> the conversion is inefficient. It takes a lot of power to extract H2 from H2O.
How inefficient? That number matters. If it takes 500 kWh to make a tank that stores 100 kWh, you'd be a fool to use that energy directly, as that tank is going to store hundreds of times that much (at least) over its lifetime.
How inefficient? That number matters. If it takes 500 kWh to make a tank that stores 100 kWh, you'd be a fool to use that energy directly, as that tank is going to store hundreds of times that much (at least) over its lifetime.