When the night falls i tend to get a strange reading on the weather display and WDL. The solar W/m2 value stays on the very last value that it was before it was 0. Which means that when it is night time it still says 3W/m2 which is wrong, it should be 0. I have noticed that this also happens because when the solar sensor stops responding for some untoward reason WD tried to conpensate for the error by stating its last value it was before it was 0. In some ways this error is good. But in this way, the error gives false readings.