The home batteries will all operate as a group, not individually, so an individual battery will not be responding to peaks and troughs of the grid by itself. As an example, in 24 hour period, the householder may see additional charge being fed to the battery during the night if there was excess wind energy available on the grid, but there is not enough demand on the network to make use of it. Alternatively, during the peak demand hours of early evening the battery would be used to power the house completely. Effectively, it’d remove the household’s consumption from the grid, thereby reducing demand. At all times the health of the battery is monitored and shown in the Powervault portal, where the amount of charging up, discharging and energy savings can also be seen.
You, as the Powervault battery owner, can leave the grid services contract at any time and will be charged the discount, pro-rated on length of time remaining in the grid services contract. You can read the full terms & conditions here.
Whether you take up grid services or not, you can still make significant energy bill savings by upgrading your solar PV system with the Powervault 3 battery storage, saving your generated power for use later in the day and/or charging on cheap overnight electricity.