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<p>Aaron, there may or may not be an explanation for WHY this
happened. We really love it when there is one though.</p>
<p>But being electronics and especially power electronics, it can go
up without rhyme or reason even though lots have</p>
<p>gone into catching failures before shipping units. Four to eight
hours of burn in is done on every charger...</p>
<p>This involves heating/cooling at regular intervals to get things
to fail. But sometimes it just happens.</p>
<p>Even cosmic rays can be the culprit if they happen to go through
just the right place on a silicon die</p>
<p>in the power stage transistors. Hard to catch one of those.
Lightning of course and its HV electric</p>
<p>fields nearby are also possible. Then again it could be a bad
solder joint or component. i.e Workmanship.<br>
</p>
In that regard, just shipping a unit can jar something loose. We
(Midnite) do a physical<br>
<br>
slight shock test on every unit as well but, sometimes UPS and their
gentle shipping<br>
<br>
methods can shake something loose that should not have moved around.<br>
<br>
Power products are very difficult to do for all the companies.
Hopefully we can get<br>
<br>
even better at catching failures at the factory before they get
out. There is some of this<br>
<br>
production and testing methods on a video on our web site that might
give you an<br>
<br>
idea of how we make these. Front page, upper left corner as I
remember. Factory tour<br>
or similar.<br>
<br>
boB<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/30/2016 7:59 PM, Aaron Mandelkorn
wrote:<br>
</div>
<blockquote
cite="mid:CALVx-tVH1_Lz_UrxK6vFE9oPd5j68yzq6LgYv+rg6ZuzYGfJ0g@mail.gmail.com"
type="cite">
<p dir="ltr">Thanks all for the replies. Battery voltage was 13v
on this 48 volt system. How they drained so low I just don't
know. Low batter cut off was set and there were no DC loads.
Not to sure what to make if this. Will be contacting midnite
tomorrow.</p>
<p dir="ltr">Aaron Mandelkorn<br>
Owner/Solar Specialist<br>
Renewable Energy Outfitters<br>
<a moz-do-not-send="true" href="http://www.reosolar.com">www.reosolar.com</a><br>
<a moz-do-not-send="true" href="http://www.offgriddepot.biz">www.offgriddepot.biz</a><br>
970-596-3744<br>
719-221-5249<br>
<a moz-do-not-send="true" href="mailto:reosolar@gmail.com">reosolar@gmail.com</a></p>
<p dir="ltr"> </p>
<div class="gmail_quote">On May 30, 2016 8:43 PM, "Dan Fink" <<a
moz-do-not-send="true" href="mailto:danbob88@gmail.com"><a class="moz-txt-link-abbreviated" href="mailto:danbob88@gmail.com">danbob88@gmail.com</a></a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">MPPT does need a minimum battery voltage to
wake up and start charging, at least 9 volts -- I once
arrived at a remote site on a sunny day, the PV input
breaker had tripped, batteries were under 9v, no charging
despite the sunny weather until I woke the MPPT up with
jumper cables from my truck battery. </div>
<div class="gmail_extra"><br clear="all">
<div>
<div data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div><span
style="font-size:12.8000001907349px">Dan
Fink</span>
<div
style="font-size:12.8000001907349px">Adjunct
Professor of Solar Energy Technology,
Ecotech Institute</div>
<div
style="font-size:12.8000001907349px">IREC
Certified Instructor™ for: </div>
<div
style="font-size:12.8000001907349px">~
PV Installation Professional</div>
<div
style="font-size:12.8000001907349px">~
Small Wind Installer</div>
<div
style="font-size:12.8000001907349px">Executive
Director, Buckville Energy</div>
<div
style="font-size:12.8000001907349px">NABCEP
Registered Continuing Education
Providers™<br>
<a moz-do-not-send="true"
href="tel:970.672.4342"
value="+19706724342"
style="color:rgb(17,85,204)"
target="_blank">970.672.4342</a></div>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<div class="gmail_quote">On Mon, May 30, 2016 at 5:59 PM,
Aaron Mandelkorn <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:reosolar@gmail.com" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:reosolar@gmail.com">reosolar@gmail.com</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<p dir="ltr">Hi all. I returned to a off grid site today
after having no winter access. It appears as though
the classic 150 charge controller has failed. The
batteries are completely discharged. The classics
screen will flash occasionally as well as a yellow
light on this left front of the controller but wont
turn on. Does the classic have a minimum voltage
requirement needed to turn on? Has anyone else
experienced this? I can't figure out what happened to
cause this issue. </p>
<p dir="ltr">Thanks </p>
<span><font color="#888888">
<p dir="ltr">Aaron Mandelkorn<br>
Owner/Solar Specialist<br>
Renewable Energy Outfitters<br>
<a moz-do-not-send="true"
href="http://www.reosolar.com" target="_blank">www.reosolar.com</a><br>
<a moz-do-not-send="true"
href="http://www.offgriddepot.biz"
target="_blank">www.offgriddepot.biz</a><br>
<a moz-do-not-send="true" href="tel:970-596-3744"
value="+19705963744" target="_blank">970-596-3744</a><br>
<a moz-do-not-send="true" href="tel:719-221-5249"
value="+17192215249" target="_blank">719-221-5249</a><br>
<a moz-do-not-send="true"
href="mailto:reosolar@gmail.com" target="_blank">reosolar@gmail.com</a></p>
<p dir="ltr"> </p>
</font></span><br>
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