Brian,

  I guess I am an idiot because I hadn't thought of that! I don't have any
(hardly) of my APC UPS's overloaded and it would probably be pretty easy to
do that. I bought some rack mount Compaq 3000Watt UPS's for the NOC and tied
4 Gel Cell 100lb batteries to each of those Compaq's. That has been working
like a charm, but it scares the fire out of me to mess around them. While
connecting them I managed to arc the wires and that produced a ball of fire
that was bigger than I was! I later found out those 4 12VDC batteries in a
series (48VDC) produces more than enough DC voltage to knock your guts out
while it blows the bottom of your feet off.

 Sorry for that story - but it may keep some of us from "leaving here early"

Mac 



-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Brian Webster
Sent: Sunday, July 09, 2006 10:00 PM
To: WISPA General List
Subject: RE: [WISPA] DC Inverter help

Mac,
        Can you tap in to the battery lines on the UPS and add extra
external
batteries to extend the run time? This would give you the advantage of
conditioned power and automatic switch over of the UPS, and you would still
have any other management features of the UPS still available to you. Just
an idea to consider.



Thank You,
Brian Webster

-----Original Message-----
From: Mac Dearman [mailto:[EMAIL PROTECTED]
Sent: Sunday, July 09, 2006 10:35 PM
To: 'WISPA General List'
Subject: RE: [WISPA] DC Inverter help



Can anyone give me a lead as to what I am looking for? I believe this
http://tinyurl.com/lje7s is what I need, but I don't think I need 400Watts
as all I will be pulling at several new tower sites are a few RB532's with
their radios. I think I ought to keep the RB532s powered at 48VDC as they
will be in excess of 200' up a tower. My intentions are to put a couple
Marine batteries in an enclosure for back up power and have the DC inverter
to keep them charged and have a seamless transfer if a power outage comes
along. I have been putting these big honking APC UPSs in all my enclosures,
but am trying to get something that will last longer in times of outages

Any help would surely be a appreciated.

Thanks folks,
Mac


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