I would be interested in learning more about it.
Anthony
Broadband Corp.
Russ Kreigh wrote:
Yeah, it's completely possible, and will work.... well, at least once, until
the batteries are gone and need to be recharged.
The issue is the duty-cycle of the charger, your going from a 14ah to 100ah
charge load, the charger has to run 7-times as long to fully charge the
batteries, this may work fine with some higher end UPS, and some it might
burn up the charger.
Another thing to make note of, is that most UPS systems run an internal 24V
system, and not a 12V system, so be SURE which one you're dealing with
before you start any modifications.
We're in process of developing our own remote-site power solution.
Everything we've found is either too big physically, requiring expensive
outdoor enclosures, or doesn't have the run-time we desire, or is too
expensive.
I think we've got the basic design down, we're adding things like a local
power input option, so that in a long extended outage we can drop the
generator off to charge the batteries and run the system, and when the
utility power is restored, it will switch back automatically.
We're also looking into a direct 12v input from a vehicle cigarette lighter
output, or additional external batteries.
Would anyone have any interest in this when we get it complete?
Thanks,
Russ Kreigh
Network Engineer
OnlyInternet.Net
Supernova Technologies
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of paul hendry
Sent: Sunday, March 04, 2007 12:09 PM
To: [EMAIL PROTECTED]; [email protected]
Subject: RE: [WISPA] External battery on UPS
Scott,
Surely it should be possible to replace 2 12v 7ah batteries run in
parallel (not series) with 1 12v 100ah battery as the voltage isn't
changing? With regards runtime I can just increase the external battery
count.
Mac, don't worry I have no intention of putting my tongue on these
things to see if they charged ;)
Cheers,
P.
-----Original Message-----
From: Scott Reed [mailto:[EMAIL PROTECTED]
Sent: 02 March 2007 12:22
To: WISPA General List
Subject: Re: [WISPA] External battery on UPS
The charger is designed for the size and number of batteries in the
original configuration. Changing the quantity and/or type of battery
risks damaging either the charger or the batteries.
Also, runtime is determined by the batteries, so changing them changes
the runtime.
paul hendry wrote:
Is anyone using external batteries on the larger APC UPS's? I've got
an
old Smart-UPS 3000 RM that has 8 x 12v batteries in it. The thing is
they are wired in a bit of a strange config. It looks to me like they
are split into 4 sets of 2 batteries running in series then 2 of those
sets are cabled to the same connector inside the UPS and so there are
2
connectors with 4 batteries hanging of each.
Is there any reason I can't run 2 x 2 (in series) 12v 100ah batteries
instead of the original 8? I don't seem to be able to and don't really
want to get another 4 batteries just to discover I can do it with 4.
Cheers,
P.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On
Behalf Of Mark Nash - Lists
Sent: 16 November 2006 16:45
To: WISPA General List
Subject: Re: [WISPA] External battery on UPS
I replaced the two internal batteries last night with two external,
$100
batteries, and put a load on the UPS that matched the highest load I
have
out in the field (80w). It took 2 Tranzeo APs, an Xpeed SDSL modem,
and
a
19" TV on the QVC to load it up properly. Now instead of 1 hour I get
13
hours. Bigger, better batteries should net me more time than this.
My
goal
is bang for buck at this stage in my business...more run time for a
sensible
price.
One cool thing about this setup is that I can rig it up to be able to
simply
take new batteries out to a site when they are getting low, instead of
the
generator. I can keep some spare batteries charged up and ready to
go.
It's a whole lot cheaper and easier than purchasing multiple QUALITY
1000w
generators and putting large custom tanks on them. That is if your
UPS
is
not on the top of a water tower or something. ;)
Mark Nash
Network Engineer
UnwiredOnline.Net
350 Holly Street
Junction City, OR 97448
http://www.uwol.net
541-998-5555
541-998-5599 fax
----- Original Message -----
From: "Brian Rohrbacher" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Wednesday, November 15, 2006 6:41 PM
Subject: Re: [WISPA] External battery on UPS
I'm pasting Gino's link to the right thread.
Then I can search me email in a year and find the correct thread....
Connectors:
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=263-110
Batteries:
http://www.donrowe.com/batteries/8a31dt.html
Brian Rohrbacher wrote:
Can we get some links to these batteries that work well?
Gino,
Got a link to the DC block connectors you were talking about?
Brian
Travis Johnson wrote:
Hi,
We run two 4 gauge power wires out the front of the case, connect
the
positive to a 60A fuse, and then to the batteries.
We are using AGM type (same thing used in UPS systems) big
batteries
(a little bigger than a car battery, but each battery is 110
pounds).
We wire them in series (to get 24VDC).
This setup has only been installed for 12-18 months at various
locations, so I don't have an estimate on battery life.
Travis
Microserv
Brian Rohrbacher wrote:
You got any pics of this or similar Travis....anyone?
Travis,
What APC do you use and what batteries are added? What do you
draw
and what is th run time? Do you know how many times the one with
the most cycles has been drawn down? How long do the batteries
last?
Brian
Travis Johnson wrote:
You can't use just 1 battery. The APC units want to see 24vdc, so
you need two batteries running in series.
It works perfectly, as I have 20+ remote locations running off
two
gel type batteries. Make sure you install some type of a fuse on
the positive side of the connection.
Travis
Microserv
Mark Nash - Lists wrote:
I believe I remember some discussion on this list on connecting
an
external battery to an APC UPS. I'm in the middle of doing it
right now and am having problems. The UPS just beep
continuously
with the 'bad battery' light on. I'm using a Lifeline deep
cycle
battery. Any ideas?
Mark Nash
Network Engineer
UnwiredOnline.Net
350 Holly Street
Junction City, OR 97448
http://www.uwol.net
541-998-5555
541-998-5599 fax
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