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Old Dec 04, 2009, 08:55 PM
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wire gauge on 6s3p at 10A?

Hi all...

this is a super thread, and thanks again to Julez for this and helping me fix my semi-fried 106b the other day. I'm working with 6s 3000mah and 6s 5000mah batteries for helis, planning to charge them in parallel (different capcities separately), say 2-3 at a time.

questions:
-if I have 10 of the 6s extensions from Hobby city, should I just solder say 3 of them together and plug them directly into the 6s port on the 106b? If someone has the most current link to US sources for jxt taps/plugs and the perf board, I might give that a whirl instead

-If I run the 106B full out (10A) what kind of wire gauge do I need for the main charging wires? is 16ga good enough? (electronic newb)

-what is the upper limit of the number of these cells I can charge in parallel? I have 5 of each type.

thanks!

Ben
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Old Dec 05, 2009, 02:34 AM
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Quote:
Originally Posted by skinnydoc View Post
-if I have 10 of the 6s extensions from Hobby city, should I just solder say 3 of them together and plug them directly into the 6s port on the 106b?
That will work perfectly.

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Originally Posted by skinnydoc View Post
If someone has the most current link to US sources for jxt taps/plugs and the perf board, I might give that a whirl instead
Where I buy my stuff:
JST-XH from Digikey. Navigate to P. 141

Perfboard from All Electronics.

Quote:
Originally Posted by skinnydoc View Post
-If I run the 106B full out (10A) what kind of wire gauge do I need for the main charging wires? is 16ga good enough? (electronic newb)
16 gauge is more than enough unless your charge leads are ridiculously long. With 1' leads, you'll be dropping less than .1 volt in the leads.

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-what is the upper limit of the number of these cells I can charge in parallel? I have 5 of each type.
There is no theoretical upper limit. I routinely balance charge 11 packs at a time on one of my 2S adapters at full 10 amp output of my 106B.

Mark
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Old Dec 05, 2009, 03:43 AM
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Quote:
charge them in parallel (different capcities separately)
No need to charge different capacities separately. You can mix them as you like; the cell number has to be equal.
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Old Dec 05, 2009, 08:31 AM
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It's easy enough to get 12ga noodle wire (high strand-count with silicone insulation = very durable and flexible) so that's what I use for all my main power leads on charges and packs. 16ga might be OK for 10A but why waste volts/watts in the lead and who knows, you might use the same lead on a 20A charger sooner than you think! I would recommend 12ga.
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Old Dec 05, 2009, 11:08 AM
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Understand what you're saying Ken but in reality the power loss difference between 12 gauge and 16 gauge in 1' charge leads at 10A is less than 1/2 watt. When charging a 5S pack at over 200 watts, 1/2 watt additional loss is completely negligible. Even at 20A the power loss delta is less than 2 watts in a 1 foot charge lead. As such, if one already has 16 gauge charge leads of reasonable length, there's no need to replace them. If making/buying new leads, consider 12 or 14 gauge for durability advantage.

Mark
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Old Dec 05, 2009, 11:29 AM
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I use the foam cutter mode on my iChargers to determine if a cable size is up for the task.

I set the foam cutting current to the level I intend to charge with, and put the cable in place of the cutting wire. If it gets more than just luke warm, use a bigger size.
Set the current to 20A, and the charge cable will always work well.
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Old Dec 12, 2009, 12:48 PM
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Quote:
Originally Posted by skinnydoc View Post
-if I have 10 of the 6s extensions from Hobby city, should I just solder say 3 of them together and plug them directly into the 6s port on the 106b?
So am I right in assuming the 106b balance outputs are JST-XH type then?
I'm going to order this charger and want to get some compatible connectors at the same time. I reckoned they were JST-XH but haven't seen it clearly stated anywhere.

Aidan
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Old Dec 12, 2009, 12:57 PM
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So am I right in assuming the 106b balance outputs are JST-XH type then?
Absolutely correct.

Mark
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Old Dec 12, 2009, 02:17 PM
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nice, thread. I am making a connector to charge my 6 3s 1300mah packs. all are prtty new, no more then 20 flights. I bought the 10 pack of 3s extensions from HC and I just got done soldering them all together in parrellal. I just did the 6 blacks together, 6 yellows, 6 blues, 6 reds together. my charger can handle the current, but it charges through the balance taps only, so is 8+ amps through the balance plug to much to handle for those small wires?
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Old Dec 12, 2009, 02:59 PM
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so is 8+ amps through the balance plug too much to handle for those small wires?
Yes. Most recommend 4 amps max through a balance tap. Curiously, what charger to you own? And it can provide 8 amps of charge current through the balance taps???

Mark
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Old Dec 12, 2009, 05:38 PM
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I have an imax bc8 charger from HC. I checked and its rated at 7 amps, but no difference. I didn't like the balancer it had so I bought this: http://www.helidirect.com/equinox-li...cer-p-4813.hdx

it charges through the balancer port. do you think 7 amps and less is OK for the balancerer wires?
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Old Dec 12, 2009, 05:51 PM
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Un-modified I would not run more than 4 amps through an Equinox. With the high current mod, I've run 10 amps through an LBA6 which is basically identical to an Equinox. So, 7 amps - I certainly wouldn't unless modified to use main charge leads to provide charge current.

Mark
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Old Dec 12, 2009, 05:56 PM
Trex 450 V2, Spektrum.
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how would you do that mod? do you have a link?

I can use the charger and charge all my packs in parrallel without balancing, but I dont really want to do that.
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Old Dec 12, 2009, 06:02 PM
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Will dig up high current mod when near a computer (on Blackberry now) if others don't provide in the interim.


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Old Dec 12, 2009, 06:06 PM
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cool, thanks alot!
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