My Carista (black) is plugged in all the time - I have the DPF app that I sometimes start when I notice a regen happening, or if I think one should have started. However, two things with mine. Firstly I have an Ablemail trickle charger between the leisure battery (with solar) and the starter battery which protects the starter battery from the drain. Secondly, the Carista sometimes seems to go into a very deep sleep, or become totally unconscious, and I have to unplug it and plug it back in again to get it to be recognised in the app.