This estimate depends mainly on four key factors: panel watt rating (Wp), number of panels, peak sun hours (PSH), and system derate or losses.
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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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A 20W solar panel typically produces between 1. 5 to 2 amps of current under optimal conditions, depending on factors such as sunlight intensity and temperature.
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Most solar professionals recommend sizing your inverter for solar panels between 75% and 115% of your total panel wattage, with the sweet spot around 1:1.
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