Video suggestion: Mains battery units and HF damage to capacitive mains psus

[Psi]

"Matthias random stuff" on YouTube did a video showing how his large circular saw would cause his mains battery bank to go unstable and output bursts of 5-7khz which blew up another device he had connected which used a capacitive mains psu.

Might make a cool video to try this on one of Dave's mains battery units and, if they also have the issue, build a little mains capacitive PSU to show how they will overcurrent themselves when given 7khz instead of 50hz.
I imagine the zener pops from overcurrent, goes open circuit, and then there's no more voltage regulation so the low voltage mcu/circuit gets like 20mA 300V instead of 20mA 5V  .