Shading (was MX60 question) [RE-wrenches]

[Darryl Thayer]

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Hi Mark
excellent job.  I have done a similar test using a
parallel set, I got very similar results, however once
I thought I understood the problem I did not do the
detail you did.  However I think there was a
difference in when I shaded say 1/2 of one cell, such
as the shadow of leaves, and the MPPT seemed to help
correct.  The simple case of total blockage of one
cell you are correct.  

I wish I had gone the extra mile to figure it out.
Thanks Daryl

--- Mark Byington <markbyington at sbcglobal.net> wrote:
> "Has anyone done a similar shaded modules comparison
> with SMA or other
> non-battery inverters?"
> 
> >From my previous post 3/23/04
> We have done a small experiment by shading various
> sections of a PV array, and measuring the array
> output power to convince ourselves that the bypass
> diodes in the modules do allow the rest of the
> module or the rest of the array to produce power
> when one section is shaded.  P.S. If you don't want
> to sort through all the data, just skip down to the
> Conclusions section at the bottom.


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