Find the right
solar panel angle
and system size
Start with a quick answer or build a roof project that turns your location, roof area, and bill into a usable estimate.
Why Size.Solar?
Because homeowners need a clear, practical next step before committing to a complex solar system installation.
Roof-based sizing
Turn your roof space, bill, and location into a practical system estimate.
Production estimates
Estimate how much electricity common solar panel sizes can produce.
Panel angle by location
Find fixed, seasonal, and monthly tilt angles for supported cities.
Supplier discovery
Compare nearby solar suppliers after you know what system you need.
Fast planning path
Start with the free calculators, then build a full project when the numbers make sense.
How it works
Planning your solar transition shouldn't feel like rocket science. Start sizing in minutes.
Enter your details
Input your monthly bill, choose the operation mode (supply from grid, net metering, or off-grid, with or without battery backup), and select the desired battery duration.
Set your preferences
Do you have equipment preference? Just let us know! We will provide a tailored breakdown of your required solar setup, including specifics such as the connection method, number of inverters, and batteries.
Select your roof
Select your roof space, which helps us calculate the tilt, azimuth solar insolation and irradiance for your roof.
Connect with suppliers
Browse the supplier map to find listed products and service areas.
Go solar & start saving
Embark on your journey towards energy independence and significant cost savings.
Are you a supplier?
List your service areas, products, and quote options where homeowners are already planning solar projects.
