My compressor also switches off for a period of time after an hour or so even with the humidity stat on max, a timer on the pcb board seems to trigger for the defrost cycle. I will remove it completely on the next prototype.
If your high temp stats tripping (too high superheat) it probably points to either a low load on the evaporator or that your charge level is to low. Better this way though, than too low a superheat and liquid trying to be compressed, try adding a little more charge at a time if your evap load is satisfactory.
Regarding your ssr if you are going to burst fire your compressor be aware that with such a large inductive load, the current demands on each pwm cycle especially if you are going to be zero crossing will be massive and it might not last long.
I will have to find my camera and put up some photos of my unit but it does not look much.
Keep up the good work,a very interesting project.
All the best
sheepdog
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