This place sells Xantrex and Ames. I have an Ames 300 watt sine wave inverter.
http://www.invertersrus.com/puresinewaveinverters.html
Set up your battery bank as 24v for those inverters.
The starting loads are much higher than the run loads for fridges, so you might consider getting the 3000 watt model.
But consider that those power ratings a fair amount of power is used by the inverter at idle. You'll probably need some grid based trickle charging to keep from running down the batteries on cloudy days and at night. That site also sells battery chargers.
