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ESC › What is maximum wire length from flight battery to ESC
04-27-2017 02:40 AM  13 months agoPost 1
RFCxPerT

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Texas

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I've heard you need to put some caps for every four inches away from the ESC. Is it really necessary as I have a total length of 24" or two ft from ESC to the 12S pack (2x 6S in series) with 10 gauge wire? I had multiple datalogs from CC 120A HV but did not bother to look for any unusual spikes. Do you guys notice anything degrading significantly by running a very long wire from battery to ESC without any capacitors?

Btw what is the typical wire size or gauge from the ESC to the 6S (and higher) motor?

Any suggestions is appreciated

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04-27-2017 05:49 AM  13 months agoPost 2
Pistol Pete

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Seffner, FL

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https://www.rcgroups.com/forums/sho...gth#post4833040
On the HV controllers especially, the battery-ESC length is the critical length. You should not extend the wires more than a total length of greater than 12" without additional capacitors.

On the motor side, length is less critical -- 18" is fine.

Patrick
Battery Ripple is the data to look at.

~~Enjoying the hobby one flight at a time~~

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04-27-2017 06:55 AM  13 months agoPost 3
EEngineer

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TX

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Are you sure?

A battery has no voltage ripple...like a power supply has.

I not buying into what was on that thread....with all due respect...

Have seen that argued back and forth...

Probably depends more on the ESC than a general "rule of thumb"...ESC's have come a long way since 2005....

Logo 600SXs, 800XX, TDR IIs

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04-27-2017 09:40 AM  13 months agoPost 4
DemetriusUSN

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Virginia Beach, Va USA

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I was always taught to make sure your wires aren't more than a foot long, total length. So make sure they are short as possible to connect your packs without any tension on the wires.

Minicopter Triabolo 700,Diabolo 800,Minicopter Diabolo 700, Minicopter 550,Compass 6hvu, Devil 380

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04-27-2017 02:29 PM  13 months agoPost 5
Pistol Pete

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Seffner, FL

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@EE

Feel free to debate it with "Patrick" del Castillo, owner-founder of Castle Creations and given I use his product, I will follow his "tested" recommendations.

Edited
Battery Ripple as explained by your new arch nemesis, Patrick
"Ripple voltage is a measure of the DIFFERENCE between the voltage of the battery during the "off" PWM time, and the "on" PWM time".
So batts with high internal resistance plus long wires affect the ESC and why the extra capacitors are recommended.

It may very well be an ESC design issue. I dont have the money, time, lab nor desire to debate a few inches of wire and its effect to the contrary.

~~Enjoying the hobby one flight at a time~~

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04-28-2017 04:08 AM  13 months agoPost 6
RFCxPerT

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Texas

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Where exactly the caps put on the battery wire?

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04-28-2017 04:10 AM  13 months agoPost 7
RFCxPerT

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Texas

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Never mind

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04-28-2017 04:24 AM  13 months agoPost 8
Pistol Pete

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Seffner, FL

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Caps as close as possible to ESC.

https://dzf8vqv24eqhg.cloudfront.ne...201606221536-71

http://support.castlecreations.com/wire-gauge-guide

~~Enjoying the hobby one flight at a time~~

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04-28-2017 04:28 AM  13 months agoPost 9
RFCxPerT

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Texas

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Thnx that really helps

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04-28-2017 06:38 AM  13 months agoPost 10
EEngineer

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TX

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"Ripple voltage is a measure of the DIFFERENCE between the voltage of the battery during the "off" PWM time, and the "on" PWM time"."

I misunderstood what you meant by "ripple"....

What type of capacitor does he recommend?

Logo 600SXs, 800XX, TDR IIs

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04-28-2017 06:51 AM  13 months agoPost 11
EEngineer

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TX

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Never mind on the cap....found it....thanks

Logo 600SXs, 800XX, TDR IIs

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04-29-2017 02:08 AM  13 months agoPost 12
RFCxPerT

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Texas

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The CC site shows much bigger wires than "their" wires on their ESCs? Interesting

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05-01-2017 01:27 PM  13 months agoPost 13
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

Our LIPO cells are very concern on voltage drop.

Each cell can manage only 0.5 volts, from 4.2 volts fully charged to 3.7 volts.

So, more wire mean more voltage drop.
More caps don't help.

More wire mean less flying time.
Each 1' means 0.1 volts less per cell.

Do your settings and by the time you check flying time, make adjustments on cut-off voltage.

http://www.calculator.net/voltage-d...es=60&x=96&y=16

Btw, fooling around with this calculator, you need 50' of wire to have no flying time.

/

Saludos cordiales,

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