Hello, I threw together a diy electric bike kit (48v) with a gel lead acid pack. I have a voltmeter that I can change to show either percentage or voltage. I know a fully charged pack is ~53.4 volts with no load and 42 volts no load should be completely discharged but under load fully charged it wobbles around 50v and goes as far as ~40v under high load when it about to give up but with 40v under load it shows ~48 volts with no load and that's about 60% if you switch the gauge to display percentage.
My question: should I calculate my state of charge under load (driving) or should I do it under no load? I guess I can run it down to 42v with low amp draw. but it doesn't wanna give the 22amp my controller wants ands drops below 40v so I guess 47-48v no load = empty?( atleast empty enough to not be able to give the power to the wheels)
Update: just did a real world test until it was basically empty. It reads 38.9v at high load up a hill(dangerously low?) the controller cuts the power from time to time at this point. It reads 50.3 with no load. Why the huge voltage drop?
