SMA SI 3.0-11 Quick Reference Guide V.3.0 - Manual (Page 9)

SMA Solar Technology AG 2 Safety
Installation - Quick Reference Guide Ersatzstrom-IS-en-30 9
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.
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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.