Size your solar system to your home appliances.

Divide your average daily usage in kWh by about four — each kW of solar generates roughly 4 kWh a day across most of Australia. A typical family home using 20 kWh a day is well matched by a 6.6kW system; add headroom if you have ducted air-conditioning, a pool, an EV or plan to add a battery.

Fifteen to seventeen panels, at the 400–440W modules sold in Australia in 2026, taking up roughly 28–32 square metres of roof. A 10kW system is 23–25 panels. Panel count follows the wattage of the module, so two systems of the same kW size can differ by several panels.

It generates about 26 kWh a day averaged over a year, which covers a typical household's 16–25 kWh. What decides it is not the total but how much you use while the sun is up: a home that exports most of its generation at 5–8c and buys it back at 30c+ is better served by a battery or a shifted routine than by more panels.

Prices include GST and already have the federal STC rebate deducted, so they reflect what you pay. The only variables are non-standard installation factors like a tile-to-tin transition, a switchboard upgrade or a long cable run, which we confirm during the free site design.

Adding a battery at installation is cheaper than retrofitting, because the mounting, wiring and inspection all happen once. The federal Cheaper Home Batteries rebate discounts it per usable kWh, which shortens payback considerably compared to previous years.

Sometimes — it depends on spare inverter capacity and your network's export limit. It is almost always cheaper to size a few kW larger up front than to run a second installation later.

Manufacturer spec sheets and Energy Rating Label registrations, with the source recorded against each appliance and the set re-checked on 3 October 2026. Air conditioners are listed by the electricity they draw, not the cooling they deliver — a unit sold as 5kW draws about 1.3kW — which is where most published appliance tables overstate them three to four times.

Not currently. Kratos Energy installs across New South Wales, Victoria and the Australian Capital Territory. You're welcome to use the builder and calculators wherever you are.