Guest On-Board Waterproof Battery Charger | 30A / 12V - 3 Bank (2731A)

The Guest 2731A is a high-efficiency, 3-bank on-board battery charger designed to power 12V, 24V, or 36V systems. Part of the ChargePRO series, it delivers a total of 30 Amps (10 Amps per bank), providing a fast and reliable charge for up to three batteries simultaneously.² This makes it an ideal choice for boats running a 24V trolling motor with a dedicated starting battery, or a full 36V trolling motor system.

Advanced Digital Charging Technology

The 2731A uses a fully automatic 5-stage charging algorithm (Analyze, Soft Start, Bulk, Absorption, and Maintain) that maximizes battery performance and life. Unlike older "trickle" chargers, this digital system precisely senses the state of each battery bank independently, ensuring that each battery—whether a Group 24 or a Group 31—gets exactly the charge it needs.

Key Features:

• 3-Bank Dedicated Charging: Outputs 10 Amps per bank, allowing for independent charging and sensing of three 12V batteries.⁶

• 100% Waterproof (IP67): Sealed in a low-profile, flangeless extruded aluminum housing that is completely shock-resistant and waterproof for both fresh and saltwater environments.

• Smart Maintenance Mode: Features an "Auto-Maintain" energy saver mode that keeps batteries at a full charge for storage without boiling off electrolytes.

• Wide Battery Compatibility: Optimized for all 12-volt Flooded (Lead-Acid) and AGM batteries.

• Lightweight Performance: Up to 40% lighter than previous generations, making it easier to mount in crowded bilges or storage lockers.

• Built-In Safety: Comprehensive protection against reverse polarity, over-current, over-voltage, over-temperature, and ignition hazards.

• LED Status Monitor: Expanded LED display provides real-time feedback on charging status and identifies wiring or battery faults for each bank.

Technical Specifications:

• Model Number: 2731A

• Total Output: 30 Amps (10A/10A/10A)

• Banks: 3

• DC System Voltage: 12V, 24V, or 36V configurations

• Input Voltage: 90–135V AC (50/60Hz)

• Dimensions: 9.0" x 8.7" x 4.1"

• Weight: 10 lbs

• AC/DC Cable Length: 6-foot pre-wired cables with in-line fuses

Why Choose the Guest 2731A?

The 2731A is the "sweet spot" for many mid-sized boats. It provides enough amperage to charge deep-cycle batteries quickly overnight while remaining compact enough for tight installations. It is specifically recommended for battery sizes ranging from Group 24 through Group 31 (up to 120Ah per bank).

Pro Tip for Installation:

Since the 2731A is pre-wired with 6-foot cables, check your battery placement before mounting. If your batteries are further than 6 feet away, you can extend the DC cables using a Guest DC Cable Extender Kit, which includes the proper gauge wire and waterproof connectors to prevent voltage drop.