The client, with a focus on participating in ancillary services markets and remotely controlling batteries through their supervisory control system, required a solution for precise regulation of battery output and seamless communication. AMOS addresses this by enabling the client to participate in the Fast Frequency Reserve (FFR) ancillary service, achieving rapid battery discharge within 700 milliseconds of a grid frequency drop. The system ensures precise regulation of battery output to meet client-set points and facilitates communication through the Modbus TCP protocol. AMOS also provides a comprehensive overview and diagnostics of the battery system. The result is a practical solution that meets the client's specific requirements, allowing them to efficiently participate in ancillary services markets, control batteries remotely, and maintain a thorough understanding of their battery system's performance.