If you are only a 30 amp, you will need to shut off the AC or water heater when using the microwave or large draw appliances like a toaster or hair dryer. The AC alone probably draws around 15 amps. Throw in 3-4 amps for the converter and another 4-5 for the lights and you are getting close to the 30 amps. Turn on a TV or the fridge, and you maxxed out.
We just simply learned to walk over and temporarily turn off the hot water heater any time we ran something substantial like the microwave or vacuum or hair dryer.
Our unit has three TVS, two fridges, and too many lights. It's very easy to forget what's on and trip the breaker.