<p dir="ltr">If you do decide to vent the battery box, The battery enclosure should be air tight, in the event the wind is blowing higher air pressure could exist outside and push any gases into the building. I understand that this is a sealed battery buy they will fail and if it was me I would want then in a sealed cabinet vented or not. I have had battery failures and its not pretty<br>
Jerry</p>
<div class="gmail_quote">On Jun 21, 2014 12:30 PM, "Bob Clark" <<a href="mailto:bclark@solar-wind.us">bclark@solar-wind.us</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">RE-Wrenches:<div><br></div><div>2014 NEC 480.9 (A) has two informational notes that seem to point to the possibility of not having to vent AGMs.</div><div><br></div><div>Here is what I was going to do with 8 Concorde SunXtender Batteries, 6V, 405Ah, L16, PVX-4050HT:</div>
<div><br></div><div>1. Put them in a Midnite Solar, MNBE-CL16 Battery Enclosure (which is not a sealed box) in a “battery closet."</div><div>2. Vent the box out of the top of the box and through the wall of the house with pipes like Kevin Pegg suggests.</div>
<div><br></div><div>Do any of you see any problems with this? Venting unnecessary?</div><div><br></div><div>One consideration is the “next guy” who occupies this house may want flooded batteries, in which case, the vent system would definitely be necessary.</div>
<div><br><div>
<div>Bob Clark</div><div><a href="mailto:bclark@solar-wind.us" target="_blank">bclark@solar-wind.us</a></div><div><br></div><br>
</div>
<br><div><div>On Apr 4, 2014, at 2:49 PM, Kevin Pegg <<a href="mailto:kpegg@energyalternatives.ca" target="_blank">kpegg@energyalternatives.ca</a>> wrote:</div><br><blockquote type="cite">
<div lang="EN-US" vlink="purple" link="blue">
<div><span><font face="Arial" color="#0000ff">Hi
William, </font></span></div>
<div><span><font face="Arial" color="#0000ff"></font></span> </div>
<div><span><font face="Arial" color="#0000ff">In the
cold north here in Canada, this is the most common way we install batteries -
within the heated envelope of a home or shop, installed in a sealed &
vented battery enclosure. </font></span></div>
<div><span><font face="Arial" color="#0000ff"></font></span> </div>
<div><span><font face="Arial" color="#0000ff">Hydrogen is easy to vent as it is lighter than air. We use a process
similar to below. I see a lot of installations with power vents that are not
done properly - exhaust only but no intake as example. They can also fail. Or
installed in such a way that outside wind influences could actually reverse the
flow and pressurize the battery box! Air flow needs to be balanced.
</font></span></div>
<div><span><font face="Arial" color="#0000ff"></font></span> </div>
<div><span><font face="Arial" color="#0000ff"><a href="http://www.bdbatteries.com/hydrogenventing.php" target="_blank">http://www.bdbatteries.com/hydrogenventing.php</a></font></span></div>
<div><span><font face="Arial" color="#0000ff">To
remove the thermal air currents present in a battery box venting system, you
must create a natural heat sink between the vent tubes to neutralize the
difference in temperature. This in turn will stagnate the air, allowing the
hydrogen which is lighter than air, to rise and escape the battery box. Make
sure the smaller tube, the one inside, extends to the bottom of the box. This
will allow "heavier" fresh air to fall to the floor of the box and retard
hydrogen entry. The intake for the hydrogen is at the top of the box, the
exterior tube in the system. Hydrogen will travel in the opposite direction
through the larger outer pipe as it is lighter than the air surrounding it.
Several good methods for constructing this vent system exist, we particularly
like to see 1/2 inch copper pipes inside 1 inch pipe. Any highly conductive
metal pipe will work it will transfer heat quickly. Galvanized, steel, and other
pipes that spark when rubbed aren't as great. DO NOT USE THESE IN EARTHQUAKE
ZONES. </font></span></div>
<div> </div>
<div><span><font face="Arial" color="#0000ff">DO NOT
USE PVC FOR THIS VENT SYSTEM....PVC DOES NOT CONDUCT HEAT WELL ENOUGH! Copper,
aluminum, and other non sparking conductive metals are great!
<br></font></span></div>
<div><span><font face="Arial" color="#0000ff"><Outlook.bmp></font></span></div>
<div><span><font face="Arial" color="#0000ff"></font></span> </div>
<div><span><font face="Arial" color="#0000ff"><Outlook.bmp></font></span></div>
<blockquote dir="ltr" style="MARGIN-RIGHT:0px">
<div dir="ltr" align="left"><font face="Tahoma">-----Original Message-----<br><b>From:</b>
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]<b>On Behalf Of
</b><a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a><br><b>Sent:</b> April 4, 2014 9:29
AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] Batteries in a
dwelling<br><br></font></div>
<div><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'">Friends:<u></u><u></u></span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'"> </span></p>
<p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'">I am proposing
installation of vented batteries in a first floor garage of a dwelling.
The dwelling areas are on the second floor. I am nervous about the
cohabitation of batteries and humans.<u></u><u></u></span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'"> </span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'">I reviewed the NEC
and could not find any prohibition. Do any of you have any advice on how
this is accomplished in the mot safe manor? <u></u><u></u></span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'"> </span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'">I presume good
ventilation and an otherwise sealed room are advised. I will propose
additional smoke detectors, locked doors and I will research hydrogen
detectors. A good spill kit and all PPE will be staged as
usual.<u></u><u></u></span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'"> </span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'">Thanks in advance
for the forthcoming, always expert advice.<u></u><u></u></span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'"> </span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'">William
Miller<u></u><u></u></span></p><p class="MsoNormal"><span style="FONT-SIZE:12pt;FONT-FAMILY:'Arial','sans-serif'"> </span></p></div></blockquote></div>
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