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Solar Info - Batteries You can get an idea of the state of charge of your battery by measuring its off-load voltage and consulting the following table: Battery State of Charge

State of Charge (approx.)

Volts per cell

12 V Battery

24 V Battery


1

2.12

12.72

25.44


90%

2.08

12.48

24.96


0,8

2.07

12.42

24.84


70%

2.05

12.30

24.60


60%

2.03

12.18

24.36


50%

2.01

12.06

24.12

Ideal max. discharge

40%

1.98

11.88

23.76


30%

1.96

11.76

23.52


20%

1,93

11.58

23.16

Absolute max. discharge

10%

1.89

11.34

22.68


0%

1.75

10.50

21.00


Exploded lead-acid battery Exploded lead-acid battery