Solar calculator
Estimate solar payback, annual savings and returns using your roof, tariff and electricity use.
Battery calculator
Compare battery costs, usable capacity and savings against real-world electricity tariffs.
EV charging calculator
Model EV charging costs at home, work and public chargers.
Solar Calculator
Enter your roof, tariff and usage details to estimate annual generation, bill savings, payback time and long-term solar returns using sensible UK assumptions.
Free
Battery Calculator
Compare battery sizes against your electricity habits, import rates and export payments to see whether storing energy improves the household maths.