Compare price and performance of the Top Brands to find the best 10 kW solar system with up to 30 year warranty. 10 per watt with the latest, most powerful solar panels, module optimizers, or micro-inverters. . Strong ROI in Specific Markets: 10kW batteries deliver 5-7 year payback periods in markets with high time-of-use rate differentials (like California's NEM 3. A 10kW solar power system usually covers 55 to 70 square meters and can generate up to 16,700 kWh of electricity annually. Prices vary based on brand, battery type, and installation costs. We'll also. . This affordable, high-efficiency 10. 3 kW solar kit rated includes Peimar 450 watt all-black mono-Perc panels model DR10H450M, SMA Sunny Boy Smart Energy SBSE hybrid inverter, 24/7 monitoring, rooftop mounting, permit-ready building electrical plans,.