We did that in high school chemistry.
Not at 15% efficiency you didn’t. ;-)
Direct to electric solar tops out in the low 20%’s in anything affordable and electric storage is impractical. Electrolysis is horribly inefficient. 15% direct to hydrogen is orders of magnitude more efficient than solar>electrolysis>H conversion. You will note that I did not say run your car on it. I said HVAC and water heat. If these panels are realistically priced would you not like to see a 60% drop in electric/gas bills?
Yep. Electrolysis of water is still the same whether a generator at the power plant makes the electricity or a solar panel does.
And it sure is funny that a volume of hydrogen is given here but not the pressure thereof, so no way to figure out just how many moles of hydrogen were generated.