So if I set the charger to charge Bulk at 14.9, the batteries should receive the 14.7 since the charger doesn't know better. I suppose the concern is that as the amps drop (absorption), the voltage will actually increase (because of less voltage drop on the cable) which is perhaps the issue I was missing as eventually at 10A it will be almost at the higher 14.9 voltage which is perhaps too high for the battery.The B2B I purchased ( DMT1230 ) does not have a dedicated sense wire. IE: You tell it what voltage to output and it compares that to the voltage at the B2B charger.
And the calcs you did on 10' is 2x the length I am using. I think you would need to enter 4.5' as the length on the calculator "* Please use one-way distance to the load. Not round trip distance.". Or am I missing something.... ? I assumed I could take total length and divide by 2.
If you were just using the 10' as an example, all good, but wanted to be clear that it is longer then what would be needed in our Westy assuming a mounting location around the sink.
I think I will stick with the 6AWG. Should be fine, especially after the revlation that as the amps taper off, the loss is less, and it will push the batteries up to the "correct" voltage by the time it's finished. Yes, some performance loss (which would translate into time to charge) vs a 2AWG cable, but doesn't seem worth it to me. But am happy to be convinced otherwise as I have not ordered the cable yet.