Compare each package’s solar panel capacity, battery usable capacity, inverter, warranties and total installed price—not just the headline discount. Check whether the battery is suitable for your household’s usage, electricity tariff and local export limits, and ask for expected annual generation and savings assumptions. Confirm the installer’s credentials, product availability, workmanship warranty and after-sales support, and obtain itemised quotes from several providers. A licensed installer can model different system sizes for your home, while the Clean Energy Council and energy.gov.au provide useful information on approved products and incentives.