20a 12v DC to DC Battery Charger w/ Inbuilt Solar PWM Camper Van Motorhome Boat. 12V 20Amp DC to DC Dual Battery Charger With Built-in Solar MPPT Fit for Multiple battery types: AGM, GEL, Flooded, and Lithium, Idea for Caravan Camper Van Motorhome Boat. This powerful, high-quality battery to battery charger can charge a 12V battery from another 12V battery with its own power source, or from a solar panel using its built-in solar input PWM charge controller, at up to 20A. The fully-automatic battery charger uses an intelligent, multi-stage charging program that can be set to a wide variety of battery types using easy, one-button programming and features a full suite of electronic protections. This system is ideal for caravans, campervans, motorhomes or boats, where the alternator charging can be shared between the starter and leisure batteries while the engine is running, then the leisure battery can be kept topped up from solar power while the vehicle is parked. By combining two chargers into one unit the set-up and operation are made simple, allowing you to easily share an existing charging source between two batteries or battery banks and utilise solar power to extend your off-grid runtime. Charge the leisure battery in two ways. DC Input from the (smart) alternator and the start battery or DC Input from the Solar Panel. Compatible with both conventional and smart alternators. (Euro5/6 Vehicle with variable output voltage). Compatible with Multiple battery types. AGM, GEL, Flooded, and Lithium. Solar panel regulator with Maximum Power Point Tracking. Bulk, Boost, and Float. Automatic battery separator works without the need for diodes or VSR relays. Starter battery maintenance charging when your service battery is fully charged. Battery isolation, over-voltage protection, battery temperature protection, over-current protection, overheat protection, reverse current protection, solar panel and alternator reverse polarity protection. With a soft-start charging program and a minimum output battery voltage of only 2.5V, this charger is capable of recovering batteries from extremely high depth of discharge. To show target battery charging stage, power source and selected battery type. Battery input voltage: 12.5 – 16.0V. Maximum charging current: 20A. Solar input voltage: 16.0 – 25.0V. Maximum solar input current: 20A. Minimum output battery voltage: 2.5V. Bulk charge voltage: 14.3V (AGM/Gel), 14.0V (Lead Acid), 15.0V (Calcium), 14.0V (Li-ion). Float charge voltage: 13.5V. Float charge current: 100mA. Battery capacity: 18 – 250Ah. 1x dc to dc charger. We appreciate your business and strived to improve our customer service and our commitment to quality.