Compare packages by total installed price, system size, battery usable capacity, expected output and warranty terms—not just the headline discount. Ask whether the battery is sized for your evening usage, whether the inverter can be expanded, and how export limits or your retailer’s feed-in tariff may affect savings. Check that the installer is appropriately accredited and obtain itemised quotes from more than one provider. Rebates and eligibility depend on your location and circumstances, so confirm current details through the relevant government website and ask the installer how they apply to your quote.