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SMA Solar Technology AG Troubleshooting

Installation Guide SB25_30-IEN092520 37

The approximate position of the ground fault can be determined from the ratio of the measured

voltages between plus against ground potential and minus against ground potential.

Example:

The ground fault is between the second and third module in this case.

3. Repeat step 2 for each string.

The table illustrated below shows the various results and corresponding measures.

☑ The ground fault check is finished.

Result Measure

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 Sunny Boy.

•Do not reconnect the faulty string.

• Close and commission the Sunny Boy as described

in section 7.2 "Closing the Sunny Boy" (page33).

You have found no ground fault. It is likely that one of the thermally monitored varistors is

defective.

• Check the varistors as described in section

9.1.2 "Checking the Function of the Varistors"

(page38).

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PV Powered 2500 Installationsanleitung Seite 37