NASA on Wrenches? [RE-wrenches]

[Steve Johnson]

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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