So I'm wanting to make a lead acid BMS system. The system would be composed of probably 5-10 batteries to expand to more if I need/want to. I want to measure each battery voltage and temp individually. I then want to output that serially on a per battery basis. This will then go into either one multiplex or some end controller I haven't decided yet. My main concern though is figuring out how to design the BMS becuase I never have before so i'm looking for some help/direction. The large caveat to this is that I want to find a way to do it without having a true ground, or is this even possible? Thanks guys.