SMA SI 3.0-11 Quick Reference Guide V.3.0

Installation - Quick Reference Guide

SMA FLEXIBLE STORAGE SYSTEM with Battery Backup Function

Battery backup systems including increased self-consumption with SUNNY ISLAND 3.0M / 4.4M / 6.0H / 8.0H and SUNNY HOME MANAGER

Ersatzstrom-IS-en-30 | Version 3.0 ENGLISH

Legal Provisions SMA Solar Technology AG

Legal Provisions

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.

Trademarks

All trademarks are recognized, even if not explicitly identified as such. A lack of identification does not mean that a product or symbol is not trademarked.

The BLUETOOTH marks by SMA Solar Technology AG is under license.

Modbus

is a registered trademark of Schneider Electric and is licensed by the Modbus Organization, Inc.

QR Code is a registered trademark of DENSO WAVE INCORPORATED.

Phillips Torx

and Pozidriv® are registered trademarks of Phillips Screw Company.

is a registered trademark of Acument Global Technologies, Inc.

word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of these

SMA Solar Technology AG

Sonnenallee 1 34266 Niestetal Germany

Tel. +49 561 9522-0 Fax +49 561 9522-100 www.SMA.de E-mail: info@SMA.de

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SMA Solar Technology AG Table of Contents

Table of Contents

1 Information on this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Content and Structure of This Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.5 Symbols for Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.6 Typographies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.7 Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Information and System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.1 Requirements of the "VDE Forum Network Technology / Network Operations (FNN)" . . . . . . . . . . . . . . . 12

3.2 System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.3 Design and Functions of the Battery Backup System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.4 Design and Functions of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4.1 Devices of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

3.4.2 Grid Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

3.4.3 Grounding Device for the Battery Backup Grid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

3.4.4 Phase Coupling for Single-Phase Battery Backup Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

4 Battery Backup Systems With All-Pole Disconnection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.1 Single-Phase Battery Backup System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.1.1 Schematic Diagram of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

4.1.2 Circuitry Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

4.1.3 Connecting the Sunny Island Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

4.2 Three-Phase Battery Backup System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.2.1 Schematic Diagram of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

4.2.2 Circuitry Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

4.2.3 Connecting the Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

4.2.4 Connecting the Slaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

5 Battery Backup Systems Without All-Pole Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.1 Single-Phase Battery Backup System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.1.1 Schematic Diagram of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

5.1.2 Circuitry Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

5.1.3 Connecting the Sunny Island Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

5.2 Three-Phase Battery Backup System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.2.1 Schematic Diagram of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

5.2.2 Circuitry Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

5.2.3 Connecting the Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

5.2.4 Connecting the Slaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

6 Connecting the Sunny Home Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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Table of Contents SMA Solar Technology AG

7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

7.1 Basic Configuration of the Sunny Island Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7.2 Testing the Automatic Transfer Switch Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.3 Adjusting the Configuration of the Sunny Island Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7.3.1 Countries in Which the Configuration Must Be Adjusted. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

7.3.2 Adjusting the Configuration for Denmark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

7.3.3 Adjusting the Configuration for France . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

7.3.4 Adjusting the Configuration for Austria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

7.3.5 Adjusting the Configuration for Switzerland . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

7.4 Adjusting the Configuration of the PV Inverters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

7.5 Attaching the Labels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

7.6 Activating Phase Coupling in Single-Phase Battery Backup Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

7.7 Commissioning System With Increased Self-Consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

7.7.1 Preparing BLUETOOTH Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

7.7.2 Commissioning a System With Increased Self-Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

7.8 Commissioning a System Without Increased Self-Consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

8 Contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

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SMA Solar Technology AG 1 Information on this Document

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1 Information on this Document

1.1 Validity

This document is valid for the SMA Flexible Storage System with battery backup function with the following SMA products:

• HM-BT-10.GR2 (Sunny Home Manager) from firmware version 1.04

• 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 Content and Structure of This Document

This document summarizes the specific information for the SMA Flexible Storage System with battery backup function (b attery backup system). Circuitry overviews provide you with a basis for setting up a battery backup system. The structure of the document specifies the chronological sequence for configuration and commissioning. This document does not replace the documentation of the individual products. You will find details and help in the event of difficulties in the documentation of the respective product.

1.3 Target Group

The tasks described in this document must 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 precautions

1.4 Additional Information

Links to additional information can be found at www.SMA-Solar.com:

Document title Document type

SMA Flexible Storage System with Battery Backup Function Planning guidelines

1.5 Symbols for Information

Symbol Explanation

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 requirement for meeting a specific goal ☑ Desired result ✖ A problem that might occur

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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

Information that is important for a specific topic or goal, but is not safety-relevant

1 Information on this Document SMA Solar Technology AG

1.6 Typographies

Typography Use Example bold • Display messages

• Parameters

• Connections

•Slots

• Elements to be selected

• Elements to be entered

> • Several elements that are to be selected • Select 600# Direct Access > Select

[Button/Key] • Button/key on the inverter to be selected

or pressed

• Connect the grounding conductor to AC 2Gen/Grid.

• Select the parameter 235.01

GnAutoEna and set to Off.

Number.

•Press [ENTER].

1.7 Nomenclature

Complete designation Designation in this document

SMA Flexible Storage System with battery backup function

Sunny Boy, Sunny Mini Central, Sunny Tripower PV inverter Grid failure or deviation from the country-specific limiting

values for voltage and frequency

Battery backup system

Grid failure

The term parameter includes parameters with configurable values as well as parameters for displaying values.

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SMA Solar Technology AG 2 Safety

2 Safety

2.1 Intended Use

In the event of grid failure, a battery backup system with Sunny Island supplies loads with energy and a grid-tie PV system with voltage. In the event of grid failure, an automatic transfer switch disconnects the battery backup grid from the utility grid. After disconnection, the loads and the PV system have no supply for approximately five seconds, until the battery backup system can provide active and reactive power once more. The battery backup system supplies the loads and the PV system can synchronize with the battery backup grid and feed in.

The battery backup system should only be used in countries for which it is licensed or for which it is released by SMA Solar Technology AG and the grid operator. To fulfill the technical connection requirements of the grid operator and the local standards and directives, you must select one of the following basic structures:

• Battery backup system with all-pole disconnection In the event of grid failure, a tie switch disconnects all line conductors and the neutral conductor from the utility grid.

The tie switch is designed with built-in redundancy. If the technical connection requirements of the grid operator or the local standards and directives call for or allow all-pole disconnection, you must install this basic structure. You must install all-pole disconnection in the following countries:

–Belgium –Denmark –Germany –France –Austria –Switzerland

• Battery backup system without all-pole disconnection In the event of grid failure, a tie switch disconnects all line conductors from the utility grid. The neutral conductor of

the battery backup grid remains permanently connected to the utility grid. If the technical connection requirements of the grid operator or the local standards and directives prohibit disconnection of the neutral conductor, you must install this basic structure. In Australia, you must install a battery backup system without all-pole disconnection.

Each basic structure can be designed either as a three-phase battery backup grid or as a single-phase battery backup grid. Single-phase battery backup grids can be connected to three-phase utility grids.

In a three-phase battery backup system, in the event of grid failure, three Sunny Island inverters supply all line conductors with the corresponding line conductor. The three Sunny Island inverters are c onnected in parallel on the DC side and form one cluster. Only Sunny Island inverters of the same device type may be installed in a cluster. In a three-phase battery backup system, both single-phase and three-phase PV inverters can be connected. Multiple clusters must not be connected together.

In a single-phase battery backup system, in the event of grid failure, one Sunny Island supplies the battery backup grid. A grid failure is only recognized at the line conductor which is connected to the Sunny Island. In the event of grid failure, only single-phase PV inverters can feed in to a single-phase battery backup grid. A phase coupling, in the event of grid failure, enables combination of the line conductors to a single-phase distribution grid. With phase coupling, all the loads in the battery backup grid must be single-phase. No more than one Sunny Island may be connected in a single-phase battery backup system.

A PV system can be connected in the battery backup grid. The PV system must be suitable for use in battery backup systems (see the Planning Guidelines "SMA Flexible Storage System with Battery Backup Function" at www.SMA-Solar.com). The power of the PV system must be appropriate for the system (see Section3.2 "System Information", page12).

The automatic transfer switch is not a distribution board for the loads or the PV system. The loads and the PV system must be secured with protective devices in accordance with the local standards and directives. Grid-forming voltage sources (e.g., generators) must not be connected.

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2 Safety SMA Solar Technology AG

The utility grid connected to the automatic transfer switch must be a TN or TT system. The battery backup system is not suitable for supplying life-sustaining medical devices.

In battery backup systems, the Sunny Island uses lead-acid batteries or lithium-ion batteries for energy storage. Ensure that the battery room is sufficiently ventilated when using lead-acid batteries (see battery manufacturer's documentation). If lithium-ion batteries are connected, the battery management of the lithium-ion battery must be compatible with the Sunny Island (see the Planning Guidelines "SMA Flexible Storage System with Battery Backup Function" at www.SMA-Solar.com). The lithium-ion battery must be able to supply enough current at maximum output power of the Sunny Island inverter (for technical data, see the Sunny Island inverter installation manual).

In single-phase battery backup systems, the multifunction relays of the Sunny Island inverter cannot be configured. In three-phase battery backup systems, the slaves can control devices in the system (e.g., load-shedding contactors), each via two multifunction relays. The multifunction relays of the master cannot be configured.

The automatic transfer switch must be wired and connected in accordance with this documentation. The equipment or devices of the automatic transfer switch must satisfy protection class II and be operable without prior knowledge of electrical technology.

In battery backup systems, the following products must not be connected:

• Sunny Island Charger or other DC charge controllers

• DC loads

The battery backup system records the grid feed-in and purchased electricity with an SMA Energy Meter only. An SMA Energy Meter does not replace the energy meter of the electric utility company. The grid feed-in and the purchased electricity are transmitted to one Sunny Island via Speedwire. Therefore, the Sunny Island must be fitted with the Speedwire data module Sunny Island.

The Sunny Home Manager must not be installed in PV systems in which a Sunny WebBox is installed. The individual products in the battery backup system must be used for their intended purpose (see documentation of each

product). Any use of the system other than that described in the Intended Use section does not qualify as appropriate. The enclosed documentation is an integral part of the products. Keep the documentation in a convenient place for future

reference and observe all instructions contained therein.

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2.2 Safety Precautions

This section contains safety precautions that must be observed at all times when working on or with the system. To prevent personal injury or property damage and to ensure long-term operation of the system, read this section carefully and follow all safety precautions at all times.

Danger to life from electric shock due to circuit breakers that cannot be tripped

In the battery backup grid, only the circuit breakers that can be tripped by the Sunny Island can be tripped in the event of a grid failure. Circuit breakers with a higher operating current cannot be tripped. Under fault conditions, there may be a voltage that poses a danger to life present on accessible parts for several seconds. This can result in fatal or serious injury.

• Check whether a circuit breaker has a higher trip characteristic than the following circuit breakers which can be tripped:

– SI3.0M-11 and SI4.4M-11: circuit breaker with trip characteristic B6 (B6A) – SI6.0H-11 and SI8.0H-11: circuit breaker with trip characteristic B16 (B16A) or circuit breaker with trip

characteristic C6 (C6A)

If a circuit breaker has a higher trip characteristic than the specified circuit breaker which can be tripped, you should also install a residual-current device of type A.

Danger to life from electric shock due to live voltage

High voltages are present in the battery backup system. When covers are removed (e.g., an enclosure lid), live components can be touched. Touching can result in death or serious injury due to electric shock.

• 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 – At the grid-connection point, the circuit breaker of the battery backup system – In the automatic transfer switch, all circuit breakers – Load-break switch of the battery

• Ensure that the battery backup 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 automatic transfer switch.

• Cover or isolate any adjacent live components.

Danger to life from electric shock due to damaged devices

Operating a damaged device can lead to hazardous situations that can result in death or serious injuries due to electric shock.

• Only use the battery backup system when it is technically faultless and in an operationally safe state.

• Ensure that all safety equipment is freely accessible at all times.

• Make sure that all safety equipment is in good working order.

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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 is intrinsically safe and 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 constantly (see Technical Information "List

of Approved Lithium-Ion Batteries" at www.SMA-Solar.com).

• If no lithium-ion batteries approved for Sunny Island inverters can be used, you should use lead-acid batteries.

Danger to life due to explosive gases

Explosive gases may escape from the battery and cause an explosion. This can result in fatal 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.

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 isolated from the Sunny Island, battery voltage is still temporarily present at 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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Damage to three-phase loads during phase coupling

If three-phase loads are connected to a single-phase utility grid during phase coupling, SMA Solar Technology AG cannot rule out damage to the three-phase loads.

• Ensure that, during phase coupling, only single-phase loads are connected to the battery backup grid.

Damage to the tie switch due to incorrect design

If the ampacity of the tie switch is not sufficient, the tie switch becomes overloaded and is damaged.

• Adjust the ampacity of the tie switch in accordance with the requirements on site. The tie switch must be designed for at least the operating range of the upstream fuse or the maximum short-circuit current of the PV system.

Damage to the battery due to incorrect settings

Incorrect settings can lead to premature aging of the battery. Settings of the parameters in the menu 220# Battery influence the charging behavior of the Sunny Island inverter.

• Ensure that the values recommended by the battery manufacturer are set for the battery (for the battery technical data, see the documentation of the battery manufacturer).

Destruction of devices due to electrostatic discharge (ESD)

If enclosure parts are removed, the devices (e.g., Sunny Island or PV inverter) can be damaged or destroyed if electronic components or connections are touched.

• Do not touch any electronic components in open devices.

• Ground yourself before touching any connections.

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3 Information and System Description SMA Solar Technology AG

3 Information and System Description

3.1 Requirements of the "VDE Forum Network Technology / Network Operations (FNN)"

The information only applies for systems for which the following characteristics are all applicable:

• The system stores energy for increased self-consumption.

• Only one Sunny Island is connected in the system.

• The grid operator requires compliance with the Technical Information "Connection and Operation of Storage Units" of the FNN. Currently, only the grid operators in Germany require compliance with the above-mentioned Technical Information (status: June 2014).

In these systems, the Sunny Island must be connected to a line conductor supplied by a single-phase PV inverter. If there are only three-phase PV inverters connected in the system, the Sunny Island can be connected to any line conductor.

The requirements of the Technical Information "Connection and Operation of Storage Units in Low-Voltage Networks" published by the FNN influence the discharge behavior of the Sunny Island inverter. In systems with one Sunny Island and single-phase PV inverters, the SMA Flexible Storage System reduces the maximum discharge power of the Sunny Island inverter if necessary (for examples of correct connection of the PV inverters, see quick reference guide "SMA Flexible Storage System").

3.2 System Information

Battery backup systems without increased self-consumption

If you are not increasing the self-consumption of PV energy, the following devices are not required:

•SMA Energy Meter

• Sunny Home Manager

• Speedwire data module Sunny Island

Information on batteries

Lithium-ion batteries in battery backup systems

In order to meet the requirements of battery backup systems in the event of grid failure, the Sunny Island has a high overload capacity. The prerequisite for this overload capacity is that the battery is able to supply sufficient current. With lithium-ion batteries, this ampacity cannot be taken for granted.

• Clarify with the battery manufacturer whether the battery is suitable for battery backup systems with Sunny Island. Note especially the ampacity if, in the event of grid failure, the battery backup grid is supplied by the Sunny Island.

Recommendations for battery capacity

SMA Solar Technology AG recommends the following minimum battery capacities. The battery capacities apply for a ten-hour electric discharge (C10).

• Single-phase battery backup system with SI3.0M-11: 100 Ah

• Single-phase battery backup system with SI4.4M-11: 100 Ah

• Single-phase battery backup system with SI6.0H-11: 120 Ah

• Single-phase battery backup system with SI8.0H-11: 160 Ah

• Three-phase battery backup system with three SI3.0M-11: 300 Ah

• Three-phase battery backup system with three SI4.4M-11: 300 Ah

• Three-phase battery backup system with three SI6.0H-11: 360 Ah

• Three-phase battery backup system with three SI8.0H-11: 480 Ah

The minimum battery capacity must be observed to ensure stable operation of the system.

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SMA Solar Technology AG 3 Information and System Description

Information on the automatic transfer switch

Wiring and connection of automatic transfer switches

• Do not bridge the neutral conductors of connections X1 to X5. If the neutral conductor connections are bridged,

residual-current devices could trip.

• Label the equipment and devices of the automatic transfer switch in accordance with the schematic diagrams.

This makes installation and commissioning easier and simplifies the support process in the event of service.

• Only install an SMA Energy Meter if the systems have increased self-consumption.

Install the SMA Energy Meter in such a way that it can measure the total purchased electricity and grid feed-in.

Connection of automatic transfer switches for single-phase battery backup systems

• With single-phase battery backup systems, connect circuit breaker F1 and the Sunny Island to the same line

conductor. Ensure that only this line conductor of the Sunny Island inverter is monitored for grid failure.

• Connect the PV inverter and the Sunny Island to the same line conductor if possible. This way, in the event of

grid failure, the PV inverters are supplied with voltage directly and then can feed in even if phase coupling is deactivated.

Information on the Sunny Island

Connection of the neutral conductor

At connection AC2, there are two terminals N and N

• In battery backup systems, at connection AC2, always connect the neutral conductor to terminal N

for the connection of the neutral conductor.

This ensures that the Sunny Island disconnects at all poles.

Device types within a cluster

All Sunny Island inverters must be of the same device type.

Information on the communication devices

Requirements for the router and network switches for Speedwire devices An SMA Flexible Storage System has the following requirements for the communication devices:

• All Speedwire devices must be connected to the same router or network switch.

• The router and optionally one or more network switches must fully support Multicast.

• The router must support "Internet Enabled Devices" with the interfaces SIP and STUN.

The most common routers and network switches support Multicast and "Internet Enabled Devices".

Electricity supply of communication devices

During a grid failure, only the devices in the battery backup grid are supplied with current.

• Connect the electricity supply of the Sunny Home Manager, router, and the optional network switches to the

battery backup grid.

The Sunny Home Manager does not support wind power inverters or CHP plants

The Sunny Home Manager only supports PV inverters. If your system combines various AC power sources (e.g., PV system and small wind turbine system), the Sunny Home Manager can only detect the PV inverters and limit their power. In the Sunny Home Manager system, no wind power inverters or CHP plants are displayed in Sunny Portal. Since the data from wind power inverters or CHP plants is not taken into account by the Sunny Home Manager, the data calculated in Sunny Portal and the displayed diagrams may be inaccurate. However, you have the option of displaying the wind power inverters via the Sunny Explorer software and configuring them if necessary (see Sunny Explorer documentation).

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3 Information and System Description SMA Solar Technology AG

Information on the PV system

Maximum PV system power In battery backup systems, the maximum power of the PV system depends on the total power of the Sunny Island.

• Maximum output power of the PV system per SI3.0M-11: 4,600 W

• Maximum output power of the PV system per SI4.4M-11: 4,600 W

• Maximum output power of the PV system per SI6.0H-11: 9,200 W

• Maximum output power of the PV system per SI8.0H-11: 12,000 W

Observance of the maximum output power of the PV system is a requirement for stable operation of the battery backup system during a grid failure.

Frequency-dependent control of active power feed-in

In battery backup systems, the active power of the PV inverters must be controllable depending on the frequency.

• With existing systems, ensure that the PV inverters are controllable depending on the frequency (see Planning Guidelines "SMA Flexible Storage System with Battery Backup Function").

3.3 Design and Functions of the Battery Backup System

Figure1: Block circuit diagram of a single-phase battery backup system

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SMA Solar Technology AG 3 Information and System Description

When the utility grid is available again, the battery backup system synchronizes the battery backup grid with the utility grid. Following successful synchronization, the automatic transfer switch connects the battery backup grid to the utility grid. If the automatic transfer switch is connected to the utility grid, the battery backup system uses the battery for increased self-consumption.

You can set up and wire the automatic transfer switch yourself or acquire it pre-wired from another provider (see Planning Guidelines "SMA Flexible Storage System with Battery Backup Function" at www.SMA-Solar.com).

Connection of loads and the PV system

The automatic transfer switch is not a distribution board for the loads or the PV system. You must also install the necessary protective devices for the loads and the PV system.

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3 Information and System Description SMA Solar Technology AG

3.4 Design and Functions of the Automatic Transfer Switch

3.4.1 Devices of the Automatic Transfer Switch

Figure2: Schematic diagram of a single-phase automatic transfer switch with all-pole disconnection and SMA Energy Meter for increased

self-consumption (example)

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SMA Solar Technology AG 3 Information and System Description

An automatic transfer switch provides the following functions:

• Grid disconnection isolates the battery backup grid from the utility grid.

• The grounding device grounds the battery backup grid after it has been disconnected from the utility grid. The grounding device is only required in systems with all-pole disconnection.

• The phase coupling connects the line conductors of the battery backup system to a single-phase distribution grid. The phase coupling is a function for single-phase battery backup systems if the installation of the battery backup grid

is three-phase.

• The SMA Energy Meter measures the grid feed-in and the purchased electricity. The SMA Energy Meter is only required in systems for increased self-consumption.

3.4.2 Grid Disconnection

Within the automatic transfer switch, a tie switch disconnects the battery backup grid from the utility grid. The conditions at the tie switch differ depending on the installation site. SMA Solar Technology AG offers two basic structures for grid disconnection and these differ as far as the tie switch is concerned:

• Grid disconnection with all-pole disconnection of the battery backup grid from the utility grid In the event of grid failure, a tie switch disconnects all line conductors and the neutral conductor from the utility grid.

If the technical connection requirements of the grid operator or the local standards and directives call for or allow all-pole disconnection, you must install this basic structure. You must install all-pole disconnection in the following countries:

–Belgium –Denmark –Germany –France –Austria –Switzerland

• Grid disconnection without all-pole disconnection of the battery backup grid from the utility grid In the event of grid failure, a tie switch disconnects all line conductors from the utility grid. The neutral conductor of

Independent of the basic structure, you must adjust the ampacity of the tie switch in accordance with the requirements on site. The tie switch must be designed for at least the operating range of the upstream fuse or the maximum short-circuit current of the PV system.

The circuitry of the automatic transfer switch is designed in such a way that the tie switch disconnects only in the event of a grid failure. If you stop or switch off the Sunny Island, the battery backup grid remains connected to the utility grid. This means that you can carry out maintenance work on the battery without the supply to the loads being interrupted.

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