Europe finances a giant battery to store energy

[Fakir]

What do you mean Gaston! 97% yield don't believe it? Neither do I!

Regardless of the storage efficiency (which may be very good), that of the electrolysis and the fuel cell is poor.

I think this "battery" should not return 50% of the energy supplied

You will have some details here: https://www.econologie.com/forums/la-voiture ... 11705.html

In fact, the energy chain of H² has a lower yield than that of accumulators.
80% Electrolysis 93% McPhy storage 60% heat pump and 95% efficiency of the electric car
Or 42%
For the accumulator 70% for charge-discharge and 95% efficiency of the electric car, i.e. 67%
The efficiency of the gasoline energy chain is around 10% ...

[Gaston]

So if we eliminate the car, the Electrolysis -> Storage -> Fuel cell efficiency comes to 0.8 * 0.93 * 0.6 = 0.45.

45% is still very little for a storage device