Energy

Home energy calculators with transparent assumptions. Compare technologies, estimate savings, and sanity-check payback periods.

Solar Payback Calculator

Estimate savings and payback with self-consumption, export rate, and degradation.

Compare annual costs: heat pump vs gas vs electric — and find break-even rates.

How many panels do you need? System size, roof space, and basic payback.

Advanced: battery arbitrage and TOU peak shifting ROI.