What is the difference between DC fast charger (DCFC) with V2G versus a DCFC that is non V2G?

A DCFC with V2G will help you save money in a more efficient, effective way through the precise control of energy flow in and out of a heavy-duty vehicle’s battery and to the electric grid; besides charging when rates are low, in certain areas, V2G allows vehicles such as electric buses to earn revenue by selling extra energy from their batteries back to the grid.