# Tools & calculators

## Battery charge time calculator

This calculator is designed to calculate the maximum battery charge time for any given chargable batter. The calculator will calculate the time after you enter the battery rating capacity, charge rate and the efficiency of the charging system, including the battery. The normally accepted standard for efficiency loss is 20%-30%. Sample values for a car […]

## Battery size calculator

To calculate approximately how big a battery and inverter you require for your power backup needs in Amp-hours (Ah), enter the power of each appliance and the average length of loadshedding time. The first couple of lines are given as an example; just click in the boxes to replace the values with an estimate of […]