[RE-wrenches] Lithium Ion Phosphate for grid back up

[Darryl Thayer]

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 <dave at independentpowerllc.com>
To: 'RE-wrenches' <re-wrenches at 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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