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10.5 kw solar system cost may vary depending on the type of panels used, installation costs, and the property's location. However, it can cost anywhere between $15,000 to $25,000 on average. The price can be significantly lower if the property is eligible for government rebates. This solar system is powerful enough to generate electricity for a medium-sized home. By investing in a solar system, homeowners can significantly reduce their reliance on the grid and save considerable money on their electricity bills.