I was hoping to find a user or service manual for the microwave (Panasonic NN-S563WF) that would describe the expected power draw with more clarity, but the service manual I did find is really weird.
I think it's for the New Zealand version of this model, plus various others? Anyway, it's for 240V, but it says 1120W power requirement and 1200W output which seems *highly* improbable. 🙃