NASA on Wrenches? [RE-wrenches]

Sun Nov 4 08:51:33 PST 2007

Absolutely

Ezra
On 3-Nov-07, at 5:31 PM, Jeff Clearwater, Village Power Design wrote:

>
> Hi Folks,
>
> Well I think we should invite Scott Parazynski - the astronaut who =20
> repaired the P6 Solar Array today on the International Space =20
> Station (ISS) - to the Wrenches list.   I mean -  after all - =20
> 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 =20
> Diode Kits)
> Array Vmp:  124 VDC (must not have consulted SMA's sizer for =20
> 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 =20
> own!)
> Racking: Accordion Blankets (engineering calcs not available from =20
> UniRac & no permit required - snow load not a factor)
> Tracking:  360=BA Single Axis (with 2nd axis pitch control of 4-5=BA) =20
> (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 =20
> Rate. 6 KW Discharge Rate.
> 38,000 rated C/D cycles at 35% DOD.  Actual Ahrs or KWhrs not =20
> 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 =20
> even have a C-46 License!)
> Total Contract Cost for 8 Arrays:  US $450 Million (2000 dollars) =20
> (payment required upfront)
>
> Price/Watt:  $1715/Watt (it's a lot more if you want a ground mount =20
> - but UniRac will take a while to get back with you)
>
> Well much of this is just like our work - well except maybe the =20
> price - and the view.  But the part about him hanging out on the =20
> 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 =20
> ISS PV system (on the P3-P4 truss array)  can be had from:
>
> http://www.boeing.com/defense-space/space/spacestation/components/=20
> 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 =20
> structure ever built and will be by far, the most powerful =20
> electricity-producing arrays ever put into orbit. When the Station =20
> is completed a total of eight flexible, deployable solar array =20
> wings will generate the reliable, continuous power for the on-orbit =20
> operation of the ISS systems. The eight array wings were designed =20
> and built under a $450 million contract from the Boeing-Rocketdyne =20
> Division in Canoga Park, Calif., for delivery to the Boeing Company =20
> and NASA.
> Each of the eight wings consists of a mast assembly and two solar =20
> array blankets. Each blanket has 84 panels, of which 82 are =20
> populated with solar cells. Each panel contains 200 solar cells. =20
> The eight photovoltaic arrays thus accommodate a total of 262,400 =20
> solar cells. When fully deployed in space, the active area of the =20
> eight wings, each 107 by 38-feet, will encompass an area of 32,528-=20
> 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]
>
>
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>
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