The cost of a high-quality 10kW solar system falls within the range of $9,900 to $26,600. This cost is influenced by factors such as module efficiency, tilt angle, orientation, space required and the geographical location of the solar power system can impact the overall cost. This credit can reduce a $12,000 system cost to $8,400, representing $3,600 in savings that may not be available in 2026. Total Cost Reality: While battery units cost $7,000-$12,000, total installed systems range from $8,500-$17,000 due to installation complexity, electrical upgrades, and. On average, a 10kW solar system will produce about 30 to 50 kilowatt-hours (kWh) per day. Prices vary based on brand, battery type, and installation costs.