For any RV application, and incorporating a power inverter, here's the deal. The panel(s) themselves will not power an inverter, however, you can have the panels and inverter connected to the 12v battery at the same time. In this instance, the battery is charging at a constant rate from the panels, and the inverter, or anything else hooked up simply uses the stored energy in the battery. I'd recommend at least 30 watts of solar power if you plan on using a power inverter. Basically 30 watts of solar power can put 10 amp hours back into a battery each day. Use this easy math to figure things out. 1 amp hour is the same as what it would take to power a 100 watt bulb for 1 hour. If you look at your electronics, the watt rating for each can be found stamped, or stickered on somewhere, sometimes on the transformer that plugs into the outlet. Phone chargers, and such use very little power, but if you want to run a blender through an inverter, they typically need 350 watts, so if you ran it for 1 hour, it would use 3.5 amp hours from the battery. Remember too that power inverters use a bit of energy while powered on, so always turn them off when not needed to preserve your battery.