Solar Calculator

Estimate your power usage & what you need.

To help you plan what size solar rig you need to build we have built this handy calculator for you. Simply add each thing that you will be running, how many Watts it is, and how long you expect to run it each day. You can then email what you've spec'd to yourself. The item field has auto complete with suggested wattage to help guide you.

If you need help working out what power your items are using you can get our Plug In Power Meter to help work out your usage

Lights x 5 - 5W each running for 8 hrs per day
TV x 1 - 100W running for 2 hrs per day
Sound system x 1 - 80W running for 6 hrs per day
Start typing the item and it will suggest an item, wattage and hours. (you can then adjust before pressing the Add button)

Item Quant Watts Hours Watt Hours
Example: Light x 1 20 W 10 Hrs 200 Wh
Total Watt Hours
200 Wh
Item Quantity Watts Per Item Hours Used Per Day  

Start Typing for suggested wattages and hrs
x W Hrs


Overspec by %
Average Hrs of Peak Sun
UK Winter: 2-3 hrs, UK Summer: 5-6 hrs
Battery Bank


Sun Spec
Amp Hrs of Batteries
Solar Panels - Watts
Solar Panels - Kw

Please bare in mind you should always over spec by a lot to cater for english winters. We would advise 50%-100% over if you plan to run entirely from solar over winter months, and ensuring you have a very large battery bank as well.

Email this Breakdown to yourself.
Name  *
Email  *


This is just a simple Calculator to help you estimate the solar you need. This is not a guarantee that the solar you calculate will be perfect for your situation.