Comments by "MRA" (@yassassin6425) on "" video.
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The fuel cell assembly was over a metre tall and half a metre wide and weighed 111kg (more than a person). The Apollo Service Module had three of these assemblies onboard. Each assembly produced about 1400W at about 30V.
An electric car will use around 10kW, so you’d need 7 or more of these fuel cell assemblies in your electric car. Consider where they will go in your little e-car. Consider the fact that they will add a considerable mass to the vehicle, increasing it’s energy requirements, so you’ll need more than 7 to provide the extra power needed to move the extra weight. And this isn’t taking into consideration the complexity of storing the liquid hydrogen and oxygen.
Also, money was no concern for Apollo - the budget was almost unlimited. Fuel cells are expensive and when you factor that in to car production or household use, there are cheaper alternatives. Moreover, hydrogen is not easy to produce. In fact, the round-trip of electricity to hydrogen to electricity is only about 40% efficient. Compared to the same round-trip using batteries at maybe 85% efficient. That means you need twice as much input energy for the same trip if you choose a hydrogen fuel cell over batteries. It is also expensive and problematic to store.
So, beyond Apollo, in practical terms, they’re not really feasible at all.
Saying that, fuel cell technology based on that used by Apollo has long been developed for use in cars. It’s just not there yet, so battery technology is used in the meantime. You can see some fuel cell powered busses - but they are way more expensive than diesel and so not very common.
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