Calculating the insulation resistance

The expected total resistance of the PV system or of an individual string can be calculated using the following formula:

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The exact insulation resistance of a PV module can be obtained from the module manufacturer or the datasheet.

For the resistance of a PV module an average value can be assumed: for thin-film PV modules approximately 40 MOhm and for polycrystalline and monocrystalline PV modules approximately 50 MOhm per PV module.

    Also see:

    Event 9038
    Checking the PV System for Ground Faults