We have 2 of these fans and they work fine. They now have the 12VDC plug. They use less than 1 amp each (around 9Ah each over night). Using 110VAC fans is not going to help your batteries as the inverter uses battery power to convert from 110VAC down to 12VDC, stick with 12VDC fans, batteries will last longer.
Not sure as to what your battery situation is, but if you have 2 batteries the 12Volt fans will not kill the batteries.
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329