Free Solar & Energy Tools
What is a kWh?
A plain-English explainer with real appliance costs, the unit every other tool here builds on.
Energy cost calculator
Estimate your annual electricity cost and what a typical solar system could save you.
Appliance running costs
Pick an appliance, or enter its wattage, and see what it costs to run per use, per day and per year.
EV charging cost comparison
Compare pence-per-mile costs for home, solar-offset, public rapid charging and petrol, for your own car.
Compare panel & battery models
Pick real solar panel and battery models and see them side by side on efficiency, capacity and warranty.
Glossary
Plain-English definitions for the terms you'll see across solar, battery, heat pump and EV charger quotes.
All six are free to use, with no email or signup required. Once you know your numbers, get matched with vetted installers for a quote based on your own home.