Life Expectancy of a UPS?

Life expectancy of a UPS depends on its working environment, the load it protects and whether it is been regularly maintained and serviced
Many clients ask us this question and as you would expect there is no hard and fast rule. However as a rule of thumb, we would say 10-15 years is the absolute maximum life expectancy of a large UPS power system.

Uninterruptible Power Supplies are very reliable and with regular maintenance will last and last but something that clients often do not appreciate with their old UPS is the amount of energy that it is wasting. Modern UPS can be 96% + efficient and even more for TRUE on online double conversion UPS models but a 15 year old UPS model will only have been 70%- 80% efficient at time of manufacture and with age, we have seen efficiencies as low as 50%. This is particularly the case if the UPS is not significantly loaded and if the phases are unbalanced.

Over a year this can amount to a significant cost for wasted electricity, which then makes buying a brand new UPS a very smart return on investment.

So for a rule off thumb we suggest the following guide:


  • Small UPS of low voltage – Max 5 Years
  • Large UPS Floor Standing – 10 to 15 years maximum
  • Critical UPS systems – Mission Critical – 10–12 years maximum

Batteries of course have a shorter life – Check your supplier

For more information on UPS power systems contact Power Continuity on 0845 055 8455 – Our UPS engineers are here to help you

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