Agm Voltage Vs State Of Charge

At rest means not being currently charged by a charger solar panels or discharged by devices attached to the battery bank.

Agm voltage vs state of charge. Battery state of charge can also be estimated with impedance spectroscopy using the spectro complex modeling method. State of charge does vary a little between a sealed lead acid flooded gel and agm deep cycle battery types and also between brands. The chart is listed below. But first a few important notes and caveats.

I put together the following battery state of charge chart which indicates the state of charge percent as it relates to battery voltage or specific gravity. Battery voltage state of charge table. Voltage polarization and surface charge do not affect the reading as soc is measured independently of voltage. If you have a load running the battery voltage will drop and if there is a charging source the voltage will increase.

The table below shows the voltage and approximate state of charge for each type of battery. Even the weather can play a role. State of charge soc for agm batteries it will be pointed out that soc can only be measured by voltage when the battery bank has been at rest for at least 3 hours. Which brings up the observation that since they are using resting voltage to assess soc and that is highly dependant on the state of health of the batteries with old batteries taking a lot longer to settel down to resting voltage a lot of the problem is that the charge controler is set up to over charge older batteries by its very limited design.