Dave;
The way modern high-performance electric vehicle manufacturers are able
to wrest such awesome performance out of Lithium batteries of any type
is by using extremely sophisticated battery management systems (BMS).
Per-string and per-cell monitoring *and* control is not uncommon, and
temperature is also critical (note the battery bank cooling system in
the Tesla Roadster). Also note that these sophisticated monitors and
controls also extend to discharge, not just charging.
I don't think you'll find many commercial balance of system components
that can deal with Lithium battery technology of any type right now,
outside the EV world---and they aren't trying to make household 120/240v
AC in an EV.
It would be a fascinating, exciting and challenging project to try --
but i wouldn't offer a warranty of any sort, on *any* of the system
components. Also note that with Thundersky your tech support would be
coming from China.
Dan Fink
Executive Director;
Buckville Energy Consulting
Buckville Publications LLC
NABCEP / IREC / ISPQ accredited Continuing Education Providers
http://www.buckville.com/
[email protected]
970.672.4342 (voicemail)
970.373.1311 (fax)
Dave Palumbo wrote:
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
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