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<DIV><FONT size=2 face=Calibri>Yes, that is one I had forgotten about. The
100/20 and 100/30 have a max Voc of 95 volts so it should have no problem
with those panels.</FONT></DIV>
<DIV><FONT size=2 face=Calibri></FONT> </DIV>
<DIV>..................................................................................................<BR>Northern
Arizona Wind & Sun - Electricity From The Sun Since 1979<BR>Solar Discussion
Forum: <A
href="http://www.wind-sun.com/ForumVB/">http://www.wind-sun.com/ForumVB/</A><BR>..................................................................................................</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=mick@abrahamsolar.com href="mailto:mick@abrahamsolar.com">Mick
Abraham</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
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> Tuesday, June 30, 2009 7:28
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] Solar Boost
Controller in Senegal</DIV>
<DIV><BR></DIV>Chiming in with another suggestion for an alternate charge
control, I would look closely at Phocos. I've sold several of their early
generation MPPT controllers and none of them have broken so far...even though
some went to hot climates. The new version has firmware upgrade capabilities
if you get the right accessories. <BR><BR>The Phocos enclosure is about as
wide as a SolarBoost50, but not as tall. It is more deep front to back,
IIRC.<BR><BR clear=all>Mick Abraham, Proprietor<BR><A
href="http://www.abrahamsolar.com">www.abrahamsolar.com</A><BR><BR>Voice:
970-731-4675<BR><BR><BR>
<DIV class=gmail_quote>On Tue, Jun 30, 2009 at 8:13 AM, Bob-O Schultze <SPAN
dir=ltr><<A
href="mailto:bob-o@electronconnection.com">bob-o@electronconnection.com</A>></SPAN>
wrote:<BR>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0pt 0pt 0pt 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote>
<DIV>alt,
<DIV>In addition to those possible replacement controllers you mentioned,
you might add the BZ MPPT 500 to the list. I've had a few issues with them
but that seems to have mostly sorted itself out. Very reasonably priced for
a MPPT controller, 100 Voc input. The catch is you've got a 500W output
limit.</DIV>
<DIV>Bob-O</DIV>
<DIV><BR>
<DIV>
<DIV>On Jun 30, 2009, at 1:26 AM, Walt Ratterman wrote:</DIV><BR><SPAN
style="TEXT-TRANSFORM: none; TEXT-INDENT: 0px; BORDER-COLLAPSE: separate; FONT: medium Helvetica; WHITE-SPACE: normal; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px">
<DIV lang=EN-US vlink="purple" link="blue">
<DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Hello all,</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Thanks to all of your responses, and
particularly Rick’s confirmation of the appropriate ranges for the SB50, it
has become clear that these panels can not be made to work with the SB50,
and that the SB50 was the wrong choice for these pre-fabricated systems, or
perhaps better phrased, the panels were the wrong choice for the
controller. Actually, it is probably more accurate that the panels
were the wrong choice because their characteristics severely limit the
possible options of what to do next.</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">I would like your input on what you think
should be done here.</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Nine systems were purchased from
Earthwalk. One has been deployed for four months. A second unit
is being deployed now. This leaves seven in the warehouse. (And
we wont even get into the fact that we have AGM batteries here instead of
the advertised GEL batteries, and the voltage is so low they might not even
work……I will deal with that separately…..)</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">While it is clear that the panels do not match
up with the controller, it is not clear why they are still working (other
than the heat and dirt) and if they will continue to
work. </SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">One solution would be to just leave everything
alone and tell them what they should do if the system(s) fail. In some
cases, this might be the right action to take. But in this case, I
think the folks who sold the prefabricated unit should be held accountable,
and provide a system that is designed to work properly. The schools
paid good money for this equipment and they should at least have a running
start at success, which is difficult to come by in this part of the world on
a good day.</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">So – when we tell the schools to insist that
the system be fixed, what do you think we should tell them?</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Due to the characteristics of the panel (not
being either 12V or 24V nominal) they need a MPPT controller. I
suppose we could tell them to change to a controller that will accept the
output of the panel. This would be either Outback, Midnite Solar, or
possibly the new Morningstar 15A controller. Any
suggestions?</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">The other route would be to have them change
the panels, and keep the prefabricated system as it is. Rick:
what would you recommend the best voltage / current combination to replicate
the need for a 440 to 500 watt peak array output with the
SB50? </SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Given the relative cost of the panels versus
the controller, the manufacturer may likely decide to switch the
controllers, but it is not as easy as it sounds. If either the Outback
or Midnite controllers are used, they will not fit into the small space the
cabinet allowed for the SB50. But I will deal with that another
way. (We will just build an all new cabinet here in
Senegal).</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">So – any ideas or thoughts I have missed are
welcome!!</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Thanks so much for all of the great
feedback. I think, like most of us, every day is a learning
experience, even if we think we have done this 100 times
before. </SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Take care,</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)">Walt</SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="COLOR: rgb(31,73,125)"></SPAN> </DIV>
<DIV>
<DIV
style="BORDER-BOTTOM-STYLE: none; PADDING-BOTTOM: 0in; BORDER-RIGHT-STYLE: none; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-LEFT-STYLE: none; BORDER-TOP: rgb(181,196,223) 1pt solid; PADDING-TOP: 3pt">
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><B><SPAN
style="FONT-FAMILY: Tahoma,sans-serif; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: Tahoma,sans-serif; FONT-SIZE: 10pt"><SPAN> </SPAN>Rick
Cullen - Blue Sky Energy, Inc. [<A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:rick@blueskyenergyinc.com"
target=_blank>mailto:rick@blueskyenergyinc.com</A>]<SPAN> </SPAN><BR><B>Sent:</B><SPAN> </SPAN>Monday,
June 29, 2009 10:14 AM<BR><B>To:</B><SPAN> </SPAN><A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:wratterman@sunenergypower.com"
target=_blank>wratterman@sunenergypower.com</A>;
'RE-wrenches'<BR><B>Subject:</B><SPAN> </SPAN>RE: [RE-wrenches] Solar
Boost Controller in Senegal</SPAN></DIV></DIV></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">Hello
Everyone,</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">The SB50's maximum
input voltage spec it 57VDC. This should be considered an absolute maximum
above which the controller will be damaged in a manner not covered by
warranty. Our recommendation is to not apply a total Voc at STC of more
than 57V/1.25= 45.6V. There are transient voltage protection diodes on
both battery and PV inputs on ALL Solar Boost charge controllers.
These are not "tell tail" indicators but real protection devices
designed/selected to protect down stream electronics from transient voltage
damage resulting from ESD, lightning, etc. On the PV side of the SB50 the
protection diodes will begin to clip at about 58-60V. They can eat a 1
millisecond 3000W transient without damage, but will burn up if they receive
more than about 10W continuously. These two diodes are located right behind
the PV terminals.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">In the application
described below I would expect the SB50 to be damaged. What typically
happens with excess over voltage is the diodes fail short, and then
clamp PV voltage low and protect the down stream electronics. If PV current
is sufficiently high the diodes will burn open and the SB50 may
continue to operate since down stream devices have somewhat higher voltage
withstand capability, or it may suffer catastrophic damage.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">Why these systems
continue to operate must be due to actual Voc not getting high enough long
enough to cause catastrophic damage. If the controllers were to not
switch to Float (unloading the PV's), the brief Voc sample as part of MPPT
may not have burned up the diodes and they are successfully eating the
excess voltage transients which would seem to occur during the Voc
sample. It may also be that the modules are so hot that their
actual Voc & Vmp are low enough that when PV voltage is clamped to
60V by the SB50's protection diodes insufficient power is delivered at 60V
to burn up the diodes...</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">Needless to say, this
is a situation that need to be corrected. Technical Bulletin #100214
available on our web site describes proper voltage, current and power sizing
for all Solar Boost charge controllers.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">Regards,</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"><SPAN> </SPAN><BR></SPAN><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">Richard A.
Cullen</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"><SPAN> </SPAN><BR></SPAN><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">Blue Sky Energy,
Inc.</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"><SPAN> </SPAN><BR></SPAN><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">760-597-1642
x102</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"><SPAN> </SPAN><BR></SPAN><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">fax
760-597-1731</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"><SPAN> </SPAN><BR><A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:rick@blueskyenergyinc.com" target=_blank><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">rick@blueskyenergyinc.com</SPAN></A><SPAN> </SPAN><BR><A
style="COLOR: blue; TEXT-DECORATION: underline"
href="http://www.blueskyenergyinc.com/" target=_blank><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 10pt">www.blueskyenergyinc.com</SPAN></A><SPAN> </SPAN><BR></SPAN><SPAN
style="FONT-FAMILY: Arial,sans-serif; FONT-SIZE: 12pt"> </SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN> </DIV>
<DIV
style="TEXT-ALIGN: center; MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"
align=center><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt">
<HR align=center SIZE=2 width="100%">
</SPAN></DIV>
<P
style="MARGIN: 0in 0in 12pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"><B><SPAN
style="FONT-FAMILY: Tahoma,sans-serif; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: Tahoma,sans-serif; FONT-SIZE: 10pt"><SPAN> </SPAN><A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
target=_blank>re-wrenches-bounces@lists.re-wrenches.org</A><SPAN> </SPAN>[<A
style="COLOR: blue; TEXT-DECORATION: underline"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
target=_blank>mailto:re-wrenches-bounces@lists.re-wrenches.org</A>]<SPAN> </SPAN><B>On
Behalf Of<SPAN> </SPAN></B>Walt
Ratterman<BR><B>Sent:</B><SPAN> </SPAN>Friday, June 26, 2009 3:22
PM<BR><B>To:</B><SPAN> </SPAN>'RE-wrenches'<BR><B>Subject:</B><SPAN> </SPAN>[RE-wrenches]
Solar Boost Controller in Senegal</SPAN><SPAN
style="FONT-FAMILY: 'Times New Roman',serif; FONT-SIZE: 12pt"></SPAN></P>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">Hello,</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">I
am in a very remote part of Senegal, (near the Guinea and Mali
borders…) and I have come across some prefabricated “plug and play” American
made systems installed for educational institutions.</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">The
systems use two Sharp panels that are 220Watts, 33.6 Voc, 29.2 Vmp, wired in
series, using #10AWG home run wire from the panels back to the charge
controller.</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">Charge
Controller is a Solar Boost 50. </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">Batteries
are Dekka AGM – two strings of 250AH, 12V batteries. (four batteries
total).</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">My
specific question is about the controller. This is a 24V in / 24V out
charge controller with MPPT. I have not used this before, so I am not
familiar with the details of operation.</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">The
data sheet that I downloaded says that the maximum open circuit voltage is
57 VDC. But, this system is hitting the charge controller with two
panels of 33.6 VDC wired in series for 73.2VDC. So, why is the
controller not fried, or what am I seeing wrong here. I suppose with
the panel temperature being elevated maybe 35 degrees above 25 degrees and a
resulting 17.5% loss, coupled with some voltage drop, the system may
actually be seeing less than the 57 volts. </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">But…..isnt
this a dangerous way to design a system? (it will get cooler here
….)</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">Or
am I missing something?</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">What
would be the appropriate application here….</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt">Sorry,
I cant do a lot of internet research from here – limited download capability
on the satellite….</DIV>
<DIV
style="MARGIN: 0in 0in 0pt; FONT-FAMILY: Calibri,sans-serif; FONT-SIZE: 11pt"> </DIV>
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