The total cost of a commercial solar installation usually ranges from $200,000 to $350,000 for a 100 kW system, which is about $2 to $3.5 per watt. However, actual costs depend on system size, roof conditions, location, and utility requirements. Businesses in Midwest may also qualify for local incentives that further reduce the out-of-pocket cost. Federal tax credits (currently 30%) and accelerated depreciation (MACRS) can significantly lower the total investment.