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 is 60ah and 0.8A for with the Optimate 4 charger
Sample values for a Motorbike is 20ah and 0.6A for with the Optimate 3+ charger
Battery charge time calculator

Battery size calculator
To calculate approximately how big a battery and inverter you require for your power backup needs in Amphours (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 your own power consumption.
To calculate approximately how big a battery and inverter you require for your power backup needs. in Amphours (Ah), enter the power of each appliance and the average
length of time 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 your own power consumption.
Battery size needed calculator 