PV module temp [RE-wrenches]

[Joel Davidson]

Single crystal and polycrystalline cell temperature is approx. 20 degrees C. (68 F.)
above ambient air temperature. The sensor should measure the cell temperature, not
the atmosphere at the back of the panel.

Smitty wrote:

> 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.
>
> "Travis Creswell, Ozark Solar" wrote:
>
> > 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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