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Jeffrey,<br>
<br>
I'll second Jay's suggestion that sealed AGM batteries are the best
choice in this circumstance. Presumably this is a grid backup system
so the poor endurance of AGMs for cycling applications shouldn't be
an issue. If you use a Zephyr power vent horizontal runs shouldn't
be problem, but what happens when the power vent fails? It will
fail. I've seen the bearings wear out on one and another that failed
when insects got into the blades and gummed it up to the point that
the motor stalled.<br>
<pre class="moz-signature" cols="72">Kent Osterberg
Blue Mountain Solar, Inc.
<a class="moz-txt-link-abbreviated" href="http://www.bluemountainsolar.com">www.bluemountainsolar.com</a>
t: 541-568-4882</pre>
<br>
On 12/31/2011 6:59 AM, JRQ wrote:
<blockquote
cite="mid:1325343579.70837.YahooMailNeo@web39304.mail.mud.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; ">Wrenches,</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; "><br>
</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; ">I'm looking at a potential battery
backup system wtih a 200 AH @48V flooded battery bank in
the basement electrical room of a 3 story building. There
is a window in the electrical room. The batteries will be
located about 10' from an outdoor wall. The building is
all reinforced concrete, so I can not run a vent pipe
vertically from the batteries. Does anyone have a rule of
thumb for how much the vent pipes can be angled from the
batteries? Would it be more lenient for short sections of
pipe (say <2') versus one long angled piece from the
batteries? My instinct would be to keep the pipe no more
than 45˚ from plumb.</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; "><br>
</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; ">Or with bending the vent pipe: does
anyone have a best-practice rule for the sum of the angles
of bends?</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; "><br>
</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; ">Thanks,</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; ">Jeffrey Quackenbush</span></span></div>
<div><span><span class="Apple-style-span" style="color: rgb(69,
69, 69); font-family: Arial, Helvetica, sans-serif;
font-size: 12px; ">NABCEP Certified PV Installer</span></span></div>
<div style="font-size: 12pt; font-family: 'times new roman',
'new york', times, serif; "><span><span
class="Apple-style-span" style="color: rgb(69, 69, 69);
font-family: Arial, Helvetica, sans-serif; font-size:
12px; ">Peripatetic Solar Technician</span></span><font
face="Arial" size="2">
<hr size="1"></font><a moz-do-not-send="true"
ymailto="mailto:RE-wrenches@lists.re-wrenches.org"
href="mailto:RE-wrenches@lists.re-wrenches.org"></a>
</div>
<div style="font-size: 12pt; font-family: 'times new roman',
'new york', times, serif; "> </div>
</div>
</blockquote>
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