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

Robert Bruninga bruninga at usna.edu
Sun Feb 25 20:42:28 UTC 2018

How many years?
We are going for 10.

-----Original Message-----
From: Nick Pugh [mailto:quadpugh at bellsouth.net]
Sent: Sunday, February 25, 2018 4:35 AM
To: 'Robert Bruninga' <bruninga at usna.edu>; 'Amsat BB' <AMSAT-BB at amsat.org>
Subject: RE: [amsat-bb] Spectra Lab UTJ cell testing???

I have been told that small amounts of current are ok but don't remember
how much this is. Vermont tech university flew a cube without blocking
diodes and if lasted until orbital decay.


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Disagree I Learn

-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Robert
Sent: Friday, February 23, 2018 5:03 PM
To: Amsat BB <AMSAT-BB at amsat.org>
Subject: [amsat-bb] Spectra Lab UTJ cell testing???

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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