I have a new 5,500 BTU portable A/C for my backyard shed. The shed has a 14/2 feed to a single GFCI socket. The A/C runs fine for some cycles but frequently trips the GFCI at the end of a cycle when the cooling is shutting down. It never trips the circuit when starting. This is true with nothing else is on the circuit.
Any advice to how I can get it to work? Is this an A/C issue or a GFCI issue? Would an RV soft start smooth out the shutdown surge? (It says it is for startup) https://camperreport.com/softstartrv-questions/ Could it be back EMF from the motor shutdown? (I am a novice on this issue.) Can I add a capacitor or reverse-biased fast diode to solve it? (Are they for noise only)