How to measure the grounding of photovoltaic panels
Disconnect the DC switch of each PV string connected to the inverter, and use a multi-meter to measure the voltage of the PV+ to ground and PV- to ground of each string.
Disconnect the DC switch of each PV string connected to the inverter, and use a multi-meter to measure the voltage of the PV+ to ground and PV- to ground of each string.
Check the PV system for ground faults by measuring the voltage. If the voltage measurement was not successful, check the PV system via insulation resistance measurement for ground faults.
Follow the below steps on how to inspect the grounding system regularly:Use a voltmeter or other similar device to test the continuity between the grounding rod and the solar panel array.If there is no continuity, check all connections and make sure they are tight and free of any oxidation.
How to test energized DC PV string circuits with ground faultsUnderstand expected values before you begin Before testing to identify the location of a ground fault, you need to know what measurement values to expect — specifically voltage. De-energize and lockout/tagout (LOTO) where you're working . Inspect the PV array visually . Test for current on each string first, then open fuse holders . Test PV string voltage .
Using a digital multimeter (DMM), technicians should measure voltage from positive to negative, positive to ground, and negative to ground.
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