I like these...
https://www.dropbox.com/s/eltaidav6g0o392/Screenshot%202016-06-02%2010.50.28.png?dl=0
On 6/1/2016 12:24 PM, Paul McCall wrote:
Some our remote towers can have outages lasting several hours several
times a year. We have gotten good lifespans on the AGMs and we are
probably leaning that way, the more I investigate the situation. I
have a local dealer that buys 20K of a couple particular model per
month, so am able to get the AGM price down with Free delivery. Can
get a 105ah for $ 180 or an 80ah for $ 140 so that’s what I am leaning
towards since the AGMs have done so well for us. Am also switching
most everything to 48v (from 24v) so that is a factor in my
calculations on run-time needed etc.
Paul
*From:*Af [mailto:[email protected]] *On Behalf Of *Chuck McCown
*Sent:* Wednesday, June 1, 2016 10:12 AM
*To:* [email protected]
*Subject:* Re: [AFMUG] Deka 7T31 non-AGM batteries
Flooded cells can last >20 years.
*From:*Ken Hohhof <mailto:[email protected]>
*Sent:*Tuesday, May 31, 2016 3:50 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Deka 7T31 non-AGM batteries
Paul, how often do you change the batteries? And how often do they
get discharged?
The small ones I try to change every 2 years, but the 100Ah and larger
AGMs seems to last 5 years or more. Our towers only have a handful of
power outages per year though.
Most of our big batteries are Concorde (marine or solar) or
Northstar. I suspect any name brand US manufactured AGM batteries
would have similar life.
*From:*George Skorup <mailto:[email protected]>
*Sent:*Tuesday, May 31, 2016 4:24 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Deka 7T31 non-AGM batteries
I just use AGM everywhere. Screw maintaining wet cells.
On 5/31/2016 11:14 AM, Paul McCall wrote:
We have 22 towers that have the battery plant indoors. 4
batteries at $ 100 each vs $ 200 each (Optima D31M) saves $ 400
per tower ($ 8800 total)
We need to be doing routine maintenance and inspection on each
tower anyways every 6 months or so.
The cost savings is something to consider.
For outdoor, we can stick with AGM.
Paul
*From:*Af [mailto:[email protected]] *On Behalf Of *Jesse DuPont
*Sent:* Tuesday, May 31, 2016 11:27 AM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] Deka 7T31 non-AGM batteries
Adding to what Chuck said, you'd also only want to use flooded
batts in a vented space. AGM are safer in sealed enclosure.
*_Jesse DuPont_*
Network Architect
email: [email protected]
<mailto:[email protected]>
Celerity Networks LLC
Celerity Broadband LLC
Like us! facebook.com/celeritynetworksllc
Like us! facebook.com/celeritybroadband
On 5/31/16 8:27 AM, Chuck McCown wrote:
Flooded cells will have the lowest price per watt hour and the
longest life if in a temp controlled environment.
However, they are classified as hazardous materials due to the
amount of liquid electrolyte and that may affect zoning and
insurance (if any one asks).
I would not use a lead acid flooded cell unless it was in a
temp controlled environment.
If you have 120 batts to replace, sounds like they might be
outdoors. I would use AGM.
*From:*Paul McCall <mailto:[email protected]>
*Sent:*Tuesday, May 31, 2016 7:38 AM
*To:*[email protected] <mailto:[email protected]>
*Subject:*[AFMUG] Deka 7T31 non-AGM batteries
Guys,
We have always used the Optima D31M AGM batteries (just
because). Well…. It’s that time… time to replace 90% of them,
and looking for alternatives. Having to buy 120+ batteries…
cost becomes something to at least look at.
My local supplier says that FPL (Florida Power & Light – aka
Florida Flicker and Flash) uses the Deka 7T31 non-AGM
batteries (Lead Acid) and they are a lot cheaper (waiting on
price – I found them quickly for $ 100 each). They are a
100ah batteries. Here is the spec otherwise
http://www.eastpennmanufacturing.com/wp-content/uploads/Deka-Commercial-Batteries-Flyer-0010.pdf
(minus the ah rating which I got from Deka over the phone).
Does lead acid have distinct disadvantages from AGM? Also,
anybody using Li-Ion yet for a tower battery bank? Probably
not cost-effective ?
Paul
Paul McCall, President
PDMNet, Inc. / Florida Broadband, Inc.
658 Old Dixie Highway
Vero Beach, FL 32962
772-564-6800
[email protected] <mailto:[email protected]>
www.pdmnet.com <http://www.pdmnet.com>
www.floridabroadband.com <http://www.floridabroadband.com>
