also see here about settings . .
The Orion-Tr Smart DC-DC charger is a professional DC to DC adaptive 3-stage charger with built-in Bluetooth. For use in dual battery systems in vehicles...
www.victronenergy.com
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(Re)start level: The default setting (13.3V) is based on generic smart alternator setup. Most smart alternators will generate 13.5V when the engine is running, and regular alternators will normally generate >14V. In an application with a regular alternator the restart level can therefore be set to a higher value, e.g. 14V. Shutdown level: The default setting is 13.1V. this creates a hysteresis between the restart level and prevents excess discharge of the starter battery. Shutdown level range: 12|12; 12|24 models: 8 to 17V 24|12; 24|24 models: 16 to 35V Setup input voltage lock-out: Input voltage lock-out is the minimum level at which charging is allowed, below this level charging stops immediately. To determine this setting two criteria are important: • Minimum alternator voltage: A smart alternator can (temporarily) operate at very low alternator voltage (<12.5V) e.g. when the vehicle accelerates. This low voltage is allowed within the one-minute delay during the “engine on detection sequence 23”. If charging must remain active during this period, the lock-out level must at least be set below the minimum alternator voltage. Note: If this low voltage period exceeds the one-minute timer charging will be disabled on engine shutdown detection. • Voltage drop across the input cable: As seen in “engine on detection sequence 12”, VIN is lowered by Vcable due to the input current. The voltagedrop at Vin caused by Vcable must not trip the voltage lock-out. Therefore, the lockout value should be: Vlock-out = Valternator(min) – Vcable. Example, calculating input cable voltage drop: Distance between starter battery and charger: 5m. Valternator(min)= 12.5V. Recommended wire gauge: 16mm2 . Cable resistance: ~1.1mΩ/m @20°C, thus Rcable = 1.1mΩ x 10m (2x 5m) = 11mΩ1) . A 12|12-30A Smart Charger will draw about 35A from the input when running at full capacity, resulting in: Vcable = 11mΩ x 35A = 385mV. Vlock-out =< Valternator(min) – Vcable = 12.5V – 385mV ≈ 12.1V. The Restart value is normally set 0.1V higher than the Lock-out value to create hysteresis. 1) Cable connections, external fuses, temperature, etc. can influence cable resistance.