With low feed in rates, there is little financial benefit on your electricity bill to feed excess solar power back to the grid. Battery Storage is becoming a popular choice for both new solar installations and existing solar system owners coming off high feed in tariffs wanting to optimise their excess solar power.
In a Grid Connect Battery Storage system, solar panels supply power to the house with any excess charging the batteries during daylight hours, switching the house to its own stored battery power during peak usage/tariff times at night. How long your stored power will last will depend on the size of your solar system, how much of your solar power you use during the day and the size of your battery bank.