For no lights, check your converter.
For power, you may find you don't need more than what you have depending on how long you're out.
Like you, I only use battery power for lights and the water pump. Fridge is older and doesn't have 12v-only required parts. Lights are fluorescent (overhead) and LED (reading). I use battery operated LED puck lights for seeing inside cupboards, etc. My water pump is left on all the time, but only kicks in when a faucet is running.
For charging my cell phone, I use a 4-D battery pack (
02 fan & battery). I have charged it for over a week without changing batteries. Laptop, I limit my use and use the house battery or an external power pack to charge. (
portable power pack). I usually only charge once every 4 days due to limited use.
I have one 12v group 31 AGM battery for the house. A four-day trip without worrying about power will not even put a dent into the house battery. Although I haven't tried, I suspect with how my battery handles my needs, I could go 2 weeks without recharging. If I need more than that, I would go with a solar power setup rather than the generator - it would be more than sufficient to handle recharging needs without any added cost for fuel.
