Generator hooked up efficiency ?

Yes you should be able to run the air conditioner without trouble. Maybe both the small window air conditioners but probably not all three. TV, lights, water pump, computer are about nothing. Need to watch the microwave, electric kitchen appliances, and keep the hair drier on medium or low. Worst case you need to turn something off and manage your power but all should work fairly well. May need a couple gas cans for extended run time.

Your converter should not draw excessive power unless the battery is allowed to get low. Even then you should be fine within an hour or two and the battery back to full charge.