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 <solar1onl...@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 <ma...@berkeleysolar.com
<mailto:ma...@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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