The MARINCO 3% Voltage Drop AWG Calculator . . is sobering.
A 40’ distance (80’ circuit) where
25A maximum current draw per spec
requires 1-AWG
Sobering, as ANCOR 1-AWG is
$375.00 at 100’.
Then, ANCOR lugs & terminations.
There may be cheaper than ANCOR (USCG spec) in tinned marine-grade wiring products,
but not by a helluva lot.
Flame or UV-Resistant split loom by same, also.
Anderson PowerPole disconnects.
Last year I had over $200 into a shorter run just for the wire. The needed accessories drove it up AND the calcs needed for losses per fuses, etc.
Take your time.
I console myself that with a travel trailer, there’s just no such thing as having “too much” HD wiring.
Radio is good excuse to re-consider the whole of a mobile (portable) system. Installed, or waiting for connection in the field. (My CTD Dodge can use some upgrades; PP connectors either end of my radio power cable can be used ALSO to charge the trailer batteries, etc).
I found that a 14” waxed cotton Dutch Oven carrier (Amazon) can carry over 30’ of prepared 2-AWG.
A Bucket Boss jumper cable bag for runs of smaller gauge.
How you will transport and store it otherwise is itself a subject. Less prone to heart-attack surprises. An easier place to start (all the field gear).
.
