With professional installation, a typical 6-kilowatt residential solar panel system in California costs $14,669. That price drops to $10,055 after using the full federal solar investment tax credit (ITC).
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As of April 2026, the average solar panel system costs $2. 57/W including installation in San Diego, CA. 9 kW system (the average system size in San Diego, CA), this comes out to about $17,769 before any available incentives, though prices range from $15,104 to.
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Monocrystalline solar panel cost ranges from roughly $2. 50 per watt for the panels themselves, with total installed prices often landing between $2.
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Currently, the average monocrystalline solar cell price is about $1 to $1. 20 per watt, but this can vary based on factors including the brand and the retailer.
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