Skip to content

A solar estimate visitors can try before they call

Visitors pick the roof direction, how many panels fit and what they use in a year. It draws the panels on a roof, charts what they'd make each month against what the house uses, and shows the payback.

Try itSwitch the roof to east and west, add a battery, then open the assumptions and change the export rate.

brightroof.example/estimate
Brightroof SolarFree estimate

An estimate from example assumptions, not advice. A survey gives the real figures for your roof.

10 panels, 4.30 kWp, on a roof facing south.

Each month, in kWh

Used at home Exported What the house uses

Point at or tab to a month to see its figures.

0200400600kWhJanuary: made 116 kWh, used at home 64 kWh, exported 52 kWh, house uses 336 kWhJanFebruary: made 194 kWh, used at home 106 kWh, exported 87 kWh, house uses 304 kWhFebMarch: made 310 kWh, used at home 158 kWh, exported 151 kWh, house uses 288 kWhMarApril: made 426 kWh, used at home 141 kWh, exported 285 kWh, house uses 256 kWhAprMay: made 503 kWh, used at home 132 kWh, exported 371 kWh, house uses 240 kWhMayJune: made 503 kWh, used at home 123 kWh, exported 380 kWh, house uses 224 kWhJunJuly: made 503 kWh, used at home 123 kWh, exported 380 kWh, house uses 224 kWhJulAugust: made 426 kWh, used at home 123 kWh, exported 303 kWh, house uses 224 kWhAugSeptember: made 348 kWh, used at home 132 kWh, exported 216 kWh, house uses 240 kWhSepOctober: made 232 kWh, used at home 128 kWh, exported 104 kWh, house uses 272 kWhOctNovember: made 155 kWh, used at home 85 kWh, exported 70 kWh, house uses 288 kWhNovDecember: made 155 kWh, used at home 85 kWh, exported 70 kWh, house uses 304 kWhDec
The figures as a table
MonthMadeAt homeExportedHouse uses
Jan1166452336
Feb19410687304
Mar310158151288
Apr426141285256
May503132371240
Jun503123380224
Jul503123380224
Aug426123303224
Sep348132216240
Oct232128104272
Nov1558570288
Dec1558570304
Which way does the roof face?
Battery
Without a battery, about 55% of the overlap between what you make and what you use is used at home, as you're not always in when the sun is out.
3,870kWh a year
£714saved in the first year
£5,300example price
7.5years to pay back
The estimate in detail
Used at home1,401 kWh (36%)
Exported2,469 kWh (64%)
Share of your use covered44%
Saved on bills£343 a year
Paid for exports£370 a year
Saved over 25 years£16,934
Over 25 years, after the price£11,634

The 25-year figures allow for panel output falling 0.5% a year, and keep today's prices.

Brightroof Solar is invented. The yields, prices and tariffs are example figures, shown on the page and editable. They are not advice.

What this demo does

  • Draws the panels on a roof as you change how many fit.
  • Charts monthly generation against monthly use.
  • Shows how much is used at home and how much is exported, with and without a battery.
  • Shows every assumption, and lets the visitor change them.

What a real one adds

  • Solar data for the visitor's location from PVGIS, the European Commission's free solar service.
  • Your own prices and panel options, kept up to date from an admin page.
  • A survey booking with the estimate attached.
  • Export rates kept in line with the tariffs you recommend.

What it costs

Usually a website or a single tool: £1,500 to £4,000.

Built for your business, with your content, your branding and the parts you need. Every build starts with a free conversation and a fixed quote, and you own the code.

Talk to us about oneAll prices

Questions people ask

How accurate is it?
It's an estimate from a few inputs. A real build can use PVGIS data for the visitor's location, and it always says a survey gives the real figures.
Can it bring in enquiries?
Yes. Visitors can book a survey with their estimate attached, so the surveyor starts with the numbers.
Can we change the prices and export rates?
Yes, from an admin page, so the estimate keeps up with your prices.

More demos

All demos

Start a project

Want one of these on your site?

A few lines is plenty. We reply within one working day, and the first call is free.

Prefer email or a call?enquiries@forgeclass.co.uk07825 030128Forge Class Software Ltd, Sheffield