Compare more than the headline price: check the system size, panel and inverter brands, estimated annual generation, installation inclusions and any switchboard or roof work. Make sure the quote clearly separates the upfront cost from any Small-scale Technology Certificate (STC) discount, which can vary with system details and government rules. Check the installer’s credentials, workmanship and product warranties, and ask who will handle repairs or warranty claims. Comparing several detailed quotes and checking the installer through the Clean Energy Council can help, but your final choice should reflect your home, energy use and budget.