Yes, STC rebates are available where you have a Fronius SCERT inverter coupled with a Selectronic SP Pro micro-grid. This is a standard solution we offer.
Your solar system should cover your power needs 95% + of the time, however we highly recommend a good quality, automatic start generator to ensure you have energy security and full power capacity throughout the worst days of winter.
You want as large a rooftop solar PV system as you can fit on your roof to reduce the amount of time you need to rely on your backup generator that may be required for periods during winter periods or times of low solar radiation (i.e. multiple cloudy days).
We generally recommend a minimum 10kW solar PV system, but the final size will depend on your anticipated load/demand. We can help you work this out by using our load profile sheet as part of our comprehensive quoting process.
The cost to go off-grid will depend on your expected/anticipated energy demand. With knowledge of your energy demand we can then help you size your battery storage, solar PV, generator, microgrid inverter, etc.