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 Feed-in Tariff Calculator (Australia)Calculate your annual solar FIT revenue under Australian state schemes. Free 2026 calculator with VIC 3.3c, NSW 4.9c, QLD 6c, SA 4.3c, WA DEBS 2.5c rates.
- Solar Feed-in Bill Savings Calculator (Australia)Calculate your annual electricity bill savings under Australian solar feed-in tariffs. State-by-state FIT comparison, DMO retail rates, and battery economics for 2026.
- 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 Pool Heating CalculatorSize a solar pool heating system for Australian climates and estimate annual savings vs gas or heat pump. Free calculator with CEC and Clean Energy Council guidance.
- 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.
- Solar Inverter Size Calculator (Australia)Free Australian solar inverter sizing calculator. Enter your kW DC array and target DC/AC ratio — get inverter kW AC, clipping loss, and CEC compliance check.