GL Solar Simulator

See how much solar panels could save you — get an instant estimate for your home using NASA satellite data and Google Solar AI. Free, no sign-up required.

GL Solar Simulator gives you a personalised solar panel estimate for your UK home in under 60 seconds — completely free, no sign-up, no sales calls.

WHAT YOU GET

Enter your address and we'll instantly calculate how much solar panels could save you each year, how long they'd take to pay for themselves, and how much CO₂ you'd offset. All powered by real data, not guesswork.

HOW IT WORKS

1. Enter your address — we find your property using Google Places
2. We auto-detect your roof — Google Solar API analyses satellite imagery to determine your roof area, orientation, and pitch. If your area isn't covered, our EPC database estimates your roof size and you pick the details manually
3. We crunch the numbers — NASA POWER satellite data provides solar irradiance for your exact location, Ofgem provides your regional electricity tariff, and our engine calculates your estimated generation, savings, and payback period
4. Get a free quote — happy with the estimate? Request a no-obligation quote from a certified installer in seconds

THE DATA BEHIND YOUR ESTIMATE

Unlike simple solar calculators that use national averages, GL Solar Simulator combines multiple real data sources for your specific property:

• NASA POWER — monthly solar irradiance data averaged over 9 years for your exact coordinates
• Google Solar API — satellite-based roof analysis including pitch, orientation, and usable area
• DLUHC EPC Register — your property's energy performance certificate data including floor area
• Ofgem Regional Tariffs — your actual electricity unit rate based on your postcode region
• MCS/BEIS Installation Costs — current average UK installation costs per kWp

YOUR ESTIMATE INCLUDES

• Annual electricity generation in kWh
• Annual savings in pounds (including Smart Export Guarantee income)
• System size recommendation in kWp
• Payback period in years
• CO₂ offset in tonnes per year
• Monthly generation breakdown across all 12 months
• Estimated installation cost
• Full transparency on every assumption used

BUILT FOR UK HOMEOWNERS

GL Solar Simulator is designed specifically for properties in England and Wales. Every data source, tariff rate, and cost estimate is calibrated for the UK market. We use Ofgem price cap rates by DNO region so your savings estimate reflects what you actually pay for electricity.

NO ACCOUNT NEEDED

We believe you should be able to explore solar without handing over your details. Browse estimates for as many addresses as you like. Only share your contact information if you want a formal quote from an installer.

PRIVACY FIRST

We don't track you, we don't sell your data, and we don't share your information with third parties. If you request a quote, your details go to one certified installer — that's it.

FREE, FOREVER

GL Solar Simulator is completely free to use with no hidden charges, no premium tier, and no ads.

Questions or feedback? Contact us at info@gl-solar.co.uk