Alternator, Inverter, AC compressor issue?

Hi I was wondering of someone could help me with this,

I got a 2000 Peterbilt with a Cat
So i decided to put an Air Fryer in my truck and it runs off the inverter i have hooked in my sleep. The Inverter powers an mini fridge only and the air feyer when i use it for about 2 years it was fine
Then after anytime i use the air fryer theres a squeel coming from the front if i have the AC on, but if the ac is off no squeel,

slowly now even with the ac off there is a squeel only when i use the air fryer
I tried unplugging the mini fridge and using it didnt make a difference

Is it time to change parts?
Any ideas?

Belts and ac compressor are new and adjusted with in the last 6 months