I bought this as a backup for an inverter I was using to power a small freezer during a public safety power outage. After sitting on the shelf for almost a year we decided to hook it up to solar panels to power a 1.5hp pump that pressurizes our home water system. Since we have our own well, we lose running water when the electricity goes out. It worked perfectly. Because it worked so well on a test basis, we decided to keep the internet off permanently for this feature.