I've been following the Li+ for a while, and the word is that the
Chinese made Li+ reliability is not quite there yet. About half of your
EV parts distributors carry them and half don't.
I'm close to trying them on my next EV project, but I can't imagine why
you would try them on a project that weight isn't an issue (and the
possible charging head aches)
HUP lead acid batteries have 2100 cycles to 80% DOD, and we know that's
a real number.
I'd give it another 5 years for the prices to fall more, and the
reliability to improve. There are American made Li+ that are very good,
but also very expensive, and the military gets first dibs on most of those.
Ray Walters
On 8/21/2011 8:14 PM, Darryl Thayer wrote:
your numbers sound to good. My limited to one experiance is $15,000
for 10 kWh you are talking 33600 kWh for same money. The local people
who are putting 5 kWh in to preius cars are $5,000 for 5kWh both of
these setups have elaborate battery managment systems. One of my
competors puts 10 kWh Lead acid in for $1500, and no elaborate
charging system.
I have gotten more than 10 years on a set of Rolls Surrette batteries,
with proper care. I have a sealed AGM with almost 5 years, so whAT
IS THE ADVANTAGE? It is said that the Li can do 5 times the cycles,
but I can replace.
The Li batteries no maintenance, 3000 to 5000 deep cycles, I want
them, but I can't afford
Darryl
*From:* Dave Palumbo <d...@independentpowerllc.com>
*To:* 'RE-wrenches' <re-wrenches@lists.re-wrenches.org>
*Sent:* Sunday, August 21, 2011 8:14 PM
*Subject:* Re: [RE-wrenches] Lithium Ion Phosphate for grid back up
We have a potential client for a net metered PV with battery backup
system with a serious interest in using lithium ion storage batteries.
I do not know of any systems that have used these batteries yet. From
some quick calcs I come up with 105 LiFEYPo4 3.2 volt cells. 7 strings
of 15 cells for 700 AH at 48 volts. Price is quoted at $ 125 per cell.
Here's a link the client forwarded from his research.
http://currentevtech.com/Lithium-Batteries/Thundersky/Thundersky-40ah-cell-p24.html
What are the reasons why these are not being used in home power
systems? The web site states 3,000 cycles at 80% DOD vs. 750 cycles
for typical gel storage batteries.
Also, what are your favorite inverter(s) for grid tied with battery
backup?
David Palumbo
Independent Power LLC
462 Solar Way Drive
Hyde Park, VT 05655
*/www.independentpowerllc.com /*
NABCEP Certified PV Installer
Vermont Solar Partner
23 Years Experience, (802) 888-7194
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