@mattgrayyes Fun fact about the kettle test: Back when I still worked on energy management systems I used a kettle as a dummy load all the time. I had a bunch of incandescent lights to do the 50w to 200w range and a kettle that did about 2kw for a moment on a good day. Used it to test charging stations, electricity meters and some smaller battery systems. (We did get a proper electronic load at some point.) The main problem with the kettle was that the noise kept summoning people that wanted some hot water to the lab. Folks kept drinking the coolant from my dummy load.

When a colleague did some investigation into the security of vehicle charge points, he used something else though: https://youtu.be/pUEp3uWAWqY?si=BJgFhl0kMjpkVq5X

(Full video: https://media.ccc.de/v/34c3-9092-ladeinfrastruktur_fur_elektroautos_ausbau_statt_sicherheit German but should have English translations)