electrical Inverters for the Pod

What size is adequate to run the TV, CPAP, computers, fan, etc.  probably not all at once, but this is camping.  The TV is around 25watts, CPAP (not sure, not mine), Computer 60-70watts, fan 80watts.  What am i missing?  If i am right, just add the loads, right?  so a 500watt inverter would do it no problem.  So double it to be safe and get a 1000 watt?  What have you experienced with your battery life and using inverters.  i have two CG 6volt batteries, 220 amp hours.

Another question about solar.  I have a Zamp 80 with a 10amp controller.  Could i add another 80 watt panel and use the same controller? the zamp max is about 4.5 amps so that would be 9 amps to a 10 amp controller.  Will that work?

The cpap does draw a lot especially if you use the humidifier

i think a 2-300 watt is plenty then.  do the fans that are cooling the inverter draw much when the inverters are running?  i think you just plug them in as needed based on the feedback.  i thought about hardwiring one, but seem like overkill for 300 watts.