Chief Delphi - voltage loss over long runs

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Re: voltage loss over long runs

Quote:

Originally Posted by GeeTwo (Post 1445655)

This falls under the heading of sprawl.

Or you get a number using 30' and divide by 5 or 10 - you get a better number for the shorter run that way.

Re: voltage loss over long runs

Quote:

Originally Posted by wireties (Post 1445737)

Or you get a number using 30' and divide by 5 or 10 - you get a better number for the shorter run that way.

?:confused:?

Re: voltage loss over long runs

Quote:

Originally Posted by GeeTwo (Post 1445754)

?:confused:?

The relationship of the effect on a longer run scales (almost linearly) to a shorter run - not true? Impedance per unit length is a key component of the equation, correct?

Re: voltage loss over long runs

Quote:

Originally Posted by rich2202 (Post 1445588)

Not tall, but go look at Team 148 (batman thread). They have a 30 foot or longer tether. Drive wheels are on the robot with the battery, but the tethered piece has motors for lift.

Quote:

Originally Posted by GeeTwo (Post 1445655)

This falls under the heading of sprawl.

Quote:

Originally Posted by wireties (Post 1445737)

Or you get a number using 30' and divide by 5 or 10 - you get a better number for the shorter run that way.

Quote:

Originally Posted by GeeTwo (Post 1445754)

?:confused:?

Quote:

Originally Posted by wireties (Post 1445768)

The relationship of the effect on a longer run scales (almost linearly) to a shorter run - not true? Impedance per unit length is a key component of the equation, correct?

This is true, and I wasn't arguing that it wasn't. I was just having difficulty parsing your earlier quote, and especially how that might not mean that the Batman and Robin tether was a case of sprawl.

Re: voltage loss over long runs

Quote:

Originally Posted by GeeTwo (Post 1445786)

No worries, several different contexts here I reckon - your OP used 3' and 6' as examples thus the 5 and 10 divisor.

Re: voltage loss over long runs

Coming back and reading this thread I can't help but laugh at the fact that 1296 ended up having a tethered bot.

Re: voltage loss over long runs

I get teased about it quite often. ;o)

Re: voltage loss over long runs

With some of the long wire runs we are seeing this year, you may also want to watch out for the weight of your wiring. We have been through multiple cycles of weight reduction and I have concluded that we could have laid out our electronics better and dropped some excess weight. I used a kitchen scale and found that 18 feet of 12AWG wire weighed 0.494 pounds. That was about how much wire we would have needed to add a pair of motors up front for an active intake mechanism.