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Electrical Connection
5.4.4 Connecting the PV Array (DC)
DANGER!
Danger to life due to high voltages in the inverter
• Before connecting the PV array, ensure that the miniature circuit-breaker is switched
off.
NOTICE!
Excessive voltages can destroy the measuring device.
• Only use measuring devices with a DC input voltage range up to at least 1 000 V.
1. Disconnect the miniature circuit-breaker and secure against reconnection.
2. If an external DC switch-disconnector is present, disconnect the external DC switch-
disconnector.
3. If an Electronic Solar Switch is installed, pull the
Electronic Solar Switch downwards, slightly
towards the wall.
4. Check the connection cables of the PV modules for
correct polarity and make sure that the maximum
input voltage of the inverter is not exceeded.
At an ambient temperature above 10°C, the open-
circuit voltage of the PV modules must not be more
than 90% of the maximum inverter input voltage.
Otherwise, check the plant design and the PV module
circuitry. If this is not done, the maximum inverter
input voltage can be exceeded at low ambient
temperatures.
32
SB25-30-IA-en-51
SMA Solar Technology AG
Installation Manual
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