As mentioned above, your BMS is not functioning properly if it let you drive any cells lower than 2.5v.
also, and sorry if this is dumb, but you never mention charging voltages. It almost sounds like you noted the batteries at 3.2v per cell and called them charged. Generally when sold, these cells will have 50% charge or less, at higher states of charge (and temperature) they lose life faster.
They will not be close to fully charged unless you get them up to at least 3.45-3.5v per cell. After that, they will come back down to a resting voltage of about 3.2-3.3, depending on several factors including temperature and condition. Going to 3.65 regularly is hard on them, I go to about 3.55, which does not fully charge them unless I do it at low amperage, but that is an open debate with a lot of detail and opinion. 3.4-3.6 is reasonable. Make sure your solar charging doesn’t raise it to 3.6 and hold it there indefinitely, that will kill them too.
there are BMS that you can adjust parameters like max voltage, min voltage, balance voltage, etc.
also, and sorry if this is dumb, but you never mention charging voltages. It almost sounds like you noted the batteries at 3.2v per cell and called them charged. Generally when sold, these cells will have 50% charge or less, at higher states of charge (and temperature) they lose life faster.
They will not be close to fully charged unless you get them up to at least 3.45-3.5v per cell. After that, they will come back down to a resting voltage of about 3.2-3.3, depending on several factors including temperature and condition. Going to 3.65 regularly is hard on them, I go to about 3.55, which does not fully charge them unless I do it at low amperage, but that is an open debate with a lot of detail and opinion. 3.4-3.6 is reasonable. Make sure your solar charging doesn’t raise it to 3.6 and hold it there indefinitely, that will kill them too.
there are BMS that you can adjust parameters like max voltage, min voltage, balance voltage, etc.
I have used active balancers to get all
cells more or less balanced and had good luck.
anton
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