A grid-scale battery store rated at is charged with from the grid in each cycle

PHYSICS · Multi-part · Fermi University Physics · Earth, Climate & Energy Physics · Energy systems, storage and demand · Energy systems, storage and demand

Energy from Physics, Ch Storing energy: cells, rotors, air, heat and hydrogen

Problem

A grid-scale battery store rated at 500 MWh500\,\mathrm{MWh} is charged with 500 MWh500\,\mathrm{MWh} from the grid in each cycle, cycled once a day, every day of the year (365365 cycles), with a round-trip efficiency ηrt=0.85\eta_{\rm rt} = 0.85. ((a)) Find the energy it loses over a year. ((b)) Find the energy it delivers over a year.

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