The proper way to read state of charge of a bank of flooded lead acid batteries, other than checking the s.g., is to read the open circuit voltage. That I know. But what about when there is a load on the batteries? Do I simply have to shut down the controller to take a reading, or is there another way? Also, if I want an analog panel type voltmeter to read open circuit state of charge, could I add a series resistor to make the scale zero out at the zero charge voltage, and a parallel resistor to make the 100% charge voltage read full scale on the meter?
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