Solar & home energy made simple
Free solar and home energy tools and guides, whether you're looking for pro help or DIY
- We analyze your roof for solar suitability
- You enter your energy history and goals
- We show potential savings and next steps
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Solar Calculators
Interactive tools to help you plan and size your solar system
Solar roof calculator
See how well your roof is suited for solar power.
Solar savings calculator
Find out how and when an investment in solar will pay off.
Inverter size calculator
List your electrical devices to calcuate required inverter size.
Find matching solar panels
Find solar panels for a solar generator, inverter, or charger.
Series & parallel calculator
Calculate voltage and current for different series / parallel wiring.
Panel angle calculator
Find the optimal tilt angle for your solar panels.
Compare Solar Equipment
Research and compare solar panels, inverters, batteries, and generators
Learn About Solar
Understand home energy and make informed decisions
Community Solar Projects
Real solar installations shared by the WattBuild community
Texas
Tiltable solar panel array, Unistrut to mount. July 2023 electric bill $253.45, July 2024 (with solar) $46.03. During cooler months expect it to be even less!
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