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<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>Kent
– <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>Is
your solar vent fan rated for the potential of explosive gasses and will the solar
fan be working at full charge when the backup generator is running [if you have
one]? <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'>I
have used 2 of the Zephyr fans on 2,000 ahr at 48 VDC battery banks and they
are rated for the gasses, and gotten great results.<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Dana
Orzel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>Great
Solar Works, Inc<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>www.solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>E
- dana@solarwork.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>V
- 970.626.5253<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>F
- 970.626.4140<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:#1F497D'>C
- 970.209.4076<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN style='font-family:"Arial","sans-serif";color:#1F497D'>“I'd put
my money on solar energy… I hope we don't have to wait 'til oil and coal
run out before we tackle that.”<o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
lang=EN style='font-family:"Arial","sans-serif";color:#1F497D'>—Thomas
Edison, in conversation with Henry Ford and Harvey Firestone, March 1931</span><span
style='font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:windowtext'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Kent
Osterberg<br>
<b>Sent:</b> Wednesday, April 08, 2009 1:59 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Solar vent for flat roof<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>Allan,<br>
<br>
I recently studied this battery room venting issue when an inspector challenged
me to show that a Zephyr vent was adequate to vent a room with a 48-volt
1700-amphour battery bank. I ended up finding that to keep the
hydrogen concentration down to 1% (1/4 the explosive limit) required 75
CFM. The Zephyr vent at 5 CFM wasn't anywhere near sufficient; we ended
up putting in a 100 CFM vent fan that is activated when the battery voltage
exceeds 2.4 volts/cell.<br>
<br>
Using a solar vent fan is probably a good solution as long as the only charging
source is solar. If there are any other charging sources, a solar vent
fan wouldn't be adequate. <br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
<br>
Allan Sindelar wrote: <o:p></o:p></p>
<pre style='margin-left:.5in'>We have twice used pairs of Zephyr Power Vents to successfully vent large<o:p></o:p></pre><pre
style='margin-left:.5in'>banks, up to around 2200A/hr @48V. A 12V unit exits roof or wall with a 2"<o:p></o:p></pre><pre
style='margin-left:.5in'>pvc stack; 48V is 3"; thus they flash just like standard plumbing vents.<o:p></o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'>Note that the charge rate is more important than battery capacity, as it<o:p></o:p></pre><pre
style='margin-left:.5in'>determines the amount of gassing that must be exhausted.<o:p></o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'>Allan at Positive Energy<o:p></o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'>-----Original Message-----<o:p></o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'>Wrenches,<o:p></o:p></pre><pre
style='margin-left:.5in'>Our client has 48 IBE 85N-15 batteries in a room with a flat roof. What is <o:p></o:p></pre><pre
style='margin-left:.5in'>your recommendation for a solar powered vent that works well and flashes <o:p></o:p></pre><pre
style='margin-left:.5in'>well so that it does not leak? Thanks in advance for your advice.<o:p></o:p></pre><pre
style='margin-left:.5in'>Joel Davidson <o:p></o:p></pre><pre style='margin-left:
.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'>_______________________________________________<o:p></o:p></pre><pre
style='margin-left:.5in'>List sponsored by Home Power magazine<o:p></o:p></pre><pre
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style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in;
text-align:center'>
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