SWITCH & SPROUT
UK Plug-In Solar Savings Calculator
Estimate generation, bill savings and simple payback before you buy. Use your own tariff and run conservative, expected and optimistic cases.
Your setup
Total nameplate panel wattage.
Current GB plug-in systems are capped at 800W entering the socket.
Try 50–65% for low daytime demand; 75–90% as a higher-use scenario.
Default example uses the Jul–Sep 2026 Ofgem average. Enter your actual rate.
Only enter a rate you know you are eligible for.
Planning assumption: this calculator uses a deliberately simple annual-yield model. It is for comparing options, not a site-specific irradiance forecast.
Your estimate
Estimated annual benefit
£0
—Annual generation
0 kWh
Average per day
0 kWh
Used in your home
0 kWh
Estimated export
0 kWh
Bill saving
£0
Export income
£0
Simple payback
—
10-year net benefit
£0
Share of annual home use
Use the result as a range. Run a conservative case before buying. Electricity prices, output, usage and equipment performance can all change.
Current GB guidance: one plug-in solar device per property, direct connection to a suitable socket, and registration after installation. Always check the latest official guidance and the manufacturer’s instructions.