A solar and battery package should be assessed on your electricity use, roof space, local sunlight, backup needs and budget, rather than just its advertised system size. Compare the panel and battery brands, warranties, inverter capacity, monitoring features, installation inclusions and whether backup power is available during an outage. Upfront costs and possible incentives vary by location and circumstances, so check current information through energy.gov.au and your state or territory program. Obtain detailed quotes from appropriately licensed installers and confirm expected savings with your retailer before signing.