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h2009 avatar image
h2009 asked

Plyontec Batteries - any issues keep charge levels between 20-60% long term?

Hi everyone, quick question, is there any issues with not charging my batteries to 100%? I normally charge them to a maximum of 60%. Now I’m using D ESS that does very little bit more.

battery chargingLithium Battery
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2 Answers
kevgermany avatar image
kevgermany answered ·

They need a regular full charge so the BMS can balance the cells. Failure to do this can lead to permanent damage.

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kenzo avatar image kenzo commented ·
Can you expand on the nature of permanent damage? There appear to be plenty of cell vendors that recommend SOC < 100% so that would be interesting to understand better.
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daza avatar image daza kenzo commented ·
@kenzo Loss of cell capacity or Loss of cell/cells itself
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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @h2009,

The main issue I would expect is that the state of charge becomes less accurate over time.

I would do a manual recharge to 100% once a month or so.

That process would also give you hints if the battery cells are going out of balance over time (as the battery will not reach 100% until they are pretty close).

Lithium batteries are far more tolerant of cycling anywhere in their 'safe range' between 10%~90% than lead acid, but old habits die hard :)

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