question

tony-from-west-oz avatar image
tony-from-west-oz asked

My VictronMultiPlus-II 48/5000/70 occasionally trips my BMS (Overcurrent) under light load.

I have a problem with my Victron inverter. Occasionally, at low load (overnight usually) it trips off the BMS due to "Overcurrent". The BMS shows a current of 352.2A.The 100A Battery fuses are not affected, The FETs in the BMS are faster than the battery HRC fuses.

When reset, the BMS has a charge delay to prevent excessive inrush current into loads, but after this delay, the BMS may trip on "Overcurrent" again. After a while, the inverter will start normally with no problems from the BMS protection system when reset.

I was advised that some Victron inverters had a similar issue which was a common issue for that production batch..
How can I check if my inverter is part of that batch, so I can get it repaired/replaced?

Thanks in advance.


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3 Answers
tony-from-west-oz avatar image
tony-from-west-oz answered ·

20230914-1007571.jpgJust to aid investigation,here is a photo of the ID sticker on the inverter.


20230914-1007571.jpg (2.5 MiB)
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snoobler avatar image
snoobler answered ·

Do you have anything with high surge like a well pump?

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tony-from-west-oz avatar image tony-from-west-oz commented ·
No high surge loads. No heavy loads when it trips off. Usually in the early morning 3-5am. I wake up because my CPAP machine stops working.



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tony-from-west-oz avatar image
tony-from-west-oz answered ·

After getting help from a local Perth member, I now have the generator able to connect and carry the load / recharge the battery.


It is interesting to note that the BMS over current trip has not occurred since this intervention.
No changes were made to the 48V system or the inverter, other than limiting the generator current to the inverter, then relaxing it to allow the full generator output ( 7.5KVA) to be used by the inverter/charger.


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Related Resources

Faults with Victron equipment are best discussed directly with your dealer - this can be formalised with this support request form.