You might want to consider the ABYC recommendation which limits the battery
cable run length between your battery(s) and the circuit breaker.. I don't
have the ABYC stuff on this computer but I seem to remember it is only about
12 or so.

Since that didn't work for my installation, I found that I could get around
that requirement by putting the cables in conduit unit I they reach a more
convient location about 30" away. This is where I installed my main fuse (I
think it is 500 amp) and disconnect switch.

(If someone has ABYC handy, please confirm these distance recommendations)

Steve
s/v Good Intentions