NASA on Wrenches? [RE-wrenches]
Jeff Clearwater, Village Power Design
jeffc at villagepower.com
Sun Nov 4 15:23:26 PST 2007
<x-flowed>
Hi Roy,
Well actually they might have pulled it off
during the night - trouble is their night is only
90 minutes long! They do get a 2 minute warning
though before a very abrupt sunrise where the
cell temperature changes by a few hundred degrees.
Imagine the Voc calcs!
I had another off-list response:
>I enjoyed reading your report on the space
>station and the possible inclusion of Scott onto
>the wrench list. Although his credential seem to
>be impressive at first sight I just wanted to
>point out that no inspection was done by the
>AHJ(as you so stated). So we cannot tell if his
>work is done by code. Also is this his only
>system? If it is then he will have to make a
>couple of more trips to different jobs in his
>service territory before we should consider his
>application.
Cheers!
Jeff C.
>Did I miss something?
>What's all the fuss about with working on a live high voltage array?
>Couldn't they do this repair at night? ;-)
>
>Roy Butler
>NABCEP Certified Solar PV Installer®
>NYSERDA eligible PV & wind installer Four Winds Renewable Energy, LLC
>8902 Route 46
>Arkport, NY 14807
>607-324-9747
>www.four-winds-energy.com
>
>Although no trees were killed in the sending of
>this message, a large number of electrons were
>terribly inconvenienced.
>
>
>
>
>John Raynes wrote:
>
>>
>>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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--
~~~~~~~~~~~~~
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
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~
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