Originally Posted by HarryStone
Every inch you add to the length of your cable run, reduces the available voltage at the end of the run.
The voltage drop over 1 foot of 2-0 cable, AT 200 amps, is .030 volts. At 100 amps its only .020 volts.
12.6 volts at the battery leaves you 12.569 volts, a foot away. My meter would round that up to 12.6 volts.
Hardly anything to worry about.