Start by listing your daily and seasonal energy use, including high-load appliances, then check whether your solar array, batteries and inverter can cover demand through cloudy periods. Include a backup generator or other contingency plan, suitable battery ventilation, surge protection, earthing, isolation switches and safe cable installation. Your checklist should also cover water pumping, communications, battery monitoring, cleaning, inspections and access for repairs. Have a licensed solar electrician assess the design and confirm relevant Australian standards, permits and local requirements before installation.