WestSun set up a 15kWh battery for me, and upgrading my inverter and installing some new panels at the same time. Having the correct licenses and insurance policies insurance policies is the bare minimum amount prerequisite for solar installers. But different states have to have different procedures for solar installers. https://bestsolarpanelinstallerswesternaustralia.business.blog/2024/09/19/the-comprehensive-guide-to-a-7-7kw-solar-system-in-western-australia/