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
Bob, I've played with all kinds of solar cells and I've never tried applying voltage to them without a blocking diode. Please keep us, at least me, up on any findings. --- Ciao baby, catch you on the flip side. GEO
Time flies like an arrow, fruit flies like a banana.
From: Robert Bruninga bruninga@usna.edu To: Amsat BB AMSAT-BB@amsat.org Sent: Friday, February 23, 2018 3:04 PM 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@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
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@amsat.org] On Behalf Of Robert Bruninga Sent: Friday, February 23, 2018 5:03 PM To: Amsat BB AMSAT-BB@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@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
How many years? We are going for 10. Bob
-----Original Message----- From: Nick Pugh [mailto:quadpugh@bellsouth.net] Sent: Sunday, February 25, 2018 4:35 AM To: 'Robert Bruninga' bruninga@usna.edu; 'Amsat BB' AMSAT-BB@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@amsat.org] On Behalf Of Robert Bruninga Sent: Friday, February 23, 2018 5:03 PM To: Amsat BB AMSAT-BB@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@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
participants (3)
-
GEO Badger -
Nick Pugh -
Robert Bruninga