PV module temp [RE-wrenches]

[Bill Brooks]

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.


> -----Original Message-----
> From: Travis Creswell, Ozark Solar [mailto:ozsolar at ipa.net]
> Sent: Tuesday, September 25, 2001 7:09 AM
> To: RE-wrenches
> Subject: PV module temp [RE-wrenches]
>
>
> Hey Gang,
>
> I have hooked up a Heliotrope Quadra Temp four channel temp monitor that
> uses 10k sensors.  One of the channels is monitoring temp on the back of a
> module in my roof mounted PV array.  I'm seeing temps of nearly 140 F on
> sunny days that the ambient temp doesn't get past 80 F.  That seems pretty
> high.  The sensor is fine as it reads ambient temp accurately after sunset
> plus I checked it before I installed it.  I siliconed the sensor
> along with
> a small piece of Armaflex insulation on the back approximately in
> the center
> of the module.
>
> I insulated it so the temp would be more accurate but now I am
> wondering if
> I'm not holding heat in with the insulation causing the temp to
> be too high?
>  But if I don't insulate it won't it read too cool?
>
> Suggestions?
>
> Thanks in advance.
>
> Travis Creswell
> Ozark Solar
>
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