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HomeOff Topics › LIPO Batteries in Racecar
12-27-2010 01:45 PM  7 years agoPost 1
RobMcQuillen

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Rochester, NY

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What do you guys think about the idea to run 3 or 4- 4s 5000mAh 35c In parallel to power a 16v setup?

Batteries could have balancers such as the Astro blinky balancers on them at all times.

Even contained in a metal box the weight would be dramatically decreased from a regular battery.

Rob

Rob McQuillen

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12-27-2010 03:00 PM  7 years agoPost 2
Flying Brian

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St. Clairsville, Ohio

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Yeah, if you have the proper esc and radio equipment to handle this amount. Whats up with the Astro Blinkys? You don't use them during operation, or am I misunderstanding you about this?

Go hear:
http://www.teamnovak.com/

"I just don't Listen" "

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12-27-2010 04:08 PM  7 years agoPost 3
SuperSixTwo

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Virginia City, NV ---USA

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I think he means full sized car. Would work fine as long as you dont crank against it. Most starters draw a huge amount on the initial pull. I wouldnt run an alternator either, just cause of the charging curve of the lipos.

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12-27-2010 05:22 PM  7 years agoPost 4
RobMcQuillen

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Rochester, NY

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I'm talking about a Full Size Racecar.
Just a few further questions...
Astro Blinkys? You don't use them during operation, or am I misunderstanding you about this?
I was planning on using some sort of balancer to keep the packs in check while being charged by the alternator. Do you know of any balancers I could do this with?
I wouldnt run an alternator either, just cause of the charging curve of the lipos.
Why do you think It would be a problem?

Thanks for the quick responce!

Rob

Rob McQuillen

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12-27-2010 07:40 PM  7 years agoPost 5
SuperSixTwo

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Virginia City, NV ---USA

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Alternators dont have any "smarts" about them for charging. Most lipo chargers wont over charge unless you select the wrong type of pack. (more cells than you really have)
I have never used blinky balancers, so i dont know what they would do for you. I would think you need to control the current and voltage going to the batterys, like a charger does.

Kinda long way of doing it, but how about feeding the lipo charger with the alternater output, regulating it with a small sealed lead acid battery (like in a field box)?

With 4s do you need an alternator for the race? I never ran them on the circle track car i had, but then again, i never won a race either! And that was many many many years ago.

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12-27-2010 07:50 PM  7 years agoPost 6
RobMcQuillen

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Rochester, NY

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This is going in my dads drag car thats also going to be street driven here and there. So a alternator is required. What do you think would happened if we put the lipos in as a direct replacement for the normal car battery?

Rob

Rob McQuillen

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12-27-2010 08:54 PM  7 years agoPost 7
SuperSixTwo

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Virginia City, NV ---USA

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Well, provided that the start draw doesn't puff them (get a high c rating and enough mAh to cover it) and your alternator doesn't over charge them, you should be fine. Get an aluminum battery box.

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12-27-2010 08:55 PM  7 years agoPost 8
jcrack_corn

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End of Time

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What do you think would happened if we put the lipos in as a direct replacement for the normal car battery?
boom.

------------------------------------------------------------------
do it inverted
------------

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12-27-2010 10:04 PM  7 years agoPost 9
mmc205

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PA - USA

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i've heard of folks using a123's in a 4S configuration for a replacement of tractor/quadrunner batteries. I believe it was 4s2p for a 12 volts replacement. A123's are more robust, can be charged with an alternator (as long as the max alternator voltage isn't larger than the max charged voltage of teh pack) and don't mind having huge discharge amps without being hurt, and also huge charge amps.

they are 3.3v nominal, 3.7 v fully charged
http://www.a123systems.com/a123/products

i think they can be pulsed at 50C or more (120A) so for your app, a 5s3p would give you 16.5v nominal, 19v max charge, 210A continuous discharge, and 360 amp 10 second pulse all for about 37 ounces!

some guys at rcgroups even "zip" charge them, that is basically hook them striaght up to a deep cycle battery for charge times of about 4 minutes!!!

With all this, they seem to last to hundreds of cycles if not more

***Logo 600 vbar***Henseleit TDR vbar***

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12-27-2010 10:05 PM  7 years agoPost 10
mmc205

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PA - USA

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check this out too, this runs on a123s
http://www.killacycle.com/

***Logo 600 vbar***Henseleit TDR vbar***

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12-29-2010 03:57 PM  7 years agoPost 11
Gyronut

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Martinsville In.

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Why not use a pull starter or a crank..

Seriously though, your profile suggests you have lipo knowledge but your acting like these things behave like dry cells or something...

Why do you think they have lipo specific chargers..??

People burn their houses and cars because they dont follow reccommended chargeing procedures...

Sorry to be a jerk...

Rick

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12-29-2010 07:12 PM  7 years agoPost 12
RobMcQuillen

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Rochester, NY

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Gyronut, we all need some of that sometimes to keep us in line
On a serious note, it sounds like you know what your talking about so what about this.

A 4s3p pack. 3- 4s 5000mAh 35c in parael. Capable of producing 1050a max burst for 15 seconds or so. Possible hooked up to balacers that could balance the cells during normal use. All put together in an aluminum box that would be mounted in the front of the car because of the lightness. Charging this system would be an adjustable voltage output alternator set to 16.6 or 16.7.
The batteries could be balance charge from a lipo charger after use after a certain amount of time. What do you think?
please excuse the spelling, sent from a mobile device.

Rob

Rob McQuillen

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12-29-2010 07:17 PM  7 years agoPost 13
Ronald Thomas

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Gainesville, Fl, USA

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The charging of the lipos is the issue. I say charge them outside the car, reinstall and run. Then you can use lipo safe charging and not burn the car to the ground

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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12-29-2010 08:12 PM  7 years agoPost 14
mmc205

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PA - USA

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or use a123's they arn't quite as light, but very robust and require almost no charging routine. straight off an alternator would be fine.

***Logo 600 vbar***Henseleit TDR vbar***

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