This seems to fall into a category of pitches where someone knows a secret that will upend the oil industry. The engine that runs on water instead of gasoline

This seems to fall into a category of pitches where someone knows a secret that will upend the oil industry. The engine that runs on water instead of gasoline is probably the most famous and blatantly grift version of this pitch. During the CRISPR hype cycle there was a pitch for using genetically modified cells that were better at producing ethonal to produce cheap bio-fuels. In this pitch, the secret sauce is using DC directly from solar cells in budget electrodes to produce cheap hydrogen fuel. I'm skeptical, but not immediately dismissive. I would like to see a prototype electrolyzer running directly off solar panel DC. This feels like a prototype that could be built for less than $1k in materials, and is probably the single largest impact thing he could do to improve his pitch deck.