Save 30% of your electricity bill with a solar-panel-only-system to power daytime loads. Here you also have the option to apply for net-metering, in certain councils. This is a great option if you do not need batteries.
Save 80% of you electricity bill by adding batteries. This is where any excess electricity is stored in batteries for evening use making you more grid-independent. Only the essential loads will run off the batteries.
Become 100% self-powered by adding more solar panels and batteries. As you can see, you can start your system off small and grow it over time allowing you to become energy efficient and grid-independent.