Numerous homes choose a 3kW solar system, which will require twelve x 250 watt solar panels. Roughly panels will be required determined by their specific output. How many STCs your solar system is suitable for will depend on your site, date of installation and the amount of megawatt hours (MWh) https://citypointsolar.com.au/abb-aurora-power-one-inverter-fault-error-codes/