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12 Volt Lead Acid Battery State of Charge (SOC) vs. Voltage while battery is under charge Battery State of Charge (SOC) in Percent (%) Battery Voltage in VDC 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 10 20 30 40 50 60 70 80 90 100 110 120 Rest C/5 C/10 C/20 C/40 As a battery is charged the indicated voltage increases and, as discharging occurs, the indicated voltage decreases. Battery voltage state of charge table. That is, when the deep cycle battery isn’t under load and hasn’t been under load for a few hours. At the voltages to SOC show here, your SoC will actually be lower when discharging at a lower discharge rate.
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.
If you have a load running, the battery voltage will drop and if there is a charging source the voltage will increase. 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.
Hydrometer readings should not vary more than .05 differences between cells. The chart is listed below. But first, a few important notes and caveats… The voltage required to charge has to be larger than the voltage present so if the battery is at 12 v , even 12.1 volts will eventually charge .
Fully charged voltage.
Digital Voltmeters should read as the voltage is shown in this document.
Battery voltage reacts highly to charging and discharging. Note: The figures are based on open circuit readings. The sealed AGM and Gel-Cell battery voltage (full charged) will be slightly higher in the 12.8 to 12.9 ranges. The table below shows the voltage and approximate state of charge for each type of battery. Percentage of Charge 12 Volt Battery Voltage Specific Gravity 100 12.70 1.265 Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery, and battery banks of 24 and 48 volts. With experience, one can accurately determine state of charge using a voltmeter. A fully charged car battery voltage should be 12.6v or above, this is with the engine off. Conversely your SoC to loaded voltage will also not be the same as here.
A typical cruising boat with a 400Ah bank will be discharging, on average, somewhere in the 5-6A range if averaged over a 24 hour period.Your under-load voltages should not drop this fast with healthy batteries. To get a true voltage reading of the cars battery it is important to measure the voltage after the car has been sat for a period with the engine off, preferably overnight, this provides you with the “car battery open circuit voltage” or also know as the “resting voltage”. A load test can only be performed if the battery is near or at full charge.