How much does 500kw energy storage cost1. The approximate cost of a 500 kW energy storage system can range between $300,000 to $600,000, depending on various factors including technology type, installation complexity, and local market conditions. If there is no electrical equipment in use, please inform PVMARS of your budget and we will configure it according to your). Note: The output voltage designed for the 500kW PCS on this page is three-phase 380v-415v If you request dual voltage 120v/240v,please leave a message about the required. Let's face it: when someone Googles 500kW container energy storage price, they're not just window-shopping. These systems are like the Swiss Army knives. The energy storage system consists of a battery pack, battery management system (BMS), and battery charger.