Solar panel efficency
in [Design]
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From: Michael A. Terrell on 10 Jun 2010 20:08 Tim Watts wrote: > > On Thu, 10 Jun 2010 18:14:50 -0400, "Michael A. Terrell" > <mike.terrell(a)earthlink.net> wibbled: > > > Tim Watts wrote: > >> > >> They do round here (southern England). PV + a little windmill to light > >> up a sign that I have never seen lit in the 100's of times I have > >> passed it. Could probably have stuck some lithium batteries in it and > >> still have it good for 5 years! > > > > > > Those fools in Brussels should have never shut down their Energizer > > Bunny breeding farm... > > One got mixi, so Farmer Rumpey had the lot shot ;-> He should have had that lead free solder bunch shot, too. Rabies makes people go insane. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: Bill Bowden on 10 Jun 2010 23:02 On Jun 9, 3:21 am, Dirk Bruere at NeoPax <dirk.bru...(a)gmail.com> wrote: > On 09/06/2010 11:04, Martin Brown wrote: > > > > > On 05/06/2010 03:11, Sylvia Else wrote: > >> On 5/06/2010 10:41 AM, Bill Bowden wrote: > >>> On Jun 3, 8:16 pm, John Larkin > >>> <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: > >>>> On Thu, 3 Jun 2010 20:00:24 -0700 (PDT), Bill Bowden > >>>> <wrongaddr...(a)att.net> wrote: > >>>>> On Jun 2, 11:55 pm, Martin Brown<|||newspam...(a)nezumi.demon.co.uk> > >>>>> wrote: > > >>>>>> You can't always trust Wiki but there is also stuff in the peer > >>>>>> reviewed > >>>>>> literature that refute his bogus claim (which to be fair might once > >>>>>> have > >>>>>> been true decades ago when solar cells were *much* thicker). > > >>>>>> See Richards& Watt (2007) > > >>>>>>http://www.inference.phy.cam.ac.uk/sustainable/refs/solar/Myth.pdf > > >>>>> Interesting article. Also found this article about a 250MW solar > >>>>> project by a SCE in the southern California area. Must have some value > >>>>> if SCE wants to build it. > > >>>> California utilities are required to get a portion of their power from > >>>> renewables. They might not if the decision were purely economic. > > > I suspect that is true, but it may not hold for too much longer if > > screen or inkjet printable semiconductors become stable enough to be > > worth using in this application. Or some other thin film PV trick. > > Since Nanosolar claim that they can now manufacture PV for $0.70 per > peak watt, and it's currently selling at around $2, it gives an > indication of the scope for prices falling when supply finally exceeds > demand by a large margin. The key being economy of scale. > And there are also slightly broken, chipped solar cells for sale on ebay or http://solarcells101.com/ for about 73 cents a cell (about 1/2 watt each) or maybe $1.45 a watt if you buy 100. They all work 95%, just have small chips on the corners and sides. Each cell is about 1.2 amps at 400mV optimum load. -Bill > -- > Dirk > > http://www.transcendence.me.uk/- Transcendence UKhttp://www.blogtalkradio..com/onetribe- Occult Talk Show
From: JosephKK on 11 Jun 2010 12:37 On Thu, 10 Jun 2010 13:22:27 -0700, BlindBaby <BlindMelonChitlin(a)wellnevergetthatonethealbumcover.org> wrote: >On Thu, 10 Jun 2010 20:15:54 +0000 (UTC), Tim Watts <tw(a)dionic.net> >wrote: > >> >>Managers, politicians and environmentalists: Nature's carbon buffer. > > > Can we use them to sop up the oil then? Best use of politicians i have heard of for a long time. Sounds even more useful than deep frying them.
From: BlindBaby on 11 Jun 2010 12:51 On Fri, 11 Jun 2010 09:37:56 -0700, "JosephKK"<quiettechblue(a)yahoo.com> wrote: >On Thu, 10 Jun 2010 13:22:27 -0700, BlindBaby ><BlindMelonChitlin(a)wellnevergetthatonethealbumcover.org> wrote: > >>On Thu, 10 Jun 2010 20:15:54 +0000 (UTC), Tim Watts <tw(a)dionic.net> >>wrote: >> >>> >>>Managers, politicians and environmentalists: Nature's carbon buffer. >> >> >> Can we use them to sop up the oil then? > >Best use of politicians i have heard of for a long time. Sounds even >more useful than deep frying them. Then, we could use them to surround the new Devil's Island we build to put the ones that survive the sopping around to keep the prisoners locked in.
From: Rich Grise on Google groups on 11 Jun 2010 14:42
On Jun 10, 12:41 pm, Mark <makol...(a)yahoo.com> wrote: > On Jun 9, 5:58 pm, Paul Keinanen <keina...(a)sci.fi> wrote: > > On Wed, 09 Jun 2010 21:29:52 +0100, Martin Brown > > <|||newspam...(a)nezumi.demon.co.uk> wrote: > > >On 09/06/2010 20:54, Paul Keinanen wrote: > > >> At higher latitudes (Central and Northern Europe), the peak > > >> consumption is during the winter months, with minimal solar > > >> production. During the summer months, when the solar production is > > >> high, the consumption is low (and nuclear power plants are shut down > > >> for annual maintenance during the summer) and hence the price that you > > >> can get from the solar electricity is quite low. > > > >I agree. PV is a dead loss at our latitude since it hardly generates > > >anything at all in the dull grey winters. To my amazement though in the > > >bleak midwinter on the few sunny days with blue skies my friends 2kW PV > > >array generates about 800W despite the low midday solar elevation of > > >just 26 degrees. > > > Thus the zenith distance would be 64 degrees. > > > At Christmas, the solar declination is -23.5 degrees, > > > Thus, your friend must be living at 40.5 degrees latitude (Barcelona, > > Athens) latitude. > > > In Spain, there are several solar thermal electric powerplants in the > > few megawatt class. > > you will know when solar PV have "made it" (become economical) when > you see the factory that makes them, has them on the roof and doesn't > use much power from the grid.. You've omitted "Doesn't absorb taxpayer dollars." Thanks, Rich |