Solar Panel Calculator

The Solar Panel Calculator below is designed to help you establish what sort of solar panel kit you'll need to power your appliances. Once you have thought about what appliances you want to power using solar energy, check the user manual or the appliance itself to establish the wattage. For example, if you have a laptop look at the adaptor pack and you should see the wattage listed there (typically 65W).

Stage 1 - Watt-hour Calculation

Once you have wattage figures for each appliance simply enter them in the boxes below to establish the total Watt-hour for all your appliances.

Why not check out our Home Appliance Energy Use to see how much power your device will need

Appliance Watts
Usage hours per day
1 Hours
2 Hours
3 Hours
4 Hours
5 Hours

Energy required by appliances per day is : Watt-hours
Stage 2 - Efficiency Adjustment

Efficiency adjustments account for natural losses, we multiply the result by 1.2 (this factor allows for natural system losses, assuming 85% efficiency).

The panels will actually need to be able to supply a total of : Watt-hours (efficiency adjusted)

Stage 3 - What solar panel kit do I need to power my appliances in the UK?

Average Peak Sun Hours Per Month
UK Met Office Data 2000 - 2010
Solar Panel Kit Required
January 2 Hours Watt Panel Kit
February 3 Hours Watt Panel Kit
March 4 Hours Watt Panel Kit
April 6 Hours Watt Panel Kit
May 6 Hours Watt Panel Kit
June 7 Hours Watt Panel Kit
July 7 Hours Watt Panel Kit
August 6 Hours Watt Panel Kit
September 5 Hours Watt Panel Kit
October 4 Hours Watt Panel Kit
November 3 Hours Watt Panel Kit
December 2 Hours Watt Panel Kit

To be safe The Solar Centre advises using the Average figure when selecting solar panel kits from our range below.