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Old Sep 29, 2012, 06:10 PM
Mecky is offline
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Using two ESC with two batteries on one motor!


I have two brushed speed controllers, each can only take a 3s lipo max, and 3s lipos go as far as 7V or 11V but I want to use 14V on the brushed motor so can I use two 7V 3s batteries with those two speed controllers to give the motor 14V?

My diagram,


Does it look good?

Also when I merge two ESCs in one RX do I have to cut one of the red wires and not use it from one ESC?

Last edited by Mecky; Sep 29, 2012 at 07:32 PM.
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Old Sep 29, 2012, 06:18 PM
aeromaniac is online now
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Glow 😡 no no no
Lol NO even if it would work your motor is still only seeing 3s in parallel, you need to wire your batteries in series to get 6s.
Old Sep 29, 2012, 06:31 PM
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Quote:
Originally Posted by aeromaniac View Post
Lol NO even if it would work your motor is still only seeing 3s in parallel, you need to wire your batteries in series to get 6s.
Are you sure it wouldn't give the motor 14V? Which is what I want.
Last edited by Mecky; Sep 29, 2012 at 06:42 PM.
Old Sep 29, 2012, 07:22 PM
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No, it absolutely will not give you 14V, only 7V
What is the voltage rating on the motor? 4S will probably kill the motor in short order.
Pete
Old Sep 29, 2012, 08:30 PM
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A 3S battery is 12.6 volts fully charged. If you attach them together in parallel, meaning pos to pos and neg to neg, it will still be 12.6volts.
If you join one pos from one battery to one neg from the other, then use the remaining pos and neg to the esc, you will have your batteries in series, now the two together deliver 25.4v.
As stated, you'll likely destroy your motor on 14v, but it should handle 3S ok.
Be careful, have fun. Doug Bartley
Old Sep 30, 2012, 04:08 AM
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Quote:
Originally Posted by Mecky View Post
I have two brushed speed controllers, each can only take a 3s lipo max, and 3s lipos go as far as 7V or 11V but I want to use 14V on the brushed motor so can I use two 7V 3s batteries with those two speed controllers to give the motor 14V?
No. Don't try it - something is bound to fry!
Quote:
Are you sure it wouldn't give the motor 14V? Which is what I want.
No. There is a back-feed through the throttle cables which are joined at the receiver. Therefore both battery negatives are connected together, and the total voltage is still only 7.4V.

Next problem is that the + output of one controller is connected to the - output of the other. When the ESCs turn on there will be a dead short between the two outputs. You risk blowing up an ESC and/or smoking the wiring.

You need a single controller which handles 4S, or stick with 3S and use a higher revving motor, bigger prop etc.

What is your current setup (motor, battery, prop) and what model is it powering? Why did you want to go to 4S?
Old Sep 30, 2012, 09:34 AM
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It doesn't matter if it is 7 volts, 12 volts or 14 volts. You cannot hook up the output of two ESCs in series or in parllel. If you do all you will have is major smoke from both ESCs.

Larry
Old Sep 30, 2012, 06:23 PM
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I see, I won't try it then, thanks guys!



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