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<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff size=2>Hi
William, </FONT></SPAN></DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff size=2>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 class=210174121-04042014><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff
size=2>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 class=210174121-04042014><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff size=2><A
href="http://www.bdbatteries.com/hydrogenventing.php">http://www.bdbatteries.com/hydrogenventing.php</A></FONT></SPAN></DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff size=2>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 class=210174121-04042014><FONT face=Arial color=#0000ff size=2>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 class=210174121-04042014><FONT face=Arial color=#0000ff size=2><IMG
src="cid:210174121@04042014-3108"></FONT></SPAN></DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210174121-04042014><FONT face=Arial color=#0000ff size=2><IMG
src="cid:210174121@04042014-310f"></DIV></FONT></SPAN>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org]<B>On Behalf Of
</B>william@millersolar.com<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 class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">Friends:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></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.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></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? <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></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.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">Thanks in advance
for the forthcoming, always expert advice.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'">William
Miller<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P></DIV></BLOCKQUOTE></BODY></HTML>