How long should a UPS last?
A well-maintained UPS can provide many years of reliable service and there's no single point at which every system should be replaced.
The operating environment, loading, maintenance history and availability of manufacturer support can all have as much bearing on its useful life as the date it was installed. For organisations relying on a UPS to protect critical operations, the more important question isn't simply how old the system is, but how much confidence you can place in it for the years ahead.
The UPS and its components all age differently
UPS batteries, fans and capacitors are all service-life components and shouldn't be confused with the expected service life of the UPS itself.
Depending on battery type, operating conditions and usage, batteries will typically require replacement multiple times during the working life of a UPS. The condition of the batteries should therefore be assessed as part of routine preventative maintenance rather than using their age as an indication that the complete UPS needs replacing. Other consumables and components within the UPS also age, however. Cooling fans, capacitors and electronic components are all subject to wear or deterioration over time, making preventative maintenance increasingly important as a system gets older.
What determines the working life of a UPS?
Two identical UPS systems installed on the same day won't necessarily age at the same rate.
Operating temperature and environment can have a significant effect, particularly on batteries and other temperature-sensitive components. Loading is another consideration: a UPS consistently operating close to its maximum capacity has a very different duty profile from one operating comfortably within its design limits. Regular preventative maintenance plays an important role in maximising the useful life of a UPS. Routine inspections can identify deteriorating batteries, cooling issues, component wear, alarms and other developing problems before they result in failure. Changes to the critical load, particularly increases, must also be considered. The UPS may remain perfectly serviceable, but may no longer provide the capacity or runtime required for the equipment it now supports.
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Working doesn't necessarily mean supportable
This is perhaps the most important consideration with an ageing UPS.
A system can be operating perfectly well today but have reached a point where manufacturer support is reducing, specialist components are becoming difficult to obtain or particular parts have been discontinued altogether. That doesn't necessarily mean the UPS should immediately be replaced. It does mean the consequences of a future failure need to be considered. If a replacement component is no longer readily available, what might once have been a straightforward repair could become a considerably more disruptive problem. At this stage, UPS replacement becomes less about the age of the equipment and more about managing operational and business-continuity risk.
When should UPS replacement be considered?
There isn't a universal replacement age. Instead, organisations should consider the overall condition and supportability of the system.
Increasing faults, rising maintenance expenditure, declining efficiency, restricted parts availability, changes in load requirements or significant expenditure being required on an ageing UPS can all indicate that replacement deserves consideration. Planned replacement also provides the opportunity to assess whether the original UPS specification still reflects the organisation's requirements, rather than simply replacing an old system like-for-like.
Plan ahead rather than wait for failure
An ageing UPS doesn't automatically need replacing, and a properly maintained system may have considerable useful life remaining. The important thing is to understand its condition, its support status and the consequences should it fail.
NSSE provides preventative maintenance, battery replacement, lifecycle assessments and UPS replacement solutions across a wide range of manufacturers and technologies. We can help organisations assess existing systems and determine whether continued maintenance or planned replacement represents the most appropriate approach.
The question shouldn't simply be, “How old is our UPS?” Instead, “How much confidence do we have that it will support our operations when we need it?”
