Solar Panel Calculator
Estimate your solar energy production, system requirements, savings, and ecological impact based on your location, roof, and energy usage. Featuring ROI and battery storage insights.
Optimal: Latitude ±10°
Estimated production loss
Check your utility bill for accuracy
Set 0 if none planned
Avg. in US is $1,800/kW (2024, after incentives, before battery)
Typical Li-ion: $400–$800/kWh
How This Calculator Works
- Solar Irradiance: Your selected location’s average annual solar radiation (kWh/m²/day) reflects sunlight available for power generation.
- Roof & Panel Specs: The calculator multiplies usable roof area by panel efficiency, then corrects for shading to compute the maximum energy your panels could deliver.
- Energy Matching: Using your daily consumption, the tool estimates what fraction of your needs the system meets, and whether you’ll have surplus energy.
- System & Battery Sizing: It calculates the system size needed (kW), how much roof space is used, and how much battery storage is required for overnight use or backup.
- Financials: The calculator estimates installed system and battery costs, annual and accumulated savings versus buying grid power, and payback period & ROI over the system’s lifespan.
- Environmental Impact: By switching to solar, yearly avoided CO₂ emissions are estimated based on your clean energy production.
Why Go Solar?
- 🌞 Save money: Solar power reduces or eliminates your electric bill.
- 🌎 Be green: Each kWh of solar avoids ~0.9 kg of CO₂ emissions (USA avg).
- 🔋 Gain independence: Battery backup insulates you from outages and price hikes.
- 🏡 Boost home value: Solar increases property value with modern buyers.