3 bank x 10 amps for a total of 30 amps total output. Our digital on-board chargers are engineered with a micro-processor-based design to protect your battery, charge faster and help you stay on the water longer. Monitors temperature and state-of-charge. Enhanced status codes display charge stage, maintenance mode status, any error notifications and full charge. Automatic shut-off feature extends battery life by shutting down when charging is complete. Mounts conveniently in the battery compartment.