Another Lithium Ion batteries question

Excellent info everyone,thank you..
Hopefully the prices will come down soon..

You need a battery management system with LI's.

It looks like these guys have it figured out best for turn-key reliable use in an RV - but it'll cost:

http://www.lithiumion-batteries.com/products/12v-100ah-lithium-ion-battery/

free radical wrote:
Could these batteries which are for ELectric vehicles be also used in an RV for deep cycle purposes?

http://www.evwest.com/catalog/index.php?cPath=4&osCsid=naglhlcs4afl705sfec49hln20

Sure but you will be building a separate system to supply power. Li-Ion batteries will need to have the voltage very closely controlled. You are not going to just connect to the 12v system and let it rip.

A mark of how the Lithium batteries are maturing is the fact the US Navy is now studying, how, not if, to replace the monster lead-acid batteries in submarines with Lithium batteries.

free radical wrote:
Could these batteries which are for ELectric vehicles be also used in an RV for deep cycle purposes?

http://www.evwest.com/catalog/index.php?cPath=4&osCsid=naglhlcs4afl705sfec49hln20

Yes it looks like it can be done with 4 batteries in series.

I looked at this one http://www.evwest.com/catalog/product_info.php?cPath=4&products_id=51&osCsid=naglhlcs4afl705sfec49hln20 and with 4 in series, you will have about 12.6 volts 'nominal' and 14.2 max charge cut-off and 10 volts minimum cut-off. It is also rated for intermittent 800 amp draw from the battery, so it can handle most RV loads, such as a 12 volt 4 amp TV set and 7 amp water pump at the same time.

4 batteries $135 each = $535 (give or take) so it is still kinda expensive for only 100 amp hours, yet the weight is wonderful at only 8 pounds per battery or 32 pounds total!

Good luck!

Fred.