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What is a UPS emergency power supply?

A UPS or Uninterruptible Power Supply is a backup battery that you can use to power your important electronics such as a PC and Internet modem in the event of a power failure. You plug the UPS emergency power supply into the wall outlet and then connect the mains power cable from your PC and Internet modem to the UPS's outlets. In the normal situation where there is just mains power on the wall outlet, the UPS emergency power supply transmits mains power to all connected devices. In addition, the electronics in the UPS emergency power supply ensure that the built-in battery in the UPS remains in good condition and sufficiently charged. If the mains voltage fails due to a power outage, for example, the UPS emergency power supply immediately detects this. The UPS's electronics switch to emergency consumption, where the electronics in the UPS convert the DC voltage from the battery to mains voltage to power the connected equipment. This switchover process occurs so quickly that the connected equipment does not notice the switchover and continues to operate as usual. Thus, the mains power for the connected equipment remains uninterrupted. Hence the name Uninterruptible Power Supply or UPS.

Why buy a UPS emergency power supply?

There are several situations in which a UPS emergency power supply is an important link in an IT facility. Anyone who has ever experienced it knows what can happen. You are working on a document and suddenly for some reason the mains power fails. This can happen because a fuse blows, or because of a power supplier outage. The failure of your computer prevents you from continuing to work, which is annoying, of course. But the consequences can be much more far-reaching. The moment the power fails, your PC can no longer save the files you are working on. As a result, you lose the data you entered since the last time you saved the file. But the consequences can be even more disastrous. In a worst-case scenario, the file you are working on may also become corrupted, rendering the data inaccessible. With a small text file, the damage is often manageable. But consider a large customer file or another database important to your operations. With a UPS emergency power supply of sufficient capacity, these problems can easily be prevented.

Important specifications


The output power indicates how heavily the UPS can be loaded. The maximum output power is indicated in two values: watts and VA, where the number of watts a UPS can deliver is always smaller than the number of VA. Here it is important that both the number of watts and the number of VA of the connected equipment do not exceed the maximum number of watts and the maximum number of VA of a UPS emergency power supply. Watts is the actual power absorbed by a device that can be converted into labor or heat? VA is the apparent power absorbed by a device. It is the product of the maximum AC voltage and the maximum AC current that a device can absorb or, in the case of a UPS, deliver. The power in VA is therefore also called the apparent power. If either value is exceeded, the UPS emergency power supply is overloaded and will not be able to supply the connected equipment with sufficient power and shut down. If you know both values, choose a UPS emergency power supply whose actual power in watts and apparent power in VA are both greater than or equal to that of the equipment to be connected.

Battery capacity and other features


It's easy to calculate how long your equipment can operate on your UPS emergency power supply during a power failure. Multiply the number of batteries in your UPS by the battery voltage and the number of amp-hours. You then have the total number of watt-hours (Wh). Divide the number of watt-hours by the load in watts and you know how long your equipment can continue to operate until the battery runs out. Many UPSs have a communication jack. This connection allows the UPS to tell the connected equipment that the battery is running low, allowing the connected equipment to safely shut down. The corresponding communication software can be downloaded from the manufacturer's website. There are three different types of communication connections:

  • the older RS 232 serial connection that can be connected directly to RS 232 of a server or PC;
  • the modern USB connection. This can be connected directly to a USB connection of a PC or server; <;LI>
  • the UTP network connection. This connects the UPS directly to your LAN. All connected equipment can listen to messages from your UPS via the LAN.