What could you save?
Choose a kit and tell us who's at home in the day. You'll see your yearly saving, the totals over 10 and 20 years, and the carbon saved.
Checked 4 November 2026
Simple tip
Save more by using it in the day
Your kit saves you money when your home uses its power as it's made. So run the washing machine, the dishwasher or the tumble dryer while the sun's out.
That's how a busy home, with someone in all day, gets the most from a kit.
Where the numbers come from
| What we assume | Figure | Source |
|---|---|---|
| Power from an 800W kit | About 700 kWh a year (south-facing, 30° tilt, no shade, North West England) | Energy Saving Trust: plug-in solar panels, updated 1 October 2026 |
| Kits with more than 800W of panels | Panel power × 875 kWh per kW, less a fifth of the extra above 800W | Our estimate, based on the Energy Saving Trust figure |
| Share used at home | 40% to 70%. A busy four-person home with someone in all day is 70% | Worked out from Energy Saving Trust figures |
| Unit rate | 26.32p 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 |
| Power sent to the grid | Counted as zero | Self-installed plug-in kits generally don't get export payments |
| Most a kit sends into your home | 799VA (3.5A) | The maker's datasheets |
| Which way it faces, and shade | Not counted | We don't have sourced figures for these, so we don't guess |
| 10 and 20-year totals | Today's unit rate, with panels losing 0.5% a year | Our assumption |
| Carbon saved | 0.131kg CO₂e for each kWh used at home | UK Government GHG conversion factors 2026 |
This is an estimate, not a promise. Your saving depends on where you live, the sun on your spot and when you use power.
How it's worked out
- Power made. We start with the Energy Saving Trust's 700 kWh a year for an 800W kit. Smaller kits scale down. Bigger kits make more in the mornings, evenings and on cloudy days, but stop at 800W at midday. So we scale them up by panel power, less a fifth of the extra. That's about 850 kWh for the Plus 1030W and about 980 kWh for the Large kit.
- Power used at home. Only power your home uses as it's made saves money. We use 70% for a busy home, 58% if someone's in most of the day, 49% if you're in and out, and 40% if you're usually out.
- Over 10 and 20 years. We add up each year's saving at today's unit rate, with the panels losing 0.5% a year. If prices rise, you'd save more.
- Carbon. Each kWh you use from your panels, not the grid, saves about 0.131kg of CO₂e.
Saving = power made × share used at home × unit rate, rounded to the nearest £5. You can put in your own figures above.
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