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Steve,<br>
My understanding is that wind chill by definition only affects
living things. From Wikipedia: "The rate of heat loss by a surface
through convection depends on the wind speed above that surface: the
faster the wind speed, the more readily the surface cools. For
inanimate objects, the effect of wind chill is to reduce any warmer
objects to the ambient temperature more quickly. It cannot, however,
reduce the temperature of these objects below the ambient
temperature, no matter how great the wind velocity." <br>
<br>
So in a high wind an inverter will cool more quickly until it
reaches ambient temperature, but it won't be any warmer inside a
enclosure. If the inverter is producing enough internal heat through
inefficiency, an enclosure could slow the rate of heat loss enough
to warm surrounding internal components a bit more. But this
wouldn't have any effect on the inverter in your New Jersey example,
as the inverter can't produce heat until it's in operation.<br>
<br>
Could there be another explanation?<br>
Thanks,<br>
Allan<br>
<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font
color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font
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<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
<b>Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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<br>
On 1/19/2012 4:01 PM, Steve Jefferson wrote:
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<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Afternoon Wrenches,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">All SMA models in the US are rated for -25C
(-13F). Canadian models
are rated for both -25C and -40C.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">I highly recommend if installing in areas with
any extreme
temperatures, to build an enclosure around the units.
Sometimes with the wind
chill factor temps can be quite more than just the ambient
temp. Installing in
a conditioned building is always ideal though.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">I talked with an installer in New Jersey who had
a system that
was not turning on until late morning. He went out with in
early morning with and
took the temperature from one of the caps and it was about
-30 F. We figured
out that this extreme cold was caused by the north to south
wind hitting the
inverter, mounted on the backside of the ground mount. He
built a little wall to
protect from the wind, and the problem was solved.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: rgb(31, 73, 125);">SMA America, LLC<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: rgb(31, 73, 125);">Steve Jefferson<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size: 10pt;
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color: rgb(31, 73, 125);">Sr. Technical Service
Specialist, Sunny Family</span></i><span
style="font-size: 10pt; font-family:
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73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: rgb(31, 73, 125);">6020 West Oaks Blvd, Suite 300<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: rgb(31, 73, 125);">Rocklin, CA 95765 - 3714<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: rgb(31, 73, 125);">U.S.A.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
font-family: "Arial","sans-serif";
color: rgb(31, 73, 125);">Tel: +1 916 625 0870<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
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color: rgb(31, 73, 125);">Fax: +1 916 624-2445<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
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color: rgb(31, 73, 125);">Service Line +1 877 697 6283
(Toll Free)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt;
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color: rgb(31, 73, 125);">Email:
<a class="moz-txt-link-abbreviated" href="mailto:steve.jefferson@sma-america.com">steve.jefferson@sma-america.com</a><o:p></o:p></span></p>
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