What battery pack for 21 MG996R servos

Other Hardware Motors, Mechanics, Power and CNC
1

Hi,

i have a project with a battery question. I like programming but lack the required knowledge when it comes to power and batteries.

i have a project that requiers 21 servos MG996R. As it will be a moving remote controlled project, it has to be battery powered. The project will weigh about 4kg without the batteries for the servos. The arduino and motorshield (USC-32) have a separate battery to power themselves which are included in the 4kg. The project will 'carry' itself as it moves. No other weight will be added (except the weight of the requiered batteries for the servos).

When it moves, it will only use about 12 servos at a time.

The mG996R uses 4.8-6.6v, has a stall torque: 9.4kg/cm (4.8v); 11kg/cm (6.0v) at which it draws 1400ma. At a no load operating, the current draw is 170mA.

What battery packs would you advice me to use and how much operating time would you guess this project would have with such a pack?

Thank you all!

2

I'd advise an umbilical, until you've determined actual operating loads.

3

+1

The start/stall current of the MG996R is 2.5 A, and the power supply has to be able to supply at least 21X that, so at minimum 55 Amperes.

Plan on a 6V, 300 Watt power supply. Any less and your project will become an amazing display of spastic behavior.

4

I will follow this advice. I don't think the project will need the amount of power mentioned in the other post, but if i purchase a powersupply, why not go all that way. Thank you both for the help!

5

Lots of beginners think that, until they experience the failures first hand.

6

The manufacturer's spec https://www.towerpro.com.tw/product/mg996r/ says the stall current is 1.4A as the OP mention in the original post. So a 30A supply would almost certainly suffice. OTOH more current capability is never a problem.

Steve

7

This one clearly states 2.5 A stall current: PiBorg | MG996R - 180 degree metal gear servo

Of course there are many, many MG996R fakes, so who knows?

8

You'll see when you try to attach them all at the same time! :grimacing:

9

Indeed. But i will buy a power supply up to 60A. The price isn't that much different than a 30A and a heavier power supply is always handy to have around :slight_smile:

10

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.