I set up a thermostat in my garage that comes on at 80 degrees F. and sends a 6 VDC battery voltage to control a 120 VAC solid state relay which power s up the vent fan. The fans always quit within 2 months to a year with no o bvious defects. These are inexpensive 20 inch box fans with induction motor s. I have tried several brands and styles of fans. The latest was a Home De pot unit that only lasted 2 months. Does anyone know of a reason why I can't run an induction motor from a SS relay? What is killing the fans? I have taken two apart and there is no smoke smell, no visible damage and if there is a capacitor it tests OK. Thanks for any ideas. I am going to switch over to a mechanical relay.
Dean