Earth Loop Impedance for Multiplus 48/10000

Off grid set up with multiplus 2 48/10000 connected to consumer unit that go to ring main sockets. When testing for earth loop impedance with a simple socket tester, it says the impedance is too high. No value just an LED. What should the earth loop impedance be for an inverter? Clearly its not the same as the low impedance offered by the grid. Is this a normal situation for off grid?

2 |3000

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Alexandra ♦ commented · Apr 01, 2023 at 06:07 PM

@raj.khabra2@btopenworld.com

How have you wired up for your offgrid setup?

Earth neutral bonded in the consumer unit?

How is the inverter hooked up to the earth?

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rajkhabra2 Alexandra ♦ commented · Apr 01, 2023 at 06:56 PM

Earth and neutral bonded just before the consumer unit the same as grid supply would have been. Earth rod connected. Earth to multiplus taken at consumer unit. My question is can an inverter ever be as low impedance as the grid?

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Alexandra ♦ rajkhabra2 commented · Apr 01, 2023 at 07:39 PM

Are you testing from the output of the inverter?

https://community.victronenergy.com/questions/181262/relying-on-earth-rod-in-off-grid.html

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Mike Dorsett rajkhabra2 commented · Apr 01, 2023 at 10:20 PM

Yes, the inverter should be almost as low impedance as the grid - as with the earth -neutral bond in the consumer unit, this link sets your earth -neutral impedance. This should be <1 ohm, and you can test this with a normal continuity tester - with the AC off. The inverter has a relay to provide E-N link when inverting from battery and ac in is disconnected. This relay can be disabled in inverter set up, so make sure that this has not been done.

With AC on, the Earth - Neutral ac voltage should be <200mV.

BTW, you should not have an "Earth Loop' !!

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