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

Nick Pugh quadpugh at bellsouth.net
Sun Feb 25 09:34:44 UTC 2018

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.


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
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.

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

More information about the AMSAT-BB mailing list