Getting two or three solar quotes in Perth can help you compare systems, pricing and installer experience, although the right number depends on your needs. Each quote should clearly list the panel and inverter brands and models, system size, estimated annual generation, warranties, total price including GST, installation inclusions and any assumptions about your roof or switchboard. Check whether the installer is appropriately licensed and CEC-accredited, and ask who will arrange grid-connection requirements. STC discounts and other incentives can change and depend on eligibility and market conditions, so confirm the current details through energy.gov.au and the installer.