"Philippe" wrote in message
news:1770438.ul5SB0L1ai@GastonCoute...
wrote:

I am putting two 12V batteries together
http://www.batterymart.com/p-hawker-...t-battery.html
to make a 24V battery.

What size cable should I use to make the serial connection?

Longer the cable, bigger the cable...
connect two batteries with a 1"cable: a 6AWG cable will work

flat copper bar will be better (less losses):
http://www.aircraftspruce.com/catalo...ges/busbar.php

by
--
Volem rien foutre al païs!
Philippe Vessaire Ò¿Ó¬
** Posted from http://www.teranews.com **

A copper bar would indeed work much better than a short cable. If you plan
to join two standard aircraft batteries sharing the same battery box, a
well-fitted copper bar is easier to install than a cable.

You can make a bar by flattening a short section of 1/2" thick-wall copper
tubing (as used for refrigeration lines) in a vise and drilling two 5/16"
holes the correct distance apart (about two inches I think, but you should
measure). Coat it with grease each time it's installed or it will corrode
rapidly.

Beech Barons use a similar copper bar, tin-plated as I recall. You could
buy one.