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 (for further information on calculating the insulation resistance see the Technical Information "Insulation Resistance (Riso) of Non-Galvanically Isolated PV Systems" at www.SMA-Solar.com).

    Also see:

    Restoring the password without product key
    Checking the PV System for Ground Faults