Batteries don't need to be plugged into a charger 24/7. They only need to be plugged in when NEEDING charging. The key is to monitor the voltage, and charge as necessary. Depending on your parasitic draw, it will determine the frequency. Fully charged, the voltage should be 12.6 or above.
Actually letting deep cycle batteries "cycle" a little bit (let the voltage drop some) before charging is OK for them.
I don't like leaving the rig plugged in 24/7. It's also energizing the complete 120 volt system, which doesn't need to be energized, unless you're using an appliance. Eliminates the accidental turn on of the water heater, etc.
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