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You will be losing about 35 - 40% of the energy in the battery store/restore process. Add 30% for the equipment costs and maintainance, assuming you are doing it at large enough scale.
This means that the project will be viable only in countries that have at least 70% price difference between peak/offpeak hours.
Other problem is that this must be a long term plan with near 10 - 20 years durability to be economically viable. Nowadays governments and energy companies pay for that power. Are you sure they will pay the same or will even pay at all in 15 years from now?
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