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pamo ----- Original Message ----- From: Kris Kirby <[EMAIL PROTECTED]> Date: Tuesday, September 17, 2002 4:31 am Subject: Re: storing power > On Tue, 10 Sep 2002, Brendan Kirby wrote: > > Round trip efficiency for pumped storage is about 80%. > > Really? I did not know that. > > I've been harboring delusions of building a PV / Wind power system for > quite some time. The one nagging factor with the way that I want > to do it > is that I don't want to waste any generating capacity. If they > batteriesare full, find another way to store the energy. Pumped > storage, I must > say, has "nifty factor" written all over it. The problems, > however, are > numerous. > > One is that you can only count on a pump to push water so far > uphill. Two > is that you're probably going to have to start with a submersible > (well) pump and go from there adding pumps as necessary to insure > operation. Then you've still got to deal with the turbine, or > generationside. > > The way I thought about implementing this just a few moments ago > would be > to have two (covered) pools or tanks, one about 45 - 100 feet up a > hilland the other at the bottom. You use a submersible well pump > (should be > good for at least 100 - 200 feet of head) to pull the water out of > pool #1 > and send it uphill to pool #2. Then when capacity starts dropping > of and > the SOC comes down a bit, you switch the valves over (obviously > will have > to be electric high-pressure valves) and dump the water through a > turbineand generator. This should provide a little bit of a "hump" > in the middle > of the night so that the batteries don't go so low in the morning. > > Of course, this ignores the fact that if you are 100% PV already, you > probably have more than enough PV capacity and battery capacity to > do the > job. I'm just looking at storing wind power for later use. And on that > note, I just realized that an old windmill is the perfect solution > -- less > conversion loss, and it pumps water to begin with! > > -- > Kris Kirby, KE4AHR <[EMAIL PROTECTED]> TGIFreeBSD IM: > 'KrisBSD' "BIG BROTHER IS WATCHING YOU!" > This message brought to you by the US Department of Homeland Security > >
