Solar Tools & Calculators
Professional-grade tools to help you design, calculate, and compare your solar system. Free to use, no registration required.
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Solar Calculator
Calculate your potential savings, system size, payback period, and 25-year ROI based on your location and energy usage. Uses real NREL data.
Free · No login requiredOpen Calculator
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System Builder
Design your complete solar system — panels, inverter, battery, and racking — with component compatibility checks and instant pricing.
Interactive · Saves and sharesBuild My System
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Compare Panels
Side-by-side comparison of up to 4 solar panels. Analyze specs, efficiency, warranties, and pricing. Export to CSV or PDF.
Free · No login requiredCompare Panels
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Test Your Knowledge
Quiz yourself on solar panel technology, installation, and financing. Great for homeowners and industry professionals alike.
Free · No login requiredTake the Quiz