Originally Posted by teneicm
Humming along nicely now.... still have about a .5 volt drop from the battery measurement, but some of that is from the batteries to the main distribution bus.
Thanks for the help.
Well done in solving the problem.
The 0.5v should be fine. You need to remember the predicted 0.25V is for the wire only. There are lots of connections (wire to ring terminal, ring terminal to switch etc) in the system as well as voltage drop for the CB (or fuse) main battery switch etc. All these have some voltage drop.
The end result is if you measure less than 0.5v drop, the system is pretty good.
There are some proponents of connecting the fridge to the batteries. This would reduce your voltage drop to 0.35-0.4v, as well as provide a slightly more stable supply, but in my opinion conventional connection, or at least after the main battery switches is better.