A123 3 cell versus GP3300 6 cell in a Traxxas Rustler  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> A123Racing Support >> A123 3 cell versus GP3300 6 cell in a Traxxas Rustler
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A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/22/2006 1:14:58 AM   
everydayflyer



Posts: 893
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Running a 15X2 motor and stock ESC with a computer fan added for cooling.
This pack has also been flown in a couple of RC airplanes.


For those who would like to read a Thread on my experience with A123s

http://www.rcgroups.com/forums/showthread.php?t=578179&pp=15

Charles

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< Message edited by everydayflyer -- 11/22/2006 9:53:35 PM >
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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/22/2006 1:36:31 AM   
guver


 

Posts: 8541
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		That's very interesting, nice to see the spikes and the average.

How about adding even MORE weight to the gp by adding 1 cell?

Haha fair is fair , right?

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/22/2006 3:12:54 AM   
everydayflyer



Posts: 893
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From: Buchanan, GA, USA
Status: offline 		More cells more volts more better?



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< Message edited by everydayflyer -- 11/22/2006 3:14:20 AM >

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/22/2006 3:28:23 AM   
guver


 

Posts: 8541
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Status: offline 		Hmm, maybe better add a couple? lol.

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 2:25:09 AM   
everydayflyer



Posts: 893
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		My guess is that a wheel chair would most likely have a 80 to 100Ah 12 volt battery so would require a bunch of A123 cells. Perhaps along the lines of a 4S30P to 4S 40P. That's 120 to 140 cells which would make the cost on the expensive side. Now if you do not need as much operating time between charges then perhaps a 4S 10P (40 cells) would be enough but still not cheap.
Simple fact is the Pb (lead acid) batteries are the most cost effective high capacity / high amp. batteries there are at a releative inexpensive cost.


RC Groups B&C is my regular hang out but I do frequent other interesting boards from time to tme.

Charles

< Message edited by everydayflyer -- 11/23/2006 2:28:32 PM >

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 2:28:07 PM   
everydayflyer



Posts: 893
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		I just realized that this is a Support Forum and as such perhaps I should have not entered my post here.

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 5:19:33 PM   
guver


 

Posts: 8541
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From: LaGrange, OH, USA
Status: offline 		Hmm, maybe so. But I liked it. Can you zoom in real close on the voltage dips and current spikes?

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 6:15:07 PM   
everydayflyer



Posts: 893
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From: Buchanan, GA, USA
Status: offline 		Here is an approx. 45 sec. clip from the A123 side of the graph.i

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 6:22:37 PM   
guver


 

Posts: 8541
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From: LaGrange, OH, USA
Status: offline 		I see the minimum voltage is 7.5 and even at 45 amps that's not much of a voltage dip. The cells hold voltage real good. It looks like you are sampling every other second.

I really like that power recorder and will get one soon. Just another toy, lol.

< Message edited by U-dUd -- 11/23/2006 6:24:01 PM >

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 6:40:04 PM   
everydayflyer



Posts: 893
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		The sample rate is 4 per second and is listed in the Legend to the left of the graph.

The cells do hold voltage well and they supply 2000 mAh capacity before the bottom starts to drop out.

I need to brake down and get a Mamba Max BL setup as running these kinds of volts and amps is taking a toll on my brushed motor but then I just play with it in my yard anyway.


Charles

< Message edited by everydayflyer -- 11/23/2006 6:41:32 PM >

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 11/23/2006 6:58:14 PM   
guver


 

Posts: 8541
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		Ok, I see the sample rate, I misread the graph.

Definately a mamba. It's the best deal going right now.

15 turn motor is maxxed out at your voltage and won't last long, haha. I usually use 14 turns on about 10 volts max.

< Message edited by U-dUd -- 11/23/2006 6:59:40 PM >

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 12/24/2006 6:49:24 PM   
everydayflyer



Posts: 893
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		I broke down and got a CC Mamba Max 5700 . Man does this thing have an insane amount of power. I'm geared 14:87 for a top speed of close to 40 and have tached over 52K on the motor. 9 min. run times with the 3S A123 pack and 20 min. recharge times with my modified Astro Flight 109 LiPoly charger.

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 12/24/2006 7:35:21 PM   
guver


 

Posts: 8541
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Status: offline 		I think you should go to 4S and try it without a seperate bec.

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RE: A123 3 cell versus GP3300 6 cell in a Traxxas Rustler - 12/27/2006 3:58:42 PM   
everydayflyer



Posts: 893
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Well in that the ESC is rated for up to 12 cell nicads it would handle a 4S A123 without issue to the BEC and the 5700 motor should have no problems.

A 12 cell NiCad fresh off of charge is approx. 18 volts and would be approx. 14.4 under a moderate load . A 4 cell A123 is 14.4 fully charged but really 14V open withing 5 min. after charging and drops to 13.2 under a moderate load.

It is very common to use a 4S A123 inplace of a 3S LiPoly in many applications and I do so in some of my aircraft..

My problem would be that due to the fact my yard is not as smooth as a putting green the Truck becomes airborn often enough with just a 3S A123 and my reduced / speed limiting gearing..

Just completed run / charge #65. 9:26 run time / 2,260 mAh / 20:09 to recharge.

< Message edited by everydayflyer -- 12/27/2006 6:06:22 PM >

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