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Author Topic: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery  (Read 3366 times)

wee speug

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hi guys, can i run a brushless motor  off a nimh battery, or will i need a lipo
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kenthompson

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #1 on: April 01, 2014, 11:23:37 AM »

Hi Wee sprig yes you can. But. If you are doing brushless for better performance, why not go to Li Po as well,to get the better performance and efficiency?
Regards
Ken
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wee speug

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #2 on: April 01, 2014, 12:40:38 PM »

Thanks for the reply Ken....this will be my first venture down the brushless road,....and with only getting the boat with the brushless motor and esc....and no batteries,...i thought i could put all my nimh,s to good use,.....
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Netleyned

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #3 on: April 01, 2014, 12:47:46 PM »

Try it with the NiMH batteries first as you already have them.
Escs don't worry about the chemistry of the battery as long
as they are fed with the voltage and current they require.
If the speed or runtime is not to your liking then you can
venture into the sometime expensive world of the lipo

Ned
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sparkey

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #4 on: April 01, 2014, 01:23:15 PM »

 :-)) I have 3 boats running brushless with NiMH batteries at 14.4v no problems,I get long run times and good performance,sorry they are 7.2v in series x 5000 ma.,so you should be ok, best of luck and have a go you will well pleased,Ray. :-)) :-)) 
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inertia

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #5 on: April 01, 2014, 01:34:13 PM »

I'm sure that the reason why it's become accepted that you must use LiPo batteries with brushless motors is because 99% of them are fitted into model aeroplanes and helicopters. These need the lightest batteries available, hence they use LiPo packs. As regards available current, I doubt if many motors would ever take the maximum current that either type of pack can supply (unless stalled). It would likely melt the cables on the speed controller!
DM
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wee speug

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #6 on: April 01, 2014, 01:52:00 PM »

thankyou all for the positive input....and..my Scottish pocket says thanks as well {-)
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Peter

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #7 on: April 01, 2014, 03:13:07 PM »

Keep your Scottish pockets under lock and key, your existing batteries will be fine.

Peter
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Netleyned

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #8 on: April 01, 2014, 03:18:45 PM »

Aye
Keep yer ponnys in yer pooch. :-)) :-)) :-))

Ned
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andra

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #9 on: April 01, 2014, 03:29:34 PM »

Yes you can!Electrons are electrons are electrons so you can feed those beasts with whatever kind of cells or batteries you have handy, providing of course that they can supply suitable volts to give you the motor revs that you desire to suit the prop that you are using and performance that you want :D

I love brushless motors myself, they are superior in efficiency, smaller in size and lighter in weight than the same brushed jobby of equivalent power...I am retrofitting a few of my boats with brushless.

Andy
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wee speug

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #10 on: April 02, 2014, 01:31:50 AM »

i,ve heard that some brushless don,t have reverse...is this true....cos if it is then i doubt if i,ll be using them...cos, more often than not.its my best way of avoiding the pond wall {-)
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kenthompson

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #11 on: April 02, 2014, 06:36:01 AM »

Hi wee speug. That is correct, just make sure you read the spec,s before you buy. And stay away from the wall,lol.
Cheers
Ken
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essex2visuvesi

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Re: Can i run a brushless motor and esc, off a 7.2v or an 8.4 battery
« Reply #12 on: April 02, 2014, 07:04:49 AM »

Quite a few brushless speed controllers with reverse have a set able reverse limit so you can reduce the top max speed in reverse. This can prevent submarining.
As others have said it makes no difference what you use to power a brushless motor as long as the voltage is correct and can handle the current draw. This is mor an issue with high performance motors
The main reason people use lipos over others is weight and efficiency, a comparable lipo is quite a bit lighter than an equivalent Nimh or Nicad.
Lipos do however come with their own limitations and considerations
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