First, you can use an online solar cost calculator, like this one powered by solar . Simply punch in your address and your average monthly electricity bill, and the calculator will give you
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A 4 kW solar panel system costs $11,200 in 2025 before incentives. A 4 kW solar panel system produces about 5,808 kWh of electricity annually, but the exact amount depends on where you live and how much sun you get. DIYing a 4 kW solar panel system usually isn't your best bet: You're much better off hiring a professional solar company.
Cost per kWh shows the lifetime cost of solar electricity by dividing your net system cost by total expected energy production over 25 years. This typically ranges from 6-8 cents per kWh, compared to current grid electricity averaging 16.44 cents per kWh nationally.
In 2025, a 4 kW solar panel system costs around $11,200 before incentives, based on real installation data from across the country. But your actual price will depend on factors like your roof’s complexity, local labor costs, the equipment you choose, and what incentives are available in your area.
A 4 kW solar panel system generates approximately 5,808 kWh of electricity each year. That’s enough to keep 106 TVs running, power 4 refrigerators, or meet the energy needs of a small household (the average U.S. shopper on EnergySage needs about 12 kW of solar). But what else could it do?
