Aaron, there may or may not be an explanation for WHY this happened. We
really love it when there is one though.
But being electronics and especially power electronics, it can go up
without rhyme or reason even though lots have
gone into catching failures before shipping units. Four to eight hours
of burn in is done on every charger...
This involves heating/cooling at regular intervals to get things to
fail. But sometimes it just happens.
Even cosmic rays can be the culprit if they happen to go through just
the right place on a silicon die
in the power stage transistors. Hard to catch one of those. Lightning
of course and its HV electric
fields nearby are also possible. Then again it could be a bad solder
joint or component. i.e Workmanship.
In that regard, just shipping a unit can jar something loose. We
(Midnite) do a physical
slight shock test on every unit as well but, sometimes UPS and their
gentle shipping
methods can shake something loose that should not have moved around.
Power products are very difficult to do for all the companies. Hopefully
we can get
even better at catching failures at the factory before they get out.
There is some of this
production and testing methods on a video on our web site that might
give you an
idea of how we make these. Front page, upper left corner as I remember.
Factory tour
or similar.
boB
On 5/30/2016 7:59 PM, Aaron Mandelkorn wrote:
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.
Aaron Mandelkorn
Owner/Solar Specialist
Renewable Energy Outfitters
www.reosolar.com <http://www.reosolar.com>
www.offgriddepot.biz <http://www.offgriddepot.biz>
970-596-3744
719-221-5249
reoso...@gmail.com <mailto:reoso...@gmail.com>
On May 30, 2016 8:43 PM, "Dan Fink" <danbo...@gmail.com
<mailto:danbo...@gmail.com>> wrote:
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.
Dan Fink
Adjunct Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342 <tel:970.672.4342>
On Mon, May 30, 2016 at 5:59 PM, Aaron Mandelkorn
<reoso...@gmail.com <mailto:reoso...@gmail.com>> wrote:
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.
Thanks
Aaron Mandelkorn
Owner/Solar Specialist
Renewable Energy Outfitters
www.reosolar.com <http://www.reosolar.com>
www.offgriddepot.biz <http://www.offgriddepot.biz>
970-596-3744 <tel:970-596-3744>
719-221-5249 <tel:719-221-5249>
reoso...@gmail.com <mailto:reoso...@gmail.com>
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