In the U.S., the National Electric Code requires UL-listed components. The inverters, the panels, wires, even the racking must be UL-listed and not simply "UL t

In the U.S., the National Electric Code requires UL-listed components. The inverters, the panels, wires, even the racking must be UL-listed and not simply "UL tested". The manufacturer has to pay UL a few million dollars to list their products on their database in order to pass inspection. An inverter that costs $500 on Amazon costs about $5000 and available only through certain distributors. Australia has no such requirement, and so they can use the cheapest inverters from China/Amazon.