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ITFrequently Asked Questions · UPS
What information and indications does a UPS give me?
Depending on its type, a UPS can tell you about: battery status and charge level, input and output voltage, voltage fluctuations, the need to replace the battery, and a fault in the UPS. This information is shown through indicator lights or audible warnings.
A UPS's indications help you understand what is happening with the power and when you need to act. The simplest models have only LEDs and audible alarms; others have a display showing voltage, load and estimated runtime. Many can also connect to a computer via USB or a serial port, while larger units accept a network card for remote monitoring and notifications.
Audible alarms mean different things depending on their pattern. Typically, an intermittent beep every few seconds means the unit is running on battery, while a faster or continuous tone warns of low battery, overload or a fault. The exact meaning of each indication is described in the model's manual.
In practice, the most useful piece of information is the battery replacement warning, which usually appears after an automatic self-test. Batteries typically last 3–5 years, depending on temperature and use.
A common mistake is muting the buzzer because it is annoying and then ignoring the indications. A UPS with a worn-out battery appears to work normally until the first power cut. Install its software so that you receive notifications and get an automatic shutdown.