Example calculation
Solar Plan Lab uses the current project values to show how the recommendation changes.
Connected design
Design your solar system without the technical overload.
Start with electricity use, battery preference, and roof size. Open Advanced view only when you need technical control.
No account Instant result Explanation included
1Tell us what you knowStart with the fields you already understand.
2See the recommendationSee the number and why Solar Plan Lab suggested it.
3Refine or downloadChange the plan before you buy or download anything.
New to solar? You do not need to choose a calculator first. Build a guided home solar plan →
Design inputs
Start with the essentials
Most homeowners only need the Simple view. Solar Plan Lab keeps practical defaults in the background.
Roof fit
— See how the panels fit
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Estimated energy coverage—
Do not rely on one number alone
Check the result against actual equipment and site conditions.
Is this installation-ready?
No. It is a planning estimate that should be verified by qualified professionals.
How was this calculated?
Calculation method
Formula
The calculator uses the displayed inputs and standard planning relationships.
Important assumptions
Read the full methodology and update history → Verify the final design against actual equipment data sheets, site conditions, and applicable requirements.