rparigor@suffolk.lib.ny.us wrote:
> Your math is fuzzy.
Well, show me a better math then.
> Eric Jones does in fact speak all about the fact that resistance of #4
Eric Jones is the guy that sells the stuff, and ommitted the
ohms-per-feet figures in the pdf... He compares cables with the same
diameter, doesn't talk about voltage drop, while the interesting thing
is to compare two cables with the same voltage drop (over the same
length and with equal amount of amperes) and THEN do the weighing.
> I saved a pound:
No, you didn't. At least not if you compare it with copper wire with the
SAME RESISTANCE as your CCA wire (instead of the same diameter).
Hey, I know a great way to save even more weight: Buy my special teflon
#4 cable, absolutely metal-free! It weighs 5% of the copper cable with
the same diameter! Now that's a real bargain! ;-)
> #6 wire especially with an aft battery will be marginal at best. Your .5
> volt drop may be running the panel but when you crank 50 plus amps it
> will be far greater.
Well, #6 copper wire has a lower voltage drop than your #4 CCA wire. If
#6 wire is marginal, #4 CCA wire is sub-marginal. ;-)
> Redo your math.
Now show me the ohms-per-feet of copper, and the ohms-per-feet of
aluminium. Then we can do a trivial calculation, where we compare the
weight of aluminium and copper WITH THE SAME VOLTAGE DROP (which is
entirely different than the comparison of two cables of equal diameter.
;-) )
Granted, there is a little weight saved, but it is nowhere near 45% as
they claimed.
--
Frans Veldman
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