Free tools
Calculators that design the system with you
Every tool computes live as you type, explains its method, and turns your numbers into a brief you can hand any installer. Members save results across devices.
Lay the whole site out, total the loads, and convert whatever unit the datasheet used.
Array size, panel to battery, and the cable that carries it without losing the volts.
How big the bank has to be, how long it lasts, and what the chemistry costs over its life.
What each machine really draws, what it spikes to on start-up, and whether your system carries it.
Generator size and fuel burn, how loud it is at the fence, how much fuel to store, and what the fridge can survive.
Rain caught, water used, tanks and pressure, and the wood a winter takes.
No numbers required
Rather be asked than calculated?
The quizzes work the other way round: they ask about your life and hand you the answer — which energy source, which water source, which land, which region. Or take the whole assessment at once.