The information contained in this document is the property of SMA Solar Technology AG. Publishing its content, either
partially or in full, requires the written permission of SMA Solar Technology 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.
SMA Warranty
You can download the current warranty conditions from the Internet at www.SMA-Solar.com.
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SMA Solar Technology AG1 Information on this Document
1 Information on this Document
1.1 Validity
This document is valid for the following device types:
• SI3.0M-11 (Sunny Island 3.0M) from firmware version 3.2
• SI4.4M-11 (Sunny Island 4.4M) from firmware version 3.2
• SI6.0H-11 (Sunny Island 6.0H) from firmware version 3.1
• SI8.0H-11 (Sunny Island 8.0H) from firmware version 3.1
1.2 Target Group
The activities described in this document may only be performed by qualified persons. Qualified persons must have the
following skills:
• Training in how to deal with the dangers and risks associated with installing and using electrical devices and batteries
• Training in the installation and commissioning of electrical devices
• Knowledge of and adherence to the local standards and directives
• Knowledge of and compliance with this document and all safety information
1.3 Additional Information
Additional information is available at www.SMA-Solar.com:
Document titleDocument type
Mounting on Wood BaseTechnical Information
Battery Management in Off-Grid SystemsTechnology Brochure 6
Battery ManagementTechnical Information
Grounding in Off-Grid SystemsTechnical Information
External Energy SourcesTechnical Information
PV InvertersTechnical Information
SMA Flexible Storage System With Battery Backup
Function
SMA Smart HomePlanning Guidelines
Planning Guidelines
Installation ManualSI30M-44M-60H-80H-IA-en-307
1 Information on this DocumentSMA Solar Technology AG
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1.4 Symbols
SymbolExplanation
Indicates a hazardous situation which, if not avoided, will result in death or serious injury
Indicates a hazardous situation which, if not avoided, can result in death or serious injury
Indicates a hazardous situation which, if not avoided, can result in minor or moderate injury
Indicates a situation which, if not avoided, can result in property damage
Section that is relevant for SMA Flexible Storage Systems only
Section that is relevant for off-grid systems only
Information that is important for a specific topic or goal, but is not safety-relevant
☐Indicates a requirement for meeting a specific goal
☑Desired result
✖A problem that might occur
1.5 Typographies
TypographyUseExample
bold• Display messages
• Parameters
• Connections
•Fuse holders
• Elements to be selected
• Elements to be entered
>• Several elements that are to be
selected
• Connect the grounding conductor to
AC 2Gen/Grid.
• Select the parameter 235.01 GnAutoEna
and set to Off.
•Select 600# Direct Access > Select
Number.
1.6 Nomenclature
Complete designationDesignation in this document
Off-grid system, battery backup system, system for
increased self-consumption
System
Sunny Boy, Sunny Mini Central, Sunny TripowerPV inverters
Menus are presented as follows: menu number, hash, and menu name (e.g. 150# Compact Meters).
Parameters are presented as follows: menu number, period, parameter number, and parameter name (e.g. 150.01
GdRmgTm). The term parameter includes parameters with configurable values as well as parameters for displaying
values.
8SI30M-44M-60H-80H-IA-en-30Installation Manual
SMA Solar Technology AG2 Safety
2 Safety
2.1 Intended Use
The Sunny Island is a battery inverter which controls the electrical energy balance in an off-grid system, in a battery
backup system, or in a system for increased self-consumption. In a battery backup system, you can also use the
Sunny Island for increased self-consumption.
The Sunny Island is suitable for use indoors and in weather-protected outdoor areas.
The grid configuration of the generator or the utility grid must be a TN or TT system. Cables with copper wires must be
used for the installation.
Use this product only in accordance with the information provided in the enclosed documentation and with the locally
applicable standards and directives. Any other application may cause personal injury or property damage.
Device types SI3.0M-11 and SI4.4M-11 do not support all off-grid system variants. Only device types SI6.0H-11 and
SI8.0H-11 are suitable for single-phase single cluster systems and three-phase multicluster systems (see the Quick
Reference Guide "Off-Grid Systems").
The Sunny Island is not suitable for supplying life-sustaining medical devices. A power outage must not lead to personal
injury.
AC sources (such as PV inverters) can be used in off-grid systems and battery backup systems for energy supply. Too
much power from the AC sources in the stand-alone grid or with battery backup systems in a battery backup grid can
lead to system failures. The maximum output power of the AC sources must be observed in off-grid systems and battery
backup systems (see Section10 "Technical Data", page94). The powers of the individual Sunny Island inverters are
added to yield the total maximum power.
The Sunny Island uses batteries for the storage of energy. The nominal voltage of the battery must correspond to the input
voltage on the DC connection. A fuse switch-disconnector (e.g. BatFuse) must be installed between the battery and the
Sunny Island. The battery room must be ventilated in compliance with the requirements of the battery manufacturer and
with the locally applicable standards and directives (see documentation of the battery manufacturer). If connecting a
lithium-ion battery, the following must be observed:
• The lithium-ion battery must comply with the locally applicable standards and directives and be intrinsically safe.
• Battery management of the lithium-ion battery must be compatible with the Sunny Island (see "Safety Information" in
the quick reference guide for the relevant system).
In off-grid systems with lead-acid batteries only, a maximum of four Sunny Island Charger charge controllers can be
connected per cluster. The battery management must record the DC current when charging and discharging the battery.
A battery current sensor may be installed to allow precise measurement of the battery current. The Sunny Island is not
suitable for establishing a DC distribution grid.
The Sunny Island can control various devices in the system (e.g. load-shedding contactors) via two multifunction relays.
The multifunction relays are not suitable for controlling functions which may endanger persons in the event of a
malfunction of the multifunction relays – for example, if there is insufficient redundancy in the ventilation of the battery
room.
Alterations to the product, e.g. modifications or conversions, are permitted only with the express written permission of
SMA Solar Technology AG. Unauthorized alterations will void guarantee and warranty claims and usually void the
operation permit. SMA Solar Technology AG shall not be held liable for any damage caused by such changes.
Any use of the product other than that described in the Intended Use section does not qualify as appropriate.
The enclosed documentation is an integral part of this product. Keep the documentation in a convenient place for future
reference and observe all instructions contained therein.
The type label must remain permanently attached to the product.
Installation ManualSI30M-44M-60H-80H-IA-en-309
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2.2 Safety Information
This section contains safety information that must be observed at all times when working on or with the product. To prevent
personal injury and property damage and to ensure long-term operation of the product, read this section carefully and
observe all safety information at all times.
Danger to life from electric shocks due to connected voltage and risk of injury from short-circuit currents
High voltages are present inside the Sunny Island inverter. When the enclosure lid is removed, live components can be
touched which can result in death or serious injury due to electric shock. Short-circuit currents in the battery can cause
heat build-up and electric arcs. Burns or eye injuries due to flashes may result.
• When carrying out any work on the electrical installation, wear suitable personal protective equipment.
• Turn off or disconnect the following devices from voltage sources in the given order:
–Sunny Island
– The circuit breakers of the Sunny Island inverter on the distribution board and the control and measurement
voltages
– Load-break switch of the battery
• Ensure that the system cannot be reconnected.
• Open the enclosure lid on the Sunny Island inverter and ensure that no voltage is present.
• Ground and short-circuit the AC conductors outside the Sunny Island inverter.
• Cover or isolate any adjacent live components.
Danger to life from electric shock due to damaged Sunny Island
Operating a damaged Sunny Island can lead to hazardous situations that can result in death or serious injuries due to
electric shock.
• Only operate the Sunny Island when it is technically faultless and in an operationally safe state.
• Check the Sunny Island for visible damage.
• Make sure that all external safety equipment is freely accessible at all times.
• Make sure that all safety equipment is in good working order.
Risk of crushing injuries due to movable generator parts
Moving parts in the generator can crush or sever body parts. A generator can be started automatically by the
Sunny Island.
• Only operate the generator with the safety equipment.
• Install, maintain, and operate the generator according to the manufacturer's specifications.
Risk of burns due to short-circuit currents on the disconnected Sunny Island
The capacitors at the DC connection input area store energy. After the battery is disconnected from the Sunny Island,
battery voltage remains temporarily on the DC connection. A short circuit at the DC connection can lead to burns and
may damage the Sunny Island inverter.
• Wait 15 minutes before performing any work at the DC connection or on the DC cables. This allows the capacitors
to discharge.
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Risk of burns due to hot components
Some components on the Sunny Island inverter may heat up significantly during operation. Touching these components
can cause burns.
• Touch only the enclosure lid of the Sunny Island inverter during operation.
• When the Sunny Island is open, do not touch hot surfaces.
Destruction of the Sunny Island inverter due to electrostatic discharge (ESD)
Touching the electronic components within the Sunny Island inverter can lead to damage to or destruction of the
Sunny Island.
• Do not touch any electronic assemblies.
• Ground yourself before touching any connections.
2.3 Information for Handling Batteries
Danger to life due to explosive gases
Explosive gases may escape from the battery and cause an explosion. This can result in death or serious injury.
• Protect the battery environment from open flames, embers, or sparks.
• Install, operate, and maintain the battery in accordance with the manufacturer's specifications.
• Do not heat the battery above the temperature permitted or burn the battery.
• Ensure that the battery room is sufficiently ventilated.
Chemical burns and poisoning due to battery electrolyte
If handled inappropriately, battery electrolyte can cause irritation to the eyes, respiratory system, and skin and it can
be toxic. This may result in blindness and serious chemical burns.
• Protect the battery enclosure against destruction.
• Do not open or deform the battery.
• Whenever working on the battery, wear suitable personal protective equipment such as rubber gloves, apron,
rubber boots, and goggles.
• Rinse acid splashes thoroughly with clear water and consult a doctor.
• Install, operate, maintain, and dispose of the battery according to the manufacturer's specifications.
Risk of injury due to short-circuit currents
Short-circuit currents in the battery can cause heat build-up and electric arcs. Burns or eye injuries due to flashes may
result.
• Remove watches, rings, and other metal objects.
• Use insulated tools.
• Do not place tools or metal parts on the battery.
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Risk of burns due to hot battery components
Improper battery connection may result in excessively high transition resistances. Excessive transition resistances give
rise to localized heat build-up. Heat build-up can cause burns.
• Ensure that all pole connectors are connected with the connecting torque specified by the battery manufacturer.
• Ensure that all DC cables are connected with the connecting torque specified by the battery manufacturer.
Permanent damage to the battery due to improper handling
Improper storage, transport, set-up, and maintenance of the battery can cause it to become permanently damaged.
Logs can help to determine the cause.
• Comply with all requirements of the battery manufacturer with regard to storage, transport, and mounting location.
• Check and log the status of the battery before commissioning and before performing maintenance work:
• Check the battery for visible damage and log.
• Measure and log the fill level and acid density of FLA batteries.
• In the case of lead-acid batteries, measure and log the voltages of the individual cells.
• Perform and log the test routines required by the battery manufacturer.
Tip: Many battery manufacturers provide suitable logs.
Damage to the battery due to incorrect settings
Incorrect settings lead to premature aging of the battery. The parameter settings in the menu 220# Battery,
222# Chargemode, 262# BatUsage and 223# Protection impact the charging behavior of the Sunny Island
inverter (see Section8.2 "Battery Management", page67).
• Check whether initial battery charging with special settings is required.
If an initial charge is required, adjust the charging behavior of the Sunny Island inverter for one-off initial charging
(see Section8.2.2, page67).
• Ensure that the values for the battery as recommended by the battery manufacturer are set in the menus
222# Chargemode (see Section8.2.2, page67), 262# BatUsage (see Section 8.2.3, page 68 and Section
8.2.4, page 69), and 223# Protection (see Section8.2.5, page75) (for the technical data of the battery see
the documentation provided by the battery manufacturer). Note that the charging behavior names used by
SMA Solar Technology AG and the battery manufacturer may, in some cases, differ in meaning (for the charging
behavior of the Sunny Island inverter, see the Technical Information "Battery Management"). Tip: For questions
relating to the settings of the Sunny Island inverter, please contact the SMA Service Line.
Prior damage to batteries
Batteries may have suffered prior damage due to production defects. Logs can help to determine the cause.
• Check and log the status of the battery before commissioning and before performing maintenance work:
Performance impairment of batteries
Transition resistances can impair the performance of the batteries.
• Note the torques when connecting the battery.
12SI30M-44M-60H-80H-IA-en-30Installation Manual
SMA Solar Technology AG3 Scope of Delivery
3 Scope of Delivery
Check the scope of delivery for completeness and any externally visible damage. Contact your distributor if the scope of
delivery is incomplete or damaged.
Figure1: Components included in the scope of delivery
F2Hexagon socket screw M8x20Y1Black data cable CAT5e, 2 m
G2 Fender washer M8Z 2 Silicon tube 10 mm x 500 mm
H2Spring washer M8a1Cable support sleeve for one
W1Filler plug M25
X1Putty in a separate accessory kit
cable
b2Cable support sleeve for two
cables
manual, three Quick Reference
Guides:
"SMA Flexible Storage System",
"SMA Flexible Storage System
with Battery Backup Function",
"Off-Grid Systems"
Q1Counter nut for M20 cable
gland
* 1 spare part for the enclosure lid included
Installation ManualSI30M-44M-60H-80H-IA-en-3013
d1Warning label
3 Scope of DeliverySMA Solar Technology AG
Communication for RS485 order option
Figure2: Components of the Communication for RS485 order option
PositionQuantityDesignation
A1SI-COMSMA.BGx, installed in the Sunny Island* ex works
B1Gray data cable CAT5e, 5 m
C1White data cable CAT5e with three wires with stripped insulation
D1Screw, installed in the Sunny Island ex works
E1Terminator, plugged into SI-COMSMA.BGx ex works
* In the case of a cluster system, the communication interface is only installed in the master.
Communication for multicluster system order option
Figure3: Components of the Communication for multicluster system order option
PositionQuantityDesignation
A1SI-SYSCAN.BGx* , installed in the master ex works
B1SI-COMSMA.BGx** , installed in the master ex works
C1Yellow data cable CAT5e, 5 m
D1Gray data cable CAT5e, 5 m
E1White data cable CAT5e with three wires with stripped insulation
F2Screw, installed in the Sunny Island ex works
G2Terminator, plugged into SI-SYSCAN.BGx and SI-COMSMA.BGx ex works
H1Cable support sleeve for 4 cables
* CAN communication interface
** RS485 communication interface
14SI30M-44M-60H-80H-IA-en-30Installation Manual
SMA Solar Technology AG4 Additional Tools Required
4 Additional Tools Required
ToolsExplanation
Drill‒
Drill bitMounting of the wall mounting bracket
Allen key, AF 5‒
Torque wrenchAttachment: AF 5
Measurement range: 4 Nm to 12 Nm
Crimping pliersCrimping of the DC cable terminal lugs
Crimping toolCrimping of the bootlace ferrules
Flat-blade screwdriverConnection of the control and measuring cables to the terminals
Current clampMeasuring of the battery current
Measuring device for voltage
measurement
Measuring of the AC voltages in the system and measuring of the battery
voltage
Installation ManualSI30M-44M-60H-80H-IA-en-3015
5 Product DescriptionSMA Solar Technology AG
5 Product Description
5.1 Sunny Island
The Sunny Island is a battery inverter which controls the electrical energy balance in an off-grid system, in a battery
backup system, or in a system for increased self-consumption. In a battery backup system, you can also use the
Sunny Island for increased self-consumption.
Figure4: Design of the Sunny Island inverter
PositionDesignation
AVentilation grid
BType label
CControl panel
DEnclosure lid
The Sunny Island supplies AC loads in the system from a battery or charges the battery with the energy provided by AC
sources (e.g. PV inverter). AC sources supply loads and are used by the Sunny Island to recharge the battery. In order
to be able to increase the availability of the off-grid system and reduce the battery capacity, the Sunny Island can use
and control a generator as an energy reserve.
The loads may temporarily overload the Sunny Island. If there is a short circuit, the Sunny Island briefly feeds short-circuit
currents into the utility grid. As a result, the Sunny Island may trip certain circuit breakers (see Section10 "Technical Data",
page94).
Type label
The type label clearly identifies the product. The type label is located on the right-hand side of the enclosure (for a
description of the type label, see the Sunny Island inverter operating manual).
You will require the information on the type label to use the product safely and when seeking customer support from the
SMA Service Line.
5.2 Scope of Functions of Device Types SI3.0M-11 and SI4.4M-11
The following functional restrictions apply for device types SI3.0M-11 and SI4.4M-11:
• All Sunny Island inverters in a cluster must be of the same device type.
• Device types SI3.0M-11 and SI4.4M-11 do not support all off-grid system variants. Single-phase systems can
include a maximum of one Sunny Island SI3.0M-11 or SI4.4M-11. Three-phase systems can include a maximum of
three Sunny Island SI3.0M-11 or SI4.4M-11.
Only device types SI6.0H-11 and SI8.0H-11 are suitable for single-phase single cluster systems and three-phase
multicluster systems (see the Quick Reference Guide "Off-Grid Systems").
16SI30M-44M-60H-80H-IA-en-30Installation Manual
SMA Solar Technology AG5 Product Description
5.3 Multifunction Relay
Using two multifunction relays, each Sunny Island can control various functions and can display operating states and
warning messages. In battery backup systems, master multifunction relays are set permanently to control the contactors
within the automatic transfer switch.
Possible function or
output
Controlling generatorsThe multifunction relay activates if a generator request is received from the Sunny Island
Control of the tie switch
and of the contactors for
grounding
Control of load-shedding
contactors
Time control for external
processes
Display of operating
states and warning
messages
Control of a battery-room
fan
Explanation
inverter's generator management. With the multifunction relay, you can control generators
equipped with electrical remote-start function or connect a signal generator for generators
with no autostart function (see Section 7.4.10 and 7.4.11).
In battery backup systems, the multifunction relays control the contactors for grid coupling
and grounding.
The multifunction relay is activated depending on the state of charge of the battery.
Depending on the configuration, you can install a one-level load shedding with one
multifunction relay or a two-level load shedding with two multifunction relays. You can also
adjust the thresholds for the state of charge of the battery depending on the time of day
(see Section 7.4.12).
The multifunction relays can be time-controlled (see Section 7.4.13).
Each multifunction relay can display either one event or one warning message
(see Section 7.4.14).
The multifunction relay is activated when the charging current leads to the battery emitting
gasses. A connected battery room fan is switched on for at least one hour (see Section
7.4.15).
Control of an electrolyte
pump
Use of excess energyIn off-grid systems during the constant voltage phase, a multifunction relay is activated and
Depending on the nominal energy throughput, the multifunction relay is activated at least
once a day (see Section 7.4.16).
thus controls additional loads that can put any excess energy to good use (see Section
7.4.17).
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5 Product DescriptionSMA Solar Technology AG
5.4 Communication
The Sunny Island is equipped with two interface slots for the connection of SMA communication interfaces.
Interface slot SICOMSMA
The interface slot SICOMSMA is for connecting the Speedwire data module SWDMSI-xx or the RS485 communication
interface SI-COMSMA.BGx.
The Speedwire data module SWDMSI-xx allows the Sunny Island inverter to be integrated into a Speedwire network.
Speedwire is a cable-based type of communication based on the Ethernet standard and the communication protocol
SMA Data2+. This enables inverter-optimized 10/100 Mbit data transmission between Speedwire devices, e.g.
between Sunny Island and Sunny Home Manager.
The SI-COMSMA.BGx communication interface allows the Sunny Island inverter to be integrated into an RS485
communication bus. You can connect the Sunny Island to the following products using RS485:
• SMA communication products (e.g. Sunny WebBox)
•PV inverters
• Wind power inverters
• Extension cluster masters
If the Sunny Island inverters are ordered with the RS485 communication interface SI-COMSMA.BGx or with the
Speedwire data module SWDMSI-xx, the Sunny Island inverters are delivered with premounted communication
interfaces.
Interface slot SISYSCAN
On Sunny Island device types SI6.0H-11 or SI8.0H-11, the interface slot SISYSCAN is for connecting the multicluster
data module SI-SYSCAN.BGx.
In a multicluster system, the masters of the clusters must communicate with each other via a separate CAN bus. An
SI-SYSCAN.BGx communication interface must be installed in each master for multicluster communication.
If the Sunny Island inverters are ordered with the communication interface SI-SYSCAN.BGx, the masters are delivered
with premounted communication interfaces.
18SI30M-44M-60H-80H-IA-en-30Installation Manual
SMA Solar Technology AG6 Mounting
6 Mounting
6.1 Requirements for Mounting
Mounting location:
☐ A stable, non-flammable support surface must be used at the mounting location, e.g. concrete or masonry. In the
living area, ensure that the support surface is not made of drywall or similar. When in operation, the Sunny Island
makes noises which can be perceived as annoying.
☐ The mounting location must be suitable for the weight and dimensions of the Sunny Island inverter (see Section10
"Technical Data", page94).
☐ The mounting location must be clear and safely accessible at all times without the need for any auxiliary equipment
(e.g. scaffolding or lifting platforms). Non-fulfillment of these criteria may restrict servicing.
☐ The mounting location must not hinder access to disconnection devices.
☐ The mounting location must not be exposed to direct solar irradiation. Direct solar irradiation can cause the
Sunny Island to overheat.
☐ Climatic conditions must be met (see Section10 "Technical Data", page94).
☐ The mounting location must be less than 3,000 m above MSL. From altitudes of 2,000 m above MSL, the power
decreases by 0.5% every 100 m.
☐ The ambient temperature should be below 40°C. This will ensure the optimum operation of the Sunny Island inverter
(see Section10.9 "Energy Consumption in No-Load Operation and Standby", page98).
Mounting position:
Figure5: Permissible and impermissible mounting positions
☐ The mounting location must be suitable for a permitted mounting position. The control panel should be at eye level.
This will make it easier to operate the buttons and view the LED signals.
Installation ManualSI30M-44M-60H-80H-IA-en-3019
6 MountingSMA Solar Technology AG
Clearances:
Figure6: Minimum clearances
☐ The mounting location must be suitable for mounting while observing minimum clearances to walls, other
Sunny Island units or other objects. This will allow for sufficient heat dissipation.
Multiple Sunny Island inverters installed in areas with high ambient temperatures
There must be sufficient clearance between the Sunny Island inverters to ensure that the cooling air of the
adjacent inverter is not drawn in.
• In order to guarantee sufficient cooling of the Sunny Island inverters, the clearances between the
Sunny Island units should be significantly greater than the minimum clearances.
• Ensure sufficient fresh-air supply.
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6.2 Mounting the Sunny Island
Danger to life due to fire or explosion
Care taken during design does not preclude the possibility of a fire developing in electrical devices. Contact with
flammable materials allows the fire to spread. This can result in death or serious injury.
• Do not mount the Sunny Island on flammable construction materials.
• Do not mount the Sunny Island near highly flammable materials.
• Do not mount the Sunny Island in potentially explosive atmospheres.
• Ensure that the battery room is sufficiently ventilated and that all other requirements for the installation location of
the battery are complied with (see battery manufacturer documentation). This will prevent the build-up of explosive
and dangerous gases.
Dimensions for wall mounting:
Figure7:Dimensions of the wall mounting bracket and dimensions of the drill holes for the optional anti-theft device on the Sunny Island inverter
Installation ManualSI30M-44M-60H-80H-IA-en-3021
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6 MountingSMA Solar Technology AG
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Sunny Island with order options "Communication for RS485" or "Multicluster System"
Any ordered communication interfaces are installed in the master ex works. The master can be identified by the
labeling on the packaging.
• For single-cluster systems and multicluster systems, mount the Sunny Island units with integrated communication
interfaces at the planned mounting locations for masters.
Additionally required mounting material (not included in the scope of delivery):
☐ At least two screws that are suitable for the support surface.
☐ At least two washers suitable for the screws.
☐ At least two screw anchors suitable for the support surface and the screws.
☐ If the inverter is to be secured against theft, two security screws that can only be unscrewed with a special tool.
Procedure:
1. At the mounting location, mark the position of the drill holes using the wall mounting bracket. Use at least one hole
on the right side of the wall mounting bracket and one on the left.
2. Ensure that there are no electric lines or other supply lines in the wall behind the marked positions.
3. Drill the holes and insert the screw anchors.
4. Secure the wall mounting bracket horizontally to the wall using screws and washers.
5. If the Sunny Island is to be secured against theft, mark the drill holes for the anti-theft device. Use at least one hole
on the right and one on the left.
6.
Risk of injury due to the heavy weight of the Sunny Island inverter
Improper transport and mounting can result in the Sunny Island falling. Falling may lead to bruising and broken
bones.
• Keep in mind the weight of the Sunny Island inverter (see Section10 "Technical Data", page94).
• With the SI3.0M-11 and SI4.4M-11, the Sunny Island should
be mounted to the wall mounting bracket. For this, use the side
recess grips. Keep the Sunny Island in a horizontal position
during transport.
• With the SI6.0H-11 and SI8.0H-11, the Sunny Island should
be mounted to the wall mounting bracket. For this, use the
side recess grips or a steel rod (diameter: maximum 30 mm).
Keep the Sunny Island in a horizontal position during
transport.
22SI30M-44M-60H-80H-IA-en-30Installation Manual
SMA Solar Technology AG6 Mounting
7. Use an Allen key (AF 5) to attach the Sunny Island to the wall
mounting bracket on both sides with the M6x10 screws provided
(torque: 4 Nm to 5.7 Nm). This will prevent the Sunny Island from
being lifted off the bracket.
8. Seal off the recess grips with the ventilation grids:
• Place the ventilation grid marked links/left on the left recess
grip.
• Place the ventilation grid marked rechts/right on the right
recess grip.
9. In order to protect the Sunny Island against theft, attach the bottom
side to the wall with two security screws.
10. Ensure that the Sunny Island is firmly attached.
Installation ManualSI30M-44M-60H-80H-IA-en-3023
7 Electrical ConnectionSMA Solar Technology AG
7 Electrical Connection
7.1 Content and Structure of the Section
The sub-sections differ in their structure. Some sub-sections refer to the correct connection of devices, others refer to basic
procedures.
An overview detailing which contents the sub-sections describe and which contents should be read and adhered to can
be found in the following table.
SectionExplanation
7.2 Connection AreaGraphic overview of the connection area
7.3 Connecting the Grounding Conductor
in Systems With Grounded Battery
7.4 Connecting the DevicesInformation on connection and circuitry of individual devices with
7.5 Connecting the CablesCorrect connection of the cables to the respective connections
7.6 Checking the WiringYou must read and observe the section for the connections used.
7.7 Sealing and Closing the Sunny IslandYou must read and observe this section.
7.8 Inserting the Fuse Links in the Fuse
Switch-Disconnector BatFuse
For systems with grounded battery, this section must be read and
observed.
specification of connections on the Sunny Island
You must read and observe the sections for the connections used.
You must read and observe this section.
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7.2 Connection Area
Figure8: Connection area of the Sunny Island inverter
PositionDesignationPositionDesignation
ADC+ connectionIEnclosure opening for DC-
BDC- connectionKEnclosure opening for DC+
CBatTmp and BatCur connectionsLEnclosure opening for PE/ExtVtg
DBatVtgOut and DigIn connectionsMEnclosure opening for AC2
E2 interface slotsNEnclosure opening for AC1
FRelay1 and Relay2 connectionsOExtVtg connection
GCommunication connectionPAC1 connection
HCable feed-through plateQAC2 connection
7.3 Connecting the Grounding Conductor in Systems With Grounded Battery
If you ground the battery, you can ground it at the positive terminal or at the negative terminal with a grounding
conductor. SMA Solar Technology AG does not recommend grounding the battery. If the battery is grounded, the
enclosure of the Sunny Island must also be grounded. This additional grounding is no substitute for the grounding at
connections AC1 and AC2.
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Conductor cross-section:
You must determine the required conductor cross-section of the grounding conductor, taking into account the applicable
local standards and directives. The calculation of the grounding conductor cross-section depends on the type and size of
the connected battery, the external fuse in the BatFuse, and the material of the grounding conductor.
Example: Calculation of the grounding conductor cross-section
Grounding conductor made of copper. The required cross-section of the grounding conductor can be calculated using
the following formula:
SC
= conductor cross-section in mm²
u
= short-circuit current in A
I
SC
= interruption time in s
t
Typical tripping times for an LV/HRC fuse are around 25 ms for short-circuit currents between 2,000 A and 10,000 A.
Grounding with a cross-section of 16 mm² is sufficient for short-circuit currents up to 10,000 A.
Cable requirement:
☐ Copper wire
☐ Maximum conductor cross-section: 16 mm²
☐ The cross-sections of the battery grounding conductor and Sunny Island inverter grounding conductor must be the
same.
Procedure:
1. Calculate the cross-section of the grounding conductor.
2. Ground the battery at the positive terminal or negative terminal using a conductor with the calculated cross-section.
3. Also ground the Sunny Island enclosure using a conductor with the calculated cross-section, as follows:
• Strip the grounding conductor.
• Place the clamping bracket over the conductor. Position the
conductor on the left.
• Fasten the clamping bracket with the hexagon socket screw
M6x16 and a conical spring washer (AF 5, torque: 4 Nm to
5.7 Nm). The teeth of the conical spring washer must face the
clamping bracket.
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7.4 Connecting the Devices
7.4.1 Connecting the Fuse Switch-Disconnector BatFuse to the Sunny Island
Cables for DC connection
Long cables and insufficient conductor cross-sections reduce the efficiency of the system and the overload capacity
of the Sunny Island inverter. The maximum cable length from the battery to the Sunny Island via the fuse
switch-disconnector is 10 m. The recommended minimum conductor cross-section is dependent upon the battery
voltage, power, and cable length:
Sunny IslandCable length*
SI 8.0H≤ 5 m70 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
>5 m95 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
SI 6.0H≤ 5 m50 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
>5 m70 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
SI 4.4M≤ 5 m50 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
>5 m70 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
SI 3.0M≤ 5 m50 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
>5 m70 mm²14 mm to 21 mmM8, 20 mm to 25 mm wide
* Cable length from the battery to the Sunny Island via the fuse switch-disconnector
** Maximum cable diameter on the Sunny Island: 25 mm Maximum cable diameter on the BatFuse: 21 mm
Danger to life due to incompatible lithium-ion battery
An incompatible lithium-ion battery can lead to a fire or an explosion. With incompatible lithium-ion batteries, it is not
ensured that the battery management will protect the battery.
• Ensure that the battery complies with the locally applicable standards and directives and is intrinsically safe.
• Ensure that the lithium-ion batteries are approved for use with the Sunny Island.
The list of lithium-ion batteries approved for the Sunny Island is updated regularly (see the Technical Information
"List of Approved Lithium-Ion Batteries" at www.SMA-Solar.com).
• If no lithium-ion batteries approved for the Sunny Island can be used, use lead-acid batteries.
Conductor
cross-section
Cable diameter**
Terminal lug
Procedure:
1. Ensure that the load-break switch of the BatFuse is open and secured against reconnection.
2. On the Sunny Island, remove all screws of the lower enclosure lid using an Allen key (AF 5) and remove the
3. Clean the contact surfaces of the DC+ and DC- connections with ethanol, for example. This reduces the transition
Installation ManualSI30M-44M-60H-80H-IA-en-3027
enclosure lid. Retain the screws and conical spring washers for later use.
resistance on the contact surfaces. A low transition resistance increases the system stability and minimizes the risk of
damage to the Sunny Island.
7 Electrical ConnectionSMA Solar Technology AG
/05*$&
4.
Damage to Sunny Island inverter due to reverse polarity or incorrect terminal lug selection
If the DC cables are swapped, high currents will flow after the load-break switch has closed and these can damage
the Sunny Island.
• Fasten the DC power cables to the DC connection with
M8x20 screws, ensuring correct polarity (torque: 12 Nm). In
doing so, ensure that the cable is connected correctly (see
Section7.5.1 "Connecting the DC Power Cable", page50)
and adhere to the following screw assembly: screw head |
spring washer | fender washer | terminal lug | DC
connection.
☑ The contact surfaces of the fender washers have full
contact with the terminal lugs.
7.4.2 Connecting the Utility Grid in the System for Increased
Self-Consumption
Requirements:
☐ The system is not a battery backup system
☐ For connection of the Sunny Island inverter to the utility grid, there must be a circuit breaker and a type A
residual-current device on the distribution board (for circuitry overview, see the Quick Reference Guide
"SMA Flexible Storage System").
Procedure:
1. On the Sunny Island, connect the power cable to the terminals
AC2 Gen/Grid: Ensure that the cable is correctly connected (see
Section7.5.2 "Connecting the AC Power Cable", page52).
• Connect the line conductor to AC2 Gen/Grid L.
• Connect the neutral conductor to AC2 Gen/Grid N
• Connect the grounding conductor to AC2 Gen/Grid PE.
2. Connect an additional grounding conductor to the AC1 Loads/SunnyBoys PE terminal if the power cable
conductor cross-section is smaller than 10 mm² (see Section7.5.3 "Connecting the Grounding Conductor",
page53).
.
TT
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7.4.3 Connecting an Automatic Transfer Switch in the Battery Backup
System
7.4.3.1 Automatic Transfer Switch Function
The automatic transfer switch separates the utility grid from the battery backup grid in battery backup systems. The control
cable, measuring cable and power cable link the automatic transfer switch to the Sunny Island (for circuitry overview,
see the Quick Reference Guide "SMA Flexible Storage System with Battery Backup Function").
7.4.3.2 Connecting the AC Power Cables to the Automatic Transfer Switch
The AC power cables conduct the energy between the battery backup grid and the Sunny Island (for circuitry
overview, see the Quick Reference Guide "SMA Flexible Storage System with Battery Backup Function").
Requirements:
☐ For a three-phase battery backup system, L1 must be assigned to the master, L2 to slave 1, and L3 to slave 2.
This creates a right-hand rotating magnetic field.
☐ The power of the AC sources in the battery backup grid must not exceed the maximum connected power of the PV
inverters in the battery backup systems (see Section10.2 "AC2 Connection for Utility Grid and Generator (External
Energy Source)", page95). The powers of the individual Sunny Island inverters are added to yield the total
maximum power.
Cable requirements:
☐ Copper wire
☐ Number of conductors in the cable: 3
☐ Conductor cross-section: 10 mm² to 16 mm²
☐ Cable diameter: 9 mm to 18 mm
Procedure:
• On the Sunny Island, connect the power cable from X3 to terminal
AC2 Gen/Grid (for circuitry overview, see the Quick Reference
Guide
"SMA Flexible Storage System with Battery Backup Function").
Ensure that the cable is correctly connected (see Section7.5.2
"Connecting the AC Power Cable", page52).
• Connect the line conductor to AC2 Gen/Grid L.
• Connect the neutral conductor to AC2 Gen/Grid N
• Connect the grounding conductor to AC2 Gen/Grid PE.
.
TT
7.4.3.3 Connecting the Control Cables to the Automatic Transfer Switch
The control cables conduct the control signals of the multifunction relays to the contactors (for circuitry
overview, see the Quick Reference Guide "SMA Flexible Storage System with Battery Backup Function").
Procedure:
1. On the master, connect the cable from X5 L and X5 N (for the
control voltage) to terminal AC1 Loads/SunnyBoys. Ensure that
the cable is correctly connected (see Section7.5.2 "Connecting
the AC Power Cable", page52).
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2.
Danger to life from electric shock due to incorrect insulation
• Connect the control cable of X4 1 and X4 2 to the Relay1 C
and Relay1 NC terminals. Ensure that the cable is correctly
connected (see Section7.5.5 "Connecting Relay 1 and
Relay 2", page55).
3.
Danger to life from electric shock due to incorrect insulation
• Connect the control cable of X5 1 and X5 2 to the Relay2 C
and Relay2 NO terminals. Ensure that the cable is correctly
connected (see Section7.5.5 "Connecting Relay 1 and
Relay 2", page55).
7.4.3.4 Connecting the Measuring Cables to the Automatic Transfer Switch
The Sunny Island measures the voltages of the respective line conductors via one measuring cable. In addition,
the master also verifies whether the tie switch is activated or deactivated (for circuitry overview, see the Quick
Reference Guide "SMA Flexible Storage System with Battery Backup Function").
Procedure:
1. On the Sunny Island, connect the measuring cable X4 Ln * and
X4 N for voltage monitoring to the ExtVtg terminal. Ensure that
the cable is correctly connected (see Section7.5.7 "Connecting
ExtVtg", page57).
2. At the master, connect the tie switch monitoring. Ensure that the cable from X5 3 and X5 4 is correctly connected
(see Section7.5.6 "Connecting BatVtgOut, DigIn, BatTMP, and BatCur", page56).
• Connect BatVtgOut − with DigIn − within the master.
• Connect the insulated conductor from X5 3 to DigIn+.
• Connect the insulated conductor from X5 4 to BatVtgOut+.
* Ln = L1 to L3
30SI30M-44M-60H-80H-IA-en-30Installation Manual
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