If I read the specs correctly, the slave boards are supplied independently by 12V power. I like this. No parasitic draw for individual cells for the BMS slaves. I don't like the "18V to 75V" (DC?) input for the BMS master board, though, for an automotive application. If I were use this system, I'd have to get a DC-DC converter just for the BMS master. What current draw will the master board have?