The cost will depend on a number of factors, including operating duration, utility rate structures, demand charges and additional fees. Costs include system price. . The term 50 kW solar plant cost refers to the total investment required to build a solar power system with a 50 kilowatt capacity. Optional solar mounting support, PV combiner boxes, and cables. PVMARS provides a complete turnkey PV energy storage system solution. . This 30/50kW all-in-one industrial energy storage system combines lithium batteries, inverter, and intelligent energy management in a single unit, offering a flexible solution for medium and large industrial projects. The Commercial & Industrial 30kW 54.