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Hi Bill;<br>
<br>
If the battery is in an insulated box indoors, it definitely can
over heat. Also if ambient temps get into the 90s, the additional
heat from charging can push the battery into the danger zone. In
hot desert or tropical climates, it may actually be difficult to
keep the battery below 105F. <br>
I'm very glad to hear Midnite added the high temp disconnect to
their system. They may have saved a life.<br>
Bob, is battery temp logged, so we could see how often a system
quits charging for high temp, and just what the battery temps are
running? Many of our systems may need additional cooling. A recent
HUP install in Haiti comes to mind.....<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>
<div class="moz-cite-prefix">On 5/22/2015 8:28 AM, frenergy wrote:<br>
</div>
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<div>Hey Jay,</div>
<div> </div>
<div> From what I've heard form battery manus, the C rates
likely even in a well PV-ed system still will not produce
C-rates high enough to approach a high or "longevity reducing"
internal battery temp, assuming a typical bulk, absorb, float
cycle. Of course, battery environmental location (typical
temps) would set a baseline from which batt temp would rise
from. Here in the Sierra, ambients are not very high 95% of the
time.</div>
<div> </div>
<div> Just curious, how does the wiz bang account for all
loads...2 shunts?</div>
<div> </div>
<div>Thanks,</div>
<div> </div>
<div>Bill</div>
<div>Feather River Solar Electric</div>
<blockquote style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px;
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<div style="FONT: 10pt arial">----- Original Message ----- </div>
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color:
black"><b>From:</b> <a moz-do-not-send="true"
title="jay.peltz@gmail.com"
href="mailto:jay.peltz@gmail.com">jay peltz</a> </div>
<div style="FONT: 10pt arial"><b>To:</b> <a
moz-do-not-send="true"
title="re-wrenches@lists.re-wrenches.org"
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</a>
</div>
<div style="FONT: 10pt arial"><b>Sent:</b> Thursday, May 21,
2015 8:07 PM</div>
<div style="FONT: 10pt arial"><b>Subject:</b> Re: [RE-wrenches]
FLA battery setpoints with larger arrays</div>
<div><br>
</div>
<div dir="ltr">Hi Allan,
<div><br>
</div>
<div>I like the classic/wiz bang jr. This allows really good
end amp control as all loads are accounted for.</div>
<div><br>
</div>
<div>Higher C rates equal higher internal temps which
definitely will shorten the life.<br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, May 21, 2015 at 10:56 AM,
Allan Sindelar <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:allan@sindelarsolar.com"
target="_blank">allan@sindelarsolar.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT:
1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px
solid">
<div style="COLOR: rgb(0,0,0); BACKGROUND-COLOR:
rgb(255,255,255)" text="#000000" bgcolor="#FFFFFF">Wrenches,<br>
In the last few years I have changed my approach to
off grid system sizing, primarily due to higher
battery costs and lower module costs. Rather than
shooting for a traditional 80-90% of winter load
profile target, I will size a larger array and
smaller battery bank, figuring (especially here in
the sunny Southwest) that batteries will recharge
more quickly, will spend more of their time full
(and thus last longer), and will be at least
partially charged during cloudy weather. This even
allows for smaller battery banks that are cycled
more deeply (as long as there's a backup gennie in
the mix); the lower cost of a smaller size may allow
for a set of higher-quality industrial cells.<br>
<br>
I first began to rethink my design approach after
reading Christopher Freitas' Solar Pro article on
large battery banks a few years ago. Being able to
refill in a day was part of his strategic approach
to battery bank design. I used and wrote about this
approach in my tiny house article in the current
Home Power. However, I'm just beginning to get owner
feedback about greater water consumption and the
need for more frequent watering. This is especially
the case when I add array to an existing system, and
the old watering schedule is suddenly not enough. <br>
<br>
When I design new systems I now encourage larger
arrays and smaller battery banks, as the batteries
spend more of their time happily full and recover
more quickly after a discharge period. But I am
thinking that I will have to begin changing charging
setpoints in response. Flooded batteries have a
range of recommended bulk setpoints, from 28.8 to
29.6 volts on a 24V system. When arrays were smaller
we set to the higher end of the range to take
advantage of topping off when available, and a two
hour or longer absorption was considered beneficial,
as long as the CC could transition to float at 2% of
capacity or so. With a larger array a better
approach may be to lower the bulk/absorption
setting, as well as reduce absorption time and raise
the float transition current ("done amps"). <br>
<br>
I'm writing to encourage a discussion among off grid
Wrenches. Are you changing the relative relationship
between array and battery capacities? If so, how are
you adjusting charge controller setpoint
programming? For example, how would you program a
Midnite Classic, Outback FM or Schneider XW if you
could achieve a C/10 or C/15 charge rate?<br>
<br>
Thanks, Allan<span class="HOEnZb"><font
color="#888888"><br>
<div>
<div>
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="FONT-SIZE: 10pt"><a
moz-do-not-send="true"
href="mailto:allan@sindelarsolar.com"
target="_blank">allan@sindelarsolar.com</a></span><br>
<span style="FONT-SIZE: 10pt">NABCEP
Certified PV Installation Professional<br>
NABCEP Certified Technical Sales
Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder (Retired), <span>Positive
Energy, Inc.</span><br>
<b><a moz-do-not-send="true"
href="tel:505%20780-2738"
target="_blank" value="+15057802738">505
780-2738</a> cell</b><br>
<br>
</span></p>
<p class="MsoNormal"><br>
</p>
</div>
</div>
</font></span></div>
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</div>
<div><br>
</div>
-- <br>
<div class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>Jay Peltz<br>
Peltz Power<br>
<a moz-do-not-send="true"
href="mailto:jay.peltz@gmail.com"
target="_blank">jay.peltz@gmail.com</a></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p> </p>
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