Which UPS mode should I use?

The answer which UPS mode should I use, very much depends on the following main factors:

  1. How critical the load backed by the UPS is
  2. Sensitivity of your equipment to power cuts
  3. How important lower running (and in particular energy) costs are

When looking for UPS’s, you will see headline figures of up to 99% efficient. Often UPS mode called ECO mode. This generally involves running the load directly from the mains, (via a static switch internal bypass) with the inverter switched off.

As soon as a power cut is detected by the UPS, the unit switches to true Online operation in milliseconds. Performed through the inverter.

Going back to the three factors above, if your equipment has enough lag in its power drag, not to be interrupted by a 0.2 second power cut, then UPS ECO mode would be fine.

However if this is not quick enough, remain within the less efficient Online mode.

The only other thing to mention is modern UPS systems often have a smart ECO mode where the UPS will automatically decide which mode to operate in based on the stability of your mains. It will try and operate in the most efficient mode wherever possible. If it starts to see that your mains is slightly unstable, it will switch over to Online mode. Different UPS manufacturers even have self learning algorithms that constantly improve their decision making based on the site.

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