Abyss Battery 36V On-Board Alternator Charger - AB-36V-DC
The essential boat upgrade that allows you to charge your 36V trolling motor battery from your engine’s alternator on the go! While underway, your alternator’s excess power redistributes from your starting battery so you get an extra boost, and better battery life for your trolling motor.
How it works: With state of the art technology, the ABYSS® On-Board Alternator Charger applies 10A of on-demand charging voltage to your 36V battery so it only receives the charging current it needs to replace energy that has been consumed. This smart charging system also works to ensure your cranking battery voltage will not fall below 13.3V, making it a safe and reliable way to keep your trolling motor or aux batteries charged and ready to go.
Features
- Charges 36V trolling motor batteries
- Utilizes engine's alternator power
- Smart on-demand charging technology
- Protects cranking battery, minimum 13.3V
- Ideal onboard boat battery charger system
What our Experts Think
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Engine-powered charging solution: The ABYSS® AB-36V-DC is designed to charge 36V lithium trolling motor batteries directly from your boat’s alternator, maximizing energy use while underway.
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Continuous on-the-go charging: Converts alternator output into a stable DC charge, helping maintain or replenish battery levels during long runs between fishing spots.
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Optimized for LiFePO₄ systems: Engineered with a lithium-specific charging profile to ensure safe voltage regulation and battery longevity.
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Smart power management: Prevents overcharging through integrated control logic, protecting both the alternator and the battery system.
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High-efficiency DC conversion: Minimizes energy loss during transfer, ensuring more usable power reaches the battery bank.
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Marine-grade durability: Built to withstand vibration, moisture, and saltwater exposure in demanding offshore environments.
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Seamless system integration: Designed for compatibility with ABYSS 36V lithium trolling motor batteries for plug-and-play style installation.
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Extended run-time advantage: Allows anglers to fish longer without shore power dependency, ideal for remote or multi-day trips.
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Thermal and electrical protection: Includes safeguards against overheating, short circuits, and voltage spikes for reliable operation.
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Performance-focused design: Ideal for serious anglers who want a self-sustaining power system combining alternator charging with high-capacity lithium storage.
Q&A
Q: What is the Abyss Battery AB-36V-DC used for?
A: A high-efficiency on-board alternator charger that converts engine alternator power into regulated charging for 36V LiFePO₄ trolling motor batteries while underway.
Q: How does the AB-36V-DC work?
A: It pulls excess alternator power from the boat’s starting system and delivers a controlled ~10A DC charge to the 36V battery, maintaining safe voltage and preventing overdraw on the cranking battery.
Q: What is the main benefit of this charger?
A: It charges your trolling motor battery while the engine runs, reducing shore charging needs and keeping batteries topped up during travel or fishing trips.
Q: What batteries is it compatible with?
A: Designed specifically for 36V LiFePO₄ marine/trolling motor battery systems.
Q: What is the output of the AB-36V-DC?
A: Around 43.8V DC output at up to 10A with high efficiency and stable regulation for lithium charging.
Q: Is it safe for marine use?
A: Yes, it features IP67 waterproof construction, ignition protection, and multiple safeguards including overcurrent, overvoltage, and reverse polarity protection.
Q: Can it protect the starting battery?
A: Yes, it is designed to prevent excessive drain and maintain cranking battery voltage (around safe operating thresholds during charging).
Q: What is the installation type?
A: Permanent on-board marine installation, wired between alternator/starting system and the 36V lithium battery bank.
Maintenance Tips
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Ensure correct system voltage: Designed for 12V alternator input → 36V LiFePO₄ output (~43.8V). Never connect to higher DC sources.
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Secure installation: Mount firmly in a dry, vibration-reduced area; marine vibration can loosen terminals over time.
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Check wiring regularly: Inspect input/output cables for heat marks, corrosion, or loose crimps—critical in high-current DC systems.
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Avoid overheating: Maintain airflow; unit is epoxy-sealed but still performs best under 40°C continuous ambient use.
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Battery compatibility: Only use with 36V LiFePO₄ systems with BMS—avoid lead-acid or mismatched chemistries.
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Monitor alternator load: Ensure your cranking battery stays above ~13.3V (unit auto-protects but check system health).
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No wet connector exposure: IP-rated housing resists water ingress, but connectors must stay dry and corrosion-free.
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Routine inspection (monthly): Check LED status, confirm 10A charging output, and verify no fault codes.
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Winter/storage care: Disconnect when boat is stored long-term to prevent parasitic drain or unintended cycling.
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System synergy tip: Pair with Abyss Bluetooth batteries to track real-time charge flow and detect alternator underperformance early.
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