We get sun here, well at least half of the day. It's usually cloudy by noon as the weather compresses over the mountain tops. Even with that my solar keeps my batteries much happier than when we were using the generator every day. Our rest voltage the morning after using a fully charged battery would be 12.5v, after one day of charging for a few hours with a generator it would be 12.4v resting the morning after. The solar will get the battery to the point that the generator could early in the morning and keep it in float all day by covering our loads. It is as close to 100% as possible by the time the sun goes down. try that with a generator.