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For those looking (like me) for the catch:
If you have solar paired with proton exchange membrane electrolysis, you can generate hydrogen very economically. PEM electrolyzers are already around 80% efficient but supply is limited right now. Hydrogen is a pain to store, but if you feed that hydrogen into the Haber-Bosch process you can very efficiently produce ammonia. Ammonia fuel cells are very promising if you're looking to decarbonize container shipping.
Ah so the ammonia solves the storage issues, thanks for sharing
In terms of vapor pressure, ammonia behaves a lot like propane. You can store it pretty much like propane, liquified under pressure, but it has less energy density and high heat of evaporation so it's best to withdraw it as liquid to not freeze out container