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<div class="moz-cite-prefix">Bob,<br>
For what it's worth, my experience has been good. I have used
maybe 30-40 on various systems over the years and serviced a few
installed by homeowners and others. I have replaced perhaps half a
dozen of the fans. But that includes ones in which rain got in, or
a bird got in the stack, died and blocked the fan. Whoops - come
to think of it, that also includes Sun-Mar compost toilet exhaust
fans, which were seldom capped to keep birds out.<br>
<br>
The only moving part that could fail is the fan, and it's a
standard 3" muffin fan, made by the millions. The rest is pretty
much just PVC fittings. I'm not sure I'd necessarily trust Radio
Shack to supply a better fan.<br>
<br>
In Drake's case operational longevity would be less of an issue. A
fan that is there for safety, and seldom if ever runs, would be
unlikely to wear out.<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span
style="mso-bidi-font-weight:bold">Positive Energy,
Inc.</span><br>
<b>505 780-2738 cell</b><br
style="mso-special-character:line-break">
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<!--[endif]--><b><o:p></o:p></b></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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On 11/2/2014 4:14 PM, RE Ellison wrote:<br>
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<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial
Black","sans-serif";color:black">I have had
poor luck with the Zephyr fan lasting. Maybe the newer units
are improved.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial
Black","sans-serif";color:black">Years ago I
settled on a Radio Shack 3” fan that has given me good
lifetimes and draws under the relay limit in the
controllers. I usually mount it in a PVC 6 x 6 box as high
in the battery box as I can get it. Then run the 2” as high
as I can. If backdrafts are a worry (does not seem to be an
issue with a tall pipe) use a s+d flapper valve, mounted
vertically. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial
Black","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Arial
Black","sans-serif";color:black">Bob Ellison<o:p></o:p></span></p>
<div>
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
RE-wrenches
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Drake<br>
<b>Sent:</b> Sunday, November 02, 2014 12:08 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Battery Venting (WAS
Passive Battery Venting)<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Allan,<br>
<br>
That was my plan when he insisted on venting to the outside. <br>
<br>
I use the Zephyr Power Vent for liquid lead acid batteries.
When replaced the liquid electrolyte batteries in our backup
system with AGM, we turned off the Zephyr and took the door
off the battery box. I showed it to the client. I think when
you use the word hydrogen to many people they think of the
Hindenberg disaster. <br>
<br>
Has New Mexico ever come to conclusions concerning venting
sealed batteries to the outside, or is it still in limbo?<br>
<br>
Thanks,<br>
<br>
Drake<br>
<br>
<br>
<br>
At 11:39 AM 11/2/2014, you wrote:<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Drake,<br>
My suggestion is that to achieve the client's wishes as well
as your own cooling concerns, you include a Zephyr Power Vent
in a 2" PVC vent stack to the outside. Let the charge
controller's voltage-actuated auxiliary setting power the vent
(it's OK to do so directly on Outback and Midnite controllers,
and I believe all other major ones as well). As these are
sealed batteries,they won't gas significantly under normal
charge voltages. Set the turn-on voltage at the gassing
voltage, or thereabouts depending on your determination. This
will be above (or below but near) normal charge voltage, and
will cause the Power Vent to turn on only under abnormal
conditions. The Power Vent also has a backdraft damper built
in (which is why it must be oriented vertically) so will
prevent excessive convective heat loss when not running.<br>
<br>
This won't address the possibility of one cell failing and
gassing, as the string voltage determines turn-on. However, as
others have pointed out, that may be of benefit: if one cell
fails you'll still be able to smell it and address the
problem.<br>
Allan<br>
<br>
<b>Allan Sindelar</b><br>
<a moz-do-not-send="true"
href="mailto:allan@sindelarsolar.com">allan@sindelarsolar.com</a><br>
NABCEP Certified PV Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), Positive Energy, Inc.<br>
<b>505 780-2738 cell</b><br>
<br>
<br>
On 10/29/2014 6:19 PM, Drake wrote:<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Hi Daniel, <br>
<br>
I typically vent them the way you do, which will allow any
small amount of hydrogen out. The customer is absolutely
adamant about venting these to the outside. I will cooperate
so long as his method doesn't compromise the system through
cooling the batteries unnecessarily in the dead of winter. <br>
<br>
He is a lawyer and came to the conclusion of the need for
venting to the outside from reading the NEC which says that
sealed batteries "require the same amount of ventilation" as
liquid lead acid batteries. The code also says to vent
appropriate to battery technology, so the code says two
conflicting things. On the other hand, it doesn't say that
liquid electrolyte batteries need to be vented to the outside.
They will sure stink if you vent them to the inside. <br>
<br>
Drake <br>
<br>
At 09:54 AM 10/29/2014, you wrote: <br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">I just re-read the original post Drake.
These are AGM batteries. Do you have <br>
a "belt, suspenders,...then a rocket pack" type of client
here? <br>
<br>
We typically vent our AGM boxes with small louver vents top
and bottom to <br>
allow the batteries to ventilate for cooling purposes, not H2
concerns. <br>
<br>
With Regards, <br>
<br>
Daniel Young, <br>
NABCEP Certified PV Installation ProfessionalTM: Cert
#031508-90 <br>
NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13
<br>
<br>
-----Original Message----- <br>
From: RE-wrenches [<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] On <br>
Behalf Of Ray Walters <br>
Sent: Tuesday, October 28, 2014 11:12 PM <br>
To: RE-wrenches <br>
Subject: Re: [RE-wrenches] Passive Battery Venting <br>
<br>
That's why we usually have the batteries in a garage,
basement, or out <br>
building that is not open to the living space. <br>
I've seen some cases of very well sealed and insulated
enclosures allowing <br>
batteries to over heat, and also build up a lot of acid
damaged connections. <br>
Boxes I've seen with more air space and less sealing don't get
this build <br>
up, but you're correct: they do occasionally allow H2S into
the surrounding <br>
area. <br>
<br>
R.Ray Walters <br>
CTO, Solarray, Inc <br>
Nabcep Certified PV Installer, <br>
Licensed Master Electrician <br>
Solar Design Engineer <br>
303 505-8760 <br>
<br>
On 10/28/2014 8:10 PM, Jerry Shafer wrote: <br>
> <br>
> We do what we can to seal the enclosure so if or when a
battery fails <br>
> and really gasses off the two vents on the same wall
regardless of <br>
> wind direction will vent the gas. If it is not sealed
then the gas can <br>
> travel through out the area this is not advised. <br>
> <br>
> <br>
<br>
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