Solar cell
in [Design]
|
From: tm on 18 Apr 2010 00:22 <krw(a)att.bizzzzzzzzzzzz> wrote in message news:ne1ls5hbdtqshi0gtiqf7oai4r9cuookpc(a)4ax.com... > On Sun, 18 Apr 2010 04:57:40 +0100, Dirk Bruere at NeoPax > <dirk.bruere(a)gmail.com> wrote: > > > CAPACITY might be doubling every two years, but that just reflects the > state > of the art of government subsidies, not solar power. Eight more doublings > will likely bankrupt every country on the planet. Most are already bankrupt.
From: krw on 18 Apr 2010 00:23 On Sun, 18 Apr 2010 00:22:59 -0400, "tm" <noone(a)msc.com> wrote: > ><krw(a)att.bizzzzzzzzzzzz> wrote in message >news:ne1ls5hbdtqshi0gtiqf7oai4r9cuookpc(a)4ax.com... >> On Sun, 18 Apr 2010 04:57:40 +0100, Dirk Bruere at NeoPax >> <dirk.bruere(a)gmail.com> wrote: >> >> >> CAPACITY might be doubling every two years, but that just reflects the >> state >> of the art of government subsidies, not solar power. Eight more doublings >> will likely bankrupt every country on the planet. > >Most are already bankrupt. See!
From: eryer on 18 Apr 2010 03:02 On 17 Apr, 21:14, Don Lancaster <d...(a)tinaja.com> wrote: > They also often fail to include the synchronous inverter costs, which in > many situations will consume 150 percent of the value of ALL the > electricity sent through iit. And not using a synchronous inverter, of > course, is ridiculously more costly. Interesting...any link? About my first post, any suggestion? Thanks
From: Paul Keinanen on 18 Apr 2010 03:18 On Sat, 17 Apr 2010 13:20:26 -0400, Phil Hobbs <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >Don, you're out of date: a pal of mine at IBM is doing a 30 kW peak >system for the Saudis, using very low cost tracking technology and a new >type of Fresnel lens concentrators that run at above 2000 suns. (The >trick is cooling them, but he's also the guy that invented the liquid >metal thermal interface that Apple has used on their higher end machines.) The problem with concentrated systems is that you have to track the sun. This would not be an issue, if the panel could be operated in a protected environment, such as indoors :-). Unfortunately strong winds, sand, dust, snow and ice require quite strong tracking motors and possibly some security mechanism for parking it in a safe position during extreme conditions (horizontally in high winds, but this would not be a good idea, if much snow is expected). Especially in desert areas the dust/sand storms can deposit much dirt on the panel, so these panels will have to be cleaned quite often. For manual cleaning, the elements should have a limited size, in order to avoid building special fixtures just for cleaning. >Flat plate silicon collectors are a crock, I agree. The good thing about fixed non-concentrating panels is that sturdy mounts can be used, but due to the lower annual collection capability, the PV cell price should drop by one or two orders of magnitude, to be truly economically viable.
From: Paul Keinanen on 18 Apr 2010 02:23
On Sat, 17 Apr 2010 01:34:24 -0700 (PDT), eryer <idkfaidkfaidkfa(a)gmail.com> wrote: >Hi, >I want to realize (for hobby) a battery charger using solar cell. What kind of battery ? For instance the AAA NiMh cell capacity might be about 1000 mAh. >I've >found this sensor >http://www.clare.com/Products/SolarCell.htm >Its output voltage is high and can be used without step-up transformer >(like any typical solar cell). So, i can use >* a typical solar cell (with millivolt output voltage) and a step-up >transformer >* this sensor >For you, what is the best (performance) solution? The sensor short circuit current is up to 100 uA for the 4 V device and 50 uA for the 8 V device. Trying to charge three AAA cells with the sensor takes about 10000 hours or several years of natural sun light. Possibly usable to compensate for the NiMh cell self discharge :-) |