This is a follow up on an old post about a failed
LKD module. I wrote that I'd give follow up
information when it became available.
It turned out that some of the fine circuitry on
the face of the module was fried: according to my friend, it looked welded.
Drake
At 09:59 AM 6/19/2019, drake.chamber...@redwoodalliance.org wrote:
Dave,
I gave the module to a friend who is going to go
into the J-Box. If there are any conclusions I
can post them on the list, but don't know when she plans to attempt the repair.
Thanks,
Drake
----- Original Message -----
From:
"RE-wrenches" <re-wrenches@lists.re-wrenches.org>
To:
"RE-wrenches" <re-wrenches@lists.re-wrenches.org>
Cc:
Sent:
Tue, 18 Jun 2019 14:57:47 -0400
Subject:
Re: [RE-wrenches] Low OC Voltage
Drake,Â
If you want to find out for sure, often you
should be able to open up the jbox on the back
and poke around. It certainly is somewhat
destructive, but you may find that either a
diode is not the issue, or it is fixable.
Sometimes you do have to pull out potting
though. I have restored modules for second hand
use that otherwise would have ended up in the
dump this way. Obviously though it wont be like new anymore.
Cheers,Â
Dave
Dave Tedeyan, PE
Senior Engineer | Taitem Engineering, PC
110 South Albany Street | Ithaca, NY 14850
o. 607.277.1118 x121Â f. 607.277.2119
<http://www.taitem.com>www.taitem.com
Solar  Sustainability  Energy  Design
B-Corporation Best for the World 2018 Honoree
On Thu, Jun 13, 2019 at 10:26 PM
<<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@redwoodalliance.org>
wrote:
The outside temperature was unseasonably cool, maybe 55 degrees.
----- Original Message -----
From:
"RE-wrenches"
<<mailto:re-wrenches@lists.re-wrenches.org>re-wrenches@lists.re-wrenches.org>
To:
"RE-wrenches"
<<mailto:re-wrenches@lists.re-wrenches.org>re-wrenches@lists.re-wrenches.org>
Cc:
Sent:
Thu, 13 Jun 2019 09:25:39 -0400
Subject:
Re: [RE-wrenches] Low OC Voltage
Drake,Â
At what temperature did you get that reading? If
it was very hot, then that could just be poor
temperature characteristics of the module. I
have run into some modules, specifically
Suniva's, that just do very poorly in warm
temperatures. Otherwise, if the voltage is
approximately 2/3 of what you would expect, then
it is usually an issue in the module jbox.
Either a bad diode or failed solder connection.
This case is odd, because it is a little bit
more than 2/3 the voltage. So maybe it was very
cold with 1/3 the module not working, or very
hot. Also, taking a look with an IR camera when
the system is functioning can often show if 1/3
the module is not working or if there are some bad cells in the module.
Cheers,Â
Dave
Dave Tedeyan, PE
Senior Engineer | Taitem Engineering, PC
110 South Albany Street | Ithaca, NY 14850
o. 607.277.1118 x121Â f. 607.277.2119
<http://www.taitem.com>www.taitem.com
Solar  Sustainability  Energy  Design
B-Corporation Best for the World 2018 Honoree
On Tue, Jun 11, 2019 at 7:05 PM Drake
<<mailto:drake.chamber...@redwoodalliance.org>drake.chamber...@redwoodalliance.org>
wrote:
Hello Wrenches,
Would you expect a low open circuit voltage in a
module to be due to a problem in the J-box /
diodes or the module itself? The OC voltage read
about 28.3 V, where as the STC OC voltage of the module is 37.3.
The module is an LDK 240, which means no warranty.
Thanks,
Drake
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
<http://athens-electric.com/>http://athens-electric.com/
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