Estimate your solar potential
Tell us your roof space and electricity bill and get a rough idea of panels, system size and yearly saving. A guide only, so ask us for an exact quote.
- 20+ years
- Family-run
- Which? Trusted Trader
Solar estimator
Rough estimate only. It does not know your roof, shading or tariff.
Your home
Change any value and the estimate updates.
Edit the assumptions
Rough estimate
- Panels
- -
- System size
- -
- Power made a year
- -
- Share of your use
| No battery | With battery | |
|---|---|---|
| Bill covered by your own power | - | - |
| Estimated yearly benefit | - | - |
Yearly benefit is bill savings plus export income. Shown as a range of 20% either side. This is an estimate, not a quote or a promise of savings.
Want real numbers for your actual roof? We survey it for free.
How the estimate works
No black box. These are the assumptions behind every number, and you can change them above.
- Panel count. Your roof area divided by roof space per panel (2m² each by default), capped at what your bill needs.
- System size. Panels multiplied by panel wattage (430W by default), shown in kWp.
- Yearly output. System size times 900kWh per kWp for a south-facing roof in southern England, reduced for other directions.
- Your use. Your monthly bill converted to kWh at the electricity price, with the whole bill treated as electricity used.
- Self-use. We assume 35% of what you make is used at home with no battery, and 70% with one.
- Benefit. Power used at home saves the electricity price. The rest is exported at the export rate.
- Left out. Installation cost, payback time, shading, degradation, tariff changes and standing charges.
- The price and rate defaults are placeholders. Your own tariff will differ, so edit them.
The real answer comes from your survey. Book it for free.
About the estimator
How accurate is this calculator?
It gives a rough idea only. Real results depend on your exact roof, shading, how you use power and your tariff. Treat the numbers as a starting point and ask us for an exact quote.
Does it include the cost of the system?
No. It does not estimate installation cost or payback, because that depends on your survey. We give you a clear, fixed quote after a free visit.
What if my roof is small or shaded?
Enter the area you could realistically use. Shading, chimneys and roof windows all reduce it, and a survey is the only way to know for sure.
Why does a battery change the saving?
A battery lets you use more of your own solar power in the evening instead of exporting it. We assume more of your power is used at home with a battery, and say so in the assumptions.
Still have a question? Ask us, there is no pressure.
Turn the estimate into a real quote
We will visit, measure your roof, check for shade and design a system around how you use power. You get a clear quote with no obligation.
- Free survey. No charge and no pressure.
- Fixed, written quote. Based on your actual roof.
- Family-run for over 20 years. Fully insured and trusted on Which? and Checkatrade.
Get your free quote
No-obligation. We'll call you back to talk it through, usually the same working day.
Ready for your exact numbers?
Tell us a little about your home and we will come back with a free, no-obligation quote. Or just ring, we are happy to talk it through.