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geordy asked

MultiPlus 12/800/35 overload alert with no load connected

Hi There,

just bought a MultiPlus-II 12/800/35 for a small installation in my planned camper.

Today i wanted to test the device but MP-II shows an overload alert when cutting of AC power an switching to inverter mode.

It's just a testbuild with a LiTime 100Ah LiFePo4 battery and no other device connected.

Updated firmware to v502 and used VictronConnect via MK3-USB-Adapter to check configuration an alert messages.

AC throughput works.

Charger starts in bulk mode but with 0A and does not change to absorption or float.

Battery fully charged an voltage is at 13,55V. No powerloss between battery an MP-II connectors. Cables (25mm²) are short with a mega fuse and mainswitch to cut off battery connection.

Configured MP-II via VoctronConnect to LiFePo4 and checked voltage settings.

Missing informations?

Any hint is welcome!

Multiplus-II
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Alexandra avatar image Alexandra ♦ commented ·

@geordy

Overload on grid outage is usually LOM detection or voltage disconnect related.

What inverter do you have exactly; I am not aware of the model of MP2 you are talking of?


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geordy answered ·

@Alexandra


Just wanted to give some feedback.


After giving up testing the MultiPlus, I was playing with my CaravanControl Unit. With these tests battery was discharged by around a quater.

Next day I wanted to doublecheck all checks from Pre-RMA-Checklist you mentioned. I could not belive it, after every parts were connected again, MultiPlus stayed in inverting mode, with no alert.

Connected AC to fully reload battery. Then disconnected AC again resulting in an overload alert.

That after I decided to discharge battery again to doublecheck that it's not a battery problem, even if there never had been a battery voltage alert.

Discharged a third (just guessing) and tested again. MultiPlus started inverting without alert. Fully charged again ... No alert after disconnecting AC. Tested with higher loads while inverting and charging.

Next 2 days I fully charged and partly discharged batter again, never again MultiPlus showed an alert. Changed from passthrough to inverting, loaded battery (bulk, absorption, float).

Inverting works as espected with connected load.

I really can't say where the problem was located maybe battery, maybe not.

I'm happy it works and hope it stays in this condition after nearly three weeks of testing.

Thank you for helping me!

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Alexandra avatar image Alexandra ♦ commented ·

@geordy

The battery was on the suspect list.

But glad it is sorted now.

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