> The minimum theoretical energy to liquefy hydrogen from ambient (300 K, 1.01 bar) conditions is 3.3 kWh/kg LH2 or 3.9 kWh/kg LH2 with conversion to para-LH2 (which is standard practice) [1].
It is not guaranteed to be 30%. And you're entirely basing your argument on the idea that batteries will get radically more advanced, while hydrogen technology will not. What happens when Toyota makes a Corolla powered by hydrogen at the same level of cost and the fuel is basically free (made from excess green energy)? Will BEVs really have much of a future in that scenario?
https://www.hydrogen.energy.gov/pdfs/9013_energy_requirement...
It is not guaranteed to be 30%. And you're entirely basing your argument on the idea that batteries will get radically more advanced, while hydrogen technology will not. What happens when Toyota makes a Corolla powered by hydrogen at the same level of cost and the fuel is basically free (made from excess green energy)? Will BEVs really have much of a future in that scenario?