Whatever the situation is today with Li ion cells, it will be very different in a few years or a decade. There is little economy of scale in the industry. Understanding of proper QA by users or by many suppliers is almost non-existent. Besides which prior methods and equipment for testing have been very poor.
This is all going to change. On Fri, May 1, 2015 at 12:34 PM, via EV <[email protected]> wrote: > While Lithium batteries make a lot of sense for vehicles where energy > density to weight is a big deal, I'm not sure of the advantage for > stationary installations. Cost for Lithium is still a big issue. An > ~40kWh pack of deep cycle, lead acid batteries that provide battery backup > for my house costs ~$5k. > > Another problem is integration with current charge/inverters. I know that > my charge/inverter does not support Lithium. Not sure if the BMS in the in > the PowerWall integrates with current charge/inverters or what > modifications would be necessary. Plus a decent charge inverter rated for > 4500kW continuous costs about $4k. > > Now if the gigafactory drives down the price of Lithium batteries and the > electronics integrate with current charge/inverters, then the above is > moot. Till then I'll stick with lead. > > As an aside, my conversion originally used lead acid for two years. When > I switched to lithium four years ago I re-tasked the old lead acid > batteries to my solar backup and got another three years from them. I > currently have ~160kWh of batteries in my garage right now...40kWh as > stationary backup, 40kWh in my EV conversion, and 85kWh in a Model S. I > can always use the 40kWh in my conversion to dump charge my stationary > batteries. Can't do that with the Model S yet. > > Barry > > -----Original Message----- From: len moskowitz via EV > Sent: Friday, May 01, 2015 11:44 AM > To: Peri Hartman > Cc: evdl > Subject: Re: [EVDL] Tesla plugs into new market with home battery system > > www.teslamotors.com/powerwall > > > The $3k pack is rated at 7 kWhr and the $3.5k pack is rated at 10k kWhr. > > > It doesn't include an inverter. > > > > Len Moskowitz > > > ----- > > On Fri, May 01, 2015 at 10:35 AM, Peri Hartman via EV wrote: > > >> >> http://www.seattletimes.com/business/tesla-expanding-battery-technology-to-homes-businesses/ >> >> The CEO of electric car maker Tesla Motors hopes to park hundreds of >> millions of large, solar panel-connected batteries in homes and businesses >> so the world can disconnect from power plants — and he can profit. On >> Thursday night, before an adoring crowd and a party-like atmosphere, Musk >> unveiled how he intends to do it. >> ... >> >> The system will carry a suggested price of $3,000 to $3,500, depending on >> the desired capacity. Installation will be extra. >> ... >> >> (I didn't see any mention of $/kwh) >> >> Peri >> >> _______________________________________________ >> 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) >> >> >> _______________________________________________ > 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) > > > _______________________________________________ > 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/20150501/22989ba5/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)
