I am talking companies (well one in particular) that generate hydrogen off grid - no mains electricity from just sunlight and water. Which is exactly wha HYSR claims they can do but not yet in anything like comercial efficiency.
check out the current projects in play - they have been generating green hydrogen for 2 years now at Sines. The Exolum project in Madridis to do exactly what you describe, generate green hydrogen from sun and water for a "standalone" hydrogen fueling station. They are in discussions for a massive project in Bakersfield California
watch the simple video that lays out exactly what they do:
no nano technology, no radically new solar panels just a different way of thinking. (Oh and if you have a wind turbine they can generate at night as well.