Power cord fuse for duet 2 wifi
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You've not factored in the AC heater you want to use yet? That will be on top of the PSU requirement.
Don't forget if your PSU is 500W it will be consuming more like 625W on the mains side. Your AC heater will be added on top of the 625W.
Edit: Unless by 'power supply' you mean the total power consumption of your system...