In 2025, a 15 kW solar panel system costs around $36,300 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. . A typical rooftop solar unit costs around $2. 5 to $5 per watt without factoring in the universal federal tax credit and other solar rebates. This means you could end up spending $37,500 to $75,000 on a 15kW solar arrangement. Buy the lowest cost 15 kW solar kit priced from $1. Whether you need a small 5kW system or a large 15kW solar kit, our factory-direct model. . A 15kW solar system has the potential to save you a significant amount of money on your electricity bills. This size of array is significantly larger than the average. .
