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#1 larrybl OFFLINE  

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Posted January 09, 2016 - 07:32 PM

I had to go in to work today for a UPS Failure. This is a 25kva unit that uses three strings of 12V batteries (36 total). We had planned to replace the batteries later this year. The site had went "dark" and I by-passed the UPS. The batteries came in, but they had to go get a pry bar to remove the old swollen ones.

Batteries were 6 years old, and due to budget constraints could only be budgeted for replacement this year. I opted to go with one string of 12, as we only pull 1.2kva, and have a site generator. 

 

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#2 KennyP ONLINE  

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Posted January 09, 2016 - 07:46 PM

That's a chunk of change setting there!


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#3 Marty'70 OFFLINE  

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Posted January 09, 2016 - 08:33 PM

That's a chunk of change setting there!


You ain't kidding!
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#4 larrybl OFFLINE  

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Posted January 09, 2016 - 08:34 PM

Over 5K, just to replace 12 batteries. I questioned why after 6 years the batteries got in this condition. Over charging or what. The technician said that the company that made these batteries went bankrupt in 2011 and they had the same type issues with many of their batteries. I am looking in to replacing this UPS with a Eaton unit, but we are looking at a 35K price tag.


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#5 MH81 ONLINE  

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Posted January 09, 2016 - 11:41 PM

Most. Of the little UPS units I've seen have a bad, swollen battery.
Also, most of them have a charging output that seems to be around 10v higher than they should be.

#6 larrybl OFFLINE  

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Posted January 09, 2016 - 11:48 PM

This isn't a little UPS, and not a cheep one, Around 35 to 45 Thousand. It shouldn't have fried the batteries like this.


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#7 toomanytoys84 ONLINE  

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Posted January 09, 2016 - 11:59 PM

We have a large battery back up for our gas monitoring system and tracking system. It was an array of 12v deep cycle batteries. I never messed with it much other than changing out the batteries. Probably a similar set up to what you have there.

We replaced the batteries in it yearly. Probably overkill.

we also had a large propane generator that was dedicated to that room and computers.

The battery backup was just used for the switching lag between the line power and the generator auto start and to transfer

#8 larrybl OFFLINE  

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Posted January 10, 2016 - 12:04 AM

This was originally specified without a back up generator to run 10+ hours on battery. WE have a 25Kva generator so with a single string of 12 batteries is plenty.



#9 glgrumpy ONLINE  

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Posted January 10, 2016 - 01:05 AM

Uhhh! What?  UPS delivers packages! :smilewink: :(


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#10 Marty'70 OFFLINE  

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Posted January 10, 2016 - 07:42 AM

Uhhh! What?  UPS delivers packages! :smilewink: :(


Hahahahaha ihadto look it up myself to know what they were talking about.

#11 MH81 ONLINE  

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Posted January 10, 2016 - 08:17 AM

This isn't a little UPS, and not a cheep one, Around 35 to 45 Thousand. It shouldn't have fried the batteries like this.


Be interesting to know what it's charging to.
14 is one thing, 16 or 18 or even 20+ is a problem

#12 larrybl OFFLINE  

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Posted January 10, 2016 - 09:01 AM

Be interesting to know what it's charging to.
14 is one thing, 16 or 18 or even 20+ is a problem

I will be checking that tomorrow. Here is what the Un-interruptible Power Supply (UPS) looks like. A control cabinet and two battery cabinets. 

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#13 HDWildBill ONLINE  

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Posted January 10, 2016 - 10:05 AM

When I worked in IT we had UPS to back up the all the servers, we had about 20 servers,  there was a constant issue with the batteries.  So our manager put in this sophisticated system with a generator.  He would test it every Wednesday to make sure it worked.  Then one day I came to work to find him starting up the servers.  The power went out over night and the system failed!  He was pissed!  That day there were 3 techs plus a VP looking at the system.  No matter how good you think the system is, failure is always an option!

 

I think Alan has a very good point in checking the charging voltage.






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