Simply put, it pays to store the rays! With low feed-in tariffs and high electricity prices, you should be looking to self consume as much of your solar energy as possible; and a solar battery can help you do this. Without a battery, any excess solar energy generated during the day gets fed back to the grid at a low rate, and when the sun goes down you have to rely on peak-rate electricity to power your home. Unless you have a Feed-in Tariff (FiT) of 44c/kWh or greater, a solar battery will help reduce your bills by increasing your solar self-consumption.
The other major benefit of a solar battery is that it can provide continuity of energy supply during a power outage. If you live in an area prone to black-outs or have medical equipment that requires continuous power supply, you should make sure you purchase a battery that has sufficient back-up capability to suit your needs.