Battery technology is an area that is currently undergoing rapid changes, and there are exciting new developments that we are keeping an eye on. In the meantime, for the average home there are two sound options at this point in time.
This option is about remaining connected to the grid but storing excess solar generated electricity in a battery which can then be used during the evening when energy prices are at their peak. The grid is then used as a backup when there is insufficient power left in the batteries.
Under this option you minimise the amount of energy you need to import at higher prices. When determining the value of this option, keep in mind that with the exported energy to the grid, you would have received a feed-in tariff from Enova, so the economics of battery installations need to be worked out on an overall saving of what you would have paid for the energy from the grid (for example 25 c/kwh) less the feed-in tariff you would of received (for example 9 c/kwh) so the amount to consider is the difference (in this example 16c/kwh). The economic benefits of this option depend on factors such as the size of your solar system, how much energy you use in the house during the day when the solar panels are producing energy and how much energy is left to be then stored in the batteries.
For more information when considering this scenario go here