11-07-2012, 07:26 PM
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#81 (permalink)
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Those are nimh cells, not lifepo4. I agree its good to have something though.
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11-15-2012, 07:16 PM
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#82 (permalink)
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Corporate imperialist
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My 8 AMP20 cells arrived today.
They will not fit in a 30cal ammo can, going to have to put them in a 50cal ammo can.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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11-18-2012, 12:06 AM
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#83 (permalink)
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Corporate imperialist
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Ok soldering didn't work so here is the next best thing.
Got some brass hard ware and curled the corners of the tabs.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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11-20-2012, 11:10 PM
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#84 (permalink)
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Corporate imperialist
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I'm sure some people want to know how much power these AMP20 cells have when compared to other known batteries.
I rounded up a Snap-on battery tester, some optima batteries, my 20+28 cell 26650 packs and my new AMP20 cell stack.
I tested 4 of my AMP20 cells in serries, temperature was 60'F test voltage was 13.1v and they tested as having:
Canking power equal to 2/3 the cranking power of a new 800CCA optima red top battery.
80% of the rated cranking amps of an optima battery. (new optimas put out about 20% to 25% more CCA than what they are rated for)
The combind out put of 48 size 26650 "2.3Ah" cells configured for "12v" (7 rows 4 cells deep, 7x4 cell battery) charged up to 14.4v @ 75'F.
These 4 AMP20 cells are only half my battery I am building.
Also, I have not charged these cells, I tested them straight out of the box and I do not believe they were fully charged.
I believe full charge for LiFePO4 to be between 14.4 and 14.8 volts.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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11-20-2012, 11:32 PM
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#85 (permalink)
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Administrator
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Fully charged cells at rest will only register about 13.4V. During charging their voltage will peak at 14.6V.
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11-21-2012, 12:03 AM
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#86 (permalink)
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Corporate imperialist
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Location: NewMexico (USA)
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Right now I'm topping off the stacks of 4 with 14.8v.
During the winter I don't think 14.4v quite fully charges cold LiFePO4 batteries. Using fans, head lights, heater blower further lowers system voltage adding to the low charge problem.
__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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11-21-2012, 08:15 AM
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#87 (permalink)
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Administrator
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I wouldn't really call it a problem. Keeping the cells at a lower SOC will extend their life and you don't need the added capacity of a full cell anyway.
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11-21-2012, 09:04 AM
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#88 (permalink)
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Master EcoModder
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At $.41 per Wh and compact size, these loose A123 systems nano cells become competitive with the more ready to drop in GBS packs for use in an EV motorcycle. It will be interesting to see what you guys come up with for heat sinking cases, terminal connectors, and charge balancing modules.
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11-21-2012, 09:11 AM
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#89 (permalink)
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Administrator
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A123 cells power density is unmatched unless you go to a LiPo cell as far as I know. This makes them great for motorcycle applications.
From what I've been told by others using these cells, cooling really isn't needed. They just don't heat up all that much. Packaging is the big concern. BMS is well... personal choice.
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11-21-2012, 09:58 AM
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#90 (permalink)
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Master EcoModder
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Quote:
Originally Posted by Daox
Packaging is the big concern. BMS is well... personal choice.
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These GBS pack systems are plug n play for an EV.
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Electric Motorsport EV Parts
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