Look beyond efficiency and compare the panel’s product and performance warranties, degradation rate, temperature performance and suitability for your roof and local conditions. Check whether the panels and proposed installer appear on the Clean Energy Council’s current approved lists, where relevant to your project and available incentives. Obtain several itemised quotes covering the inverter, mounting, monitoring, installation and after-sales support, rather than comparing panel prices alone. A licensed solar installer can confirm the system design, electrical requirements and likely output for your home.