[RE-wrenches] Cooler Modules

[boB at midnitesolar.com]

Absolutely right, Bill.
We have a couple of these cameras and they are very handy.

These cameras are also good for detecting high currents through fuses 
(if you can see the
fuses) and bad connections, etc.

We had a Chinese module laying around (Astronergy  250W) and it was 
sunny so I took a
few pix.  Short circuit and open circuit.

You can see at least 15 to 20 degrees C difference sometimes.   I will 
have to check
some other modules but I don't know if any manufacturers match cells ?

These pix are from the back of the module.  You have to be careful of 
reflections more
from the front.
The temperature at the top-left is where the crosshair cursor is and the
right scale is maximum (whitest) temperature and lowest (darkest) 
temperature
in view.


http://www.eskimo.com/~bgudgel/IR_0050.jpg

http://www.eskimo.com/~bgudgel/IR_0094.jpg


Here is one with the module open circuit.  Note high and low 
temperatures are around 44 C.

http://www.eskimo.com/~bgudgel/IR_0030.jpg



On 9/14/2014 8:51 AM, Bill Hoffer wrote:
> Bill
>
> Flir E40,  works well and has some good features that make it easy to 
> write reports with the software.  E60 is similar with additional 
> features, but a little more expensive.  IMHO any of the E - series is 
> a pretty good bet.
> Bill
>
> /Sent from my Verizon Wireless 4G LTE DROID/
>
>
> Bill Loesch <solar1online at charter.net> wrote:
>
>
> Bill
>
> What kind of thermal camera are you using for this kind of inspection? 
> Satisfied? Comments?
>
> Thanks,
> Bill Loesch
> Solar 1 - Saint Louis Solar
> 314 631 1094
> On 10-Sep-14 11:04 PM, Bill Hoffer wrote:
>> Mark
>>
>> Loaded modules will have hotter cells. I know this from searching for 
>> bad cells with a thermal camera.  At open circuit I could not see a 
>> difference, but short circuit or loaded I could see 20 - 30 C 
>> increase in mismatched cells .
>>
>> Bill
>>
>> On Wed, Sep 10, 2014 at 9:43 PM, Mark Frye <markf at berkeleysolar.com 
>> <mailto:markf at berkeleysolar.com>> wrote:
>>
>>     Folks,
>>
>>     Two identical PV modules are mount in an identical fashion and
>>     exposed to identical irradiance.
>>
>>     One module is open circuit. The other is connected to a load and
>>     producing power.
>>
>>     Is there a difference in the temperature of the two modules? If
>>     so, which one is cooler?
>>
>>     Mark Frye
>>     Berkeley Solar Electric Systems
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>> -- 
>> William Hoffer
>> 161 SE Fourth Ave
>> P.O. Box 1823
>> White Salmon, WA 98672-1823
>> sunengser at gmail.com <mailto:bhoffer at sunergyengineeringservices.com>

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