Yeah, that's about the cost I recalled (and have found online). What I haven't found was his estimate for what one of his "commercialized" systems would run, which was "much" less. I seem to recall that it ran around $50K, but I certainly wouldn't swear to it.
The article is on FR ... somewhere. I was interested when it was first posted, because my cabin is “off the grid.” Landlocked - adjacent owner will no allow a utility easement - so it is off the grid permenently.
But his system is too expensive, too complex, and too hard to maintain - a jerry can of gas for the generator is dirt cheap, in comparison.
Also to be found on FR - honda or toyota, I forget which, had an experimental sunlight - to - hydrogen station for refueling fuel cell cars.
Put thos three together, and $50k is probably a high estimate.
I think you could do it now, for $20k in panals, $10k for the cracker, $10k for the fuel cells, and use the rest for plumbing...