The life of the lead-acid batteries heavily depends on the rate of charging and discharging. We can increase the life of our batteries by simply controlling the charging and discharging rate. In this article, you will find about the optimal value of charging and discharging rate of a battery.
SOC is defined as the state of charge of the battery. This parameter is generally used to design the controller for the battery. It will depict the percentage of battery charge at the instantaneous time. Batteries come with instructions to keep a minimum value of SOC at any time to increase life. The minimum value of SOC depends on the type of batteries. Generally, there are two types of batteries depending on the value of minimum SOC.
- Regular Batteries
- Deep Cycle Batteries
Regular batteries come up with minimum SOC level of 70% while deep cycle batteries have a minimum SOC value in the range of 30-50%. Controllers are designed keeping in view the type of batteries. Good controllers will not allowed the batteries to discharge below the minimum level and also avoid overcharging.
The next question is at which voltage we have to charge and at which level we have to stop the charging. The most effective battery chargers are those who can supply limited current at a constant voltage. The optimal voltage for charging the regular batteries is 2.30-2.40 volts per cell, while for deep charge cycle batteries the voltage is 2.40-2.50 volts per cell.
*Indications for the Battery to be fully charged:
- 100% SOC
- Voltage = rated voltage + 6% * rated voltage.