I have a 3600 isolation transformer. Recently one of the jumpers on the AC input started overheating to the point of smoking. This is the jumper between J17 and J20 used for 115 V input. The transformer feeds through a Victron inverter/charger to my AC panel. I have had this setup for several years with no problems but with usually small AC loads, Just installed an air conditioner that draws 10-12 amps running. Ran this setup for a few days at the yard before moving to a marina. Ran fine plugged into 30 amp 115V shore power at the yard and I didn't notice any problems. Moved to the marina also connected to a 30 amp 115V outlet. Noticed two things. One, the air con has trouble starting and the inverter kicks in to boost the shore power when the compressor first tries to start. Then after the air con had run a while I started smelling smoke. Shut down all power and checked all the wiring AC and DC and could find nothing even warm. Restarted everything and smelled smoke again and finally traced it to the isolation transformer. Open the case and found the jumper smoking and very hot. My guess is there's a problem with the shore power at this marina but would welcome any comments or suggestions.