The Orion is being used as a battery-to-battery charger between two isolated battery banks. Battery bank 1 is the boat’s primary house battery system. It is charged by a Suzuki 300AP while underway and a Noco 2 x 5 amp when docked. Battery bank 2 is a forward cabin only power supply (AC, hot water, inverter, interior lights, etc). It is charged by a 200W solar system and the Orion. I want the Orion to operate when either the boat is underway OR the shore-powered charger is turned on. It is critical that the Orion not attempt to charge Battery bank 2 when moored or anchored.
The system has a Cerbo GX but I don’t see any control options on that device.
You can use the engine detection method to turn the charger on/off depending on the voltage at the starting battery. So whether the engine is running or the shore power charger is charging, when the voltage is above resting voltage, the charger will turn on and charge the house batteries
Instructions and drawings are all in the Orion manual