Plug-in solar savings calculator
Estimate annual savings, export income, and payback for a plug-in solar kit.
kWh means kilowatt hours: the units your electricity supplier uses on your bill.
The total wattage of your plug-in solar panels, e.g. 800 for two 400W panels
How much electricity your home uses per day on average. A typical UK home uses 8-10 kWh per day.
What your electricity supplier pays you for exported solar. Check your supplier's SEG tariff - typically 1 to 12 pence per kWh.
The percentage of solar electricity you use directly rather than exporting. Run appliances during the day to increase this. Most homes without batteries are around 30%, homes with someone in during the day are around 50-70%.
What you paid (or expect to pay) for your plug-in solar kit including panels, inverter, and mounting.
Adjusts the UK-average sunlight assumption. Pick the closest match — the default suits most unshaded installations.
Your estimate
£136
Total annual benefit
£18
Annual SEG income from exports
2.6 years
Payback period
- Annual solar generation
- 876 kWh per year
Based on UK average sunlight (~4 peak sun hours/day) and a 75% system performance ratio (accounting for inverter, wiring, temperature, and shading losses). Actual generation varies by location, orientation, and weather - use PVGIS for a location-specific estimate.
- Electricity you use from solar
- 438 kWh per year
- Electricity you export to the grid
- 438 kWh per year
- Annual savings from using your own solar
- £118
- Annual SEG income from exports
- £18
- Total annual benefit
- £136
- Payback period
- 2.6 years
Note