Uninterruptible Power Supply (UPS) has an important role for a system that requires a backup voltage source to keep the system running even if the main voltage source is interrupted. When the main voltage source of a system is disturbed, the UPS will switch from the main voltage source to the battery owned by the UPS without disconnecting the source to the system so that the system continues to operate as if it were getting a main voltage source. When the main power source is off, the UPS cannot be a source of power for the system forever because the UPS has certain limitations such as battery capacity. In this case, it happened at the Balikpapan State Polytechnic data center, the server died because the battery was not charged by the generator when the power source from the State Electricity Company (PLN) went out. To anticipate UPS outages in the Balikpapan State Polytechnic data center, this monitoring tool needs to be built so that it can monitor the capacity level of battery usage, by designing early warnings in the form of several indicators such as pilot lights, alarm bells and mini sirens. For a system that has a large infrastructure, the death of one of the large infrastructure will cause disturbances and can even completely shut down the system. Therefore, UPS can only back up the system for a certain time or condition. In fact, it is very difficult to monitor the UPS manually. The experimental results obtained data that the values on the UPS can be viewed and monitored online and it was found that the value of the voltage sourced from PLN was 230 VAC while the value of the voltage sourced from the battery was 12 VDC.