Parallel Adapter Question

[srislash]

Now I know where these redundant posts are coming from, the site freezes up!

You to eh? Haha

[R2315]

Alright, I gave it another go. Although I don't have #8 on the mains it still should work a little better.

20170923_194837.jpg20170923_202444.jpg

[CraigP]

That's nice! The #8 would be for max amp transfer. If your racing, then you want all the amps you can get to reach the ESC with the least loss. I use #10 to #10 branches when I want a squeeze point, to force even current sharing. But the branch outlet wire is much shorter the the two infeed wires.

[CraigP]

Here's some wire specs that may be helpful:

#10, high stand count silicone jacketed wire (Castle Creations) has a resistance of 0.0010 ohms/ft at 50 degrees C, or about 122 degrees F. If your wire is any hotter than that then you need to address that. This is also increasing the ampacity by 15%, due to the high strand count, which offsets the skin effect.

The wire is 0.0000835 ohms/in, which is the unit our boats should be calculated at.

#8, high stand count silicone jacketed wire (Castle Creations) has a resistance of 0.000597 ohms/ft at 50 degrees C, or about 122 degrees F.

The wire is 0.0000497 ohms/in, which is the unit our boats should be calculated at.

As you can see, the #8 is about half the resistance of the #10. So how do you use this? Example using R2315's wire harness:

The resistance of the parallel branches are 3*.0000835=0.00025ohms. The two are in parallel, so the two wires have a combined resistance of 0.00025/2=.0.000125 ohms. The single wire is 0.00025 ohms and the whole harness is 0.00025+0.000125=0.000375, or 0.375milliohms. You have to two runs, plus and minus, so the
total is 2*0.375milliohm=0.75milliohm.

This should run nice and cool. Assuming an overall length of 6".

Note: edited

[R2315]

Thanks Craig! very helpful indeed, it's always good to see and have the math to back things up. turns out it's pretty much exactly 6" from bullet to bullet. I'm not doing any racing with this, more to help ensure even battery draw.

Thanks again!