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want to run 2 strings on one MPPT
#11
You might find this youtube interesting by @Adam Welch "Solar Panel Shading" https://youtu.be/BRMLvzEgvcE It goes into a detailed explanation and actual experiment related to @ajw22's comments and shading/reverse current in a string of panels. Smile
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#12
(09-07-2019, 12:38 AM)OffGridInTheCity Wrote: You might find this youtube interesting by @Adam Welch  "Solar Panel Shading" https://youtu.be/BRMLvzEgvcE  It goes into a detailed explanation and actual experiment related to @ajw22's comments and shading/reverse current in a string of panels.  Smile


Interesting indeed.  Always nice to see practical tests confirm or correct the theoretical.

Some notes to the video relating to the original thread question:
The 0.2V~0.5V loss caused by the reverse blocking diode is negligible in an string application with 300+V.
The MOSFET "ideal diode" module is designed to handle much lower voltages.  Very likely to blow up in a string application.
Modular PowerShelf using 3D printed packs.  30kWh and growing.
https://secondlifestorage.com/t-AJW22-s-...PowerShelf
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#13
I would like to know what the panel specs are and also what the mppt can handle. That is required to give the man a proper answer I would say. That is besides the fact that all this talking about diodes is not necessary since you don't need them when you parallel 2 strings even though they are not orientated the same.
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#14
"The effect of reversely induced electric stress currents has demonstrated to be a very important factor in determining not only the performance and efficiency of PV solar cells and modules, but it has also proven to be a dominant factor in determining the operating lifetime of the cells."

.pdf   82078047.pdf (Size: 454.8 KB / Downloads: 8)
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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