Free Solar Calculators That Actually Work
Estimate solar sizing, output, tilt, storage, charging, and cost with transparent formulas, editable assumptions, and linked sources. No signup or email required.
Most popular calculators
- Caravan, Motorhome & Camper Trailer Solar CalculatorFree Australian caravan solar calculator: enter daily Wh, peak sun hours and battery type — get panel wattage, battery Ah, MPPT controller and inverter size for caravans, motorhomes and camper trailers.
- 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.
- Solar Panel Replacement Cost Calculator (Australia)Free Australian solar panel replacement cost calculator. Estimate per-panel labour, materials, CEC recycling fee and call-out cost and compare against a full new CEC install.
- Hybrid Solar System CalculatorSize a hybrid solar and battery system for Australian homes: PV kW, battery kWh, hybrid inverter rating, and STC rebate impact. CEC-aligned defaults.
- 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 Roof Vent CalculatorSize a solar roof vent from your roof-space area and target air changes. Australian calculator with NCC vent area, fan power, and payback math.