Sizing of batteries – for SolarDr Mike
The use of solar off-grid energy supply is becoming increasingly popular for domestic, industrial and municipal applications. Due to the variable nature of renewable energy sources, many of the installations include an energy storage system to enable supply for peak demands and when energy generation is limited. There are alternative storage technologies but the method of calculating the size of the lead acid battery required is common to all chemistries. To ensure a system that satisfies the usage requirements it is necessary to obtain a reasonably detailed picture of the loading and run time autonomy of the battery. Allowances must be made for the efficiency of the components in the system in converting energy from the input source to the demand on the battery. For this, the size of individual load, the total load and the individual run times are crucial factors in calculating an accurate battery capacity for the system requirement.