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<div class="moz-cite-prefix">I'm definitely interested in being
involved too. I really respect how difficult the language
crafting can be, and the frustration to have certain intent be
misconstrued by an AHJ some where else later. <br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 1/23/2014 4:17 PM, Dan Fink wrote:<br>
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<blockquote
cite="mid:CAF+3LnfG70f34GOMZhc54ukZ_USY8V8xhFnxbYi9tjakXR8HEg@mail.gmail.com"
type="cite">
<div dir="ltr">Thanks for the correction on that sedona fire Bill;
I had only seen the incorrect fire dept report.
<div>I wish there was a clearinghouse for information on RE
incidents and close calls as they are all teachable moments
for both RE professionals and firefighters.</div>
<div><br>
</div>
<div>I ditto the need for more NEC guidance on battery banks. In
my firefighting career, I've been at about a dozen structure
fires involving RE equipment. Only 4 were actually caused by
the RE equipment. *All* of those originated in or near the
battery bank. 1 internal battery short circuit, 1 mouse chew
inside battery box, and 2 bad connection when charging with a
generator.</div>
<div><br>
</div>
<div>I'd like to get involved, Bill....I have lots to say about
wooden battery boxes, parallel fusing, signage, and more. What
are the first steps for getting involved?</div>
<div><br>
</div>
<div>
<div class="gmail_extra">
<br clear="all">
<div>Dan Fink,<br>
Executive Director;<br>
Otherpower<br>
Buckville Energy Consulting<br>
Buckville Publications LLC<br>
NABCEP / IREC accredited Continuing Education Providers<br>
970.672.4342<br>
<br>
</div>
<br>
<br>
<div class="gmail_quote">On Thu, Jan 23, 2014 at 12:23 PM,
Bill Brooks <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:billbrooks7@yahoo.com" target="_blank">billbrooks7@yahoo.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Jeffrey
and Ray,</span></p>
<p class="MsoNormal">
<span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Batteries
can off-gas hydrogen-sulfide gas when under heavy
charge or overcharge. It is the nasty rotten egg
smelling gas. Definitely not to be inhaled since
when it hits your lungs it turns back into
sulfuric acid.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">To
address Ray’s point, the new 690.12 regulation
that has been getting a lot of air time on this
list does, in fact, address battery circuits for
PV systems. Any circuit that is part of a PV
system inside a building within 5’ must be
controlled to 30V, 240VA within 10 seconds. This
includes all the ac output conductors from a
backup PV inverter and the battery inverter input
circuit as well. This provision matches the new
requirement for battery systems in 690.71(H) that
requires “A disconnecting means and overcurrent
protection shall be provided at the energy storage
device end of the circuit. Fused disconnecting
means or circuit breakers shall be permitted to be
used.” Ideally we try to keep our battery
conductors to 5’ or less and that means that no
additional disconnecting means would be necessary
according to the new 690.71(H). If we have to go
longer than 5’ and the conductors are inside the
building, a rapid shutdown capability would need
to be on that circuit and it would need to have a
disconnecting means and overcurrent protection.
The best way to meet this requirement would
probably be to have a shunt-trip breaker, similar
to what Midnite Solar provides with their
birdhouse setup.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">There
are definitely much more discussion going on in
the NEC about energy storage now than ever before.
This next code cycle will be very busy on the
subject. It is likely that article 480 will soon
be turned into “Energy Storage” or a new article
in Chapter 6 or 7 will cover “Energy Storage
Systems.” It was proposed last cycle and failed,
but this time there is much more interest in the
subject. The solar industry needs to be involved,
so it sounds like this is your year for both of
you to get involved.</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Bill.</span></p>
<p class="MsoNormal"><br>
</p>
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