metering solar irradiance and temperature [RE-wrenches]

[Joel Davidson]

I use a Fluke 80T-150U Temperature Probe for on-site temperature readings. It
plugs into my handy multi-tester. Shortcomings:
1) point sensor vs. pad so you have to carefully feel around a couple spots on
the back or front of cells without scratching anything
2) slow response, waiting for the sensor to go from say 25 C ambient to 45 C
cell temperature seems to forever, probably 30 seconds
3) eats up 9-volt batteries if you forget to turn the probe off.
With experience you can get within 5% of power measured by expensive lab and
field equipment using the Daystar, multitester and temp probe.

Baran Galocy wrote:

> Kurt,
>
> The DayStar is great.  It allows me to show a customer (and myself) just how
> many of those watts are actually getting through.  I would recommend a
> GREENLEE THH-500 also.  This is a "low cost" (under $150.00) digital,
> laser-guided thermometer.  When you take readings in Summer with the
> DayStar, it is good to know the temperature of the face of your panels.
> This allows you to do the math and incorporate temperature as a variable of
> performance.  1,000 watts per square meter shows up as something
> considerably less when translated through panels that are cooking at 150
> degrees F.
>
> Regards - Baran
>
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