GoldenMotor.com Forum
General Category => General Discussions => Topic started by: gaspain on August 30, 2008, 09:38:08 PM
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these new packs just hit the market. Each pack costs about $15-$19usd at Homedepot
each pack contains 2 cells, each cell is a 123systems 3.2v 1100mah LiFePO4
A123 systems are the best batteries you can get.
Just need to figure out a wiring diagram to get 48v and 20AH....
(http://www.homedepot.ca/wcsstore/HomeDepotCanada/images/catalog/VPX3101_4.jpg)
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each cell 3,2V 1,1AH
to get 48v you need 15 cell's in serie 15 x 3,2v = 48v
to get 20AH you need 18 cell's in parallel 18 x 1,1AH = 19,8AH
total cell's 15 x 18 = 270
put 15 cell's in serie then take 18 pack's ( of 15 cell's in serie) and put them in parallel.
(-)-----48 v ----- (+)
-1-2- ..... -15- 1
-1-2- ..... -15- 2
.
.
-1-2- ..... -15- 18
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if they are 1.1Ah and not 2.3Ah, then that price is really way too high to be of any use.
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I use them in RC planes, they are good for that.
But for bike applications, I would not take them, too expensive.
Try these instead:
http://cgi.ebay.de/Electric-Bike-Bicycle-Scooter-LiFePO4-e-bike-cells_W0QQitemZ280260876823QQcmdZViewItem?hash=item280260876823&_trkparms=72%3A1129%7C39%3A1%7C66%3A2%7C65%3A12%7C240%3A1318&_trksid=p3286.c0.m14