Agm Battery Voltage Vs State Of Charge

Show why using a generic voltage to soc chart may not work for your battery bank.

Agm battery 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. Show the actual rebound voltage after discharging to 50 soc under controlled conditions. Higher charge rates in agm batteries actually yields longer life. Odyssey battery thin plate pure lead agm wants to see a minimum of 4c and lifeline a minimum of 2c.

Battery voltage state of charge table. The voltage at 1 24 sg. The figures are based on open circuit. Even the weather can play a role.

The chart is listed below. If you have a load running the battery voltage will drop and if there is a charging source the voltage will increase. But first a few important notes and caveats. This is from the conclusion section of dave v s study.

For this test i wanted to. 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. Battery state of charge vs open circuit battery voltage a common question i receive refers to determining the battery state of charge based on battery voltage. Battery voltmeters are inexpensive easy to install and can provide a wealth of system information to renewable energy users rvers or anyone who depends on a battery.

Voltage richard perez abattery voltmeter is the most 1993 richard perez basic system instrument. The table below shows the voltage and approximate state of charge for each type of battery. Voltages and specific gravity are listed for a 6 volt or 12 volt battery and battery banks of 24 and 48 volts. Utilize a battery not in perfect health to represent real world.

At 25 c 77 f keep charging voltage in the range of 2 4 volts to 2 465 volts per cell for agm batteries compensation for battery temperature above or below 25 c 77 f can be made by subtracting 0 005 volts per cell for each 1 c above 25 c or by adding 0 005 volts per cell for each 1 c below 25 c. An example of specific interest is reducing the sg from 1 265 to 1 24 for a sli battery with 850 a cca when operated at 500 a at 68 f for 10 seconds. What would be an expected voltage at 1 265 sg vs. The lead engineer at lifeline did a study on this years ago presented at the ieee power sources symposium.

Show the relationship of loaded voltage to soc on a popular agm lead acid battery. 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. While wet cells are stated to have 100 soc at 12 7v it is much harder to determine what 100 soc is for an agm battery.