This chart shows the average range which can be possible Video – 12v battery voltage explainedĪGM battery voltage chart 12v Battery O ☌ (32 ☏) 1O ☌ (50 ☏) 2O ☌ (58 ☏) 25 ☌ (77 ☏) 3O ☌ (86 ☏) 4O ☌ (104 ☏) Charge Voltage 15.30v 15.06v 14.84v 14.70v 14.55v 14.34v Float Voltage 14.40v 14.16v 13.94v 13.80v 13.88v 13.44vĪs you can see as the temperatures rise the battery voltage will decrease so you’ll have to set the voltage of your battery according to its state of charge or discharge and temperature. Every battery type and brand will have different numbers. Battery Discharge Stage Voltage Required 80% 14-15v 50% 13-14v 20% 12-13v 10% 11.5-12v Note: Check your manufactures instructions about the discharge rate of the battery and its voltage. If you’re using a charge controller it will automatically do the calculations or you can manually put these values in case to increase the lifespan of your battery. When the battery is 80% charged then the voltage will stay stable 12-12.7 volts (Check the spec of your battery for accurate value) but the current or amps will start to decrease as the battery charge will get closer to 100% When your battery is below 80% charged it will safely accept the higher voltage (read the spec of your battery to figure out the maximum voltage) and maximum current (Which should not be 20% of the total capacity of your battery) This is why a battery charger can operate at 14-15 volts during the bulk-charge phase of the charge cycle If the battery isn’t completely charged you can use higher voltage without causing any damage to the battery because the charging response takes priority over any over-charge chemical responses until the battery is completely charged. So, in this case, the voltage will decrease, and also the amps will be 0 or 1 So, in this case, the battery will maintain a lower voltage and the amps will decrease as the battery state of charge will increaseįloat stage: This is the stage in which your battery is fully charged or in the maintenance stage. So 12v battery contains 6 cells so it’ll be 14.4-14.7 voltageĪbsorption Stage: When the battery is 80% charged is known as the absorption stage. So a 12v lead-acid or AGM battery will use 2.4-2.45v per cell (Read the values on your battery). So in this stage, the battery will use the maximum voltage input voltage There are mainly 3 stages of charging the battery, Bulk, absorption, & Float stageīulk Stage: when the depth of charge of the 12v battery is 80% it’s called the bulk stage means your battery is 80% discharged.
The charging voltage of the battery will depend on a few factors, its state of charge or discharge & weather temperature.Īnd of course, every battery will also have a different voltage limit while recharging
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