The problem with generators is that most CGs with quiet times don't like them on past some hour (usually 10 or 11pm). Hopefully you are in the bedroom by that time and don't need the 110v television any more and will run exclusively off the 12v batteries. If not using a generator, adding more coach batteres (another one or two 12v or equivalent) will extend your power to satisfy one or two nights "off the grid". This is where 6v systems are better. In all cases you will need a suitable recharge/condition method. Make sure the wiring for additional batteries is done correctly so that the juice goes though all batteries correctly. Let me know if you need help understanding this.
Do be cognizant about leaving the generators unsecured overnight. There have been reports of a portable generators "walking away" if left outside and/or unattended. I actually disconnect my gennys at night and put them under lock and key before retiring for the evening and even this is no guarantee.
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