How Much Voltage To Charge 12v Battery. With solar particularly during winter and deeply cycling batteries 75 to 50 state of charge many times you need to hit the battery with much higher voltages to get it to charge quickly in the limited number of hours per day. With the engine off you should get a reading of 126 volts.
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. View the most popular hydrometer on amzn. You need to make sure that the charger is in the right volt and you have the proper reading of the battery.
As a battery is charged the indicated voltage increases and as discharging occurs the indicated voltage decreases.
Of course the rate varies depending on the kind of battery that youre charging and its capacity. Actual measured voltage of the 2 series batteries while charging is 2885 volts with a current of 240ma. In fact fast charging for this kind of battery is not. Voltage on a fully charged battery will read 212 to 215 volts per cell or 127 volts for a 12 volt battery.
