CNET experts have compared the most popular solar inverters' specs, warranties, prices and more. The solar inverter is one of the most important parts of a solar system and is often overlooked by those looking to buy solar energy. Deals are selected by the CNET Group commerce team, and may be unrelated to this article. What is the best overall solar inverter? Many people have been investing in going solar to reduce high electricity bill and. Choosing the right inverter can make or break your system's efficiency, safety, and long-term performance. Without this device, all that sunlight is simply wasted. - Check how long the warranty lasts.