Home › About

About InverterPlan

InverterPlan helps people work out the backup power they actually need before they spend money on it.

Buying an inverter, batteries and solar panels is a big expense, and it is easy to be sold a system that is too small to cope or bigger than you need. InverterPlan gives you an independent estimate you can check quotes against: tell it what you want to keep running, how long your power goes off and where you live, and it does the sizing.

Where the numbers come from

• Sunshine: NASA POWER, long-term monthly averages for any point on Earth.
• Towns and cities: GeoNames, under the Creative Commons Attribution 4.0 licence.
• Sizing rules: standard installer practice, every assumption listed on How we calculate.

Independent

We don't sell equipment and no manufacturer or installer pays to change the results. If we ever show advertising or recommend products, it will be clearly labelled and kept separate from the calculator.