If your batteries are not too old, and you don't plan to make more than one pot of coffee per day and watch a few hours of TV, you don't need one. More solar panels, yes ! When it comes time to replace them, get a pair of 6V golf cart batteries. Probably cheaper and they will store a bit more power.
Do you have an inverter ? If not you want a pure sine wave, inverter/charger/automatic transfer switch and you can get rid of your old converter.
I would buy a 2000W generator before I would buy one of those "solar generators". Nice but OVER PRICED !
