Why not just buy the batteries and charger and skip the cost of the car?
Depending on source, Japan's electricity cost is 50-100% higher than the U.S. At $20k per car and the above $800/yr per car saved (In U.S.$400-530), what is the return on investment per year (this question doesn't include upkeep like maintenance cost of the car)?
How fast do you wear out the batteries due to the increase of charge/discharge cycle?
Comparing the savings of time shifting usage with approx $120,000 cost of the cars, what could the same company do to reduce consumption using $120,000 to reduce energy consumption (therefore reduce amount of the evil CO2 created)?
How many mile will you loose if if the cars are used for commuting?
Would have posted on the original site, but my login cookie gets blocked.