Installation is yet another component you should get into consideration when hunting for a solar panel supplier, plus the warranties included in their services. Your installer will figure out the appropriate size for the system. The size will likely be based on your electricity needs (decided in phase 4) in https://citypointsolar.com.au/why-a-6-6-kw-solar-system-is-the-perfect-fit-for-your-perth-home/