Beating the Load Shedding Blues
The first thing is the total current demand from your system.
Let’s look at an easy way to determine this.
Look at the capacity of the battery that has been supplied. Mostly you will find a 7AH or 8AH battery. In some instances you may have been provided with an 18AH battery.
Establish for how long the battery maintains your system when the power outs, and divide the capacity of the battery with the number of hours of operation maintained.
This rough calculation will give you an estimate of the Current in Amps that your system will draw per hour.