Battery Powered Servo

Trains8989 · Jul 16, 2018

I am planning to use a separate servo for my Arrma Kraton and was wondering if I connected the red and black wires off a servo to a small 7.4-volt battery and having the other wire connected to the receiver. would it work normally or would there be complications?

Because I think that the white/yellow wire on most servos is the sensor/command wire (if you get what I mean), and the red and black are the power wires. that's what I am thinking this is.

2fast4u · Jul 16, 2018

Electrically that works. Run time may be an issue depending on your auxillary battery type & capacity. An external BEC may be a better option assuming higher voltage for your servo is the goal.

ThatDrewGuy · Jul 16, 2018

I'm curious how many people here use a BEC, and how much of a gain they have seen from it.

2fast4u · Jul 16, 2018

I run a Max 8 v3 and IMO 7.4v made the stock servo acceptable. Definitely makes a difference.

RCROD · Jul 16, 2018

I am NOT using an external BEC, a seperate servo battery, or even a glitch buster, and no problems to report, despite upgrading the servos in both my V3 Talion and Kraton. The specs on the Turnigy waterproof servo (TGY-WP23), that I put in my Kraton is 320oz.in torque/.12 seconds speed @ 6v, and very similar specs for the Hitec 7955TG, I put in my Talion. I was pleasantly surprised that the stock Arrma BEC seems to have sufficient enough power to handle both these upgraded servos. This was a bonus, as just one less thing to upgrade or go wrong. Also less weight, and possible wires to route, etc.

However, if you are using a HV (High Voltage) servo, or a servo with much faster speed and torque (over 400oz.in), you will probably need to use one of the above choices to help power it.

Trains8989 · Jul 16, 2018

I was planning to use this servo. but would a little 2s LiPo battery do the trick?

There is a waterproof version of this servo but this one is cheaper.

olds97_lss · Jul 17, 2018

Probably better off just going with a servo that runs well on 6V like @RCROD suggested:
https://hobbyking.com/en_us/turnigy...etal-gear-digital-servo-23kg-0-12sec-75g.html

$20 for a non-waterproof servo you have to wire weird and mount a secondary pack to run properly or $40 for a good one that has even better specs at 6V. When it's all said and done, can't be much better off cost wise dealing with the secondary pack.

Zaiden15 · Jul 18, 2018

The powerhd servo is slow imo. I bought one just to try and used it 2 packs before I took it out and replaced it with a Spektrum s6230. Loving it so far in my outcast.

chevys10zr2003 · Jul 18, 2018

In the thread below Motorider runs the servo directly from a battery and gives an explanation as to his reasoning. I cannot confirm nor deny any of what he says, but figured I would let you know about this thread.

https://www.arrmaforum.com/threads/servo-replacement.6065/

olds97_lss · Jul 18, 2018

chevys10zr2003 said:
In the thread below Motorider runs the servo directly from a battery and gives an explanation as to his reasoning. I cannot confirm nor deny any of what he says, but figured I would let you know about this thread.

https://www.arrmaforum.com/threads/servo-replacement.6065/

The relevant post from that thread:

Motorider said:
Actually, yes. I have learned from a large scale aircraft builder that servos will deliver better performance and last longer when directly powered off of a battery. This guy powers his servos in 5k to 20k airplanes with 2s lipo power. The power from a BEC is very dirty. Basically all it is, is a few FETs that are switched on and off very rapidly to give the effect of lower voltage output. BECs tend to get very dirty during peak amp draw. Voltage can sag and the square wave can get ugly. That can cause problems for the electronics onboard of the servos. A decent battery will eliminate all of those problems and should yield a long life for my servos.

The weight is negligable on the heavy kraton. I'm using a 2s 950 turnigy pack. Testing will tell me how much runtime I will get out of the rx pack.

Probably makes more sense to care that much when your spending $150+ on a servo.

Battery Powered Servo

Trains8989

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2fast4u

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ThatDrewGuy

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2fast4u

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RCROD

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Trains8989

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olds97_lss

Bash Break Repeat!

Zaiden15

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chevys10zr2003

Very Active Member

olds97_lss

Bash Break Repeat!

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