TomG2 wrote:
I did not want to make anything complicated. I asked if my investment in solar might be useable while I am in a park hooked to shore power. Not going to be wiring in transfer switches, etc. I will probably just flip the main 120 volt breaker off in the converter
You mentioned microwave. When you flip main 120V breaker off, you will have to run 120V off the inverter.
Transfer switch is a necessary safety measure if you don't want to fry your inverter and/or batteries. You can do without this switch but the risk will be higher.
Your only other choice (avoiding both risk and complications) would be to stop using 120V devices while on solar, though this would be uncomfortable and would reduce your energy savings to $1-$2 per month (compared to shore power).