NASA on Wrenches? [RE-wrenches]

[Bob Ellison]

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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