Sanyo Denki describes the development process for the A11H SANUPS Series in this technical report. As information communication technology (IT) has expanded globally, various IT systems have been introduced. Two extremely important factors when considering use of a system are reliability and stable operation or maintenance for devices that are connected to servers, routers, and other network systems. This reliability is also required in the power source that supplies power to the device. Uninterruptible power supplies (UPS) are a large part in this reliability and Sanyo Denki has been able to address the stability, reliability and power quality with the development of this true on-line double conversion system.