×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Gel-cell (VRLA) battery reliability
2

Gel-cell (VRLA) battery reliability

Gel-cell (VRLA) battery reliability

(OP)
Well, I first posted this question in the 'Battery Engineering' forum, but no response after a week, so I figured I'd try another forum containing more members.  

Our insurance inspector voiced concerns over our recent installation of VRLA batteries, and suggested a capacity test even though the batteries are less than one year old.  This is our first VRLA set on a larger system (2000 Amp-hour) - capacity tests are currently scheduled for our 'normal' Lead-Acid sets every five years.  The research I did prior to specifying VRLA did not reveal any serious problems with this style battery - assuming proper maintenance and operation is done - and the pricing and delivery made them especially attractive.  I would like to hear of any negative experiences or known problems with this type of battery that would support our inspector's concerns.

RE: Gel-cell (VRLA) battery reliability

I would suggest that you contact someone at a large telephone company.  The ones I know of, Verizon (formerly GTE) and Bell are using VRLA exclusively in their remote terminals, and are slowing converting out their big wet bath lead acids in their main substations.  The right person at one these companies could probably answer you question quite thoroughly.

RE: Gel-cell (VRLA) battery reliability


Not intending to be overly callous to voiced concerns of your insurance “inspector” but can you tell if are his direction is based in formally reviewed or anecdotal information?  

Possible applicable info at: Thread237-10473 Thread238-21287 Thread238-11254

Much less the journals, or IEEE Stationary Battery Standards Collection, or
IEEE Std 1184-1994  Guide for the Selection and Sizing of Batteries for Uninterruptible Power Systems  
IEEE Std 1187-1996  Recommended Practice for Installation Design and Installation of Valve-Regulated Lead-Acid Storage Batteries for Stationary Applications  
IEEE Std 1188-1996  Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications  
IEEE Std 1189-1996  Guide for Selection of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications  
http://standards.ieee.org/reading/ieee/std_public/description/powergen/1375-1998_desc.html
http://standards.ieee.org/reading/ieee/std_public/description/powergen/450-1995_desc.html
http://standards.ieee.org/reading/ieee/std_public/description/powergen/484-1996_desc.html

http://www.cdpowercom.com/ or http://www.gnb.com

Besides comms, the rail industry seems to have a lot of {however small} stationary dc in extreme environments.  Then there’s notable shops like Albér, too.  

While not intending to suggest biting the hand that may someday feed you, they may be thought of a most pessimistically manic aspect of business ventures.

However, there currently seems to be some very serious designs of VRLA “rackage” out there.
  

RE: Gel-cell (VRLA) battery reliability

Excellent reply busbar!  You deserve a star.

RE: Gel-cell (VRLA) battery reliability

Battery technology sucks.  Unfortunately, it is about the best we have (whether rotary is better is debateable).  In general, distrust your batteries.

VRLA's have a typical life of 5 to 8 years (regardless of warranty claims).  Testing every 5 years seems like too long an interval.  Every year sounds about right.  Every 6 mos or quarter would not be excessive in a critical application.

Wet cells have a typical life of 15 to 20 years.  5 year testing is reasonable, although if you are really worried about it I'd test them every year, too.

Unfortunately, there is a tradeoff, as each discharge test will also decrease the life of your battery.

Keep in mind one bad jar can kill your whole string.  Even if your system has 3 or 4 parallelled strings, you might lose 25 or 50% of your capacity after a year due to 1 or 2 failed jars, and not even realize it unless you either do a load test or check the impedance of each jar.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close