Asked
— Edited
going to buy a battery for a sabertooth. im going to get one with a mini Tamiya end and add the male plug to the sabertooth.
what is a good voltage for a sabertooth 2x12 running two 3A motors, each with a peak of 6A's?
if you find a good one please give a link.
Thanks,
Techno
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You are going about this backwards. You need to figure out how many volts and amps the motors take to run, then get a controller that will hande that load. It looks like you have the amps figured out. Most Sabertooth controllers have a wide range of voltage that they will cover, but it is the motors that determine what voltage you need to supply.
4 AA= 6v.
I don't know much about small batteries to recomend a particular one. I am sure that someone here can help you with that.
But, you answered your own question. 6Volts is what you will need.
a Sabertooth
that will work. It is a little pricey. You could probably find one cheaper. This one is regenreative. When you slow your car down, the braking energy is converted back into electricity that is fed back into your battery so that it doesn't run down as quickly.
It runs 6V to 18V. It can handle two motors running at 5 Amps each and peaks of up to 10 Amps. Your motors sound like they are within that range.
There are other motor controllers that are cheaper than Sabertooth. The important thing is to look at the specs (volts and amps). I wouldn't buy a real cheap one though. Well, I wouldn't do it again. I did that once, and got junk that didn't work. Shop around. Be smart about it.
www.dimensionengineering.com/products/sabertooth2x12
it will supply the motors with all they need and no more. plus I could reuse it with larger motors.
Yes bigger is better. You are correct about them not delivering more power than needed. You have to be careful about not applying too much voltage to a motor, but you can supply unlimited amperage. They will only pull what they need.
Just a side note; If these are the motors that you posted pictures of in another thread, they look awfuly small to draw that much current. I don't mean to question you, I just wonder if you should double check that.
http://www.lynxmotion.com/p-562-sabertooth-2x12-regenerative-dual-channel-motor-controller.aspx
79.99 , but if you sweet talk them they might hook you up. When I told them about the Jarvis project they discounted the controller 10 percent off and discount on express shipping too
Back to the topic in hand, I would also recommend the sabertooth 12x2 based on what I've read about it and the load you will require.
As Josh mentioned, look at 7.4v 2S LiPos, they are cheap, light and hold a lot of power. But then a fully charged 2S LiPo is 8.4V, can the motors handle that? (I'd guess yes but don't take my word for it).
You could regulate the LiPo to 6V but when I was looking for my regulator the ones i found were 5A which is below your peek (and running) current.