Solar install in the RGV?

We are part timers, snowbirds mostly. I think that I want 500+ watts of panel to help charge our batteries during the day. We have a diesel generator that I don't mind running a little. This solar charging would be to keep from running the generator so much and keeping the noise factor down to a minimum. We presently have 6 12v batteries and a 1500 watt inverter. We do have a residential refrigerator, it is an energy star model. Sitting here at home with a kill-a-watt meter on the power line I'm using around one kilowatt hour/24 hour period for the whole motorhome. I want to add solar for winter boondocking in the desert southwest. We have a propane heater which is sufficient heat for us that doesn't require any electricity. We won't be using any microwave, toaster, water heater, or coffee pot off of the inverter. Thanks.

dreamer.