Welcome to the new Schneider Electric Community

It's your place to connect with experts and peers, get continuous support, and share knowledge.

Close
Important Announcement: WELCOME to the new Schneider Electric Community! Community is now no longer part of Exchange, and is now rebranded under se.com. If you have any bookmarks and links saved, we request you to update them to ensure that you continue accessing our community from this new location. For any issues that you might encounter as part of this change, please reach out to SchneiderCommunity.Support@se.com, and the team will help to get your issues resolved.
Invite a Co-worker
Send a co-worker an invite to the Exchange portal.Just enter their email address and we’ll connect them to register. After joining, they will belong to the same company.
Send Invite Cancel
82514members
350118posts

Do inverters etc, wear out?

APC UPS Data Center & Enterprise Solutions Forum

Schneider Electric support forum for our Data Center and Business Power UPS, UPS Accessories, Software, Services, and associated commercial products designed to share knowledge, installation, and configuration.

Solved
bsapach_apc
Crewman
Crewman
0 Likes
2
146

Do inverters etc, wear out?

This was originally posted on APC forums on 4/23/2012


I've got a SUA1500RM2U that recieved new batteries in 2009. The UPS reports 23 minutes of runtime at 35% load. According to APC's specs the unit should reach 45 minutes of runtime at that load. I don't remember what runtime was being reported when the batteries were replaced but 3 years (and only about 4 major power events) later and runtime is horrible, is this normal?

We're seeing this same scenario play out in other UPS units, some that were stocked with APC batteries and others with compatible parts. So the brand of battery is a factor but so is the age of the UPS, since they're all right around 10 years old. My question is, do inverters etc. wear out over time? Should we be replacing entire UPSes??


Accepted Solutions
bwank_apc
Crewman
Crewman
0 Likes
0
146

Re: Do inverters etc, wear out?

This was originally posted on APC forums on 5/3/2012


UPS's integrate three systems: a rectifier, one or more batteries and an inverter for each phase served. Electrolytic capacitors in both, rectifiers and inverters have been reported for many years to dry out, thereby losing their capacity and increasing their internal resistance. This in turn accelerates self heating and an ever increasing speed of the wear-out mechanism. Memory, which holds the firmware, and interconnects are also particularly sensitive to absolute temperature and temperature cycling, producing additional stresses on electronics, which can cause premature power electronics failure. These can be quite catastrophic if the power stage blows up during cascading events that did not lead to a controlled, rapid shutdown within microseconds. Batteries, based on their electro-chemical storage mechanism, fail slower, but are even more sensitive to temperature, discharge rates and charge/discharge cycles. Hence traditional fuel gauging is insufficient to determine state of charge, let alone state-of-health. At infiniRel we have developed a technology to determine capacitor wear-out non-invasively, while the unit is operating. We intend to further develop the technology to include battery health and I'd encourage you to send us your feedback via the above website.

See Answer In Context

2 Replies 2
BillP
Administrator Administrator
Administrator
0 Likes
0
146

Re: Do inverters etc, wear out?

This reply was originally posted by Chris on APC forums on 4/24/2012


Batteries generally last 3 to 5 years. The inverters themselves do wear out over time as does anything else however that would not affect the runtime as it's not necessarily related(inverter and run time). We usually consider 10 years the lifetime of a smart ups so I would suggest trading up to a new UPS. This doesn't necessarily mean the UPS will not last longer but as the UPS and it components age, they are more likely to fail.

bwank_apc
Crewman
Crewman
0 Likes
0
147

Re: Do inverters etc, wear out?

This was originally posted on APC forums on 5/3/2012


UPS's integrate three systems: a rectifier, one or more batteries and an inverter for each phase served. Electrolytic capacitors in both, rectifiers and inverters have been reported for many years to dry out, thereby losing their capacity and increasing their internal resistance. This in turn accelerates self heating and an ever increasing speed of the wear-out mechanism. Memory, which holds the firmware, and interconnects are also particularly sensitive to absolute temperature and temperature cycling, producing additional stresses on electronics, which can cause premature power electronics failure. These can be quite catastrophic if the power stage blows up during cascading events that did not lead to a controlled, rapid shutdown within microseconds. Batteries, based on their electro-chemical storage mechanism, fail slower, but are even more sensitive to temperature, discharge rates and charge/discharge cycles. Hence traditional fuel gauging is insufficient to determine state of charge, let alone state-of-health. At infiniRel we have developed a technology to determine capacitor wear-out non-invasively, while the unit is operating. We intend to further develop the technology to include battery health and I'd encourage you to send us your feedback via the above website.