11 Troubleshooting
SMA Solar Technology AG
Operating manual STP50-40-BE-en-15 99
Location of the ground fault
The example shows a ground fault between the second and third PV module.
+
100 V 100 V 100 V 100 V 100 V
V = 200 V
1
V = 300 V
2
Test by Measuring the Insulation Resistance
If the voltage measurement does not provide sufficient evidence of a ground fault, the insulation
resistance measurement can provide more exact results.
Figure 18: Schematic diagram of the measurement
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