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Uninterruptible Power Supplies

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This page is intended to cover the basics involved with maintenance and repair of the general category of Uninterruptible Power Supplies

Definition[edit | edit source]

An Uninterruptible Power Supply, also called a UPS, is a device that supplies power to a connected load when the main power source is removed, usually through application of a battery that is otherwise charged from the main power source. This can be used to ensure enough time for a power down sequence, a bit of extra work time, or even an interim supply of power while switching from one power source to another. Typically, the device uses a sealed lead acid battery, but other technologies are available, such as lithium ion, and supercapacitor.

For individual UPS models or model series, please check for their own pages in the wiki. Many diagnostic procedures will remain the same across a number of models from a specific brand.

Header Text[edit | edit source]

Problem Solution

Device indicates overload condition

  • 1. Check voltage on battery pack with device off, check that battery is at least 12.6V for every 12V in original specified voltage

2. If multiple batteries are used to make up a pack, make sure that each has at least 12.6v at rest. 3. Reconnect battery pack and continue to test as UPS turns on, most will load test on initial startup, make sure the voltage on the battery pack does not drop under 11V for every 12V on the pack. If it does, pack is bad, or load must be reduced to accommodate the overload condition


  • Solution2
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