ProMariner ProSport 20 Heavy Duty On-Board Marine Battery Charger 20 Amp 2 Bank Electronics Accessories Promariner ProSport 20 Generation 3 Heavy-Duty Recreational On-Board Marine Battery Charger has a 12 Volt, 24 Volt output with a 20 Amp capacity providing 2 Banks for maximum performance. ProSport is 100% waterproof and shockproof, weighing 40% lighter than older technology epoxy filled chargers providing cooler operation and greater reliability. ProSport Distributed-On-Demand Charging technology, taking 100% of the available charging amps and distributing them to any one or combination of all batteries as needed for faster charging while extending the life of your batteries. ProSports Energy Saver Mode will monitor and Auto Maintain batteries which would significantly reduce AC power consumption, lowering operating costs and maximize reserve power performance. ProSports Advanced technology eliminates time consuming troubleshooting by clearly indicating system and battery connections are OK or if a fault is present on a specific battery bank.