Solar inverters are weatherproof and can be placed both indoors and outdoors. However, they have to be placed in a location that allows for a good Wi-Fi connection. Your solar installer will likely survey your property and recommend the best location to place your solar inverter. Placing your solar inverter outdoors will ensure minimal disruption during installation and future maintenance. However, it is often recommended to place your solar inverter indoors. While locating your solar inverters indoors may occasionally result in some excess heat being generated in your home, keeping them indoors in a cooler environment can help to improve their efficiency by 1 to 3%, as well as, extend their durability.