ENERGY & HOME
Solar Savings & Payback Calculator
Estimate annual electricity savings and simple payback period for a solar system.
Enter values and press Calculate.
How this calculator works
System size is multiplied by average sun hours and a performance factor to estimate annual generation. Generation is multiplied by electricity price to estimate avoided electricity cost.
How to use the result
Change one input at a time to compare scenarios. This helps you see which factor has the biggest effect on your total cost or savings.
Results are estimates for planning and comparison. Actual costs can differ because of taxes, tariffs, fees, usage patterns, equipment efficiency and local conditions.
Frequently asked questions
What is the performance factor?
It is a simplified allowance for inverter losses, temperature, wiring, shading and other system losses.
Is payback guaranteed?
No. This is a simple estimate and does not model financing, degradation, maintenance, export tariffs or future electricity prices.
What sun-hours value should I use?
Use a reliable local solar-resource estimate for your location.
Learn more: Read the solar savings and payback guide →