ECO-WORTHY 12V 40A DC to DC Charger with MPPT,Solar Charge Controller and On-Board Battery Charger for Lithium Batteries, Gel, AGM, Charger for Solar Panel and Alternator, in RVs, Trailer, Boat,Yachts

【DC to DC Charger Function】Flexibly provide two charging methods for service batteries. One is by connecting the starter battery of a car's alternator, and the other is by connecting solar panels to charge home batteries. Provide proper charging for AGM/GEL, Lead acid, Lithium and Calcium batteries.
【Smart MPPT Charging】With built-in Maximum Power Point Tracking (MPPT), the DC-DC car charger will achieve high charging efficiency from solar panels at a suitable voltage. The MPPT solar energy intelligent control management system has a charging memory function that can record according to the user's charging habits.
【One-Way Charging】The addition of primary and secondary battery isolation achieves greater safety performance. In order to prevent the loss of power from the life battery, we have added one-way charging to prevent the life battery from back-charging and power consumption.
【Complete Protection Measures】It has multiple protection functions, including engine start battery low voltage protection, input and output reverse polarity protection, solar input overload protection, overcharge protection, short circuit protection, and over temperature protection.
【Easy To Use】There are wirings for solar panel, alternator and battery. Normal charging wiring will be indicated by light to better determine whether the connection is abnormal.