Dolphin Charger DC-DC Converter 12/36V 20A – Smart Marine Battery Booster (99204)

Power your auxiliary battery system efficiently with the Dolphin Charger DC-DC Converter 12/36V 20A, a high-performance marine booster designed to charge 24V or 36V battery banks from a 12V alternator while underway. Engineered for versatility and reliability, this smart DC-DC charger ensures your trolling motor or bow thruster batteries stay fully charged without relying on shore power.

Featuring an advanced multi-stage smart charging system, the Dolphin 99204 optimizes battery health and reduces charging time compared to traditional alternator charging. It supports multiple battery chemistries—including Lead Acid, AGM, Gel, and Lithium (LiFePO4)—making it ideal for modern marine electrical systems. 

Compact and efficient, this DC-DC converter delivers 20A output while maintaining a smaller footprint than conventional chargers. Built-in protection features guard against over-voltage, over-current, reverse polarity, and battery drain, ensuring safe and dependable operation in harsh marine environments. 

Key Features:

• 3-Stage Smart Charging: Operates as a true battery charger rather than a simple converter, providing Bulk, Absorption, and Float stages to ensure auxiliary batteries are fully topped off and maintained without overcharging.

• Multi-Chemistry Compatibility: Specifically engineered to work with 4 different battery technologies: Gel, AGM, Lead, and Lithium (LiFePO4).

• "On the Run" Recharging: Allows you to recharge your 36V trolling motor batteries while the main engine is running, eliminating the need to wait for shore power connections between fishing spots.

• Compact High-Efficiency Design: Utilizing advanced engineering, this booster is roughly half the size of conventional chargers with equivalent power outputs, making it ideal for tight engine rooms or console spaces.

• Industrial Protection: Features conformal-coated circuit boards for an extended lifecycle in saltwater environments, along with automatic protection against over-current, over-voltage, and reverse polarity.

• Converts 12V input to 24V or 36V battery systems

• 20A charging output for reliable onboard power

• Advanced multi-stage smart charging for faster, safer charging

• Compatible with Lead Acid, AGM, Gel, and Lithium (LiFePO4) batteries

• Charges auxiliary batteries while underway (no shore power needed)

• Compact, space-saving design

• Built-in protections: over-voltage, over-current, reverse polarity, and anti-drain

In The Box

• (1) Dolphin Charger DC-DC Converter - 12/36V - 20A

• Built-in Protection Fuses

• Quick Start Installation Guide

Installation Tip: For maximum efficiency, mount the booster in a vertical position to allow for natural convection cooling. Ensure you have at least 10cm (4 inches) of clearance around the housing. Since this unit is IP22 rated, it should be installed in a dry compartment protected from direct water spray or running water.

Applications:
Ideal for trolling motor batteries, bow thrusters, and auxiliary battery banks on boats requiring efficient onboard charging from a primary 12V system.

Why Choose Dolphin Charger?
Dolphin is a trusted name in marine power solutions, delivering advanced charging technology designed for durability, efficiency, and long-term battery performance in demanding marine environments.