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plugandsolar

Plug-in solar savings estimator

Pick your kit and who's home in the day. You'll see an estimated yearly saving with every assumption beside it.

Checked 24 October 2026

Your home and your kit

Where will the panels sit?
Change the figures we use

Your estimate

Estimated bill saving

around £75–£105 a year

Estimated generation
700 kWh a year
Used in your home
49%
Range, 40–58% used
£75–£105
Unit rate
26.32p per kWh

An estimate, not a promise. It assumes a south-facing, unshaded spot at 30°, North West England, about 700 kWh a year from an 800W kit (Energy Saving Trust), 40–58% of it used at home, and the Ofgem price cap unit rate of 26.32p per kWh (1 Oct to 31 Dec 2026). Electricity you send to the grid isn't paid for. Your result will vary with location, shade and when you use electricity.

See this kit

How the estimate is worked out

  1. Generation. We start from the Energy Saving Trust's figure of about 700 kWh a year for an 800W kit (south-facing, 30° tilt, unshaded, Manchester). For a kit with less than 800W of panels, we scale that down by panel power. For a kit with more, we keep the 800W figure, because no kit can send more than 799VA into your home at any moment.
  2. Use at home. Only electricity your home uses as it's made saves you money. We use 40% if you're usually out all day, 58% if you're home most of the day, and 49%, the middle of that range, if you're in and out.
  3. Unit rate. We multiply the electricity you use at home by the Ofgem price cap unit rate.
  4. Exports. Electricity sent to the grid counts as zero, because self-installed plug-in kits generally don't qualify for export payments.

Saving = yearly generation × share used at home × unit rate, rounded to the nearest £5. You can change the generation figure and the unit rate to match your own.

The assumptions we use

AssumptionFigure we useSource and date
Yearly generation, 800W kitAbout 700 kWh (south-facing, 30°, unshaded, Manchester)Energy Saving Trust: plug-in solar panels, updated 1 October 2026
Share used at home40% to 58%, depending on who's home in the dayWorked out from Energy Saving Trust figures
Unit rate26.32p per kWh, 1 October to 31 December 2026 (Direct Debit, GB average)Ofgem price cap, announced 26 August 2026. The next cap is announced on 25 November 2026
Electricity sent to the gridCounted as zeroSelf-installed plug-in kits generally don't qualify for export payments
Most a kit sends into your home799VA (3.5A), every kitThe maker's datasheets
Direction and shadeNot modelledWe don't have sourced figures for other directions or for shade yet, so we don't guess them. Facing away from south, or shade, means less

This is an estimate, not a promise. Your result will vary with location, shade and when you use electricity.