10 years ago i made a chest freezer temperature controller with a BASIC Stamp. It uses an Opto 22 240D45 zero crossing, 45A SSR to switch on and off a freezer to keep the temperature between -5 and +5C. It has been working perfectly for 10 years (however it is not used all the time, only about 20% of the year).
Now I am building another one but this time with an Arduino. I was reading a Crydom app note about SSR’s and it says do not use zero-crossing SSR’s for inductive loads. I don’t understand… what is the reason to not use zero crossing SSR’s for inductive loads? When you connect a freezers plug to an outlet it is going to be “random-crossing”.
Why have I not had a problem in 10 years… is it because the compressor in the freezer isn’t a very large inductive load?
Thanks for any help!