Smartpass 120 is a fully automatic 120A energy management system designed to prioritize, control, and maximize the energy supply of the service battery through the alternator. The system ensures a safe automatic separation of the starter battery and the service battery. Additionally, it guarantees energy distribution between the starter battery, service battery, and onboard consumers without the use of traditional diodes or VSR relays. This way, Smartpass 120 ensures that critical functions such as the starter, emergency lighting, and radio and communication systems are always adequately powered and take priority over non-critical functions.