Good point, Jeff. Thanks. I'm quite familiar with 120 through 480 volt
drops, but it's nice to be reminded how dramatic 12v drops can be.
Padeen


"Jeff" wrote in message
...
Roger Long wrote:
That's an excellent point. Exactly the kind of insight that prompted
my post.

The cables in this case are about half an inch in diameter and three
feet long. With just 10 amps of charging current per group 24 battery
I agree that it won't be a problem. I cleaned up the battery
connections bright and shiny when I put the batteries in and I'll do
the other connections when I install the charger.

I'm glad you understand the significance of this issue, and it sounds
like you won't have a problem. Single 0 (1/0) cable should handle 10
Amps for over 100 feet with less than a 2% drop.

However, readers should be aware that a 100 Amp current will have a 2%
voltage drop in 10 feet of single 0, and 14 feet of double 0. this
will be a few tenths of a volt, enough to give a distorted reading of
the charge state.

In my case I have both a 100 Amp alternator and a 100 Amp shore
charger. The shore charger is about 3 feet of 2/0 away, but the
alternator is 15 feet. The next time I running it with a high rate
I'll have to test the battery post voltage so see if its running
higher than expected.