SMA Solar Technology AG Failure Search
Installation Guide SB20_25_30HF-IEN102911 75
☑ If the voltages measured are stable and the total of the voltages from the plus pole against
ground potential and the minus pole against ground potential of a string roughly
corresponds to the voltage between the plus pole and minus pole, then there is a ground
fault.
The approximate position of the ground fault can be determined from the ratio of the measured
voltages between the plus pole against ground potential (PE) and the minus pole against
ground potential (PE).
Example
In this case, the ground fault is between the second and third PV module.
☑ The ground fault check is finished.
Result Action
☑You have found a ground fault. • The installer of the PV generator must
remedy the ground fault in the affected
string before you may reconnect the string
to the inverter.
•Do not reconnect the faulty string.
• Re-commission the inverter as described in
section 7”Commissioning” (page52).
☑You have found no ground fault. It is likely that one of the thermally monitored
varistors is defective.
• Check the function of the varistors as
described in section 11.2”Checking the
Functioning of the Varistors” (page76).
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