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Old 12-02-2015, 08:00 AM   #1
Thunder Chicken
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Long battery leads

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So i've ran into a problem with my Twin Otter build and have to place the batteries in the fuselage, rather than the wing/engine nacelle. This will require fairly long battery leads.
I've read that I could also have longer motor leads.
With the addition of capacitors to the ESC end of the battery leads it should be possible to extend them. (24"-30"). However one potential problem is.....with the servos in the wing and the extensions running to a common point, the battery leads would also be running near these servo extensions. There is no way to separate them more than an inch or two.
I guess without testing it theres no way to know for sure what won't work.
As far as any interference goes, would it matter if the motor leads were that close to the servo extensions vs the long battery leads? (with the added caps?)

The batteries are 5s 5000mah, running on 80A ESC's. I'd make the battery leads from 12g or 10g. wire. Servos are all savox mini digitals, extensions are homemade twisted servo wire, 22g i believe, radio is a 2.4 Airtronics.
Thanks for any insight!
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Old 12-02-2015, 04:49 PM   #2
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Re: Long battery leads

Long battery leads can burn out an esc faster. I have used up to a foot long battery lead but on small motors and batteries.
It is better to have longer motor wires. What I do is I braid my motor wire extensions to remove interference. Hardest/longest part is soldering all the bullet connectors, but you will be able to run them near servo leads without issues
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Old 12-02-2015, 05:03 PM   #3
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Re: Long battery leads

I have my Twin Otter set up with telemetry to monitor both batteries per cell voltage. This setup required running a parallel setup. Since it was previously set up with batteries in the nacelles it was a toss-up electrical wise to run parallel wiring or single battery in the fuse. Would have taken much construction to add battery access hatch in the fuse.

The result is the battery wires are about the same length as I ran in the 182 (something like 18 inches). With that setup I logged the voltage ripple on the Castle ESC and it was something like 5% of the max ripple Castle recommends before needing to add capacitors.

I decided to put one extra cap on each ESC anyway.

Absolutely no issues with any radio/servo interference.

It's the 81 inch H9 Twin Otter.

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Old 12-02-2015, 05:15 PM   #4
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Re: Long battery leads

I knew this had been discussed before. Ron has some great links for lots of info.

If you can't be kind, at least have the decency to be vague.
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Old 12-02-2015, 07:52 PM   #5
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Re: Long battery leads

Originally Posted by Thunder Chicken View Post
As far as any interference goes, would it matter if the motor leads were that close to the servo extensions vs the long battery leads? (with the added caps
Another option is to go with shielded 22gauge cable for the servos, you can get it by the foot with any number of wires.
RV-8'ting and loving it!!
**Trout Farm Flyers**
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