How to determine the amount of Charge in a Battery?

[Shapath]

Dear All,

So far all the batteries i have installed with the solar system, i checked the voltage to get idea about the condition of the battery. But does this voltage on the meter actually represents the amount of charge stored in the battery?

I am now asking this question cause recently in one of our maintenance free lead acid battery i measured the voltage and it was 12V. then i connected it with the Intelligent charge controller and the charge controller starts displaying LOW Voltage. Hence I think the quantity of charge stored in it (Coulomb) is lower then it should be.

Therefore I would like to know what should i do if further this problem arises and also how to determine whether the battery is charging properly or not and also the amount of charge in the battery.

Thank you

[Perry]

Dear All,

So far all the batteries i have installed with the solar system, i checked the voltage to get idea about the condition of the battery. But does this voltage on the meter actually represents the amount of charge stored in the battery?

I am now asking this question cause recently in one of our maintenance free lead acid battery i measured the voltage and it was 12V. then i connected it with the Intelligent charge controller and the charge controller starts displaying LOW Voltage. Hence I think the quantity of charge stored in it (Coulomb) is lower then it should be.

Therefore I would like to know what should i do if further this problem arises and also how to determine whether the battery is charging properly or not and also the amount of charge in the battery.

Thank you

I'm new here, but I'm guessing that ....

While the open circuit voltage of the battery reads 12volts, once you put it under load, the voltage could be falling off. I'm guessing you need to use a Load Tester to check the battery under load. Most Auto repair shops should have one.

[Mike90250]

pure voltage can be used to measure a batterys state of charge, but the loads/charger need to be disconnected for several hours.

there are special battery meters (totalizators) that measure the amps in / vs out and calculate what is left