PV module temp [RE-wrenches]

[Travis Creswell, Ozark Solar]

Bill,

It's about 2' off the asphalt shingled roof.


Smitty, you're the one who taught me to insulate those 10k sensors!  Of
course that's on the thermal stuff.

That's a good idea Jay.  I'll try that.  I've got one channel for the PV. 
One for the ambient temp.  One each for the thermal inlet and outlet on the
roof.  My new shop has radiant in floor heat tied into 160ft2 (5- 4x8's) of
thermal along with passive solar and over a kW of PV.  I don't plan on
needing any supplemental heat when the sun shines and we'll see how many
days of clouds I can coast through this winter.  This will be the first
year.

Thanks all

Travis

----------
>From: Bill Brooks <billbrooks7 at earthlink.net>


>Travis,
>
>The most important thing is good thermal contact. Often a heat conducting
>paste may be used if there is concern over good contact. If you have good
>contact, insulating the back side of the sensor might be in order, but not
>the area around the contact point. 140 F is quite normal for moderate days.
>Roof-mounted arrays can get much hotter than 140 F. How high off the roof is
>it mounted?
>
>Bill.
>
----------
>From: Smitty <smitty at aaasolar.com>

>Trav, the insulation is probably giving you a high reading. The sensor should be
>exposed to the same atmosphere that the back of the panel is. Smitty.
>

----------
>From: jay peltz <jay at asis.com>

>Hi Travis,
>
>I bet its pretty close, but why not try using another channel that is attached
>but not insulated just next to the other sensor.  That should give you a close
>idea of whats happening.
>
>jay

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