To convert 12VDC to 240VAC for the car, I have bought a 🛒220W inverter for ~8€ and a 🛒cigarette lighter socket for 1.50€. Basically, I just wanted to have USB-PD but the 12V to USB-PD converters are all buck converters (at least the ones I've tested) - as step-up to 24V is more expensive, it is advisable to just step up to 240VAC directly.

🗒️Note: See other gadgets you can get for your car

🛒Links are from aliexpress (Q2-2025) and may be expired. Search for alternatives. I do not affiliate, nor encourage to buy stuff.

The plug is solid with the red ring as the lock - I am content with it.
Do not forget to at least make a knot in the cable as strain relief (which is still the quick&dirty method).

#TODO: add oscilloscope measurements