Compare price and performance of the Top Brands to find the best 40 kW solar system. For home or business, save money on monthly. This high-power, low cost solar energy system generates 40,120 watts (40 kW) of grid-tied electricity with (68) 590 watt Axitec XXL bi-facial model PS590M8GF-24/TNH, GoodWe single-phase string inverters, 24/7 monitoring, disconnect box, rooftop mounting,. These are complete PV power systems that can. 48v 1000ah Home Battery Home Solar lithium 50KWH battery Pack $ 8,800. This 40 kwh battery bank design for home solar energy storage system. total 48v 1000Ah in a rack cabinet. 2V 206Ah modules connected in parallel, each LiFePO4 battery module is 10kWh. But how much does this technology actually cost? Let's break it down.