Yes, 40 inputs. BMS usually come with inputs in sets such as 8 or 16, so you get the one with at least 40 channels and leave the extras unused.I am wondering where to find a BMS for a 144v pack. I am using 40 cells in series, so I need to monitor every cell right? Do I need a BMS with 40 inputs?
There are debates about how necessary cell-level monitoring is, but every production EV does it, which I think is a strong hint.
You also need the BMS to be set up for the specific voltages for your cells (LiFePO4 voltages are significantly lower than other lithium-ion chemistries, for instance).