[RE-wrenches] Convex modules

[Jerry Shafer]

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 <dkatz at backwoodssolar.com> wrote:

> Here is a response from Jinko:
>
>
>
> On Mon, Nov 18, 2019 at 7:39 AM Jerry Shafer <jerrysgarage01 at gmail.com>
> 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 side, l contacted them and they
>> stopped production to fix the problem, what has this module manufacturer
>> said?
>>
>> On Mon, Nov 18, 2019, 7:24 AM Jeff Clearwater <
>> jeffc at villagepowerdesign.com> wrote:
>>
>>> 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
>>> how a 30 mm frame could do the job on 72 cell mods when we used to have
>>> twice that on 60 cell mods. It’s great to save aluminum and weight but not
>>> at the expense of panel life. Can’t imagine the impact resistance goes up
>>> with less support never mind possible degradation to the wafers due to
>>> flexing?
>>>
>>> Any panel manufacturers on the List that can comment?  Any other modules
>>> besides RECS using cross bars?
>>>
>>> Thanks
>>>
>>> Jeff Clearwater
>>>
>>> Sent from my iPhone
>>>
>>> On Nov 17, 2019, at 2:25 PM, Jay <jay.peltz at gmail.com> 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 correctly, these are bowed up which would allow them to
>>> settle flat?
>>>
>>> Jay
>>>
>>>
>>>
>>> On Nov 17, 2019, at 2:17 PM, Kristopher Schmid <solman at legacysolar.com>
>>> wrote:
>>>
>>> 
>>> 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 long term effects.
>>>
>>> On Sat, Nov 16, 2019, 9:12 AM Kristopher Schmid <solman at legacysolar.com>
>>> wrote:
>>>
>>>> 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?
>>>>
>>>> Thanks,
>>>> Kris
>>>>
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