Commercial solar installations are a great way for companies to lower energy costs. Generally, installing solar panels on businesses costs a bit less per watt because the systems are larger, but the total costs will be higher. In 2025, the average cost for commercial solar panels is just about $2.00 per watt.
On the high end, we talked to a solar customer in Hawaii who spent $100,000 going solar. Dion in Nevada said their 10-kW system cost about $20,000, which is about the national average price for a 7-kW system. What else affects solar installation costs?
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).
Adding a solar battery storage system costs $5,600 to $11,200 installed on average (after tax credits), depending on the capacity, type, and brand. Off-grid solar systems cost $40,000 to $80,000 installed and typically have battery storage and a backup generator to supply power when the solar panel energy is not sufficient.
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