Kris,
It’s my understanding that this is a fairly common defect with thin framed
72 cell modules. I have noticed this convex shape mostly on modules in the
30-35mm range of frame thickness and have personally seen this with 72 cell
modules from Canadian Solar, REC, Hanwha and Yingli. I have yet
If they were deformed with a tightened strap, it seems to me that every
other module would be bowed in the opposite direction...this is not the
case. Every frame is bowed up to the glass side including the one on the
end that was installed glass side in for protection. I will check the
glass
Kristopher
OK great, well not great to me it is a shipping packaging issue, the
cardboard gap is spacing out each module and they were tightened down
untill one by one the frames came into contact and crushed them together,
the reason one is opposite is because it was installed backwards from the
Module bent or glass warped
OK Kristopher is the glass warped or is the frame bent, looking at the pic,
there is cardboard spacing each module so there is a gap. If the binders
are in the middle then that will bend one or more modules on each side, now
to bend them all the way through that center
Jay
Not sure what you are implying by this comment. I do not believe that
glass is pre bowed by any glass manufacturer that I know of nor on purpose
by a module manufacturer. Glass is manufactured shipped and stored flat on
a pallet. How were the modules Shipped? If glass down with no packing
Yes. I think that response was lacking. And it was dated over a year ago.
On Mon, Nov 18, 2019 at 9:21 AM Jerry Shafer
wrote:
> David, Wrenches
> I do not see anything talking about glass just the frame and even if they
> included glass 1 mm over 1m this is still out of that tolerance, to me
David, Wrenches
I do not see anything talking about glass just the frame and even if they
included glass 1 mm over 1m this is still out of that tolerance, to me it
sounds like poor quality control or is internally considered acceptable.
Jerry
On Mon, Nov 18, 2019 at 7:04 AM David Katz wrote:
>
Wrenches
In the way back when years Sharp had one then two braces across the short
side and stronger frames.
Regarding the glass issue to me it sounds like poor quality and little QC
of products. Again years ago l had a shipment of SolarWorld modules that
the frames were bowed out on the long
Yes good thought Jay but it strikes me if we are trying to offset the results
of anticipated bowing with crowning its time for a beefier frame or thicker
glass. REC modules went with 2 cross bars in their frame when going to 72 cell.
I’ve been observing frames get thinner over time - wondering
Good thought, Jay. That may be the case.
On Sun, Nov 17, 2019, 9:30 PM Jay wrote:
> I’m wondering if it’s designed to account for gravity sag once the modules
> are mounted. Lots of modules I’ve seen especially the larger format ones
> seem to be concave with time.
>
> If I understand
I’m wondering if it’s designed to account for gravity sag once the modules are
mounted. Lots of modules I’ve seen especially the larger format ones seem to be
concave with time.
If I understand correctly, these are bowed up which would allow them to settle
flat?
Jay
> On Nov 17, 2019, at
The banding is a good thought, Glenn, except that the one module that was
oriented the opposite way was deformed in the opposite direction. This
rules out the forklift idea, too. I will check specs. I doubt that
testing will reveal anything immediate, but I'm a bit concerned about the
potential
-wrenches] Convex modules
So, I opened up a pallet of Jinko 400 watt half cell modules yesterday and
noticed that every module was convex to the glass side. The center was 1/4
inch higher than the corners. Has anyone else seen this? Should I be
concerned? Manufacturing issue? Intentional
Probably is not the cause but hard not to notice the big ding in the
cardboard at about the right spot to cause your "deflection" from just
the right whack with the fork lift. Did it affect all the mods?
Bill
Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA
I’ve seen a system with a similar issue, visible with the naked eye looking
across the fielded mods on a fairly large ground mount (and approx. 5-7 mm of
“sag” across the short dimension of the mod). I cannot yet say that this is the
cause, but we are seeing numerous module failures with arcing
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