With the exclusive two-way charing design, two REGO battery chargers can be connected in parallel, and get energy from the starter battery and 12V DC generator at the same time to charge the same house battery. The extra energy sources allow you to obtain extremely stable energy with a shorter charging time and adapt to more diverse usage scenarios. To ensure that the battery charger can work properly, it is recommended that the input power supply current should be 1.5 times that of the charger. For the 60A battery charger, the current of the generator should be at least 90A.