[RE-wrenches] Convex modules

[David Katz]

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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