As of recent data, the average cost of a BESS is approximately $400-$600 per kWh. Here's a simple breakdown:. The total cost of the project is said to be $29 million. Jointly owned by SPEC and its listed parent Alternergy, the project will meet more than 20 percent of Palau's energy needs. In this article, we will analyze the cost trends of the past few years, determine the major drivers of cost, and predict where. . Major projects now deploy clusters of 20+ containers creating storage farms with 100+MWh capacity at costs below $280/kWh. Technological advancements are dramatically improving solar storage container performance while reducing costs. This translates to around $200 - $450 per kWh, though in some markets, prices have dropped as low as $150 per kWh. Input power (kW) Short circuit protection;OCP,OVP,LVP,OTP,residual current detection.