So for example, a lead acid battery might have a capacity of 600Ah at a discharge current of 6A. With a higher discharge current, of say 40A, the capacity might fall to 400Ah. In other words, by increasing the discharge current by a factor of about 7, the overall capacity of the battery has fallen by 33%.
Although this varies cycle to cycle, the maximum depth of discharge for lead acid batteries is typically at or below 50%. The cycle life of lead acid batteries is highly dependent on the State of Charge (SoC) that the battery is cycled at.
Discharge rate can usually exceed charge rate if required. Recommended operating range 10 to 25°C. Lead acid batteries are highly affected by temperature. The lifetime of lead acid batteries is cut in half for every 10°C rise in operating temperature over 25°C, due to rapid increases in the corrosion rate of the internal components of the battery.
The discharge current required to discharge 37Ah over 8 hours is 4.6A. The discharge power will therefore be 209W (45.2 V * 4.6A). So if we want to be able to power a 1.2kW load for 8 hours from these batteries when fully charged, we will need six of them.
Full recharge within an hour or so, subject to charger sizing. Full recharge within an hour or so, subject to the charger sizing. Discharge rate can usually exceed charge rate if required. Recommended operating range 10 to 25°C. Lead acid batteries are highly affected by temperature.
So if a battery has a nominal capacity of 500Ah and a nominal voltage of 12V, the overall nominal capacity in kWh is 500 * 12 = 6,000Wh, or 6kWh. Remember the battery only has this capacity when operating at the nominal discharge current … The power output of the battery in Watts is given by Discharge current (A)* Voltage (V)