Hello everybody,
I have an offgrid system, running for 1 year, made of a 8kWh BYD LVS battery, a MPPT RS450-100, and a Multiplus II 5000 VA.
Everyday, after the battery reaches 100%, I observe a strange increase of the max cell voltage, during hours :
Is it normal ? Does anyone have an idea of what happens ? The BMS should be balancing the cell's voltage instead, no ?
Thank you very much for your help
Are you getting any battery warnings?
If not then don't stress about it.
The system is rebulking the batteries during sunny hours which is also normal. And it is staying within the request 56.5v of the bms cvl. So also normal.
I have seen the 3.6v on quite a few different BYD systems. They seem to allow it in software.
Sometimes the graphs render a bit strange when zoomed out so much. Look at a 24 hour period at a time.
Thank you for your answer
Yes I get high voltage warnings, once per day, several day per month, when the battery reaches 100%, like this one :
I made a zoom in the curves :
So it's normal if the difference increases after the 100% ? I don't understand why, some cells are left on the side by the BMS while others continue to gain voltage, even after complete charge ?
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