Some days it will work for a few hours before turning off. There is no consistent amount of time before it turns off. I’m running in a 2011 Maine Cat P47 with Balmar 24v alternators and have 3 170 watt solar panels controlled by a Blue Sky Solar Boost 50 unit. Speed of travel also doesn’t seem to have an effect on when it will shut off. This has been going on since i bought the boat about two years ago. The unit never shuts off when at anchor, only when motoring.