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250 liter gaseous H2 ?
That is a tiny bit.
Here some basic high school thermochemistry.
That is about 10 mol = 20 grams with an energy of 10*286 kJ/mol = 2860 kJ.
2860kJ / day (the 250l is a day yield) = 2860000 J / 86400 s = average power of 35 W.
The size of the panel is 1.65m * (assumed ?) 1m = 1.65m2 which collects 1650W when exposed directly to the Sun.
Efficiency = 35/1650 = 2.2% and not the "15%".
Electrolysis powered by the same solar panel is probably better.
But it is a first step to more.
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