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6 Electrical Connection
SMA Solar Technology AG
Operating manualSBxx-1AV-41-BE-en-1034
NOTICE
Damage to the DC connectors due to the use of contact cleaner of other
cleaning agents
Some contact cleaners or other cleaning agents may contain substances that decompose the
plastic of the DC connectors.
Do not use contact cleaners or other cleaning agents for cleaning the DC connectors.
NOTICE
Damage to the inverter due to ground fault on DC side during operation
Due to the transformerless topology of the product, the occurance of ground faults on DC side
during operation can lead to irreparable damage. Damages to the product due to a faulty or
damaged DC installation are not covered by warranty. The product is equipped with a protective
device that checks whether a ground fault is present during the starting sequence. The product is
not protected during operation.
Ensure that the DC installation is carried out correctly and no ground fault occurs during
operation.
Procedure:
1. Ensure that the circuit breaker is switched off and that it cannot be reconnected.
2. If an external DC load-break switch is installed, disconnect the external DC load-break switch
from all voltage sources.
3. Set the DC load-break switch of the inverter to
position O.
4. Measure the PV array voltage. Ensure that the maximum input voltage of the inverter is
adhered to and that there is no ground fault in the PV array.
5. Check whether the DC connectors have the correct polarity.
If the DC connector is equipped with a DC cable of the wrong polarity, the DC connector must
be reassembled. The DC cable must always have the same polarity as the DC connector.
6. Ensure that the open-circuit voltage of the PV array does not exceed the maximum input
voltage of the inverter.
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