How much does a 3-kW solar system cost? A solar panel system with 3 kW of capacity typically costs around $8,000 to $10,000, according to our research. If your monthly electricity usage ranges from 300 to 500 kWh, this system size could help you reduce your utility bills, cut carbon emissions, and take advantage of federal and local. A 3 kW solar system will generate between 260 and 415 kilowatt-hours of electricity per month, depending on where it is installed. That's about $50 worth of electricity. 66 per watt, a 3 kW — or 3,000 watt (W) — solar system costs an average of $7,980, or $5,905 after factoring in the 26% federal solar tax credit. The solar tax credit is expected to drop to 22% in 2023, so the. For that price, you should get seven solar panels, each with a 450-watt peak power rating, along with a 5kWh battery. This estimate is based on a household experiencing average UK irradiance with a 3. 5kWp solar panel system and.
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