Compare packages by their expected annual generation, usable battery capacity, inverter size and how well they match your household’s electricity use, rather than relying only on the advertised system size. Check the battery’s warranty, cycle or throughput limits, monitoring features, backup capability and whether the components are compatible and serviceable in Australia. Ask for an itemised quote covering installation, switchboard work, approvals, ongoing fees and any assumptions about feed-in tariffs or electricity prices. Use a suitably licensed, reputable installer and compare independent quotes before deciding; available rebates and final savings depend on your circumstances and current government or retailer rules.