Residential Solar Frequently Asked Questions

Solar ROI is calculated by dividing your total system cost by your estimated annual energy savings. Annual savings are determined by multiplying system output — calculated as System kW × Daily Sun Hours × 365 × 0.75 efficiency factor — by your local electricity rate. Our calculator handles this automatically once you enter your inputs.

Most homeowners can expect a payback period of 6–12 years, though this varies widely by location, electricity rate, system size, and installation cost. States with higher electricity rates (like California or Massachusetts) tend to see faster payback periods. After payback, most systems continue producing free energy for 15–25 additional years.

Yes. Roof orientation, pitch, and material all matter. South-facing roofs with a 15–40° pitch typically achieve maximum output. Shading from trees or chimneys can significantly reduce production, as can roofs in poor condition that may need replacement before installation. Most professional installers provide a site assessment to evaluate your specific roof.

The federal Residential Clean Energy Credit (formerly the ITC) allows homeowners to deduct a percentage of their solar installation cost from their federal income taxes. The applicable percentage may change year to year based on legislation. Consult the IRS website or a qualified tax professional for the current rate and eligibility requirements before filing.

Peak sun hours represent the number of hours per day when sunlight intensity averages 1,000 watts per square meter. In the U.S., this ranges from about 3.5 hours/day in New England to over 6 hours/day in the Southwest. Our calculator pre-fills state-level averages automatically, and you can adjust the slider to match your specific location or seasonal conditions.

Standard grid-tied solar systems automatically shut down during power outages as a safety requirement to protect utility workers. If you want backup power during outages, you'll need a battery storage system (like a Tesla Powerwall or similar). Battery-backed solar systems can keep essential loads running even when the grid is down.

Yes, through net metering programs. When your system produces more electricity than you use, the excess is sent to the grid and you receive a credit on your utility bill. Net metering policies vary significantly by state and utility company — some offer full retail credit while others offer reduced rates. Check with your local utility before assuming net metering is available.

Solar panels are low-maintenance by design. In most climates, rain is enough to keep them clean. In dry or dusty areas, periodic rinsing with a garden hose helps. Inspect for debris, bird nests, or damage annually. Most modern inverters include monitoring apps so you can track output and spot issues early. Quality panels typically come with 25-year performance warranties.