On average, a 3 kW solar panel system costs $9,150, according to real-world quotes on the EnergySage Marketplace from 2025 data.
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As of April 2026, the average solar panel system costs $2. 51/W including installation in California. 05 kW system (the average system size in California), this comes out to about $22,697 before any available incentives, though prices range from $19,292 to $26,102.
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Follow a structured process to connect your solar panels to the grid, including preparing the electrical panel, installing a dedicated circuit breaker, wiring the inverter, and setting up a utility disconnect switch. Familiarize yourself with net metering to maximize your energy.
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The pie chart indicates the number of plants per energy source in the region. Click a region to show the region's total energy capacity in the bar chart at the top of the filter panel.
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