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
- 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.