NASA on Wrenches? [RE-wrenches]

Sun Nov 4 12:15:35 PST 2007

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Are these Sanyos?  Seems as if NASA would want the highest efficiencies, 
and they could afford it.  So how do they keep the temperature limits from 
voiding the warranty?  And Sanyos are only supposed to be used in grid tie, 
but they're a little ways away from the grid...

John

At 01:43 PM 11/4/2007 -0500, you wrote:
>Probably no warranty as it was installed outside the US, but we can
>send in the panels for consideration at our expense....
>bob
>
>On 11/4/07, Steve Johnson <stevejohnson at comcast.net> wrote:
> >
> > Is this repair under warranty?  Surely a big outfit like Lockheed Martin
> > warranties their work.
> >
> > What's the per diem up there anyway?  I suppose the owner puts you up
> > and provides meals.
> >
> >
> >
> > Jeff Clearwater, Village Power Design wrote:
> > >
> > > Hi Folks,
> > >
> > > Well I think we should invite Scott Parazynski -
> > > the astronaut who repaired the P6 Solar Array
> > > today on the International Space Station (ISS) -
> > > to the Wrenches list.   I mean -  after all -
> > > consider his job and what he works on.
> > >
> > > Customer:  Taxpayers
> > > System Type:  Off-Grid
> > >
> > > Sound familiar?
> > >
> > > Some More Specs:
> > >
> > > FOR THE P6 ARRAY:
> > >
> > > Array Wattage:  32.8 KW
> > > # of Cells:  33,000 with 4100 diodes (Does not come with Evergreen Diode
> > > Kits)
> > > Array Vmp:  124 VDC (must not have consulted
> > > SMA's sizer for optimizing high voltage)
> > > Array Imp: 264 Amps !
> > > Array Dimension:  107' x 38'
> > > Array Area:  4066 ft2
> > > Array Design Life: 15 yrs (Customer plans to replace arrays on his own!)
> > > Racking: Accordion Blankets (engineering calcs
> > > not available from UniRac & no permit required -
> > > snow load not a factor)
> > > Tracking:  360º Single Axis (with 2nd axis pitch
> > > control of 4-5º) (sensor unit said to be better
> > > than even Wattsun's)
> > > Charge Control:  BCDU Battery Charge/Discharge Unit (not from Outback)
> > > Batteries:  Not L16s - They are Nickel-Hydrogen
> > > at 8 KW Charge Rate. 6 KW Discharge Rate.
> > > 38,000 rated C/D cycles at 35% DOD.  Actual Ahrs
> > > or KWhrs not clearly stated (that I could find).
> > > Design life:  6.5 Yrs.
> > > Dump Load:  14 KW per array. (Not yet available from AEE)
> > >
> > > TOTAL INTERNATIONAL SPACE STATION PV: (8 Arrays)
> > >
> > > Wattage:  262 KW
> > > Array Vmp:  124 VDC
> > > Array Imp: 2116 Amps!
> > > Array Area: 32,528 ft2
> > >
> > > Contractor: Lockheed Martin Space Systems,
> > > Sunnyvale, CA (Doesn't even have a C-46 License!)
> > > Total Contract Cost for 8 Arrays:  US $450
> > > Million (2000 dollars) (payment required upfront)
> > >
> > > Price/Watt:  $1715/Watt (it's a lot more if you
> > > want a ground mount - but UniRac will take a
> > > while to get back with you)
> > >
> > > Well much of this is just like our work - well
> > > except maybe the price - and the view.  But the
> > > part about him hanging out on the end of a 110'
> > > arm.  That feels just like some of our work!
> > >
> > > I really think he's a candidate.
> > >
> > > What do others think?
> > >
> > > Jeff Clearwater
> > > Village Power Design
> > >
> > > PS A complete description of the power
> > > electronics/storage on the ISS PV system (on the
> > > P3-P4 truss array)  can be had from:
> > >
> > > 
> http://www.boeing.com/defense-space/space/spacestation/components/docs/P3-P4.pdf
> > >
> > >
> > > and a good paper on space PV trends can be had at:
> > >
> > > http://www.aec-able.com/corpinfo/Resources/PAJ-IEEE-98.pdf
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > The Space Systems ISS solar arrays are the
> > > largest deployable space structure ever built and
> > > will be by far, the most powerful
> > > electricity-producing arrays ever put into orbit.
> > > When the Station is completed a total of eight
> > > flexible, deployable solar array wings will
> > > generate the reliable, continuous power for the
> > > on-orbit operation of the ISS systems. The eight
> > > array wings were designed and built under a $450
> > > million contract from the Boeing-Rocketdyne
> > > Division in Canoga Park, Calif., for delivery to
> > > the Boeing Company and NASA.
> > > Each of the eight wings consists of a mast
> > > assembly and two solar array blankets. Each
> > > blanket has 84 panels, of which 82 are populated
> > > with solar cells. Each panel contains 200 solar
> > > cells. The eight photovoltaic arrays thus
> > > accommodate a total of 262,400 solar cells. When
> > > fully deployed in space, the active area of the
> > > eight wings, each 107 by 38-feet, will encompass
> > > an area of 32,528-sq. ft., and will provide power
> > > to the ISS for 15 years.
> > > --
> > > ~~~~~~~~~~~~~
> > > Jeff Clearwater
> > > Village Power Design
> > > Sustainable Energy & Water Solutions for Home & Village
> > > http://www.villagepower.com
> > > gosolar at villagepower.com
> > > NABCEP (tm) Certified Solar PV Installer
> > >
> > > 877-765-2784
> > > FAX: 530-466-3663
> > > 425 Nimrod St,
> > > Nevada City, CA 95959
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~
> > > --
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
> > Steve Johnson
> > LightWave Solar Electric
> > Nashville, Tennessee
> >
> >
> > - - - -
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> >
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> >
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> >
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> >
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> >
> > Moderator: michael.welch at homepower.com
> >
> >

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