The SHARK™ MDX12-60 and MDX13-60 are smart, bi-directional DC-DC chargers engineered to optimize power flow between your starter battery (12V) and your high-voltage trolling motor battery (24V or 36V) — making them a vital part of the INFINITE™ Series Marine Power System.
This user manual provides detailed guidance on setup, operation, protections, and system integration to ensure safe and efficient charging in both directions.
? Bi-Directional Charging Logic
Boost Mode:
When your engine alternator is active, SHARK™ uses the 12V starter battery to charge your 36V or 24V trolling battery.Buck Mode:
When the engine is off, power flows back from the trolling battery to recharge the starter battery and support 12VDC onboard loads.Fully automated and software-controlled, with sleep mode that periodically checks charging conditions every 2 minutes.
⚙️ Smart Features
Up to 95.5% efficiency
Natural cooling, silent operation (no fans)
CAN-enabled for seamless integration with battery BMS
IP67 waterproof rating
LED status indicators for standby, charging, fault, and warning states
Compact, marine-grade aluminum housing
? Voltage Thresholds & Behavior
| Model | Boost Charging From | Buck Charging From | Default Output |
|---|---|---|---|
| MDX13-60 | 13.25V (start) | 36.0V (start) | 42.0V / 13.2V |
| MDX12-60 | 13.25V (start) | 23.33V (start) | 28.0V / 13.2V |
Auto wake-up voltage sensing
Power-off threshold: 10.5V (LV side), 31.5V / 21.0V (HV side)
Sleep mode consumption: ≤3mA
? Installation Best Practices
Ensure non-flammable mounting surface
Maintain 50mm clearance on all sides for passive heat dissipation
Match wire gauge and fuse rating to table specs
Never plug or unplug under load (sparks = damage!)
? LED Indicator Guide
Green (Fast Flash): Boost charging
Green (Solid): Buck charging
Green (Slow Flash): Standby
Yellow (Fast Flash): Warning
Red (Fast Flash): Fault
Off: Sleep or shutdown
Whether you're a professional installer or an advanced DIY user, the SHARK™ MDX ensures your dual-battery marine setup stays charged, protected, and intelligently balanced — no manual switching, no noise, no compromises.
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