One of my charge controllers seems to have developed a fault. In low light levels, when the array is connected to the controller, the array voltage is pulled down from 122V to around 58V. The array current shows 0A but using an amp clamp, I’m measuring around 0.8A. If I manually set the charge state to OFF I get the same result. When there is more sun, and the charge state is ON I am seeing about 100W less than normal.
Has anyone seen this before?