MultiPlus voltage fluctuations

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alacrity asked Sep 12, '23

MultiPlus voltage fluctuations

MultiPlus 2KVA 120V with remote control panel.

Installed this past spring; everything worked fine for four months. I was out of the country for three weeks; when I got back to the boat and turned the inverter on it was only providing 102V AC (previously it was about 120-122). As soon as I supply a load it starts wildly fluctuating between 80V and 128V. Any significant load trips the overload.

Connecting to shore power or running the generator both work fine.

Any possibility I can reset the inverter somehow?

Multiplus-II

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Answer 1 · 2023-09-12T06:56:00Z

Alexandra answered · Sep 12, 2023 at 06:56 AM

@Alacrity

First port of call is an ac wiring and connection check.

(But more thorough would be a whole system check).

Settings don't change, what does change is the physical install.

How are your batteries?

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Answer 2 · 2023-09-12T15:59:07Z

alacrity answered · Sep 12, 2023 at 03:59 PM

Batteries are good; can run everything (fridge, freezer, electronics, etc.) except the inverter.

I don't know how the wiring could have suddenly gone bad, but I will check that next.

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Answer 3 · 2023-09-25T14:55:26Z

alacrity answered · Sep 25, 2023 at 02:55 PM

Measured the voltages at the connections on the Multiplus:

DC input is 13.6v.

AC output is 102v with no load. Any load causes the wild fluctuation in AC voltage output.

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