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lennon avatar image
lennon asked

Victron Quattro 12/3000/120 turns off occasionally

Hi,


Ive had the Victron Quattro 12/3000/120 for about 3 years now. I bought it togehter with AGM batteries back then. Ive never had any issues.


I recently upgraded to LiFePO4 batteries and starting having an issue where suddenly at random without any warning or errors the 240 electricity goes off and when I look at the DMC all lights go off. This lasts for a couple of seconds and then everything turns on again like nothing ever happened. This happens like once or twice in a week. There is nothing specific that I suddenly turn on or off.


Any ideas what might be causing this?

Thanks in advance.

MultiPlus Quattro Inverter Charger
2 |3000
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1 Answer
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snoobler answered ·

Some LFP batteries behave erratically if single cell over-voltage protection (OVP) is triggered. It's very common for new LFP batteries to have imbalanced cells where one cell hits peak voltage before the others. This triggers over-voltage protection.

Try reducing your absorption voltage to 13.8V with a 2 hour absorption period. This should still allow you to get fully charged, but it should reduce/eliminate any OVP events.


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lennon avatar image lennon commented ·
Hi Snoobler,


Thanks so much for your quick reply! that sounds logical indeed. The LFP manufacturer stated absorbtion volt should be at 14.4. Should i lower that all the way to 13.8 then?


Thanks!

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snoobler avatar image snoobler lennon commented ·

If I'm right, yes. Absorption at 14.4V requires almost no absorption time... maybe 15 minutes. Absorption at 13.8V will still get to 100%, you just need more time at that voltage - 2 hours. If you find you're still charging with significant current at the 2 hour mark, increase to 3-4 hours.

This increased absorption time will also give the BMS more time to balance the cells.

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