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franko avatar image
franko asked

Multiplus Compact 12/2000/80-30 tripping shorepower when charging

I recently installed the Multiplus, MPPT 100/30, Digital multi control panel, battery monitor and solar panels to boost my existing solar capacity.

It all works well until I connect to shore power. It then trips the shore power RCD if I turn on the charger. If I leave the boats 240v charger circuit breaker off I can run everything else while connected to shore power. As soon as I switch the charger circuit breaker on, 15 seconds later the shorepower RCD trips. Advice appreciated.

Further, If I disconnect the 230v AC output terminals from the multiplus, the shore power RCD does not trip and the batteries charge. Is this a MEN problem @Guy Stewart (Victron Energy Staff)? I've triple checked the wiring is as per the Victron manuals.

MultiPlus Quattro Inverter Chargershorepowermultiplus compact
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Guy Stewart (Victron Community Manager) avatar image Guy Stewart (Victron Community Manager) ♦♦ commented ·

Hi Franko,

As per the new community guidelines, I will give the community some time to answer this one before I get into it.

RCD's tripping could be MANY things, including a partial existing wiring fault that the ground relay contact in the Multi is exacerbating. Have a look at this draft document:

Wiring Unlimited - Grounding, Earth Leakage and RCD

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franko answered ·

Problem solved. For other novices, I previously had a charger only which was removed and replaced by the multiplus. I used the same cable from the boat switchboard to feed the new multiPlus instead of running shore power (which supplied the switchboard) directly to the multiPlus and using the multiplus output to feed the switchboard. Doh!

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boekel avatar image boekel ♦ commented ·

Ah...looks like you got away lucky...AC on the output of an inverter can kill it (have heard of two cases).

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