Free Solar Calculators That Actually Work
Get instant, accurate answers on panel tilt angle, system sizing, voltage, wire size, and installation cost. No signup, no email — just numbers. Built for Australian homeowners and DIY installers.
Most popular calculators
- Solar Rebate Calculator (STC + State)Free solar rebate calculator for Australian homeowners. Estimate the value of your STC point-of-sale discount, state rebates (VIC Solar Homes, NSW Empowering Homes, SA Home Battery), and the new Cheaper Home Batteries Program.
- How Many Solar Panels Do I Need?Free Australian calculator to size your solar system. Uses CEC-aligned irradiance, average household consumption (6,500 kWh/yr), and 440 W panel specs typical of 2026 installs.
- Off-Grid Solar System Calculator (Australia)Free Australian off-grid solar calculator. Sizes PV array (kW), battery bank (kWh), and inverter (kW) from daily kWh load using BoM irradiance data and CEC-aligned design factors.
- Solar Panel Output Calculator (Australia)Free Australian solar panel output calculator. Estimate daily, monthly, and 25-year kWh production from your array, sun hours, and system efficiency — plus dollar savings.
- Solar Panel Savings Calculator (Australia)Free solar panel savings calculator for Australian homes. Estimate 25-year lifetime savings using your annual generation, retail rate, state feed-in tariff, self-consumption, and price escalation.
- Cost of Solar Panels Calculator (Australia)Free Australian solar panel cost calculator. Estimate after-STC installed cost from your monthly kWh, peak sun hours, A$/W, and STC rebate. 2026 Clean Energy Council and SunWiz data.
- EV Charging Calculator (Australia)Free EV charging calculator for Australian drivers. Estimate kWh drawn, charge time on a 7.4 kW single-phase wallbox, electricity cost at 2026 retailer rates, and savings from charging via rooftop solar.
- Solar Electricity Bill Savings Calculator (Australia)See exactly how much your monthly power bill drops after going solar in Australia. Free calculator with 2026 AER DMO rates, state feed-in tariffs, STC rebate and Cheaper Home Batteries built in.
- Solar Investment Tax Credit Calculator (Australia)Free commercial solar investment tax credit calculator for Australian businesses. Estimate STC point-of-sale discount, Instant Asset Write-Off, Division 40 depreciation, and net cost after every business incentive.