There is one thing bugging me... the typical values for cut-offs that "simple" BMS manufacturers set. Just got a message from a BMS Company and he said the cell cut offs were 2.2 V (low) and 3.75 V (high).... Those seem quite extreme! I've never seen anybody recommend (and this seems to be supported by most charge/discharge curves) going below 2.5 V or above 3.65 V (and some recommend even more conservative 2.9 and 3.5 V, which would likely still give you over 90-95% capacity).
I also asked about the low-T charge cut-off and he said it was set to -7 C. This is again WAY TOO LOW, isn't it?
I mean, the BMS is supposed to manage the batteries, but with those values it seems they'd be really pushing them to the brink of destruction...
I am planning to design my own cell monitoring system that would shut-off the large consumption part (i.e., inverter) but I really need the BMS to do its job keeping the charging reasonable and disconnecting things (for the low-current use devices) if the voltage of any cell goes below 2.5V... 2.2V? 3.65V? -7C? These numbers appear crazy, no?
Carlos