Energy Requirements Estimation Sheet

In order to select an appropriate energy system for your requirements, it is necessary to calculate your average daily electricity consumption in watt-hours. Energy = power multiplied by time, so follow these simple steps :

Step one

Obtain the power rating (in watts) of each light and appliance that you wish to use (normally found on the name plate) and record in column one. If the appliance is only rated in amps, then multiply the amps by the mains voltage to find watts.

Step two

Carefully estimate the daily running time of each light and appliance in hours and record in column two. Be realistic, but remember, this is the bottom line as far as the size and cost of your energy system is concerned. Note : Refrigerators and freezers have a compressor running time of between 30 and 70% depending on the ambient temperature and the thermostat setting

Step three

Multiply the figures in columns one and two together and total the resulting watt-hours.