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

[Robert Bruninga]

How many years?
We are going for 10.
Bob


-----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.







nick

Cell      337 258 2527

Helping UL become a world Class Engineering  and Educational School
Disagree I Learn


-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Robert
Bruninga
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.

Bob
_______________________________________________
Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available to
all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb