Thanks everybody for confirming what I told him.
Walk Away from CW!
we did a walk through on his daily usage In Ah - and we figured - conservatively - that he's going to use about 100ah a day (he's got parasitic draw of 2ah constantly - which seems high).
we did the calculations for water pump, furnace, lights, ceiling fans, everything we could throw in and that's were we started out.
We figure we need about 400Ah of capacity - using 50% of the capacity each day.
GC's are the way to go - and he's going to get me his current charger model number (i'll bet it's a WFCO).
The alternative is to use an exernal battery charger (3 stage).
He's looking at FLA's, AGM and LI batteries (but I know he'll opt for the FLA's).
He doesn't live in it off grid, it's mostly weekend and vacation.
He already has his Generators (the 5er has a Yamaha built in and two 2200w hondas). Financially it just doesn't make sense - even if the cost of fuel is 5.00 a gallon. his ROI is just not there.