Compare usable battery capacity, inverter output, panel generation, backup-generator requirements, warranties, monitoring and local servicing. Unlike a grid-connected system, off-grid solar has no grid to rely on during extended cloudy periods, so seasonal energy modelling and adequate storage are important. Ask a licensed installer to assess your household’s usage, site conditions and future needs, then compare the total installed cost, maintenance and likely component-replacement costs rather than panel prices alone. Rebate availability and eligibility can vary, so check current guidance on energy.gov.au and with the relevant government department.