Energy Stack / Tools
Calculators
Built for the kinds of questions that crop up while you are reading a quote. Each one prints the working it does to reach the number, so you can sanity-check it against your own assumptions.
Solar
Roof orientation, shading, tariff and behaviour. Returns a year-by-year breakdown with assumptions visible.
Battery
Drop in your evening load shape. Returns the smallest battery that catches most of your spare solar.
EV charging
Smart-tariff overnight charging compared against a standard rate, with home losses kept in.
Heat pumps
A back-of-envelope check on a survey number you have been quoted. Not a substitute for the real survey.