Solar Calculator

Appliance Watts Hours Wh
To calculate approximately how much electricity you use every day in Watt-hours (Wh), enter the power of each appliance and the average length of time it is on for each day. 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 banks sizes are normally quoted in Amp-hours (Ah), which are Wh divided by voltage. To calculate how many Ah the above appliances use every day, enter the system voltage (usually 12V for most boats and caravans) and click the button.
System voltage Amp hours per day

Watts    
This section calculates the daily power output of a solar panel so you can compare it to the amount of power you consume. Simply enter the panel power in watts in the 'W' box, and press the button.

 
  Average Summer Winter
Wh
Ah
    Max A

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