Estimate annual bill savings, export income, payback time and 25-year return—before you request an installer quote.
Independent planning estimate—not an installer quote.
Unlike calculators that return one unexplained number, SolarWorth separates bill savings, export income and long-term assumptions.
| Year | Solar generation | Bill savings | Export income | Maintenance | Cumulative net benefit |
|---|
Results are estimates. Actual output and savings depend on location, shading, roof orientation, equipment, tariffs, usage patterns, system losses and installer design.
It is designed to help you understand a quote—not collect your details for one.
Change solar yield, self-consumption, export rate, degradation and electricity-price growth.
See how weaker or stronger performance changes payback instead of relying on a single optimistic result.
Follow the estimated value year by year, including degradation and maintenance.
Solar electricity used in your home reduces grid electricity purchases.
Solar electricity not used in the home may earn an export payment.
Payback occurs when cumulative net benefits reach the net installation cost.
Learn how solar payback is calculated, which assumptions change the result and how to compare quotes without relying on an optimistic headline number.
Read the solar payback guide →The calculator estimates solar generation, separates electricity used in the home from exported electricity, applies the selected import and export rates, subtracts maintenance and projects the result over time.
Use a location-based solar production tool or an installer estimate. Solar resource tools such as PVWatts can estimate energy production for a proposed grid-connected photovoltaic system.
Solar used directly in the home is valued at the avoided electricity purchase price. Exported solar is valued at the selected export payment, which may be lower.
Not directly. A battery can change self-consumption, export and costs. You can model part of its effect by changing self-consumption and total installed cost, but a dedicated battery calculator will be more precise.
No. It is an independent planning estimate. Professional assessment is still needed for roof condition, shading, structural suitability, electrical design, equipment, permits and local incentives.
