I’m working on a Uni. project in which I need to build the power system for
a micro satellite. It is in the form of 10x10x10cm cube.
* Where can I find high efficiency solar cells in Australia? (6 surface x
10x10cm)
* Can some one suggest a solar cell powered battery charger circuit ?
* What difference does it makes in terms of effieceny and life time for
solar cells when they are on the earth surface or in the sky?
In article <3f56a7b…@news.iprimus.com.au>, "Huang Paxia" <a…@b.com.au>
wrote:
> I’m working on a Uni. project in which I need to build the power system for
> a micro satellite. It is in the form of 10x10x10cm cube.
> * Where can I find high efficiency solar cells in Australia? (6 surface x
> 10x10cm)
> * Can some one suggest a solar cell powered battery charger circuit ?
> * What difference does it makes in terms of effieceny and life time for
> solar cells when they are on the earth surface or in the sky?
This looks like a job for Google.
You might want to shrink the solar panels a bit to allow for a shield
and shock absorbing mounting. High efficiency solar cells shatter more
easily than dry pasta. Your satellite will crush under its own weight
otherwise, and I’m not even talking about launch forces.
"Huang Paxia" <a…@b.com.au> wrote in message
news:3f56a7b3_1@news.iprimus.com.au…
> I’m working on a Uni. project in which I need to build the power system
for
> a micro satellite. It is in the form of 10x10x10cm cube.
> * Where can I find high efficiency solar cells in Australia? (6 surface x
> 10x10cm)
> * Can some one suggest a solar cell powered battery charger circuit ?
> * What difference does it makes in terms of effieceny and life time for
> solar cells when they are on the earth surface or in the sky?
Which uni?
UNSW has the best silicon solar cells around….. At a price.
Mike
- Hide quoted text — Show quoted text -
Kevin McMurtrie wrote:
> In article <3f56a7b…@news.iprimus.com.au>, "Huang Paxia" <a…@b.com.au>
> wrote:
> > I’m working on a Uni. project in which I need to build the power system for
> > a micro satellite. It is in the form of 10x10x10cm cube.
> > * Where can I find high efficiency solar cells in Australia? (6 surface x
> > 10x10cm)
> > * Can some one suggest a solar cell powered battery charger circuit ?
> > * What difference does it makes in terms of effieceny and life time for
> > solar cells when they are on the earth surface or in the sky?
> This looks like a job for Google.
> You might want to shrink the solar panels a bit to allow for a shield
> and shock absorbing mounting. High efficiency solar cells shatter more
> easily than dry pasta. Your satellite will crush under its own weight
> otherwise, and I’m not even talking about launch forces.
The original poster might want to have a look at how the Fedsat was implemented.
http://www.crcss.csiro.au/engin/fsdetail/bus.html
A description of the solar cells is at the bottom of the page.
–
Regards
David Milne
Search for Martin Green. He is a professor in Australia who specializes in
advanced solar technology.
"Huang Paxia" <a…@b.com.au> wrote in message
news:3f56a7b3_1@news.iprimus.com.au…
- Hide quoted text — Show quoted text -
> I’m working on a Uni. project in which I need to build the power system
for
> a micro satellite. It is in the form of 10x10x10cm cube.
> * Where can I find high efficiency solar cells in Australia? (6 surface x
> 10x10cm)
> * Can some one suggest a solar cell powered battery charger circuit ?
> * What difference does it makes in terms of effieceny and life time for
> solar cells when they are on the earth surface or in the sky?
In article <3f56a7b…@news.iprimus.com.au>, a…@b.com.au mentioned…
> I’m working on a Uni. project in which I need to build the power system for
> a micro satellite. It is in the form of 10x10x10cm cube.
> * Where can I find high efficiency solar cells in Australia? (6 surface x
> 10x10cm)
> * Can some one suggest a solar cell powered battery charger circuit ?
> * What difference does it makes in terms of effieceny and life time for
> solar cells when they are on the earth surface or in the sky?
You should ask these Qs on the alt.solar.photovoltaic newsgroup.
–
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
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@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
"Huang Paxia" <a…@b.com.au> wrote:
>I’m working on a Uni. project in which I need to build the power system for
>a micro satellite. It is in the form of 10x10x10cm cube.
Talk to the folks at Amsat
—
William Smith w…@compusmiths.com N1…@amsat.org
ComputerSmiths Consulting, Inc. www.compusmiths.com
Whatever cells you use, add unfolding reflectors to increase the incoming
light so you can get a little more power out of them. Silver Mylar reflectors
weigh very little.
Cheers!
Chip Shults
My robotics, space and CGI web page – http://home.cfl.rr.com/aichip
"Sir Charles W. Shults III" <aichip…@OVEcfl.THISrr.com> wrote in message
news:WGG5b.5653$Mb2.289663@twister.tampabay.rr.com…
> Whatever cells you use, add unfolding reflectors to increase the
incoming
> light so you can get a little more power out of them. Silver Mylar
reflectors
> weigh very little.
Moving parts on a sat gives rise to a hole lot of other issues.
Mike
"mikegw" <mikeg…@hotmail.spammers.must.die.com> wrote in message
news:bj6lk4$3at$1@tomahawk.unsw.edu.au…
- Hide quoted text — Show quoted text -
> "Huang Paxia" <a…@b.com.au> wrote in message
> news:3f56a7b3_1@news.iprimus.com.au…
> > I’m working on a Uni. project in which I need to build the power system
> for
> > a micro satellite. It is in the form of 10x10x10cm cube.
> > * Where can I find high efficiency solar cells in Australia? (6 surface
x
> > 10x10cm)
> > * Can some one suggest a solar cell powered battery charger circuit ?
> > * What difference does it makes in terms of effieceny and life time for
> > solar cells when they are on the earth surface or in the sky?
> Which uni?
> UNSW has the best silicon solar cells around….. At a price.
> Mike
Sorry some additional stuff. Martin Green is at UNSW. Blue sat at the same
uni is using the good cells (space rated). If by some chance you are in the
Sydney region UNSW has an open day this Saturday where among other things
blue sat will have a display along with the solar car which as some similar
( and other very different) issues.
High energy particles ( ~10MeV IIRC)will eventually degrade the performance
of cells in space. LEO will have less particles around but it still a nasty
place.
Every component that goes into a bird will need to be space rated, and
that’s where you need to talk to people who know a damn sight more about
this stuff than I.
Hope this helps
Mike
Reflectors will not help.
This is a 6-sided application that will most likely rotate in an uncontrolled
manner. Any reflector extending out will cast a shadow on at least
part of another surface (except for the instant one surface is perpendicular to
the sunlight). To get any useful voltage each side must have multiple solar
cells in series. With cells in series, the current fron the least illuminated cell
will be the limiting current. The negative effect of shadowed cells is thus
multiplied by the number of series cells.
A good design would be to wire the outputs of the six multi-cell cube sides
in parallel. Even better would be to have maximum power point tracking
for each of the six sides, but the size/weight constraints combined with a
possible rapid rotation would make this impractical.
On Thu, 04 Sep 2003 12:59:34 GMT, "Sir Charles W. Shults III" <aichip…@OVEcfl.THISrr.com> wrote:
> Whatever cells you use, add unfolding reflectors to increase the incoming
>light so you can get a little more power out of them. Silver Mylar reflectors
>weigh very little.
>Cheers!
>Chip Shults
>My robotics, space and CGI web page – http://home.cfl.rr.com/aichip
Bill Kaszeta
Photovoltaic Resources Int’l
Tempe Arizona USA
b…@kaszeta.org
On Fri, 05 Sep 2003 02:38:54 GMT, kaszetaw_remo…@mindspring.com
(Bill Kaszeta / Photovoltaic Resources) wrote:
>This is a 6-sided application that will most likely rotate in an uncontrolled
>manner. Any reflector extending out will cast a shadow on at least
>part of another surface
Are there antennas or other things extruding from the cube, that might
cast a shadow on some narrow areas of a single panel ?
>A good design would be to wire the outputs of the six multi-cell cube sides
>in parallel.
I assume that you must use separate diodes for connecting each panel
to the main bus to prevent the dark cells from discharging some of the
currents. But how about the shadows from narrow objects such as
antennas that might cast a shadow on an otherwise illuminated cell ?
I assume you would have to use multiple series strings with separate
isolation diodes to avoid a narrow shadow from taking out a complete
panel ?
>Even better would be to have maximum power point tracking
>for each of the six sides, but the size/weight constraints combined with a
>possible rapid rotation would make this impractical.
With multiple independent strings on each side, this would require 12,
24 or even more regulators.
Paul
In article <WGG5b.5653$Mb2.289…@twister.tampabay.rr.com>,
aichip…@OVEcfl.THISrr.com mentioned…
> Whatever cells you use, add unfolding reflectors to increase the incoming
> light so you can get a little more power out of them. Silver Mylar reflectors
> weigh very little.
So does that mean they blow away easily in a light breeze? :-)
–
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don’t be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You’ll be glad you did!
Just when you thought you had all this figured out, the gov’t
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
Oh, indeed they do- making them ideal for use in a vacuum, of course.
Cheers!
Chip Shults
My robotics, space and CGI web page – http://home.cfl.rr.com/aichip
In alt.solar.photovoltaic Sir Charles W. Shults III <aichip…@ovecfl.thisrr.com> wrote:
> Whatever cells you use, add unfolding reflectors to increase the incoming
> light so you can get a little more power out of them. Silver Mylar reflectors
> weigh very little.
The thermal control systems to dissapate the heat however don’t.
Mylar degrades rapidly due to free O.
Reflectors mean accurate pointing, otherwise it’ll simply shade as often
as not.
–
http://inquisitor.i.am/ | mailto:inquisi…@i.am | Ian Stirling.
—————————+————————-+————————–
"Looks like his brainwaves crash a little short of the beach…" - Duckman.