Example: Location of the ground fault
The example shows a ground fault between the second and third PV module.
3. If a definite ground fault cannot be measured and the message is still displayed, measure the
insulation resistance.
4. Reconnect the strings without ground fault to the inverter and recommission the inverter (see
Section9, page33).
Test by Measuring the Insulation Resistance
If the voltage measurement does not accurately indicate a ground fault, the insulation resistance
measurement can provide more detailed results.
Figure 1: Schematic diagram of the measurement
5 Checking the PV System for Ground Faults
SMA Solar Technology AG
Service Manual 27SB36-50SE-SG-en-10
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