Interactive estimate
Estimate solar savings
Use bill size, roof direction and occupancy to create a realistic early savings range.
This range is deliberately cautious. It is a screening tool, not a quote.
Visible assumptions
The calculator estimates annual generation at 950kWh per kW before roof adjustment. It values home-used solar against your estimated bill rate and assumes export income is secondary. Tariff changes, shading, standing charges and finance costs are not included.
How the savings range is estimated
The calculator converts your monthly bill into an estimated annual electricity spend, then compares that with a solar generation estimate for the system size and roof direction. It adjusts the self-consumption range for daytime occupancy and battery selection.
The output is shown as a range because solar savings are not one neat number. Tariffs, weather, shading, appliance timing and export rates all move the result.
When a battery may help savings
A battery often helps most when the home exports a lot of daytime solar but still buys electricity in the evening. It may help less if someone is home most days using appliances while the system is generating.
For a cleaner decision, compare a solar-only quote and a solar-plus-battery quote using the same import rate, export rate and generation assumption.
Common questions
Will solar panels wipe out my electricity bill?
Usually not. Solar can reduce grid imports, but standing charges, winter usage and evening demand often remain. The calculator shows a range rather than promising a zero bill.