I had a hardwired style in my Arctic Fox truck camper.
The problem with it, is that any time I wanted to run the A/C on generator power, it was an exercise in futility. The EMS would kick the power off when the compressor kicked on, then the compressor stalled and went in to a locked rotor condition, and wouldn't attempt to start up again for several minutes.
The only solution was to enable my inverter, so the inverter would pick up the load momentarily while the EMS kicked power off.
This happened every time I wanted to run my A/C on a small portable generator.
I finally gave up on that nonsense and removed it last year and sold it on eBay and went to a portable unit.
Here's my video on the portable unit