[smallscaleH2]

Getting back to the other calculation in which there was a mistake; ie this one:
"1 liter of gasoline = 0,26 gallon of gasoline
14 liter of hydrogen = 1 kg of hydrogen @ 1 bar (see uigi.com/h2_conv.html )
1 kg of hydrogen = energy in 1 gallon of gasoline (see heshydrogen.com/hydrogen-fuel-cost-vs-gasoline )
0,26 kg hydrogen = 3,64 liter of hydrogen (compressed at 1 bar) -0,26 X 14-
So in this latter calculation, it looks as if a mere 3,64 liter tank with hydrogen, without any compression at all would do "

jamesqf said you would get about 1/2 lb of H2 in a SCUBA tank: that's 0,45 kg of H2.
1 kg H2 = energy in 1 gallon of gasoline = 33,41 kWh (see heshydrogen.com/hydrogen-fuel-cost-vs-gasoline )
0,45 kg H2 x 33,41 kWh = 15,03 kWh
That's far more than what I calculated in my other calculation (I calculated a maximum of 6,95 kWh).
6,95 kWh / 33,41 kWh = 0,208 kg of H2
0,208 kg of H2 would be 2,9 liter of hydrogen (according to uigi.com/h2_conv.html )
So 2,9 liter, whereas in my other calculation I had 11,25 liter.
In this other calculation I calculated it using a pressure of 206 bar; so in this calculation I would have a pressure of 799 bar
--> 11,25 x 206 = 2317,5
--> 2317/ 2,9 = 799 bar