Solar Carport Calculator

A solar carport is a freestanding structure with solar panels mounted on top, providing shade and weather protection for vehicles while generating electricity. Unlike rooftop solar, carports don't require drilling into your roof and can often be optimally angled for maximum sun exposure. They are ideal for parking lots, driveways, and commercial properties.

Energy production depends on the carport's size, panel efficiency, local peak sun hours, and system losses. A typical 20×10 ft residential carport with 20% efficient panels in a 5 peak-sun-hour location can generate roughly 2,500–3,500 kWh per year — enough to cover a significant portion of an average home's electricity consumption.

Peak sun hours represent the number of hours per day when sunlight intensity averages 1,000 W/m² — the standard used to rate solar panels. It's not simply daylight hours. The US average ranges from about 3.5 (Pacific Northwest) to 6.5 (Arizona/Hawaii). You can find your location's value using NASA or NREL solar resource maps, or check your utility's solar guides.

System losses typically include inverter inefficiency, wiring resistance, soiling (dust/dirt on panels), shading from nearby objects, temperature derating, and module mismatch. The default value of 14% used in this calculator aligns with NREL's PVWatts tool standard. In shaded or dusty environments, you may want to increase this to 18–22%.

Yes. Solar carports are generally eligible for the federal Investment Tax Credit (ITC), currently at 30% through 2032 for both residential and commercial installations, provided the system is connected to the grid and primarily generates electricity. Always consult a tax professional to confirm eligibility for your specific situation.

Payback periods typically range from 5 to 15 years depending on system cost, local electricity rates, available incentives, and energy output. After the payback period, the system generates essentially free electricity for the remaining 10–15 years of its useful life, making solar carports a strong long-term investment.

Most solar panels carry a 25-year performance warranty and can function effectively for 30+ years with minimal maintenance. The structural carport framework is typically designed to last 25–50 years. Panel output degrades at roughly 0.5–0.7% per year, meaning panels still produce about 82–87% of their original output after 25 years.

Absolutely — this is one of the most popular uses for solar carports. A 10–20 kW system can generate enough electricity to charge one or more EVs daily while also offsetting home energy consumption. Adding an EV charger to your carport setup maximizes both the utility and return on your solar investment.