Off-grid calculator
How big does your off-grid system really need to be?
Two minutes, honest maths. Pick what the place has to run, tell us roughly where it is, and see the array, battery and inverter that would carry it — sized on a Victorian winter, because that's the season that decides everything.
What does the place need to run?
Tick what you’ve got and rough numbers are filled in for you — adjust any of them. Or skip the lot and type a daily figure.
Fridge
Compressor cycles on and off — about 8 run-hours a day.
Chest freezer
Similar duty cycle to the fridge.
LED lighting
A whole house of LEDs, evening use.
Washing machine
Cold wash — a hot wash roughly triples it.
Dishwasher
Mostly the heating element.
TV & entertainment
Telly, sound and the bits on standby.
Laptop & office
Computer, monitor, router, printer.
House water pump
Pressure pump — short bursts, big start-up.
Bore / dam pump
Garden and stock water. Run it in the middle of the day.
Workshop tools
Saws, compressors, welders — one at a time.
Big-ticket extras
Heating & cooling (heat pump)
Reverse-cycle split. Winter heating is the load that matters.
Heat pump hot water
Timed to run in the solar window.
EV charging
About 40 km of driving a day. Charge from the sun, midday.
Something we missed?
Got three-phase gear?
Big bore pumps, workshop machinery, welders. Three-phase off-grid is a bigger build — flick this on and we’ll size a three-phase inverter bank for it.
Daily energy
0.0 kWh
Peak demand
~0.0 kW
the most it draws at once
Like what the numbers say?
A calculator gets you in the ballpark — a real design is built on your actual usage data and the site itself. Send us the property details and we'll take it from here.