I have a HPWC connected to 100 amp circuit and it works great. I decided to install (myself) a NEMA 14-50 plug into my panel through a 50 amp breaker-fuse just for a backup in case my HPWC goes down. My install went fine, plugged car in using charger that came with car and all looked good (green lights). Of course the HPWC is not being used at the same time. I noticed after about 30 min of charging the 50 amp breaker tripped. I reset it and it did it again after another short period. I then lowered the charge down from 40 amps inside the car to 30 amps and it did not trip after that. Any ideas what might cause this? Should I replace the breaker with a 60 amp? thank you.