[amsat-bb] Spectra Lab UTJ cell testing???

Robert Bruninga bruninga at usna.edu
Fri Feb 23 23:03:21 UTC 2018

When you feed voltage into a UTJ Multi junction solar cell it emits RED
light all across the solar cell.

This is a good test to see if the cell is 100% involved or there are low
performing sections.

But I need to fully understand what is going on!!

Does this damage the cell?  How bright can it get?

My problem is that when I feed current into the solar panel to simulate
sun on the panel, the solar cells all light up and so some current is
being bypassed into the cells and not getting to the spacecraft.  Is this
damaging to the cells?

I have not been able to find any links to a description of this kind of
cell testing and limits.


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