC 200)
• Sunny Central 250 (SC 250) with the "Protection against chemically active substances" option
• Sunny Central 250 (SC 250)
• Sunny Central 250 (SC 250) with the "Protection against chemically active substances" option
• Sunny Central 250HE (SC 250HE) with the "High Efficiency" option
• Sunny Central 350 (SC 350)
1.2 Target Group
This manual is intended for installers and operators of photovoltaic systems equipped with Sunny
Centrals.
1.3 Additional Information
Keep all manuals for the Sunny Central and for the installed components together with the system
documentation. They must be accessible at all times.
You will find further information on the Sunny Central in the download area of www.SMA.de/en.
Among other things, the download area contains the following items:
• Sunny Central Installation Requirements
• Sunny Central Certificates
• Additional information on other options (e.g. GFDI)
Installation Guide SC20_25_35-IEN094521 7
Notes on this Manual SMA Solar Technology AG
1.4 Symbols Used
The following types of safety instructions and general information appear in this document as
described below:
DANGER!
DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
WARNING!
WARNING indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
CAUTION!
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
NOTICE!
NOTICE indicates a situation that can result in property damage, if not avoided.
Information
Information provides tips that are valuable for the optimal installation and operation of
your product.
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SMA Solar Technology AG Safety
2 Safety
2.1 Appropriate Usage
Sunny Central is a central inverter. It feeds solar energy converted via photovoltaics from solar
modules into a low- or medium-voltage grid.
Principle of a grid-connected solar power system with a Sunny Central
A Photovoltaic generator B Sunny Central C Low voltage or medium
voltage grid
Sunny Central 200 / 250 / 350
Sunny Central 200 / 250 / 350 contains a low voltage transformer and feeds i nto low volt age grids.
Sunny Central 250HE
Sunny Central 250HE is a high-efficiency central inverter without its own low-voltage transformer. The
Sunny Central 250HE feed into the medium-voltage grid via a shared medium-voltage transformer.
2.2 Safety Instructions
Faults that affect or limit the safety of the device must be rectified immediately. Unauthorized
modifications and spare parts not recommended by SMA Solar Technology may cause fire, material
damage and electrical shock. Unauthorized personnel must not have access to the devices.
Si gns mus t al way s be att ach ed i n pr omi nen t po siti ons . Da mag ed s igns mus t be rep lace d im med iat ely .
2.2.1 Personnel
Only qualified personnel may work on the Sunny Central. “Qualified” means that the personnel must
have been trained for the activity performed.
The personnel must be familiar with the content of the installation guide and user manual in order to
commission and / or operate the Sunny Central. In particular, the safety ins tructions must be followed.
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Safety SMA Solar Technology AG
2.2.2 Installation
Observe the installation conditions for the Sunny Central (separate document). The describe what you
must bear in mind when installing the Sunny Central.
An electrical service room is ideal for installation of the Sunny Central, to achieve optimal noise and
fire protection.
The Sunny Central was designed for use in industrial environments in terms of the EMC thresholds
(EMC = Electromagnetic Compatibility).
Note the following points when installing the Sunny Central:
• The inlet and exhaust ventilation systems for the Sunny Central must be separate to any other
ventilation, in order to minimize smoke distribution in case of fire.
• A sufficient escape route must be guaranteed.
• The EMC specifications must be observed (see technical data).
Smoke detector
We recommend that you install smoke detectors in the service room to deactivate the
Sunny Central if smoke develops. Incorporate the smoke detector in the Emergency Stop
circuit.
2.2.3 Special Hazards of Photovoltaic Systems
Photovoltaic systems in particular have some special hazards. They are described below:
• An active power source is connected. Depending on the operating mode, there may be voltage
present from the photovoltaic generator and the Sunny Central. This is especially important to
note when disconnecting particular parts of the system
• As a result of the very high DC voltages, arcing may occur if fuses and plugs are used
incorrectly.
• The short circuit current of the photovoltaic generator is only slightly higher than the maximum
operating current and also depends on irradiation conditions. If a short-circuit occurs in the
system, the available fuses are not guaranteed to switch off.
• A highly complex generator array may be difficult to disconnect if a fault develops (e.g. short
circuit). We recommend additional external DC circuit breakers, which disconnect the inverter,
the main DC lines and the Sunny String-Monitors (DC switches are available as an option).
2.2.4 Working on the Sunny Central
Work may only be performed on the Sunny Central when it is disconnected. Observe the following
safety rules when working on the Sunny Central:
1. Disconnect
2. Ensure that the device cannot be reconnected
3. Ensure that no voltage is present in the system
4. Ground and short-circuit if necessary
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SMA Solar Technology AG Safety
5. If necessary cover or protect against accidental contact with any voltage-carrying components.
The individual safety rules are listed in greater detail below:
Disconnection (in the event of team connection: both team members must be
disconnected)
If the Sunny Central is running with team connection, disconnect both the team leader and the team
device. The following list shows which sources of voltage must be be disconnected:
1. Grid voltage for grid feeding (AC main switch)
2. Gri d vo lta ge fo r th e su ppl y the sys tem 's p owe r su pply (if the system draws its power supply from
external sources)
3. DC voltage from the photovoltaic generator
– Unplug the DC fuses to disconnect the photovoltaic generator. The DC fuses of the two poles
are behind the protective covers. Remove the protective covers to pull the DC fuses. Never
remove both covers simultaneously. After removing the fuses on one pole, attach the covers
again.
– Pull the DC input fuses only when the load is off to prevent dangerous arcing. Use a clip-on
ammeter to measure whether the DC input is off-load. The DC input fuses may only be
re mov ed w ith per son al s afe ty e qui pme nt a nd a fus e gr ip. The re a re t hre e wa ys t o di sco nne ct
the DC voltage from the photovoltaic generator:
– Pull the internal DC input fuse
– Pull the external DC input fuse (if a Sunny Main Box is used)
– Via an external circuit breaker (if available)
4. DC voltage for team connection (if team connection is used)
5. Additional external voltage (e.g. emergency shut-off)
Even deactivated Sunny Central units may contain voltages which are dangerous to the touch. After
deactivating the Sunny Central, wait at least 5 minutes until all capacitors are discharged before
starting to work on the Sunny Central.
When the DC fuses are inserted in the Sunny Central (on both team members if team connection is
used), there is a reverse voltage on the DC main and sub-distributors.
Disconnecting system parts without danger
We recommend additional DC circuit breakers for the Sunny Central, the main DC lines
and Sunny String-Monitors. DC circuit breakers allow system parts to be disconnected
without danger.
Ensure that the device cannot be reconnected
Ensure that the Sunny Central cannot be reactivated.
Ensure that no voltage is present in the system
Ensure that all internal and external sources of voltage are disconnected.
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Safety SMA Solar Technology AG
Ground and short-circuit the unit if necessary (not on the DC side)
Ground and short-circuit the AC side. The DC side does not have to be grounded.
If necessary, cover or shield any adjacent live components
Cover or shield all adjacent live parts to prevent accidental contact.
2.2.5 General Information
Overvoltage and lightning protection
The devices have internal overvoltage protection on the AC and DC sides. However, the desired
protection level can only be achieved if a lightning protection area concept exists for the installation
building as per DIN VDE 0185-4, i.e. lightning conductors or combined surge and lightning
conductors (not included in delivery) are available at, among other locations, the building’s entrance
(transfer lightning protection area LPZ 1).
The combined overvoltage and lightning protection for the analog inputs can be ordered as an
option.
Emergency Shut-off
In photovoltaic systems with more than one Sunny Central, or additional external emergency shut-off
switches, the emergency-shut off circuits must be connected to one another. Only one Sunny Central
may supply the emergency shut-off circuit with voltage. For further information on connecting external
emergency shut-off switches, see section 6.10”Connecting the Emergency Shut-off” (page71).
Ear Protection
The device fans and the power unit create elevated levels of operating noise. In addition to this, a
fault in the device can lead to very high sound levels. While in the service room, we recommend that
you wear ear protection.
Burns
Immediately after disconnecting the Sunny Central, depending on the operating conditions, certain
components can be very hot (e.g. fuses, transformer core, sine wave filter, heatsinks etc.).
When working on hot components, we recommend that you wear gloves.
Torque
The circuit diagram contains a torque list. It provides details on all relevant torques. Observe these
torques when tightening the individual threaded connections. You can also ask Sunny Central Service
what the respective torques are.
Fuse Grip
A fuse grip is supplied with the Sunny Central for removing and inserting the fuses when the power
supply is disconnected. Additional safety equipment is required if fuses are not removed or inserted
when the power supply is disconnected.
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SMA Solar Technology AG Scope of Delivery
3 Scope of Delivery
3.1 Standard Scope of Delivery Sunny Central 200 / 250 / 250HE
Position Number Name
A 1 DC- / inverter cabinet
B 1 AC cabinet
C1Document set
• Installation guide
• User manual
• Variant circuit diagram
• Commissioning report
D 1 Documentation of the optional insulation monitoring (Bender)
E1Fuse grip
F 2 Terminal profile 3 m
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Scope of Delivery SMA Solar Technology AG
Position Number Name
G 1 Switch cabinet installation set
• Vertical baying clamp
• Baying bracket TS corner
• Horizontal baying clamp
• Baying quick connector
H1 18 OBO cable clamp 16 – 22 mm
H2 1 OBO cable clamp 58 – 64 mm
H3 8 OBO cable clamp 28 – 34 mm
H4 16 OBO cable clamp 22 – 28 mm
I1 18 OBO clamping saddle
I2 1 OBO clamping saddle
I3 8 OBO clamping saddle
I4 16 OBO clamping saddle
K 10 Shield clamp 0-8mm
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SMA Solar Technology AG Scope of Delivery
3.2 Standard Scope of Delivery Sunny Central 350
Position Number Name
A 1 DC- / inverter cabinet
B 1 AC cabinet
C1Document set
• Installation guide
• User manual
• Variant circuit diagram
• Commissioning report
D 1 Documentation of the optional insulation monitoring (Bender)
E1Fuse grip
F 2 Terminal profile 3 m
G 1 Switch cabinet installation set
• Vertical baying clamp
• Angle bracket TS corner
• Horizontal baying clamp
• Baying quick connector
H1 6 OBO cable clamp 16 – 22 mm
H2 12 OBO cable clamp 28 – 34 mm
H3 24 OBO cable clamp 22 – 28 mm
I1 6 OBO clamping saddle
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Scope of Delivery SMA Solar Technology AG
Position Number Name
I2 12 OBO clamping saddle
I3 24 OBO clamping saddle
K1 5 Shield clamp 0-8mm
K2 4 Shield clamp 19 mm
3.3 Identifying the Sunny Central
You can identify the Sunny Central using the type label. The type label is located on the inside of the
door of the Sunny Central.
The serial number (A) is printed on the type label and on the front side of the Sunny Central.
3.3.1 Check for transport damage
Ch eck the dev ice pac kag ing and t he S unn y Ce ntr al f or a ny po ssi ble damage and compare the scope
of delivery with the delivery documentation. In the case of damage to the device or unclear delivery
contents, immediately contact SMA Solar Technology.
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SMA Solar Technology AG Scope of Delivery
3.3.2 Storage
The transport packaging provides sufficient protection against moisture and damage when
transporting the Sunny Central.
Notice!
Penetrating moisture can damage the Sunny Central.
• The storage condition requirements are the same as the conditions for operating the
Sunny Central.
• Storing the Sunny Mini Central in packaging.
• Avoid extended storage.
• If stored for an extended period, remove moisture and soiling.
• Before commissioning, contact Sunny Central Service if the storage period is longer
than one year.
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Installation SMA Solar Technology AG
4 Installation
This section describes the transport options for the Sunny Central and the requirements of the
installation site.
Different transport and installation conditions apply to each Sunny Central. They are available in the
SMA Solar Technology download area.
Identifying cabinet units
The Sunny Central consists of 2 switch cabinets. If multiple Sunny Central units are
delivered, only install switch cabinets with the same serial number together.
4.1 Installation site requirements
Floor
The floor must guarantee solid and safe positioning of the Sunny Central. The floor must provide the
load-carrying capacity necessary to cope with the weight of the Sunny Central. Do not install the
Sunny Central on a slope. Level any unevenness in the floor.
Wall Clearances
When installing the Sunny Central, comply with the corresponding wall clearances for minimum
passages, escape routes and ventilation. The "Sunny Central Installation Requirements" (separate
document) contain the respective minimum clearances.
Inverter Protection Rating / EMC / Sound Levels
The Sunny Central is suitable for installation in dry areas with low dust levels. The Sunny Central was
designed for use in industrial environments in terms of the EMC thresholds (EMC = Electromagnetic
Compatibility) and sound levels.
4.2 Electrical Service Room
When installing and connecting the Sunny Central central inverter, observe the requirements for
electrical operating rooms, installing high-voltage current plants up to 1000 V, and the requirements
for passage widths and escape routes.
4.2.1 Minimum Passage Width
Note the following points for the escape routes in electrical service rooms:
• When the switch cabinet door is opened as far as possible, a minimum passage of 500 mm
(escape route) must remain.
• I n or der to c omp ly w ith the m ini mum pas sag e wi dth , if two swit ch cabinets are installed opposite
one another (e.g. in a station building), only one of the switch cabinets may be opened.
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4.2.2 Design
The following illustration is a schematic of the layout of an electrical service room with a
Sunny Central 250HE.
4.3 Ventilation
An incoming air supply is required to cool the Sunny Central. In order to guarantee safe operation
and the maximum of feed-in power, the permitted ambient temperature must be observed.
The required air is drawn through the switch cabinet doors and is blown out via the top or the rear
wall of the cabinet unit depending on the Sunny Central model. This means that the devices can be
installed right next to one another. See the "Sunny Central Installation Requirements" (separate
document) for the air requirements as well as appropriate wall clearances. Filters are installed at the
air inlet openings. They clean the inlet air.
If the volu me of air at the installat ion sit e of the Sun ny Cent ral is insufficient, then on-site measures must
be taken to provide greater quantities of air (ventilation grilles, blowers, fans, etc.).
The inlet air must satisfy the requirements of classification 3S2. If a Sunny Central is used in a
chemically-active environment, the inlet air must satisfy the requirements of classification 3C1.
The central inverter can be operated in relative humidity from 15 ... 95 %.
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Installation SMA Solar Technology AG
The heat generated by the Sunny Central (exhaust air) must be dissipated to comply with the
maximum permitted ambient temperature. We recommend routing the exhau st air ( air duc t) out o f the
electrical service room.
Overview of the Air Inlets and Outlets
The positions of the air outlets differ depending on the Sunny Central model selected. During
installation, ensure that the air inlets and outlets are not covered.
Air Routing for the "EVR" Option
If the "EVR" option was selected, the exhaust air cannot be routed through the top of the
Sunny Central.
NOTICE!
Overheating impairs the operation of the Sunny Central.
Ensure that the Sunny Central is sufficiently cooled:
• Provide the required air volume for the Sunny Central.
• Clean the ventilation openings (filter pads) and the exhaust air bars at regular
intervals. See the Sunny Central maintenance manual for the exact cleaning intervals.
• Route the exhaust air separately from the individual cabinet units (air outlets of the
power units and the switch cabinet) to prevent thermal short circuits.
If routing the exhaust air through the rear wall of the Sunny Central, the exhaust air can be routed
directly out of the building via a weatherproof grille installed on-site in the building wall. The Sunny
Central can then be set up with the rear of the cabinet directly against the opening in the building
wall. Remove the finger guard from the fan openings and secure a seal or frame-like air hood to the
building wall.
DANGER!
Loss of limbs!
If the exhaust air is routed directly out of the building, the rotor blades of the fan are not
protected against contact.
• When cleaning the ventilation duct, switch off the Sunny Central.
• Do not start to clean the ventilation duct until the rotor blades of the fan have come
to a stop.
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SMA Solar Technology AG Installation
The following illustrations show examples of where the individual air inlets and outlets are located.
Sunny Central 200 air inlets
Sunny Central 200 air outlets
The position of the air outlets of the Sunny Central 200 depends on the variant. Depending on the
variant, the air outlets are on the rear or in the top of the Sunny Central.
Air outlets on the rear Air outlets in the top
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Installation SMA Solar Technology AG
Sunny Central 250 air inlets
Sunny Central 250 air outlets
The position of the air outlets of the Sunny Central 250 depends on the variant. Depending on the
variant, the air outlets are on the rear or in the top of the Sunny Central.
Air outlets on the rear Air outlets in the top
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SMA Solar Technology AG Installation
Sunny Central 250HE air inlets
Sunny Central 250HE air outlets
The position of the air outlets of the Sunny Central 250HE depends on the variant. Depending on the
variant, the air outlets are on the rear or in the top of the Sunny Central.
Air outlets on the rear Air outlets in the top
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Installation SMA Solar Technology AG
Sunny Central 350 air inlets and outlets
Supply air Exhaust air
4.4 Transport Options
Sunny Centrals can be transported with a forklift, lifting cart or a crane fork. They consist of two switch
cabinet units, the DC- / inverter cabinet and the AC cabinet.
WARNING!
Danger of crushing if the switch cabinet unit tips over!
The Sunny Central can tip over during
transport if the center of gravity is not in the
middle.
• Only transport switch cabinet units
upright.
• The center of gravity is indicated on the
packaging and on the Sunny Central.
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SMA Solar Technology AG Installation
4.4.1 Transporting the Sunny Central using a Lifting Cart or Forklift
1. Use a TX30 torque wrench to remove the front and
rear base covers.
2. Pick up the switch cabinet unit with the lifting cart or
forklift.
3. Transport the switch cabinet unit to the installation
site.
4. Reattach the front and rear base covers.
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Installation SMA Solar Technology AG
4.4.2 Transporting the Sunny Central using a Crane
1. Use a TX30 torque wrench to remove the front and
rear base covers.
2. Pick up the switch cabinet unit with the crane fork.
3. Transport the switch cabinet unit to the installation
site.
4. Reattach the front and rear base covers.
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SMA Solar Technology AG Installation
4.5 Assembly at the Installation Site
The Sunny Centrals have a high dead weight. Additional anchoring in the floor or in the wall is
unnecessary.
4.5.1 Connecting Switch Cabinets to one Another
Enclosed documentation of the switch cabinet manufacturer
Follow the instructions in the enclosed documentation of the switch cabinet manufacturer to
connect the two switch cabinets to one another. The assembly procedure is described
there.
If you are using a Sunny Central 200 / 250 with the "Protection ag ain st c hem ica lly act ive sub sta nce s"
option, the switch cabinets must be connected to one another as described below.
1. Attach the included sealing material all around the cabinet frame of the AC cabinet.
A Seal material
2. Install the switch units at the installation site.
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Installation SMA Solar Technology AG
3. Connect the switch cabinet units at positions A and B with the provided bolts, washers, locking
washers and brackets. Follow the instructions in the enclosed Rittal documentation. The diagram
below shows Sunny Central 250 with the "Protection against chemically active substances"
option.
☑ The switch cabinet units are connected to each other.
28 SC20_25_35-IEN094521 Installation Guide
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