Servo amps & voltages ... specific questions

[Locked Up]

I know how many volts I'm running to my servos because I have my CC BEC set to 6.6v ... but what about amps? About 2?

Also, can someone tell me about how many volts & amps get pushed to a typical servo motor (litle on inside the servo itself)?

Ball park figures will work for this...

[jevyguy]

It all depends on how many volts your battery pack is. The higher the voltage the lower the output amps on the bec. You should be getting more than 3 amps to your sevos even if your current setup uses a 3-cell li-po. Usually you don't want to go much over 6 volts on the servos, and 2 servos should use (in the neighborhood of) about 3 amps. Someone correct me if I wrong please.

[Locked Up]

Originally Posted by jevyguy

It all depends on how many volts your battery pack is. The higher the voltage the lower the output amps on the bec. You should be getting more than 3 amps to your sevos even if your current setup uses a 3-cell li-po. Usually you don't want to go much over 6 volts on the servos, and 2 servos should use (in the neighborhood of) about 3 amps. Someone correct me if I wrong please.

I was thinking each servo pulled about 2a ... or 4a for two of them... so I guess we are in the same ballpark.

My batteries are mostly 8.4v, but I do have one 9.6v.


Any idea what the little motors inside draw?

[Grizzly4x4]

Originally Posted by Locked Up

I know how many volts I'm running to my servos because I have my CC BEC set to 6.6v ... but what about amps? About 2?

Also, can someone tell me about how many volts & amps get pushed to a typical servo motor (litle on inside the servo itself)?

Ball park figures will work for this...

Amps don't get pushed to the servos (or any other electrical device), the servos draw amps from the battery. Amperage draw is dependent on the load, a servo on a rig sitting still will have very little draw while a servo trying to turn the tires on the rocks will draw full amperage.

A Hitec 5645 digital servo can draw 4 amps at max load. A weaker digital or an analog servo usually draws a little less. Most servo manufacturers don't post info on amp draw.

[Grizzly4x4]

Originally Posted by Locked Up

I was thinking each servo pulled about 2a ... or 4a for two of them... so I guess we are in the same ballpark.

My batteries are mostly 8.4v, but I do have one 9.6v.


Any idea what the little motors inside draw?

2-3 amps is prolly pretty close for a servo like a Hitec 645mg.
Hitec servos can handle 7.2V but I think it shortens the life. Don't keep the steering turned at full lock for a long time if they are at 7.2V, that'll burn em up.

[Locked Up]

yeah I realized I said pushed after I typed it. Nobody is perfect



I'm not running Hitec servos, I'm using Tower Pro 945/6s mostly. So about 4a (or less) is a max load for a mid sized servo like those ... excellent.


Now if I can just figure out the draw on the little motors I'll be set. I've been looking around for reaplcement motors to see if I could find specs but I haven't found any yet.