I agree with both Golden HVAC and wintersun.
Buy two 6 volt wet cell deep cycle batteries and an inverter/converter. Using a Honda generator for times of high amperage use is a very good suggestion. If the price of the Honda is not in your budget, then one of the cheap Chinese knock-offs at less than half the price might work. Keep in mind they are cheaper for a reason.
Solar panels are a more expensive and complicated solution, but are totally quiet and can charge the batteries up to 100%. (Your generator will charge wet cell batteries quickly up to 80%, but then it is very slow for the last 20%.)
