I had a 2000 PSW inverter in my AF 811 for 10 years, with two wet cell batteries for about 7 years, then 2 AGM batteries for the last several years I owned the camper. It ran the microwave just fine.
I use my microwave all the time, at least once a day and there's never any issues.
All the various inverters I've used since the mid 90s have a built in transfer switch, so the easiest way to install them is to disconnect the shower power cord from the AC panel, route it to the inverter and then run a new air from the inverter to the AC panel.
All AC circuits are powered from the inverter.
With this setup, I often will power my fridge by the inverter when driving.
The inverter will run the A/C, but two AGM batteries don't have enough capacity to do so, so I never expected the A/C to get powered by the inverter.
Xantrex PSW 2.0 in my AF811This is the AGM upgrade I did in about 2016 or so
