question

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mark-august asked

Victron multiples 12/3000/120-50 120v — neg and pos battery terminal connected? - 2 ohms

Testing the terminal connectors shows ac side ok, but a connection btween + plate and - plate where 12 volt batteries should connect of approx 2 ohms? Should this be here and will it be ok to hook it up and turn on?

MultiPlus Quattro Inverter Charger
2 |3000

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1 Answer
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wkirby answered ·

There is a large bank of capacitors at the front end of these devices. A regular Ohm meter will show a short circuit or close to a short circuit when the capacitor bank is empty.
If you leave the Ohm meter connected for a while, the impedance (resistance) should increase over a few minutes as the Ohm meter it's self charges the capacitors up.

It's quite normal to see a big spark when initially connecting up the battery to the MultiPlus. If you don't like sparks, then precharge that capacitor bank through a high power ~10Ω resistor.

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mark-august avatar image mark-august commented ·

Thank you so much Wkirby, I thought the device had some kind o rectifier, with coils, I just needed some guidance, again thank you.

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