Planning Guidelines
SMA FLEXIBLE STORAGE SYSTEM WITH
BATTERY BACKUP FUNCTION
Circuitry Overviews, Schematic Diagrams and Material Lists
SI-Ersatzstrom-PL-en-11 | Version 1.1
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SMA Solar Technology AG
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34266 Niestetal
Germany
Tel. +49 561 9522-0
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© 2004 to 2014 SMA Solar Technology AG. All rights reserved
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Table of Contents
Table of Contents
1
Terms and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
PV Energy Despite Grid Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
SMA Flexible Storage System with Battery Backup Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Bridging Time and Self-Consumption Quota . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Conditions of Use of an SMA Flexible Storage System with Battery Backup Function . . . . . . 12
5.1
5.2
5.3
5.4
5.5
Certifications and Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Utility Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switching Times for Loads. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PV Inverters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
12
13
13
16
5.5.1
Recommendations for Battery Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5.5.2
Selection of the Battery Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5.5.3
Capacity of the Battery Utilized by the SMA Flexible Storage System with Battery Backup Function. . . . . . . .17
5.6 Sunny Island . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6
Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1
6.2
6.3
6.4
7
19
21
23
25
Automatic Transfer Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1
7.2
7.3
7.4
7.5
7.6
8
Single-Phase Battery Backup System with All-Pole Disconnection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Three-Phase Battery Backup System with All-Pole Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single-Phase Battery Backup System without All-Pole Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Three-Phase Battery Backup System without All-Pole Disconnection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Procurement of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Transfer Switch for Single-Phase Battery Backup System with All-Pole Disconnection . . . . . . . . .
Automatic Transfer Switch for Three-Phase Battery Backup System with All-Pole Disconnection . . . . . . . . .
Automatic Transfer Switch for Single-Phase Battery Backup System without All-Pole Disconnection . . . . . .
Automatic Transfer Switch for Three-Phase Battery Backup System without All-Pole Disconnection . . . . . . .
Operating Principle of the Automatic Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
27
30
33
34
36
Installation Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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SMA Solar Technology AG
1 Terms and Abbreviations
1 Terms and Abbreviations
Terms
Term
Explanation
Self-consumption
Self-consumption is a measure of the amount of PV energy which is utilized at the
point of generation, or in the immediate vicinity, for supplying the loads and for
charging the battery.
Self-consumption quota
The self-consumption quota is the proportion of the total PV energy generated that is
used for self-consumption.
Internal power supply
Internal power supply means that as great a proportion as possible of the energy
needed to supply the loads in a household is taken from PV energy generated on
site. The internal power supply indicates how much energy is drawn from the PV
system and from the battery.
Intermediate storage
Intermediate storage in a battery is a means of optimizing self-consumption or
internal power supply. This makes it possible to consume PV energy independently
of when it is generated, so that loads tied to running at specific times can also be
operated with PV energy.
Energy management system
An energy management system enables the automatic and intelligent optimization of
energy flows.
Battery backup grid
A battery backup grid is that part of a household grid which is supplied by the
battery backup system in the event of grid failure.
Battery backup system
A battery backup system provides an electricity supply for loads in case of grid
failure. In this case, the battery backup system switches automatically from the utility
grid to the alternative energy source.
Grid failure
A grid failure is an outage of the utility grid. If the utility grid deviates from the
country-specific thresholds for voltage and frequency, the Sunny Island will react in
the same way as if a utility grid failure has occurred.
Bridging time
The bridging time is the time from failure until restoration of the utility grid which is
bridged by the battery backup system.
Switching time
The switching time is the time needed by the battery backup system to restore the
supply of the loads in case of grid failure.
Abbreviations
Abbreviation
Designation
Explanation
AC
Alternating Current
–
DC
Direct Current
–
FLA
Flooded Lead Acid Batteries
–
PV
Photovoltaics
–
SOC
State of Charge
State of charge of the battery
VRLA
Valve Regulated Lead-Acid
–
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2 PV Energy Despite Grid Failure
SMA Solar Technology AG
2 PV Energy Despite Grid Failure
Whenever grid failures occur, the PV system will disconnect from the utility grid to ensure the safety of persons working
on the utility grid. For operators of a PV system or an SMA Flexible Storage System, this disconnection means that the
loads connected to their household grid are no longer supplied with energy.
We do occasionally experience grid failures as the following examples show:
• On November 4, 2006, the utility grid failed in parts of Germany, France, Belgium, Italy, Spain and Austria. This
grid failure was triggered by the disconnection of two high-voltage lines to enable the disembarkation of the cruise
liner "Norwegian Pearl“. Over ten million people were without electricity for up to 120 minutes.
• On November 11, 2012, the city of Munich experienced the worst grid failure in two decades. This grid failure was
triggered by a technical fault in an electrical substation. It lasted for approximately one hour and around
450,000 people were affected.
Long-term grid failures can have serious consequences for those affected: for instance, households and companies have
to manage without heat, light, telephones and computers, cooling chains are interrupted, and in agricultural enterprises
barn ventilation and heat lamps go out of service. To bridge this supply gap, existing PV systems could, for instance, be
converted into battery backup systems.
Battery backup systems with PV systems need batteries as intermediate storage units, since PV energy is not available at
all times. However, many PV systems have already been converted into energy management systems with intermediate
storage to enable optimized self-consumption or internal power supply. These energy management systems are already
equipped with batteries. These batteries can equally be utilized for the battery backup function. An example of this kind
of battery backup system is the SMA Flexible Storage System with battery backup function (battery backup system with
Sunny Island).
Figure 1:
6
Principle of an SMA Flexible Storage System with battery backup function
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SMA Solar Technology AG
2 PV Energy Despite Grid Failure
With an SMA Flexible Storage System with battery backup function, the existing PV system will be able to maintain the
electricity supply throughout a grid failure. The battery of the SMA Flexible Storage System not only takes care of the
intermediate storage of PV energy, but also supplies the loads during grid failure. The service life of the battery is hardly
affected by this dual utilization as long as the utility grid is basically stable.
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3 SMA Flexible Storage System with Battery Backup Function
SMA Solar Technology AG
3 SMA Flexible Storage System with Battery Backup Function
Figure 2:
Overview of an SMA Flexible Storage System with battery backup function
An SMA Flexible Storage System with battery backup function takes care of the continued supply of the loads with
electricity during a grid failure. To do this, an automatic transfer switch disconnects the household grid with the PV system
from the utility grid. When this happens, the battery inverter Sunny Island forms a battery backup grid and the PV system
can supply the loads. When the energy demand of the active loads exceeds the current power of the PV system, the
battery will provide the energy shortfall.
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3 SMA Flexible Storage System with Battery Backup Function
Devices of the SMA Flexible Storage System
Device
Function
Sunny Island 6.0H / 8.0H
The Sunny Island is a battery inverter. In the event of grid failure, the Sunny Island
forms a battery backup grid and regulates the energy distribution in this backup grid.
In grid-tie operation, the Sunny Island is responsible for the optimization of
self-consumption or internal power supply.
Sunny Remote Control
You can configure and control the Sunny Island via the Sunny Remote Control display.
BatFuse
The battery fuse box BatFuse is an external fuse switch-disconnector which protects the
battery connection cables of the Sunny Island. Furthermore, the BatFuse enables
DC-side disconnection of the Sunny Island.
Battery
The battery stores excess energy from the PV system. In grid-tie operation, this buffered
PV energy is used to optimize self-consumption or internal power supply, and in the
event of grid failure, it is used for supplying the loads.
Sunny Home Manager
The Sunny Home Manager is a device for monitoring PV systems and controlling loads
in households with PV systems.
SMA Energy Meter
The SMA Energy Meter is a measuring device which detects measured values at the
connection point and makes them available via Speedwire, e.g. to the Sunny Home
Manager.
Devices of the Automatic Transfer Switch
Device
Function
Grid disconnection
The grid disconnection function is performed by the tie switch. The design of the tie
switch depends on whether or not the utility grid is disconnected from the battery
backup grid at all poles (see Section 5.2 "Utility Grid", page 12).
Phase coupling
Phase coupling is an optional function for single-phase battery backup systems if the
utility grid is a three-phase systems.
With single-phase battery backup systems, only one Sunny Island is connected to the
automatic transfer switch. Therefore, without phase coupling only one line conductor
(e.g. L1), is protected against grid failure. In this case, the other two line conductors
(e.g. L2 and L3) cannot be protected.
Phase coupling enables combined switching of the line conductors. As a result, the
other two line conductors are also supplied with voltage in the event of grid failure.
This means that in the event of grid failure a three-phase household grid is transformed
into a single-phase battery backup grid. Phase coupling can be switched on
independently for the line conductors L2 und L3.
Grounding device
Planning Guidelines
In automatic transfer switches with all-pole disconnection, all poles of the battery
backup grid are disconnected from the utility grid in the event of grid failure. This
disconnection does not ground the neutral conductor. Therefore, in automatic transfer
switches with all-pole disconnection, a grounding device must ground the neutral
conductor in the event of grid failure. The grounding device protects persons working
on the system. It is configured for fail-safe operation (see Section 5.2 "Utility Grid",
page 12).
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4 Bridging Time and Self-Consumption Quota
SMA Solar Technology AG
4 Bridging Time and Self-Consumption Quota
This section describes a simple method by which you can estimate bridging time and self-consumption quota for an
SMA Flexible Storage System with battery backup function. For the storage capacity of the battery, an empirical value
of a typical battery backup system is assumed and verified by means of the estimate.
In the example, the assumed values for the energy demand of the loads in a private household, the peak power of the
PV system, and the storage capacity of the battery, are characteristic of a battery backup system in a four-person
single-family household in Germany.
Step 1: Estimation of self-consumption quota for an SMA Flexible Storage System
Input data:
• Peak power of the PV system: 5,000 Wp
• Annual energy demand: 5,000 kWh
• Storage capacity of the battery for the SMA Flexible Storage System: 10 kWh
It can be assumed that with lead-acid batteries the Sunny Island utilizes 50% of the battery storage capacity for
intermediate storage of PV energy. Hence, the usable storage capacity would amount to 5,000 Wh.*
Peak
------------power
---------------of
------the
--------PV
------system
-------------- = -5,000
---------------Wp
--------- = 1 Wp/kWh
Annual energy demand
5,000 kWh
Usable
-----------------storage
-----------------capacity
------------------ = --5,000
---------------Wh
-------- = 1 Wh/kWh
Annual energy demand
5,000 kWh
Transfer the calculated values to the diagram to estimate the self-consumption quota.
Figure 3:
Estimation of self-consumption quota with intermediate storage
The estimate results in a self-consumption quota of approximately 60%.
* Due to the seasonal battery operation, the use of the battery for intermediate storage is limited in winter and extended in summer. Therefore,
a usable range of 50% for intermediate storage can continue to serve as the basis for the estimate (see Section 5.5.3 "Capacity of the Battery
Utilized by the SMA Flexible Storage System with Battery Backup Function", page 17).
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4 Bridging Time and Self-Consumption Quota
Step 2: Estimation of energy demand in the event of grid failure
The annual energy demand of the household amounts to 5,000 kWh.
Annual
-----------------energy
----------------demand
----------------- = 5,000
---------------kWh
---------- = 13.6 kWh/day
365 days
365 days
It can be assumed that during a grid failure, electrical energy will be used sparingly, e.g. by switching off energy-intensive
loads. As a result, the daily energy demand of 13.6 kWh can be reduced by 40%. Thus, the energy demand of this
household will be approximately 8 kWh in the event of a 24-hour power outage.
Step 3: Estimation of PV generation during a grid failure
The peak power of the PV system is approximately 5 kWp. In Germany in the winter, it can be assumed that
0.7 kWh/kWp will be generated. Therefore, an energy yield from PV production of 3.5 kWh between sunrise and sunset
results.
Step 4: Calculation of battery storage capacity required for the battery backup function
Input data:
• Energy demand of the household: 8 kWh
• Energy yield from PV production: 3.5 kWh
Battery storage capacity = Energy demand – PV production = 8 kWh – 3.5 kWh = 4.5 kWh
The required battery storage capacity is 4.5 kWh. In Step 1 a storage capacity of 10 kWh was established. Hence, in
this example 45% of the battery storage capacity will be needed as energy reserve for grid failure on a winter day.
Conclusion
With lead-acid batteries, a default value of 45% of the Sunny Island battery storage capacity is reserved for the battery
backup function in winter operation, within the corresponding value range of 15% to 60% (see Section 5.5 "Batteries",
page 16). Thus, the battery used for the SMA Flexible Storage System is also adequate for the battery backup function.
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5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function SMA Solar Technology AG
5 Conditions of Use of an SMA Flexible Storage System with Battery
Backup Function
5.1 Certifications and Licenses
The SMA Flexible Storage System with battery backup function is licensed for use in the following countries:
• Germany
• Australia
• Denmark
• Belgium
• Austria
However, its use in other countries is not ruled out. The Sunny Island is certified in accordance with VDE-AR-N 4105 and
AS4777. In certain countries, proof of these certifications is sufficient. Please consult the grid operator.
5.2 Utility Grid
Only utility grid permitted as external energy source
The only permitted external energy source connected to the SMA Flexible Storage System with battery backup
function is the utility grid. The SMA Flexible Storage System with battery backup function does not support operation
with a generator (e.g. diesel generator).
Characteristics of the Battery Backup Grid
Characteristic
Single-phase battery backup grid
Utility grid
Three-phase battery backup grid
TN or TT system
Behavior of the Sunny Island in
the event of grid failure
Recognition of grid failure
Single-phase or three-phase
Three-phase
One Sunny Island supplies the battery
backup grid.
Three Sunny Island inverters switched in
parallel on the DC side supply each line
conductor with the corresponding phase.
Grid failure is only recognized on the line
conductor which is connected to the
Sunny Island (e.g. L1).
Grid failure is recognized on all line
conductors.
Supply of the loads in the event Only some of the loads are supplied (e.g.
of grid failure
the loads connected to L1).
Grid feed-in by the PV inverters
in the event of grid failure
All loads are supplied.
Only single-phase PV inverters can feed
energy into the grid.
Single-phase and three-phase
PV inverters can feed energy into the
grid.
Phase coupling in the battery
backup grid
Possible
Not possible
Rotating magnetic field in the
battery backup grid
No: even with phase coupling, the
battery backup grid remains
single-phase.
Yes: three Sunny Island inverters form a
three-phase battery backup grid with
rotating magnetic field.
Phase Coupling
If three-phase loads are connected to a single-phase utility grid with phase coupling, SMA Solar Technology AG cannot
rule out damage to the three-phase loads. With phase coupling, single-phase loads only must be connected to the battery
backup grid.
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SMA Solar Technology AG 5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function
Battery Backup Grid with or without All-Pole Disconnection
Battery backup system with all-pole
disconnection
Battery backup system without all-pole
disconnection
Operating
In the event of grid failure, a tie switch
disconnects all line conductors and the neutral
conductor of the battery backup grid from the
utility grid. The tie switch is designed with
built-in redundancy.
In the event of grid failure, a tie switch
disconnects all line conductors of the battery
backup grid from the utility grid. The neutral
conductor of the battery backup grid remains
permanently connected to the utility grid. The
tie switch is not designed with built-in
redundancy.
Criterion for use
If the technical connection requirements of the
grid operator or the locally applicable
standards and directives call for or allow
all-pole disconnection, you must install the
battery backup system with all-pole
disconnection.
If the technical connection requirements of the
grid operator or the locally applicable
standards and directives prohibit
disconnection of the neutral conductor, you
must install the battery backup system without
all-pole disconnection.
Deployment location
E.g. Germany, Austria, Belgium, Denmark
E.g. Australia
5.3 Switching Times for Loads
The SMA Flexible Storage System with battery backup function does not fulfill the requirements of an uninterruptible
power supply as defined in IEC 62040. 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 are not supplied for approximately five
seconds, until the battery backup system can provide active power and reactive power again.
If any single load (e.g. a computer) requires an uninterruptible power supply in compliance with the standard or a
switching time shorter than five seconds, this load will need a separate uninterruptible power supply in compliance with
IEC 62040.
Loads integrated in the battery backup grid via phase coupling have a switching time of 15 seconds, as the SMA Flexible
Storage System connects phase coupling with a time delay.
5.4 PV Inverters
PV inverters are suitable for use in an SMA Flexible Storage System with battery backup function providing that they
comply with the application guideline VDE-AR-N 4105. All PV inverters from SMA Solar Technology AG fulfill this
requirement.
The AC power that PV inverters are permitted to feed into the battery backup system is limited by the rated power of the
Sunny Island.
Type of battery
backup system
Single-phase
Three-phase
Planning Guidelines
Sunny Island device type
Rated power of the
Sunny Island
Maximum AC power of
the PV inverters
SI6.0H-11 (Sunny Island 6.0H)
4.6 kW
9.2 kW
SI8.0H-11 (Sunny Island 8.0H)
6.0 kW
12 kW
SI6.0H-11 (Sunny Island 6.0H)
13.8 kW
27.6 kW
SI8.0H-11 (Sunny Island 8.0H)
18.0 kW
36 kW
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5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function SMA Solar Technology AG
No three-phase PV inverters in single-phase battery backup systems
Three-phase PV inverters such as the Sunny Tripower are unsuitable for single-phase battery backup systems, as they
cannot feed into the battery backup grid in the event of grid failure.
Possible solutions:
• Replace the three-phase PV inverter by a combination of single-phase PV inverters, e.g. two Sunny Boy 4000TL
inverters instead of one Sunny Tripower 8000TL.
• Select a sufficiently large battery storage capacity to ensure the supply of the loads from the battery only over
the entire bridging time.
Requirements for Applications in Australia
If PV inverters are to be used in an SMA Flexible Storage System with battery backup function, they must limit their active
power as a function of frequency. SMA Solar Technology AG's suggestion for implementing frequency-dependent active
power limitation is described in the following diagram.
Figure 4:
Suggestion for frequency-dependent active power limitation by the PV inverter
Position
Description
1
As long as power frequency remains at 50 Hz, the PV inverter feeds into the grid at its maximum available
power. If power frequency rises to 50.2 Hz, the PV inverter starts to reduce its active power.
Setting on the PV inverter:
• Set the difference P-HzStr between starting frequency and power frequency to 0.2 Hz.
2
From a power frequency of 50.2 Hz, the PV inverter reduces its active power by 77% of the available
maximum power per Hz. The power frequency is monitored by the PV inverter.
Setting on the PV inverter:
• Set active power gradient P-WGra to 77%.
3a
If the power frequency continues to rise, the PV inverter further reduces its active power, down to the value
zero at 51.5 Hz.
3b
If the power frequency remains constant at a value under 51.5 Hz or continues to fall, the PV inverter stops
reducing active power. The PV inverter retains the current active power value and monitors power
frequency.
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SMA Solar Technology AG 5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function
Position
Description
4
Once the power frequency has fallen as far as 50.05 Hz, the PV inverter starts to increase its active power.
As long as the power frequency does not start to rise again, the PV inverter increases its active power by
10% of nominal power per minute up to the available maximum power.
Settings on the PV inverter:
• Set the difference P-HzStop between the reset frequency and the power frequency to 0.05 Hz.
• Set the active power gradient depending on reset frequency P-HzStopWGra to 10%.
Adjustment of network-relevant parameters
Since the product standard AS4777 does not stipulate frequency-dependent active power limitation, this control
setting is not stored in the country data set of the PV inverter. Therefore, certain parameters of the PV inverter need
to be adjusted.
• Coordinate the adjustment of these parameters with the grid operator (see Quick Reference Guide "Battery
backup systems" of the Sunny Island).
• Always have this parameter adjustment carried out by qualified persons (see installation manual of the
PV inverter).
In the following PV inverters you can activate frequency-dependent active power limitation.
PV inverters
Firmware version*
Sunny Boy (SB)
• SB 1300TL-10 / 1600TL-10 / 2100TL-10
4.52
• SB 2500TLST-21 / 3000TLST-21
2.50.41.R
• SB 3300-11
4.03
• SB 3800-11
4.02
• SB 2000HF-30 / 2500HF-30 / 3000HF-30
2.30.07.R
• SB 3000TL-21 / 3600TL-21 / 4000TL-21 / 5000TL-21
2.51.02.R
Sunny Mini Central (SMC)
• SMC 5000A / 6000A
1.50
• SMC 6000TL / 7000TL / 8000TL
3.32
• SMC 7000HV
1.81
• SMC 7000HV-11
2.21
• SMC 9000TLRP-10 / 10000TLRP-10 / 11000TLRP-10
1.40
Sunny Tripower (STP)
• STP 5000TL-20 / 6000TL-20 / 7000TL-20 / 8000TL-20 / 9000TL-20
2.50.01.R
• STP 8000TL-10 / 10000TL-10 / 12000TL-10 / 15000TL-10 / 17000TL-10
2.51.02.R
• STP15000TLEE-10 / 20000TLEE-10
2.54.03.R
* With older firmware versions, a firmware update is required (see installation manual of the PV inverter).
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5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function SMA Solar Technology AG
5.5 Batteries
5.5.1
Recommendations for Battery Capacity
SMA Solar Technology AG recommends the following minimum battery capacities:
Battery backup system
Battery capacity for a ten-hour electric discharge (C10)
Single-phase battery backup system with SI6.0H
120 Ah
Single-phase battery backup system with SI8.0H
160 Ah
Three-phase battery backup system with 3 SI6.0H
360 Ah
Three-phase battery backup system with 3 SI8.0H
480 Ah
The minimum battery capacity must be observed to ensure stable operation of the system.
5.5.2
Selection of the Battery Type
Lead-Acid Batteries
Sunny Island supports lead batteries of types FLA and VRLA, as well as various lithium-ion batteries. It is possible to
connect batteries with a battery capacity of 100 Ah to 10,000 Ah (C10).
Lithium-Ion Batteries
Lithium-ion batteries are especially suited for intermediate storage of PV energy due to their high cycle stability. Lithium-ion
batteries must be compatible with the Sunny Island.
The battery must be from one of the following manufacturers and must be approved by the manufacturer for Sunny Island
inverters:
• Akasol
• Dispatch Energy
• LG Chem
• Leclanché
• SAFT
• Samsung
• Sony
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 current-carrying ampacity cannot be taken for granted.
• Check with the battery manufacturer whether the battery is suitable for an SMA Flexible Storage System with
battery backup function. Pay particular attention to the current-carrying ampacity if the battery backup grid is
supplied by the Sunny Island in the event of grid failure.
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SMA Solar Technology AG 5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function
5.5.3
Capacity of the Battery Utilized by the SMA Flexible Storage System with
Battery Backup Function
In many regions, the PV energy available largely depends on the season and the hours of sunshine. The Sunny Island
offers the possibility of adjusting the battery management response to the location and the time.
Figure 5:
Ranges of the battery state of charge as a function of the season for the northern hemisphere (example)
Range
Explanation
SlfCsmp
Range for intermediate storage
PVRes
Range for maintaining the state of charge of the battery
BURes
Range for the battery backup function
BatRes
Range for protection against deep discharge
ProtRes
Range for protection during deep discharge
Due to the seasonal battery operation of the Sunny Island, a larger range is reserved for the battery backup function in
winter than in summer. This makes sense, as consumption in summer is lower and the PV yield is also much higher. The
limits for the ranges of battery state of charge are predetermined for lead-acid batteries and lithium-ion batteries by the
following value ranges of the Sunny Island.
Range
Lead-acid battery
Lithium-ion battery*
Shortest day
Longest day
Shortest day
Longest day
SlfCsmp
65% to 100%
45% to 100%
30% to 100%
28% to 100%
PVRes
60% to 65%
40% to 45%
25% to 30%
23% to 28%
BURes
15% to 60%
15% to 40%
13% to 25%
13% to 23%
BatRes
10% to 15%
10% to 15%
3% to 13%
3% to 13%
ProtRes
0% to 10%
0% to 10%
0% to 3%
0% to 3%
* The value ranges for lithium-ion batteries reserve a smaller proportion of battery capacity for the battery backup function: 10% of storage
capacity in summer and 12% in winter. Therefore, the proportion available for intermediate storage is correspondingly larger.
Planning Guidelines
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17
5 Conditions of Use of an SMA Flexible Storage System with Battery Backup Function SMA Solar Technology AG
5.6 Sunny Island
The maximum power consumption of the loads during the day and the type of battery backup system determine the
device type and the number of Sunny Island inverters. In a single-phase battery backup system, for instance, the maximum
power consumption of the loads must be less than the maximum power of the Sunny Island for a duration of 30 minutes
at 25°C.
Type of battery
backup system
Maximum power of the
Sunny Island for
30 min at 25°C
Sunny Island device type
Number of
Sunny Island
inverters
6 kW
SI6.0H-11 (Sunny Island 6.0H)
1
8 kW
SI8.0H-11 (Sunny Island 8.0H)
18 kW
SI6.0H-11 (Sunny Island 6.0H)
24 kW
SI8.0H-11 (Sunny Island 8.0H)
Single-phase
Three-phase
3
Short-Term Overload during Grid Failure
Short-term overload peaks of the loads can be compensated by the Sunny Island within its technical power limits (see
installation manual of the Sunny Island at www.SMA-Solar.com).
However, the DC cables from the Sunny Island to the battery fuse box and to the battery must be designed to withstand
this overload operation.
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SMA Solar Technology AG
6 Electrical Connection
6 Electrical Connection
6.1 Single-Phase Battery Backup System with All-Pole Disconnection
Schematic Diagram of the Automatic Transfer Switch
Figure 6:
Schematic diagram of the single-phase automatic transfer switch with all-pole disconnection (e.g. for Germany)
Planning Guidelines
SI-Ersatzstrom-PL-en-11
19
6 Electrical Connection
SMA Solar Technology AG
Circuitry Overview
Figure 7:
20
Circuitry overview of a single-phase battery backup system with all-pole disconnection (e.g. for Germany)
SI-Ersatzstrom-PL-en-11
Planning Guidelines
SMA Solar Technology AG
6 Electrical Connection
6.2 Three-Phase Battery Backup System with All-Pole Disconnection
Schematic Diagram of the Automatic Transfer Switch
Figure 8:
Schematic diagram of the three-phase automatic transfer switch with all-pole disconnection (e.g. for Germany)
Planning Guidelines
SI-Ersatzstrom-PL-en-11
21
6 Electrical Connection
SMA Solar Technology AG
Circuitry Overview
Figure 9:
22
Circuitry overview of a three-phase battery backup system with all-pole disconnection (e.g. for Germany)
SI-Ersatzstrom-PL-en-11
Planning Guidelines
SMA Solar Technology AG
6 Electrical Connection
6.3 Single-Phase Battery Backup System without All-Pole Disconnection
Schematic Diagram of the Automatic Transfer Switch
Figure 10: Schematic diagram of the single-phase automatic transfer switch without all-pole disconnection (e.g. for Australia)
Planning Guidelines
SI-Ersatzstrom-PL-en-11
23
6 Electrical Connection
SMA Solar Technology AG
Circuitry Overview
Figure 11: Circuitry overview of a single-phase battery backup system without all-pole disconnection (e.g. for Australia)
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SMA Solar Technology AG
6 Electrical Connection
6.4 Three-Phase Battery Backup System without All-Pole Disconnection
Schematic Diagram of the Automatic Transfer Switch
Figure 12: Schematic diagram of the three-phase automatic transfer switch without all-pole disconnection (e.g. for Australia)
Planning Guidelines
SI-Ersatzstrom-PL-en-11
25
6 Electrical Connection
SMA Solar Technology AG
Circuitry Overview
Figure 13: Circuitry overview of a three-phase battery backup system without all-pole disconnection (e.g. for Australia)
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SMA Solar Technology AG
7 Automatic Transfer Switch
7 Automatic Transfer Switch
7.1 Procurement of the Automatic Transfer Switch
You can order the automatic transfer switch as a complete switch cabinet unit.
Technical characteristics
Procurement
From enwi-etec GmbH:
Single-phase
Three-phase
With all-pole
disconnection
Article number
X
–
X
Order from enwi-etec GmbH or
set up independently
10010034
–
X
X
Order from enwi-etec GmbH or
set up independently
10010278
X
–
–
Set up independently
–
–
X
‒
Set up independently
–
It is also possible to procure the required devices of the automatic transfer switch from specialist dealers and to build the
switch cabinet independently.
No connection of loads and the PV system to the automatic transfer switch
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.
Dimensioning of the tie switch
Regardless of all-pole or non-all-pole disconnection, you must adjust the ampacity of the tie switch in accordance
with the local requirements (see Section 5.1 "Certifications and Licenses", page 12). The tie switch must be designed
for at least the tripping range of the upstream fuse or the maximum short-circuit current of the PV system.
7.2 Automatic Transfer Switch for Single-Phase Battery Backup System with
All-Pole Disconnection
Material List
The following table summarizes the configuration of the automatic transfer switch as suggested in the schematic diagram
for a single-phase battery backup system with all-pole disconnection (e.g. for Germany). You will need to procure the
material from your distributor.
Design of the devices in the automatic transfer switch
The indicated values for the devices are recommended by SMA Solar Technology AG. The electrical devices must
be designed in accordance with the locally applicable standards and directives.
Position Material
Number
of units
Description
F1
Circuit breaker for protection of the control and
measuring cables
1
16 A, B rating, 1-pole
F2
Residual-current device for control and measuring
cables*
1
40 A/0.03 A, 1-pole + N, type A
F3, F4
Circuit breaker for protection of phase coupling**
2
32 A, C rating, 1-pole
F5
Circuit breaker for protection of control cables
1
10 A, B rating, 1-pole
F6
Circuit breaker for protection of the Sunny Island
1
32 A, C rating, 1-pole
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7 Automatic Transfer Switch
Position Material
Number
of units
Description
F7
Residual-current device
1
40 A/0.03 A, 1-pole + N, type A
Q1
Contactor for grid disconnection
1
400 V, 63 A at AC-1, AC-7a, 4 no
Q2
Contactor for grid disconnection
1
400 V, 63 A at AC-1, AC-7a, 4 no
Auxiliary switch for feedback
1
1 nc
Contactor for grounding device
1
400 V, 40 A at AC-1, AC-7a, 2 no
2 nc
Auxiliary switch for Q1 locking mechanism
1
1 no
Q4
Contactor for grounding device
1
400 V, 40 A at AC-1, AC-7a, 2 no
2 nc
Q6
Phase coupling contactor**
1
400 V, 63 A at AC-1, AC-7a, 2 no
X1
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
‒
End clamp
1
Width: 10 mm
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
1
10 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
10 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
10 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
3
2.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
2.5 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
1
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
Q3
X2
X3
X4
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SMA Solar Technology AG
Position Material
X5
7 Automatic Transfer Switch
Number
of units
Description
3-conductor through terminal
4
1.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal (L)
1
6 mm², 1-pole, 3 contact points, gray
3-conductor through terminal (N)
1
6 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
2
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
* Required in TT grid configuration only
** Optional
Configuration Suggestion
Figure 14: Configuration suggestion for single-phase automatic transfer switch with all-pole disconnection (e.g. for Germany)
Planning Guidelines
SI-Ersatzstrom-PL-en-11
29
7 Automatic Transfer Switch
SMA Solar Technology AG
7.3 Automatic Transfer Switch for Three-Phase Battery Backup System with
All-Pole Disconnection
Material List
The following table summarizes the configuration of the automatic transfer switch as suggested in the schematic diagram
for a three-phase battery backup system with all-pole disconnection (e.g. for Germany). You will need to procure the
material from your distributor.
Design of the devices in the automatic transfer switch
The indicated values for the devices are recommended by SMA Solar Technology AG. The electrical devices must
be designed in accordance with the locally applicable standards and directives.
Position Material
Description
F1
Circuit breaker for protection of the control and
measuring cables
3
16 A, B rating, 1-pole
F2
Residual-current device for control and measuring
cables*
1
40 A/0.03 A, 3-pole + N, type A
F5
Circuit breaker for protection of control cables
1
10 A, B rating, 1-pole
F6
Circuit breaker for protection of the Sunny Island
3
32 A, C rating, 1-pole
F7
Residual-current device
1
40 A/0.03 A, 3-pole + N, type A
Q1
Contactor for grid disconnection
1
400 V, 63 A at AC-1, AC-7a, 4 no
Q2
Contactor for grid disconnection
1
400 V, 63 A at AC-1, AC-7a, 4 no
Auxiliary switch for feedback
1
1 nc
Contactor for grounding device
1
400 V, 40 A at AC-1, AC-7a, 2 no
2 nc
Auxiliary switch for Q1 locking mechanism
1
1 no
Q4
Contactor for grounding device
1
400 V, 40 A at AC-1, AC-7a, 2 no
2 nc
X1
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
‒
End clamp
1
Width: 10 mm
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
Q3
X2
30
Number
of units
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Planning Guidelines
SMA Solar Technology AG
Position Material
X3
X4
X5
7 Automatic Transfer Switch
Number
of units
Description
3-conductor through terminal
3
10 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
3
10 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
3
10 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
5
2.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
3
2.5 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
1
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
4
1.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal (N)
1
6 mm², 1-pole, 3 contact points, gray
3-conductor through terminal (L)
1
6 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
2
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
* Required in TT grid configuration only
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7 Automatic Transfer Switch
SMA Solar Technology AG
Configuration Suggestion
Figure 15: Configuration suggestion for three-phase automatic transfer switch with all-pole disconnection (e.g. for Germany)
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7 Automatic Transfer Switch
7.4 Automatic Transfer Switch for Single-Phase Battery Backup System
without All-Pole Disconnection
Material List
The following table summarizes the configuration of the automatic transfer switch as suggested in the schematic diagram
for a single-phase battery backup system without all-pole disconnection (e.g. for Australia). You will need to procure the
material from your distributor.
Design of the devices in the automatic transfer switch
The indicated values for the devices are recommended by SMA Solar Technology AG. The electrical devices must
be designed in accordance with the locally applicable standards and directives.
Position Material
F1
Number
of units
Description
Circuit breaker for protection of the control and
measuring cables
1
16 A, B rating, 1-pole
F3, F4
Circuit breaker for protection of phase coupling*
2
32 A, C rating, 1-pole
F5
Circuit breaker for protection of the phase coupling
control cable*
1
10 A, B rating, 1-pole
F6
Circuit breaker for protection of the Sunny Island
1
32 A, C rating, 1-pole
F7
Residual-current device
1
40 A/0.03 A, 1-pole + N, type A
Q2
Contactor for grid disconnection
1
400 V, 63 A at AC-1, AC-7a, 4 no
Auxiliary switch for feedback
1
1 nc
Q6
Phase coupling contactor*
1
400 V, 63 A at AC-1, AC-7a, 2 no
X1
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
‒
End clamp
1
Width: 10 mm
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
X2
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7 Automatic Transfer Switch
Position Material
X3
X4
X5
SMA Solar Technology AG
Number
of units
Description
3-conductor through terminal
1
10 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
10 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
10 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
3
2.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
2.5 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
1
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
4
1.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal (L)
1
6 mm², 1-pole, 3 contact points, gray
3-conductor through terminal (N)
1
6 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
2
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
* Optional
7.5 Automatic Transfer Switch for Three-Phase Battery Backup System
without All-Pole Disconnection
Material List
The following table summarizes the configuration of the automatic transfer switch as suggested in the schematic diagram
for a three-phase battery backup system without all-pole disconnection (e.g. for Australia). You will need to procure the
material from your distributor.
Design of the devices in the automatic transfer switch
The indicated values for the devices are recommended by SMA Solar Technology AG. The electrical devices must
be designed in accordance with the locally applicable standards and directives.
Position Material
34
Number
of units
Description
F1
Circuit breaker for protection of the control and
measuring cables
3
16 A, B rating, 1-pole
F6
Circuit breaker for protection of the Sunny Island
3
32 A, C rating, 1-pole
F7
Residual-current device
1
40 A/0.03 A, 3-pole + N, type A
Q2
Contactor for grid disconnection
1
400 V, 63 A at AC-1, AC-7a, 4 no
Auxiliary switch for feedback
1
1 nc
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SMA Solar Technology AG
Position Material
X1
X2
X3
X4
X5
7 Automatic Transfer Switch
Number
of units
Description
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
‒
End clamp
1
Width: 10 mm
3-conductor through terminal
3
16 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
1
16 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
3
10 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
3
10 mm², 1-pole, 3 contact points, blue
3-conductor through terminal
3
10 mm², 1-pole, 3 contact points,
yellow-green
End plate for through terminal, 3-conductor
1
‒
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
5
2.5 mm², 1-pole, 3 contact points, gray
3-conductor through terminal
3
2.5 mm², 1-pole, 3 contact points, blue
End plate for through terminal, 3-conductor
1
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
3-conductor through terminal
2
1.5 mm², 1-pole, 3 contact points, gray
End plate for through terminal, 3-conductor
2
−
Group marker carrier for end clamp
1
−
End clamp
1
Width: 10 mm
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7 Automatic Transfer Switch
SMA Solar Technology AG
7.6 Operating Principle of the Automatic Transfer Switch
Differences between automatic transfer switches for single-phase and three-phase battery backup
systems
This section describes the operating principle of the automatic transfer switch as exemplified by the single-phase
battery backup system with all-pole disconnection (see Section 6.1 "Single-Phase Battery Backup System with
All-Pole Disconnection", page 19).
• The function of the tie switch and grounding device of a three-phase automatic transfer switch is analogous to
that of the single-phase automatic transfer switch.
• In battery backup systems without all-pole disconnection, no grounding device is required.
• Phase coupling is only suitable for battery backup grids with single-phase PV inverters and single-phase loads.
Tie Switch with All-Pole Disconnection (e.g. for Germany)
The tie switch with all-pole disconnection comprises the contactors Q1 and Q2. The tie switch disconnects the battery
backup grid from the utility grid in the event of a grid failure or if the utility grid is outside the voltage and frequency
thresholds.
The control voltage of the contactors Q1, Q2 and Q3 is equal to the voltage at the line conductor L1 of the utility grid.
This means that the tie switch can only be activated when line voltage is present. The contactor Q3 controls the contactor
Q1. The contactors Q3 and Q2 are controlled by the multifunction relay Relay 1 of the Sunny Island. When the
multifunction relay Relay 1 is in non-operative mode, contactors Q2 and Q3 will be activated. If contactor Q3 is in
non-operative mode, contactor Q1 will also go into non-operative mode and be locked.
In the event of grid failure, contactors Q1, Q2 and Q3 go into non-operative mode due to lack of control voltage and
disconnect the battery backup grid from the utility grid at all poles. The Sunny Island also measures the voltage of the
utility grid. When a deviation from country-specific voltage and frequency thresholds of the utility grid occurs, the
multifunction relay Relay 1 is activated. The contactors Q1, Q2 and Q3 remain in non-operative mode or go into
non-operative mode.
When the utility grid is restored, this is detected by the Sunny Island. The Sunny Island synchronizes the battery backup
grid with the utility grid. Following successful synchronization, Relay 1 goes into non-operative mode and contactors Q2
and Q3 are activated. Contactor Q3 unlocks contactor Q1 and Q1 is activated. The battery backup grid is again
connected to the utility grid.
Tie Switch without All-Pole Disconnection (e.g. for Australia)
The tie switch without all-pole disconnection comprises the contactor Q2. The tie switch disconnects the battery backup
grid from the utility grid in the event of a grid failure or if the utility grid is outside the voltage and frequency thresholds.
The control voltage of contactor Q2 is equal to the voltage at the line conductor L1 of the utility grid. This means that the
tie switch can only be activated when line voltage is present. Contactor Q2 is controlled by the multifunction relay
Relay 1 of the Sunny Island. When Relay 1 is in non-operative mode, contactor Q2 is activated.
In the event of grid failure, contactor Q2 is deactivated due to lack of control voltage and disconnects the battery backup
grid from the line conductors of the utility grid. The Sunny Island also measures the voltage of the utility grid. When a
deviation from the country-specific voltage and frequency thresholds of the utility grid occurs, the multifunction relay
Relay 1 is activated. Contactor Q2 remains in non-operative mode or goes into non-operative mode.
When the utility grid is restored, this is detected by the Sunny Island. The Sunny Island synchronizes the battery backup
grid with the utility grid. Following successful synchronization, Relay 1 goes into non-operative mode and contactor Q2
is activated. The battery backup grid is again connected to the utility grid.
Grounding Device
Contactors Q3 and Q4 form the grounding device. Contactors Q3 and Q4 are controlled by both multifunction relays
of the Sunny Island. Contactor Q3 is activated in parallel to contactor Q2 of the tie switch. When the tie switch is closed,
contactor Q3 connects the neutral conductor in the battery backup grid to the grounding conductor.
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7 Automatic Transfer Switch
In addition, the Sunny Island uses the multifunction relay Relay 2 to control contactor Q4. When the multifunction relay
Relay 2 is activated, the contactor Q4 is activated and also connects the neutral conductor to the grounding conductor.
This arrangement ensures that the neutral conductor of the battery backup grid is always connected to ground.
Phase Coupling
Contactor Q6 is the phase coupler. When the multifunction relay Relay 2 is activated on the Sunny Island, this activates
contactor Q6 and connects the unsupplied line conductors via circuit breakers F3 and F4 with the supplied line
conductor.
Planning Guidelines
SI-Ersatzstrom-PL-en-11
37
8 Installation Site
SMA Solar Technology AG
8 Installation Site
The following products within the SMA Flexible Storage System with battery backup function impose requirements on the
installation site which must be taken into account at the planning stage.
• Sunny Island 6.0H/8.0H with battery
• Sunny Remote Control
• BatFuse B.01/B.03
• SMA Energy Meter
• Sunny Home Manager
The requirements made on the installation site of the automatic transfer switch are listed in the manufacturer
documentation of the switch cabinet and its components.
With reference to the entire battery backup system, the following requirements should be taken into account from the
initial planning stage:
☐ The minimum clearances to walls, objects, SMA products or other technical devices must be complied with.
☐ The ambient conditions must meet the requirements of the individual products towards the installation site.
☐ The maximum cable routes and radio ranges between the installed SMA products to one another and to other
devices must be feasible.
☐ The cable cross-sections and the conductor materials of the cables used must meet the requirements of the specified
products.
☐ The battery room must meet the requirements of the battery manufacturer.
Links to additional information can be found at www.SMA-Solar.com:
Document title
Document type
Sunny Island 6.0H/8.0H
Installation Manual
Sunny Remote Control
Mounting Instructions
BatFuse
Installation Manual
SMA Energy Meter
Installation Manual
Sunny Home Manager
Installation Manual
38
SI-Ersatzstrom-PL-en-11
Planning Guidelines
SMA Solar Technology
www.SMA-Solar.com
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