New Record For Solar Cell Power Efficiency 351
mdsolar writes "Renewable Energy Access is reporting that a consortium led by researchers at the University of Delaware has achieved 42.8% efficiency with a silicon solar cell. The method uses lower concentration (factor of 20 magnification) than the previous record holder (40.7% efficiency) so that it may have a broader range of applications, since tolerances for pointing the device will be larger. They are now partnering with DuPont to build engineering and manufacturing prototypes. They expect to be in production in 2010. On a roof, such cells would require less than half the surface area to produce the same amount of power as today's standard solar panels, which have an efficiency of about 17%."
The real question.. (Score:2, Interesting)
Actually, while I'm glad they are making a more efficient solar panel, when will they make a cost-effecient solar panel for mass-adoption?
What a pointless comparison (Score:3, Interesting)
Let me guess: you'll leave how your roof empty to produce the same electricity, or take the whole roof to produce more than twice the electricity. Hard dilemma...
At this point solar energy seems inevitable in our future. Not long from now we'll have more efficient electric motors and even more efficient solar cells, so that would make it a viable backup to a car battery charge and mean you can drive for days and days at long distance without recharging.
The big money now will go to those people who manage to best make use of our existing infrastructure and our new technologies (stellar examples include Toyota's hybrids... imagine if that electric motor they use also has few solar panels to help it in the next models).
How much power? (Score:4, Interesting)
OK, but how much of a typical house's power would that supply? (I realize this depends on location and time of year.)
Or how many panels would it take to give you a daily, full recharge of a plug-in hybrid in, say, Los Angeles? (Imagine that that would do for LA's smog.)
someone convince my local government (Score:5, Interesting)
why?
because my HOA (home owners association) does not permit them. As such it would take State or local laws to override the HOA; because in many States the HOA rules have strong legal backing at the State level.
This is akin to the problems satellite TV faced in many locales. There were numerous ordinaces, both at the HOA and local level which blocked satellite dishes. Even the small ones we are accustomed to today were blocked. It took a Federal Law to end that restriction. Unfortunately its going to take another such law to allow many of us to use renewable energy. Hell, I cannot even get rain barrels approved even though they would not be visible from the street.
Another kind of efficiency (Score:3, Interesting)
These new panels may produce twice the energy, but is there any chance that they cost less than twice the dollars? What is the limiting factor in solar panel costs?
I've heard that some people are working on polymer solar panels, this would seem to deal with the dependence on expensive silicon...
Re:hmmm. (Score:3, Interesting)
One thing I have always wondered though: given the fairly large surface area of the turbine blades, would it be possible to add a photosensitive material and pull a bit of power from the sun too? Probably not terribly practical at the moment, but I seem to recall reading, probably on
Re:hmmm. (Score:3, Interesting)
As for solar power from blades' surface - the tower where the turbine is seated has more surface area than the blades, extra mass is not usually a problem, and you have a sun-facing side - the blades don't always have a sun-facing side (so you'll need to put panels on both sides), the shape of the blades is critical for efficiency, and mass in a fast rotating, very long blade is always a problem
Re:hmmm. (Score:3, Interesting)
What really depresses me is seeing the general public in interview and their complacency and dismissiveness about global climate change. People's sense of entitlement is astonishing: "I work hard so I have the right to a low-cost long-haul flight," even if we've done without that "right" for thousands of years and those flights are ultimately destroying the planet.
There is also the huge number of people who believe that the consensus of thousands of scientists on climate change is a "global conspiracy" and their fear that it may eventually mean, shock horror, more taxes. This from people who will never know hunger, get free education and health care and live in the extreme safety and tranquiltiy of a developed nation. If you think I'm making this up, try looking at the "Have Your Say" debates on the BBC News web page.
It really is enough to make me think this [vhemt.org] is a good idea.
Peter
Re:feasible (Score:2, Interesting)
I'm not too sure about that. How about a PV panel powering a ground-source heat pump? I'm willing to bet that would give you more hot water than direct solar heating, at least in most climates.
Re:hmmm. (Score:2, Interesting)
My friend lives about a mile away from a small wind farm. I is very noisy, it sounds like cars on a freeway, but far too regular. Almost like a loud heart beat. And when the sun catches the blades you get a nice strobe effect which sends you fucking crazy after an hour or so.
My friend is selling up.
I can't wait, we never visit him any more. His house sucks.
Wind farms are ok - so long as they aren't in your back yard. Solar and Nuke is the real future.
monk.e.boy
PS check my .sig for Open Source Flash Charts (bar, line, area and pie)
Massive scale solar farming (Score:3, Interesting)
In summary, the ideal location would have:
Sun
Sand
Oil
You see what I did there!?
Economically feasible? (Score:3, Interesting)
Re:hmmm. (Score:5, Interesting)
Instead of making more money, people could work less. Instead of buying all sorts of shit, people could do much cleaner things such as talking, writing, riding a bike, going to a brothel, taking a walk, singing, playing a part on a play, painting, fighting (if not pushed too far it is not necessarily bad for some people...).
It is way too simplistic to say that there is a law of nature that says we will end up using every resource available. We are supposed to be rational beings even if we often do stupid things. One of the things of being rational (or partly rational) is that we can choose what we do. We don't simply answer any call of the wild (even if there is such a thing).
We are changing from a production society to a consumer one. We are becoming a bunch of morons that just sit and receive stuff. Not very different from the Eloi in H. G. Wells' The Time Machine. I don't think just consuming is satisfying enough. It is much easier (and faster) just to watch a movie than it is to tell a story and we end up watching 10 movies. Maybe a little boredom is good for creativity. It certainly is much cleaner than riding a car 100 km to do anything "new".
Being done in New Mexico (Score:4, Interesting)
--
Register your home for solar power; fixed competitive rates for up to 25 years: http://mdsolar.blogspot.com/2007/01/slashdot-user
Re:hmmm. (Score:4, Interesting)
Unfortunately, a lot of devices are always on, like DVRs, game stations with online access, and more. They do a lot of work at night updating databases, downloading new content, etc, and simply have to remain on. The fact that an XBox 360 doesn't spin down the graphic system power and down clock it's CPUs is a design issue we can change. An Apple TV box uses less than 20 watts when "asleep" and that included downloading content over wireless. Why can't the XBox and PS3 do that? They could even drop into an even lower power state when idle, spin down the HDD, and only "wake up" every 90 minutes or so to check for content without spinning the drive up again unless it needs to.
Unfortunately, there are even more devices we can't really do anything about that are the real sappers in the house. The cable modem, wireless router/firewall, VoIP modem, second access point to cover downstairs, possibly an extra switch to add more than 4 wired devices (I have 7), and base station and answering machine for wireless phones. That's just the network. Now add the garage door opener, automatic sprinkler system, home alarm and smoke detectors (most run on house power and rechargeable batteries now), safety lights in your halls and bathrooms (night lights), and several clocks.
I work for a computer systems manufacturer. We've got a meter (magnetic ring type thing) at the office that encircles a power line and displays the power being used by the device. We have it so we can document in our white papers the power consumption of our devices. I brought it home and played with it a few months ago when having a forum argument with another individual on this. My 27" tube TV used about 2 watts when sleeping. My 37" LCD used less than 1. My PS2 used no power (but the transformer was using 2 watts). My cable box used 12 watts when asleep, DVR used between 20 and 50 depending on what it was doing when asleep. What surprised me was the coffee pot was using 3 watts when off (it has a tiny built in clock). The 2 alarm clocks we have each use 5 watts. Adding up all my idle devices I was just over 220Watts in use! 10% of that was in scent plug-ins around the house and night lights, about 20% was in our cable boxes alone. 25% was in devices I can't turn off, like the garage opener, stove clock, built in microwave, etc. Another 20% was in my home theater equipment (amp, dvd, vcr, and TVs). There were some other random devices around as well, not including my network setup...
After finding this out, I installed a "step on" power extension (like people use under the Christmas tree) in line between the wall and home theater, so I can press one switch at night to turn off all the device in the HT setup (except the DVR which has to stay pugged in all the time per the cable company or they'll void the warranty on the device). I threw out all the scent plug-ins in favor of passively diffused oils and popuri. I changed the few night lights we had out for LCD versions. I now have a programmable timer power strip in the computer room that I have 2 laptops, a small TV, a printer and a network switch hooked up to. Each night at 11:00PM the adapter cuts power to the laptops (which hibernate automatically after 15 minutes when on battery), my printers, the switch they're connected to, and the TV and cable box in there. My HTPC now uses sleep mode with Wake on Lan to save power and automatically shuts down and powers
Re:hmmm. (Score:4, Interesting)
And while you've raised the issue, shall we discuss political meddling in the opposite direction (cough EPA report cough)?
It is true that eventually we will enter a new ice age, regardless of global warming, but no one is "ignoring" this fact. It's just farther off into the future; right now, the warming is what we have to deal with. If warming is a problem, you can't just ignore it because someday it will be cooler.
Re:hmmm. (Score:3, Interesting)
My point is that the entire climate debate is no longer about science, but about politics. That goes for both sides of the table, however most politicians, scientists and activists have far more to gain by a "let's impose controls" attitude than with a "nothing to see here, move along" attitude, the global warming camp is far more influential than the sceptics camp.
The current rate of warming is nothing exceptional, and might even be just a ripple in the trend. The past has seen increases in temperature of higher rates and over a larger range. That's also the pattern to most ice ages (and we're at the peak following a small one of a couple 100 years ago): a slow decline in temperature, followed by a sharp ramp upwards.
Warming and cooling are natural trends, on which we have some (small influence). We should be worried about the warming trend, but not exaggerate our supposed influence. Thart's like worrying about a small wave, while the normal tide raises and drops the water level by several meters.
We have seen nothing yet. The current increase in temperature might be a ripple in the trend, it fits the trend itself, and it might also be caused or aggravated by human influence. But in the history of the earth it is most certainly not anything out of the ordinary.
FINALLY SOME GENUINELY GOOD NEWS (Score:2, Interesting)
Let's say something political, now. Let's hope that the Government can come together with the kind of tax incentives they are waiving around for Ethanol and Oil production to help building owners migrate to solar cells. I think we've beaten the crap out of each other enough debating energy independence and its just time to get rolling.