Typical installed cost ranges for an 8. 8 kW system span from about $14,000 to $29,000 before incentives. 50/watt, making them ideal for homes with monthly electricity bills of $120-$200 and 855-1,200 kWh usage. Strong ROI Potential: With payback periods of 6-10 years and 25-year savings of $35,000-$45,000, 8kW systems. An 8 kW solar panel system is enough to power some homes, but it'll cost you about $20,880. Why trust EnergySage? How much does an 8 kW solar system cost? How much electricity will an 8 kW solar system produce? Where can you purchase an 8 kW solar system? Is an 8 kW solar system right for you? If. For an 8. The overall price is influenced by equipment efficiency, system design, and regional labor costs; the cost and price can be reduced through. Compare price and performance of the Top Brands to find the best 8 kW solar system with up to 30 year warranty. 15 per watt with the latest, most powerful solar panels, module optimizers, or micro-inverters. For home or business, save money. With Pakistan's electricity tariff now above PKR 60/unit, an 8kW system can save PKR 40,000–55,000 per month — making it one of the highest-ROI investments available to Pakistani homeowners today.