An off-grid system must generate and store enough energy for your household, including during cloudy periods and winter, when solar production can fall. It usually includes solar panels, batteries, an inverter and sometimes a backup generator, with sizing based on your electricity use and location. Batteries are often the largest cost and may need replacement during the system’s life. A licensed solar installer can assess your site, explain maintenance and confirm whether local approvals or electrical requirements apply. Compare quotes carefully and check current information from your state government and energy.gov.au.