How Much Does a 15kW Solar Panel System Cost
In 2025, a 15 kW solar panel system costs around $36,300
The price per watt for solar panels can range from $2.50 to $3.50 and largely depends on the home's geographical area. Residential solar panels are usually sized between 3 kW and 8 kW and can cost anywhere from $7,500 to $28,000 in total installation costs. See average solar panel system costs by size (before tax credits or discounts).
As of 2024, the average cost of solar panels in New York is $3.30 per watt, making a typical 6.9 kilowatt (kW) solar system $16,632 after claiming the 30% federal solar tax credit now available. This is higher than the average price of residential solar power systems across the United States, which is currently $3.00 per watt.
The overall cost of solar can be influenced by the solar incentives available. Across the U.S., homeowners can apply for the federal solar tax credit. The solar tax credit makes installing solar more cost-effective by providing homeowners with a tax credit equal to 30% of the cost of their installed solar panel system.
Some of the factors that affect solar power system installation costs for specific homes include: Homes that use more electricity will need more solar panels to cover their energy needs. Although solar panels do get cheaper on a per-watt basis, the overall cost of the system will increase as more panels are added.
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