Compare quotes on a like-for-like basis, including system size in kilowatts, panel and inverter brands, warranties, installation charges and any battery costs. Check whether the advertised price includes applicable small-scale technology certificate discounts, as eligibility and values can change under government rules. A cheaper quote may not offer the best value if it uses lower-quality equipment, has limited warranty support or excludes essential electrical work. Seek several itemised quotes from appropriately accredited installers, and confirm current rebate details through energy.gov.au or the relevant government program.