we bought the solar panels from Amazon. They are made by a company called Rich. they are 200 watt, 25 volt and are wired in series. They are connected to a Bluetti Generator, 2000W generator . the generator can be charged from a wall plug, which we did. But the solar panels are not charging . The icon for the panels is lit, but not charging the generator. we keep getting a calibration error . Why, I don't know. I 'm thinking we may have to send it back to the factory. Not sure.