One Charger, Two Directions: The SHARK™ Bi-Directional DC-DC Charger

Smart Power. Anywhere You Go.

If you’ve ever spent a long day fishing offshore or chasing bass on the lake, you know the frustration: your trolling motor batteries drain faster than expected, your house battery struggles to keep up, and when it’s time to fire up your outboard to head home—you’re crossing your fingers that the starter battery isn’t flat.

For decades, boaters have been stuck with complicated, inefficient power setups. Multiple batteries, heavy banks of lead-acid, separate chargers, and a mess of wiring have been the “normal” way to keep things running. But normal isn’t good enough when you’re out on the water.

That’s why Abyss Battery® developed the SHARK™ Bi-Directional DC-DC Charger (Model MDX13-60)—a marine-grade solution that simplifies your entire system by making power flow both ways. With the SHARK™, you can charge your high-voltage trolling motor batteries from your outboard, or send energy back to your 12V starter battery when it needs support. No wasted potential. No dead batteries. Just seamless energy management.

The Problem with Old Marine Power Systems

Most boats are set up with two distinct systems:

• 12V starter/house system: Powered by the outboard alternator, responsible for cranking the engine and often running electronics like lights, pumps, and electronics.

• 24V or 36V trolling motor system: Dedicated deep cycle batteries that power your motor for hours of quiet maneuvering.

Here’s the issue: these systems don’t talk to each other. Your outboard can only recharge your 12V battery bank, leaving your 24V or 36V trolling batteries to run down all day with no way to replenish them until you’re back at the dock.

That disconnect creates some big problems:

• Uneven Energy Use: Your 12V starter battery may stay topped off, while your trolling batteries are drained to nothing.

• Extra Batteries and Chargers: Boaters add larger house batteries or multiple chargers just to bridge the gap.

• Weight and Complexity: More batteries mean more weight, more space consumed, and more wiring.

• Risk of Stranding: If your starter battery gets low and your trolling batteries are full, you still can’t get power where you need it.

Why Bi-Directional Charging Matters

Bi-directional charging solves all of those problems by letting power flow in both directions.

• Boost Mode (12V → 24V/36V): When your outboard is running, SHARK™ boosts 12V alternator power up to 42V and pushes it into your trolling motor bank. That means every run between fishing spots is also charging time.

• Buck Mode (36V → 12V): When your starter battery needs support, SHARK™ reverses direction and pulls from your trolling bank, converting down to 13.2V to keep your outboard battery safe and ready to crank.

• Smart Sleep Mode: When neither side needs charging, SHARK™ powers down into low-consumption standby, preserving energy.

This kind of intelligent energy management eliminates wasted potential and makes your boat’s batteries work as one connected system instead of two isolated silos.

Key Features of the SHARK™ MDX13-60

✅ Bi-Directional Charging Functionality
• Converts 12V → 24V/36V to charge trolling motor batteries
• Sends 36V → 12V to recharge your starter battery

✅ Fast, Efficient Power Conversion
• 720W output (12V 60A) for rapid charging
• Fully charges a 36V 20Ah battery in as little as 1 hour

✅ Smarter Battery System Design
• Reduces or eliminates the need for house batteries
• Lowers cost, weight, and complexity of marine power setups

✅ Marine-Grade Durability
• IP67 waterproof, die-cast aluminum housing
• Vibration-resistant quick-connect terminals
• Natural air-cooled for silent, reliable operation

✅ Seamless System Integration
• CAN + RS485 communication for monitoring and control
• Ideal for pairing with Abyss Infinite Series batteries and the CRYSTAL® X3 Monitor

Technical Specs at a Glance

• Model: MDX13-60

• Input Voltage (LV): 10.5–16V (max 60A)

• Input Voltage (HV): 31.5–48V (max 25A)

• Boost Output Voltage: 42.0V

• Buck Output Voltage: 13.2V

• Efficiency: ≥95.5% peak / ≥94.5% full load

• Protection: Over-voltage, over-temp, short-circuit, thermal derating

• Cooling: Natural convection (silent operation)

• Size: 222.8 × 175.4 × 74.5mm

• Weight: 2.5kg (5.5lb)

• Certifications: CE, FCC, IP67 waterproof rating

Real-World Angler Scenarios

Tournament Offshore Angler
You’re chasing mahi offshore with your trolling motor holding you steady over reefs. After hours of action, your trolling batteries are drained—but thanks to SHARK™, every run back to reset your drift has been quietly recharging them. By the time you’re ready to move spots again, you’ve regained enough juice to keep fishing instead of heading home.

Bass Fisherman on a Lake
You’ve been running electronics, live wells, and spot-lock all day. Normally, your starter battery would be stressed, especially after long periods without running the outboard. With SHARK™, your trolling batteries backfeed into the 12V system, giving you confidence that your outboard will crank every time.

Weekend Boater Downsizing Weight
Instead of carrying a massive 12V house battery and a separate charger, you run a leaner setup. SHARK™ balances the system so you save space, cut weight, and still have redundancy.

The Abyss Advantage

What makes the SHARK™ stand out isn’t just the specs—it’s how it integrates into the bigger Abyss Infinite Series ecosystem.

• SEAL® Batteries: High-capacity 36V trolling motor solutions designed to pair perfectly with SHARK™.

• CRYSTAL® X3 Monitor: Real-time energy tracking, CAN communication, and full system oversight.

• Marine-Grade Build: Saltwater-ready, vibration-resistant, and engineered for offshore reliability.

With SHARK™, your boat’s electrical system is no longer a patchwork of isolated batteries—it’s a connected, intelligent power network.

Final Word

Marine power has always been a compromise: heavy banks of batteries, complicated wiring, and wasted energy. The SHARK™ Bi-Directional DC-DC Charger changes all of that by letting energy flow where it’s needed most, whether that’s recharging your trolling motor bank on the run or keeping your starter battery alive when it matters most.

It’s fast, efficient, rugged, and built for the realities of saltwater and freshwater anglers alike.

Take control of your onboard energy with SHARK™—the most advanced marine-grade bi-directional charger on the water.