SMA SUNNY BOY 3.8-US - Page 69

6 Troubleshooting
SMA Solar Technology AG
User Manual SBxx-US-1XP-41-BA-en-11 69
Location of the ground fault
The example shows a ground fault between the second and third PV module.
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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.
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Figure 4: Schematic diagram of the measurement