Multiplus II and two Phoenix IP43 parallel charging == #18 overcurrent

Q&A and troubleshooting
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1

When I use two Phoenix ip43 50a chargers alongside Multiplus ii to recharge my lithium battery bank through genset, both Phoenix chargers fail with #18 overcurrent error. When I only use two of them, without multiplus II, they work fine

Reducing current to about 30amp each improves the situation, but they always balance on the edge of working and failing.

I am assuming that it is tripping from existing large current flow on the wire, so I am considering installing 55AMP diodes on the output of the Phoenix controllers to make it stop. Thoughts?

Any other suggestions?

2

when you use all 3, are you exceeding the max permitted charge current of your battery?

3

I don’t think so. My 1200ah bank should be able to absorb way more then 220A. My bank is not managed by Victron bms. Is there a configuration somewhere that sets this limitation?