Distributed electrical utility is far more efficient than every little node meeting peak demand. It just requires people to share, and to value that efficiency enough to engage in collective collaborative activity.
I DO believe that some Li ion cells can be operated to last at least 10 years, some types probably 20. There is science to back this up. New testing with good correlation to reality. It is a very broad stroke to say Lithium Ion Batteries...add in a temporal aspect - in an innovative world, and you have further reason to believe in long cycle and temporal life. On Sat, May 2, 2015 at 10:19 PM, Lee Hart via EV <[email protected]> wrote: > Lee Hart wrote: > >> $6k of golf cart batteries is about 60 of them; that's around 80 KWH > >> of storage! Who on earth needs that much for a home. > > Robert Bruninga wrote: > >> My solar panels produce typically 60 to 70 kWH every sunny day. If I do >> not use every bit of it every day, then I am wasting my solar investment >> right? Hence, I sell it to the grid every day and buy it back when I >> need it at no net cost. >> > > (if you have net metering) > > If I had to store it in batteries (at your proposed 10% daily depth of >> discharge) then I would need 600 kWh of batteries or $60K investment (and >> replace it every 10 years). Again, batteries MAKE NO ECONOMICAL SENSE >> WHATSOEVER compared to grid-tie. >> > > I think the issue being discussed here is to add batteries to a grid-tie > system, so you can have power when the grid is down. NOT to eliminate the > grid completely. > > I was talking about a BACKUP battery, to power things for those brief > periods when the grid is down. Such a battery pack is rarely used; so it is > likely to wear out from old age rather than cycle life. Lead-acid batteries > makes sense for such applications. > > I agree with you that it's cheaper to use the grid as your battery. It > makes sense for the utilities too, if they could just get it through their > thick heads. > > But I do not think the state of the art in batteries is good enough yet to > use them in PLACE of the grid. Doing this will be very expensive. It's done > when you only need small amounts of power, or are so far off the grid that > it's prohibitively expensive to get connected. > > I also simply don't believe the marketing claims of battery salesmen. They > may say it will last 10-20 years; but I want a guarantee, or solid evidence > that exactly that type of battery *has* lasted 10-20 years in the real > world (not some accelerated test in a lab). > > > -- > Don't worry about people stealing your ideas. If your ideas are any > good, you'll have to ram them down people's throats. -- Howard Aiken > -- > Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 585-6737 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150502/10f508a8/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
