Solar Roof Estimator
What you’ll get
- Panels drawn on your actual roof, shaded by how much sun each one gets
- System size, yearly production and how much of your use it covers
- Every roof face measured: direction, pitch, area and sun hours
- A chart comparing every system size that fits
- The EG4 inverter, GridBOSS and batteries your system needs
- CO₂ avoided, plus a free 25-year savings and payback report
Demo mode: sample roof drawn as a schematic.
System size
Your electricity
Savings and payback
Estimates before incentives, using a flat $/W installed price and only the electricity you use yourself. Batteries are extra.
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Explore your plan
The details behind your estimate. Change the system size above and every tab updates.
| Roof side | Faces | Slope | Roof area | Sun per year (hrs) | Panels | Electricity / yr (kWh) |
|---|
From Google’s roof measurements. Sun hours are the typical spot on each roof side after shading from trees and nearby buildings. South and west faces usually produce the most.
Each bar is one spot on your roof where a panel fits, sorted roughly from most to least sun. Taller bars make more electricity. Your plan uses the sunniest spots first.
Each bar is one system size. Taller bars make more electricity per year. The dashed line is what your home uses. Use the slider above, or click a bar, to change size.
Your 25-year savings report is free
See your bill before and after solar, your payback year and lifetime savings.