Repost please: $1/watt solar panals.
in [Basics]
|
From: vaughn on 29 Oct 2009 17:16 "Dirk Bruere at NeoPax" <dirk.bruere(a)gmail.com> wrote in message news:7kuc1aF3ak08nU1(a)mid.individual.net... > > How would one go about powering a laptop from a 12VDC supply? DC-DC > converter? Google the term "laptop auto adapter" for zillions of returns like this: http://www.powerstream.com/ADC.htm >The only things I would likely power from PV would be lights, computers >(laptops) and a fridge. My 'fridge does not like my square wave inverter (some do, some don't). Also remember that your defrost heaters can take well over 1,000 watts. My present disaster plan is to run my refrigerator only when my generator is running. Vaughn
From: krw on 29 Oct 2009 20:23 On Thu, 29 Oct 2009 01:47:17 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >krw wrote: >> >> On Wed, 28 Oct 2009 23:25:28 -0400, "Michael A. Terrell" >> <mike.terrell(a)earthlink.net> wrote: >> >> > >> >nospam(a)nevis.com wrote: >> >> >> >> Michael A. Terrell wrote: >> >> > nospam(a)nevis.com wrote: >> >> >> Michael A. Terrell wrote: >> >> >>> nospam(a)nevis.com wrote: >> >> >>>> TheM wrote: >> >> >>>>> "vaughn" <vaughnsimonHATESSPAM(a)gmail.FAKE.com> wrote in message news:hc7utq$1a1$1(a)news.eternal-september.org... >> >> >>>>>> "Don Lancaster" <don(a)tinaja.com> wrote in message news:7kooa3F39fllbU1(a)mid.individual.net... >> >> >>>>>>> For net energy, a quarter per peak pv watt is needed. >> >> >>>>>>> >> >> >>>>>>> Even then, it would be many years after a quarter per watt for actual breakeven, owing to all the previously lost energy. >> >> >>>>>>> >> >> >>>>>> Huh? I usually agree with Don on these things, but here he seems to be confusing energy break even with economic break even. I a >> >> >>>>>> perfect world they might be comparable, but I doubt if that is true in the real world. >> >> >>>>>> >> >> >>>>>> Vaughn >> >> >>>>> I think what he wants to say is that energy break even is many years down the road, >> >> >>>>> possibly decades. And fixing and maintaining it might kill the small net energy surplus. >> >> >>>>> And before we get to break even we might have new, much better technology. >> >> >>>>> >> >> >>>>> M >> >> >>>>> >> >> >>>>> >> >> >>>>> >> >> >>>> Who knows, but for a $1.98 a watt it's a good deal if you want to give >> >> >>>> it a go. I know I could run my home office off a couple of panels >> >> >>>> (laptop, printer etc.)Even having a couple would keep the lights on >> >> >>>> in an emergency. >> >> >>> >> >> >>> If there is enough sun to power the lights, you don't need them. >> >> >>> >> >> >>> >> >> >> After 4pm six months of the year, yes I do need lights. >> >> > >> >> > >> >> > The solar panels are worthless for that use without expensive, short >> >> > lived batteries. >> >> > >> >> > >> >> >> >> Tell that to my 10 year old UPS >> > >> > >> > You think there are enough good used 10 year old lead acid batteries >> >for everyone who want to use solar? >> >> All three people? > > > I thought there were only two cheap bastards who used old car >batteries? The third wants to use solar too.
From: Michael A. Terrell on 29 Oct 2009 21:18 krw wrote: > > Michael A. Terrell wrote: > > > > I thought there were only two cheap bastards who used old car > >batteries? > > The third wants to use solar too. Then he better start looking for an unlocked Prius. -- The movie 'Deliverance' isn't a documentary!
From: z on 29 Oct 2009 21:32 "vaughn" <vaughnsimonHATESSPAM(a)gmail.FAKE.com> wrote in news:hccq4j$e56$1(a)news.eternal-september.org: > > "Dirk Bruere at NeoPax" <dirk.bruere(a)gmail.com> wrote in message > news:7ku397F3aokmiU3(a)mid.individual.net... >> Does a low voltage DC house supply make sense? >> It's looking like it for lighting. > > My system is mostly for lighting, with possibly a laptop and a > portable > TV thrown in during power failures. The "40-watt-equiv" 12 volt CFL's > that I use draw 1 amp each. So far, the most I have on one circuit is > 2 of them. For minimum voltage drop, I wire my interior circuits with > #10 THHN wire. I have a 12 volt LED reading light with its own dedicated battery & small elcheapo automotive battery saver solar panel. MR-PL-DC-DL Daylight White http://www.theledlight.com/12volt-led-bulb.html has been working for more than a year w/no issues a few hours a night even with the dinky solar panel. Claims to use 2.5 watts My main system uses an inverter but the 12 volt reading light is nice because I can shut the whole thing down when I go to bed and still read > > Vaughn > > > >
From: Josepi on 30 Oct 2009 01:06
I still haven't heard of anybody. <wmbjkREMOVE(a)citlink.net> wrote in message news:o7aje51glfg5i92ehmspb8tag5eql1cn02(a)4ax.com... > On Thu, 29 Oct 2009 09:31:53 -0400, "Josepi" <JRM(a)invalid..com> wrote: > >>Ten years from batteries? Not if you actually used them and didn't just >>keep them on float. >> >>I have heard this story over and over from manufacturers but I have not >>heard of anybody, actually using their batteries and discharging them each >>night to a resonable level, that gets more than a few years of dependable >>usage out of them. > > My batteries are 14 years old and still going strong. There's a pretty > good chance they'll make 20, which is their nominal lifetime rating. > They're the bare minimum size in the context of my consumption - > generally between 12 and 15kWh per day. Only a fraction of that makes > a trip through the batteries, which is as it should be for any > well-managed setup. > > Wayne |