The cost of a 10 MWh (megawatthour) battery storage system is significantly higher than that of a 1 MW lithiumion battery due to the increased energy storage capacity.

1. Cell Cost

     As the energy storage capacity increases, the number of battery cells required also increases proportionally. Assuming the same cost per kWh as mentioned earlier for a midrange quality lithiumion cell ($150 to $300 per kWh), a 10 MWh battery storage system would require 10,000 kWh of storage capacity. Therefore, the cost of the cells alone could range from $1.5 million to $3 million.

2. BMS and Ancillary Equipment

     For a larger battery storage system like 10 MWh, a more advanced and powerful BMS is needed to manage and control the battery cells effectively. The cost of the BMS for such a system could be in the range of $100,000 to $200,000 or more, depending on its complexity and features. Additionally, other ancillary equipment such as cooling systems, fire protection systems, and power conversion systems (PCS) are also required to ensure the safe and efficient operation of the battery storage system. These additional components could add another $200,000 to $500,000 to the overall cost.

3. Installation and Infrastructure

     Installing a 10 MWh battery storage system requires appropriate infrastructure such as a dedicated space, electrical connections, and safety measures. The installation cost can vary depending on the site conditions and the complexity of the installation. On average, the installation cost could be around $300,000 to $500,000. Moreover, if any additional infrastructure upgrades or modifications are needed to accommodate the battery storage system, such as strengthening the electrical grid connection or building a separate enclosure, these costs will add up.

4. Project Management and Engineering

     Designing, engineering, and managing a 10 MWh battery storage project require specialized knowledge and expertise. The cost of project management, engineering services, and system integration can range from $200,000 to $500,000 or more, depending on the complexity of the project and the level of expertise required.

     Overall, considering all these factors, the total cost of a 10 MWh battery storage system could be in the range of $2.5 million to $5 million or even higher, depending on the specific requirements, quality of components, and installation conditions.