[RE-wrenches] Convex modules

[Brian Mehalic]

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 from cell to cell, burn marks at the bussing between cells, and cracked glass; while I don’t have proof, a hypothesis is that it is the sag in the mods causing this to happen. 

There has to be some maximum allowable deflection - it might be hard to track down or get from the mfg (especially if they know why you want the value), but I would try before putting too many hands on these mods. 

Brian

> On Nov 16, 2019, at 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
> <5212725412301477941.jpg>
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