Solar panel efficency
in [Design]
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From: D Yuniskis on 31 May 2010 13:43 MooseFET wrote: > On May 30, 6:10 pm, D Yuniskis <not.going.to...(a)seen.com> wrote: >> Hi Tim, >> >> >> >> Tim Wescott wrote: >>> On 05/30/2010 02:20 PM, Robert Baer wrote: >>>> I did a survey and this is the best i got. >>>> Makers: (1) BP Solar technology: Advanced multicrystalline & >>>> monocrystalline silicon nitride; (2) First Solar modules: Thin film >>>> cadmium telluride; (3) Nanosolar: Thin film CIGS (copper indium gallium >>>> selenium); (4) Sharp: Monocrystalline & polycrystalline (silicon?) (Thin >>>> film?); (5) Evergreen Solar: Silicon (Mono? Poly? not mentioned). >>>> The questions in above are due to incompleteness of disclosure (on the >>>> web). >>>> Of those technologies, which one is the MOST efficient in conversion of >>>> light / solar energy to electrical power (assume ideal load for given >>>> panel)? >>>> Is there another (commercially available) technology even more efficient? >>> Big projects seem to lean toward concentrating a bunch of light on a >>> Stirling engine. http://www.stirlingenergy.com/. >> Agreed. These folks, IMHO, really *blew* a perfect >> "market opportunity". :< Seems like a 10KW stirling >> engine turning a genset would be *perfect* for a large >> portion of the population (sun belt) -- especially >> considering the cooling load they can carry! > > A 1KW engine may be a better design. A 1 meter square system could be > mass produced and then installed in as many increments as needed. I figured 5KW would be best bang for the buck as it would allow cooling load to be offset 1:1. I wonder just what the magnitude of that load is for a region like the desert southwest? (I should go hunt it down) How many nukes to run our ACbrrrs??
From: Winston on 31 May 2010 15:05 On 5/30/2010 5:21 PM, Tim Wescott wrote: (...) > And I _still_ think that the criteria should be the net energy return > over the whole lifetime of the product -- mean _after_ you take into > consideration the entire extract/manufacture/install/dispose cycle of > the panel into account, _including_ the trees you'll need to chop down > to make room for them and some projections of the proportion of panels > that will be retired early due to defects, obsolescence, vandalism, > remodeling, and just plain accident. If you were in the market for a generator set for an off grid home, would you place any importance at all on the entire life cycle of that device? Do manufacturers even make that information available? Do you actually care what proportion of the energy used in production of the aluminum castings was renewable? If manufacturer "A" accepts old generators back for recycling and manufacturer "B" didn't but produced a more efficient generator, would you even consider an "A" generator over a "B" generator, all else being equal? Would you really decide against a generator only because it is stolen at a slightly higher rate than it's competitors in the market? --Winston
From: Michael A. Terrell on 31 May 2010 16:02 MooseFET wrote: > > On May 31, 5:43 am, John Fields <jfie...(a)austininstruments.com> wrote: > > On Mon, 31 May 2010 22:25:27 +1000, Sylvia Else > > > > <syl...(a)not.here.invalid> wrote: > > >On 31/05/2010 1:54 PM, Robert Baer wrote: > > >> No real estate restrictions but do not need much panel area to light a > > >> small room. > > > > >I'd just open the curtains myself. > > > > --- > > Where I live, sometimes it gets dark outside. > > Thats when you are supposed to go to bed and sleep. It is nicely > arranged so the world is dark at bed time. Great, if you can do it. I went to bed at 11:00 pm last night I woke up at 1:30 and couldn't get back to sleep till 8:00 am. I woke up a few minutes till 3:00 pm. My VA 'doctor' refuses to give me anything to help me restore my sleep cycle. Instead, he told me to use an over the counter cough medicine that requires a signature. Buy more than a couple bottles a year, and you go to jail. When he asked if I was in any pain I told him yes, and that it was aggravating the sleep problems. He told me he wouldn't prescribe anything, 'since you are already on a high dosage of Gabapentin. Gabapentin only helps with pain from Diabetic Neuropathy, not back and shoulder pain. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: Spehro Pefhany on 31 May 2010 16:11 On Mon, 31 May 2010 16:02:00 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >MooseFET wrote: >> >> On May 31, 5:43 am, John Fields <jfie...(a)austininstruments.com> wrote: >> > On Mon, 31 May 2010 22:25:27 +1000, Sylvia Else >> > >> > <syl...(a)not.here.invalid> wrote: >> > >On 31/05/2010 1:54 PM, Robert Baer wrote: >> > >> No real estate restrictions but do not need much panel area to light a >> > >> small room. >> > >> > >I'd just open the curtains myself. >> > >> > --- >> > Where I live, sometimes it gets dark outside. >> >> Thats when you are supposed to go to bed and sleep. It is nicely >> arranged so the world is dark at bed time. > > > Great, if you can do it. I went to bed at 11:00 pm last night I woke >up at 1:30 and couldn't get back to sleep till 8:00 am. I woke up a few >minutes till 3:00 pm. My VA 'doctor' refuses to give me anything to >help me restore my sleep cycle. Instead, he told me to use an over the >counter cough medicine that requires a signature. Buy more than a couple >bottles a year, and you go to jail. > > > When he asked if I was in any pain I told him yes, and that it was >aggravating the sleep problems. He told me he wouldn't prescribe >anything, 'since you are already on a high dosage of Gabapentin. >Gabapentin only helps with pain from Diabetic Neuropathy, not back and >shoulder pain. Michael, have you been tested in a good sleep lab? You might have some other problems such as apnea or restless leg syndrome that are preventing you getting a good night's sleep, and they'll only aggravate other problems (up to and including triggering a heart attack or stroke). It's well worth doing IMHO, though uncomfortable being wired up to all the instrumentation.
From: krw on 31 May 2010 16:18
On Mon, 31 May 2010 16:11:46 -0400, Spehro Pefhany <speffSNIP(a)interlogDOTyou.knowwhat> wrote: >On Mon, 31 May 2010 16:02:00 -0400, "Michael A. Terrell" ><mike.terrell(a)earthlink.net> wrote: > >> >>MooseFET wrote: >>> >>> On May 31, 5:43 am, John Fields <jfie...(a)austininstruments.com> wrote: >>> > On Mon, 31 May 2010 22:25:27 +1000, Sylvia Else >>> > >>> > <syl...(a)not.here.invalid> wrote: >>> > >On 31/05/2010 1:54 PM, Robert Baer wrote: >>> > >> No real estate restrictions but do not need much panel area to light a >>> > >> small room. >>> > >>> > >I'd just open the curtains myself. >>> > >>> > --- >>> > Where I live, sometimes it gets dark outside. >>> >>> Thats when you are supposed to go to bed and sleep. It is nicely >>> arranged so the world is dark at bed time. >> >> >> Great, if you can do it. I went to bed at 11:00 pm last night I woke >>up at 1:30 and couldn't get back to sleep till 8:00 am. I woke up a few >>minutes till 3:00 pm. My VA 'doctor' refuses to give me anything to >>help me restore my sleep cycle. Instead, he told me to use an over the >>counter cough medicine that requires a signature. Buy more than a couple >>bottles a year, and you go to jail. >> >> >> When he asked if I was in any pain I told him yes, and that it was >>aggravating the sleep problems. He told me he wouldn't prescribe >>anything, 'since you are already on a high dosage of Gabapentin. >>Gabapentin only helps with pain from Diabetic Neuropathy, not back and >>shoulder pain. > >Michael, have you been tested in a good sleep lab? You might have some >other problems such as apnea or restless leg syndrome that are >preventing you getting a good night's sleep, and they'll only >aggravate other problems (up to and including triggering a heart >attack or stroke). It's well worth doing IMHO, though uncomfortable >being wired up to all the instrumentation. I didn't find the instrumentation all that uncomfortable. The bed, OTOH, was enough to make a camel sway-back. It *had* to have been designed to prevent sleep. |