Samlex 50A Battery Charger - 12V - 2-Bank - 3-Stage w/Dip Switch & Lugs - Includes Temp Sensor

The Samlex 50A Battery Charger – 12V – 2-Bank – 3-Stage with Dip Switch and Lugs is a professional-grade marine charging solution engineered for boats, RVs, and dual-battery systems that demand reliable, multi-stage charging of 12-volt lead-acid batteries. This fully automatic three-stage charger handles all battery types—flooded, AGM, and gel-cell—from standard 120V or 230V AC sources, delivering the precision charging that offshore and weekend boaters alike depend on to keep power systems healthy and ready for hours on the water.

The 50-amp output capacity powers two independent battery banks simultaneously, making this dual-bank charger ideal for vessels with separate cranking and house batteries. A DIP switch allows conversion to a two-stage charging algorithm for systems running DC loads (DC UPS operation), providing flexibility for different vessel configurations. The included temperature sensor monitors charging conditions and automatically adjusts the charge curve to prevent overcharging in heat or incomplete charging in cold conditions—a critical feature for extended offshore runs or storage in varying climates. Pre-assembled lugs simplify installation on battery terminals.

This charger addresses the core challenge of maintaining multiple 12V battery banks on mid-size vessels and RVs without manual monitoring. Serious anglers running overnight runs, liveaboards managing house and emergency systems, and boat owners storing vessels seasonally all benefit from the three-stage algorithm, which minimizes sulfation, extends battery life, and ensures full charge before departure. The ability to configure charging stages via DIP switch means one unit adapts to evolving system needs without replacement.

Marine-grade dual-bank battery chargers in the 50-amp class are the standard for commercial and serious recreational fleets. Samlex America's SEC-1250UL positions itself as a workhorse solution for users who cannot afford downtime due to undercharged batteries. The 11-pound unit fits compact engine rooms and galley spaces, while the compact dimensions ensure compatibility with standard marine electrical enclosures.