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villychr avatar image
villychr asked

Multiplus II: trips battery (no load)

I am installing a (new out of the box) Multiplus II 12/3000 on my boat. I have only connected the DC plus and minus (in order to setup the Multiplus before connecting AC). As soon as I connect the DC breaker, the Multiplus trips the battery shortcut protection. The Multiplus on/off switch is off when this happens.

Any ideas?

Thanks,

Villy

PS. It's not reverse polarity.

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1 Answer
JohnC avatar image
JohnC answered ·

Hi @villychr

This will be the Multi filling it's capacitors. They're large and take quite a hit.

If you have a spare 12V Pb battery handy, try jumpering it across to precharge them, then switch in your main battery. Usually comes with a spark.

If you're going to do this regularly you could arrange a precharge circuit, Some Li battery makers even have such in their product range, but it's just a resistor really.

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villychr avatar image villychr commented ·
Hi @JohnC, thanks. I connected the multiplus to a start battery, it held the voltage OK. Waited about five minutes but the inverter LED didn't come on (which I presume they should), and the Multiplus (Bus-connected) didn't show up in Victron Connect local). How long does it take to fill the capacitors?

With thanks

Villy

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JohnC avatar image JohnC ♦ villychr commented ·
@villychr

A precharge done that way only takes the spark. Quick.

Does your bms need resetting or something? V on the Multi terminals? I don't know, you'll have to delve..

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MultiPlus-II Product page 

MultiPlus-II Manual

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VE.Bus Error codes

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