A 55 amp converter will keep 2 group 24 batteries charged nicely (standard on the 19CCD0. If you go for ....say 4, I might upgrade to a 75amp model. Also, consider using AGM batteries. They are sealed and can be used in any orientation and are especially suited for indoor use as they do not gas and require less ventilation than liquid filled types.
Solar Tech Energy Systems, Inc.
Victron Solar Components and Inverters, Zamp Solar Panels, LiFeBlue and Battle Born Lithium Batteries, Lifeline AGM Batteries