Thought it would be useful to start a discussion about going off-grid or building an off-grid home in Victoria with a highly variable climate. Due to the low solar levels in winter the off-grid solar array needs to be oversized to account for poor winter conditions and a backup generator is almost always required (at least for the 3 winter months). This is much different to the climate in northern states like Queensland with much higher solar irradiation all year round.
Here is an off-grid solar system designed and installed by myself and Harpoon Electrics in Venus bay. This system has has a 9.15kW solar array with the rear string of panels tilted north at close to 45 deg to maximise solar generation during winter. There is also a 15kVA backup diesel generator.