<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
On 3/4/09 2:16 PM, Jeff Blick wrote:
<blockquote cite="mid:20090304221642.25651FE9E@che.dreamhost.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="Generator" content="Microsoft Word 11 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Arial;
color:windowtext;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
</style>
<div class="Section1">
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I am
wondering if any of you are familiar with a relay that will operate as
a low
voltage disconnect/reconnect. We are using stacks of three xantrex xw
inverter/chargers for each back up battery bank. Do any wrenches know
of
a relay that would work for this configuration (48 volt battery bank)?</span></font><br>
</p>
</div>
</blockquote>
<br>
These are quite common in telecom, often as part of an assembly
referred to in the trade as a BDFB (Battery Distribution Fuse Bay) or
BDCBB (Battery Distribution Circuit Breaker Bay.) Telco standards and
practices represent the distillation of a hundred years' realworld
experience with DC power – I tend to trust them when it comes to 48V
distribution equipment.<br>
<br>
Off the shelf LVD modules come in sizes up to 600A or so from most
major telecom power manufacturers. Systems rated for 4,000A or more
are not uncommon.<br>
<br>
There is a lot of *beautifully* engineered DC power distribution gear
out there in the secondary market - a surprising amount of it unused.
Some of it shows up on eBay, but there is a lot more hiding in
warehouses collecting dust. Contact me off-list and I can put you in
touch with a couple of telecom hardware resellers who may be able to
help.<br>
<br>
<br>
<br>
<br>
<br>
</body>
</html>