Multiplus-II Charging Battery Issue

DIY
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1

Hello everyone,

I’m facing the following issue:
My inverter is only charging the batteries from shore power at 150W. I have correctly configured the Multiplus for the right battery type, but strangely it doesn’t charge with full power. Currently, the batteries are at 31.3% state of charge. (Previously, they were unfortunately over-discharged, reaching a cell voltage of 2.74V, which triggered the battery pre-alarm.)

Now I don’t understand why the Multiplus isn’t charging the batteries at its full capacity of 120A.

Unfortunately, I can’t find a comprehensive guide for setting up the entire system (I have already attended a Victron training, but it barely covered the software configuration).
I would really appreciate any help or tips you can offer!

System setup (installed in an RV):

  • Multiplus II 12/3000 (wired with 2x 50mm² cables)
  • Lynx Distributor
  • Lynx Smart BMS
  • 2x 200Ah LiFePO₄ Smart Batteries
  • Cerbo GX
  • Orion XS

Thanks and best regards,
Sven

2

Use firmware v556, deselect weak power and ups.

Try again, good luck

But ofc it might be your MP is managed by the lynx bms and cerbo ??

3
  • Firmware v556 for Cerbo GX or Multiplus II?
  • Where can I deselect this? In Venus OS on the Cerbo or in Victron Connect?
  • MP is managed by lynx BMS
4

Multiplus

In Venus you should be able to deselect the charger management, or, for a first try, just disconnect the MP from cerbo it let it run as stand-alone, go on from there step by step…

5

In the settings of the MultiPlus via VE.config but “weak AC input” is disabled by default.

Add some screenshots from your settings.