question

outofthenorth avatar image
outofthenorth asked

Why is my Multiplus inverting but not charging?

I have a Multiplus 12/3000/120. It works well as an inverter but when I plug it into 15A shore power, it does not charge my two 206Ah LiFePO4 batteries. I also have an Orion DC-DC charger and a SmartSolar MPPT and I have been using them successfully to charge my batteries but when I try to use the charging function of the Multiplus, the "Mains On" light flashes to tell me that "the AC output current is equal to the preset maximum input current."

I have tried setting my maximum input current to different values but that does not change the situation.

Can anyone give me insight?

battery charging
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3 Answers
outofthenorth avatar image
outofthenorth answered ·

I connected the MC3 and went through every single setting and it turns out that the conditional AC input control was activated. I read on the Victron website the default is for it to be deactivated so I turned that feature off and immediately my batteries started charging through the inverter. Not sure how that got turned on but I am thrilled that the problem seems to be solved.
Thanks so much for your help.

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snoobler avatar image
snoobler answered ·

The charger can be turned off. Can you access the unit through Victron Connect or VEConfig?


Given the error message, if you draw more current than the AC-input limit is set to, you will not get charging.


The same transformer is used for both charging and inverting. The unit can't invert on the output and charge separately from the input. It's passing through the AC-in to loads and charging with surplus.

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Hmmm, there's a lot to consider in your answer.

I'm using Victron Connect to communicate with my devices.

The only load using current are my 12V batteries, there was no AC load.

I had switched the unit to "Charge only" when I got the error.

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snoobler avatar image
snoobler answered ·

Ah... you likely need to limit your CHARGE current, so that it doesn't overload the AC input.


Try reducing your CHARGE CURRENT to something conservative, around 30A. If this works, keep increasing until it stops, then back off.


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