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
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