Abyss Battery 48V125Ah Lithium Marine House Battery - AB-48V125

Abyss Battery  48V125Ah Lithium Marine House Battery - AB-48V125

Meet the house battery that lets you cruise, anchor, and sleep without the drone of a genset. Built around a 51.2V LiFePO₄ pack and a robust marine BMS, this 6.4 kWh module is purpose‑engineered for electric propulsion and high‑demand DC/AC house loads—then sealed to IP67 so it actually belongs on a boat. It also speaks Victron natively over CAN, so your inverter/charger and GX devices coordinate charge limits and currents automatically for a clean, alarm‑free system.

Why choose this battery?

• Generator replacement: Pair with a Victron inverter/charger and you’ve got quiet AC overnighting, galley loads, and thrusters without burning diesel. Victron‑protocol CAN comms coordinate CVL/CCL during charging and taper current as the pack fills—exactly how it should work on a yacht.
  

• Serious energy density: 51.2 V × 125 Ah = 6,400 Wh in a single module designed for parallel scaling. (Series connections are not supported; keep modules at the same voltage before paralleling.) 
  

• Marine‑ready build: IP67 enclosure, CE/UN38.3 compliant, with integrated BMS protections for over/under‑voltage, over‑current, temperature, and short circuit.
  

• Victron protocol compatible: CANBUS + RS‑485 on board for plug‑and‑play integration with Victron inverters/chargers and GX devices.
  

• Installer‑friendly: Clearly labeled IN/OUT, charger/motor comm ports, remote/wire‑control switch option, and busbar guidance—including fuse and gauge recommendations.

Specifications 

• Nominal voltage / capacity: 51.2 V / 125 Ah (LiFePO₄); Stored energy: ~6.4 kWh.

• Voltage range: ~40–57.6 V (CC/CV charging at 57.6 V). 

• Charge method/time: CC‑CV; typical full charge ≈ 4.5 h (standard).

• Cycle life: Long‑life deep cycle LiFePO₄ (manufacturer lists multi‑thousand‑cycle performance at 0.5C).

• Enclosure rating: IP67; Certs: CE, UN38.3.

• Dimensions (L×W×H): 650 × 360 × 210 mm; Approx. weight: ≈ 58.5 kg.

•  Comms: CANBUS & RS‑485; Victron protocol compatible. 

• System topology: Parallel‑only expansion; series not supported.

What it powers

• Electric outboards & pods (48 V class)

• Silent nights at anchor: air‑con (with inverter), galley, refrigeration, pumps, lighting

• High‑load DC systems: windlass, bow/stern thrusters (within BMS limits)

What our Experts Think      

• High-capacity marine house power: The ABYSS® 48V 125Ah Lithium Marine House Battery AB-48V125 is designed to deliver stable, high-output energy for full onboard electrical systems, including electronics, lighting, refrigeration, and accessories.
• Massive usable energy storage: With ~125Ah capacity at 48V, it provides long-duration off-grid power for extended cruising, liveaboard setups, and offshore applications.
• Efficient system consolidation: Replaces multiple lead-acid banks with a single high-density lithium unit, reducing weight, wiring complexity, and maintenance requirements.
• Stable deep-cycle performance: Engineered for consistent discharge over long periods, maintaining voltage stability for sensitive marine electronics and systems.
• Advanced LiFePO₄ chemistry: Built with a smart BMS (Battery Management System) that protects against overcharge, over-discharge, overheating, and short-circuit events.
• Marine-grade durability: Rugged, vibration-resistant construction with corrosion-resistant design for harsh saltwater environments and continuous marine use.
• High-efficiency energy delivery: Supports high inverter loads, making it suitable for powering AC systems, navigation gear, and onboard appliances.
• Long service life advantage: Rated for 3000+ cycles, offering significantly longer lifespan compared to traditional AGM or lead-acid house battery banks.
• Smart monitoring support: Bluetooth-enabled monitoring provides real-time insights into charge status, voltage, and system health for better energy management.

             
Q&A  

Q: What is the Abyss Battery 48V 125Ah AB-48V125 used for?
A: A high-capacity LiFePO₄ marine house battery designed for 48V systems, delivering stable, silent power for boats, yachts, and off-grid marine electrical loads.

Q: What are the key specifications of the AB-48V125?
A: 51.2V nominal (48V class), 125Ah capacity, ~6.4kWh energy storage, IP67 waterproof rating, and ~58.5kg marine-grade sealed construction.

Q: What makes it suitable as a marine house battery?
A: It’s engineered for continuous onboard power—running navigation systems, refrigeration, lighting, inverters, pumps, and AC loads without a generator.

Q: Does it support Victron or inverter systems?
A: Yes, it features CAN/RS485 communication for integration with Victron-style inverter/charger systems for smart charging control and system monitoring.

Q: What is the discharge performance?
A: Designed for high-demand loads with up to ~125A continuous discharge and strong surge capability for marine electrical spikes.

Q: How long does it last?
A: Built for multi-thousand cycle life (typically 2000–6000+ cycles depending on depth of discharge), far exceeding lead-acid batteries.

Q: Is it safe for marine environments?
A: Yes, it uses a sealed LiFePO₄ design with advanced BMS protection and IP67 waterproofing for harsh saltwater conditions.

                 
Maintenance Tips      

• Use correct charging profile: Charge only with LiFePO₄-compatible charger (CC/CV ~57.6V max). Avoid lead-acid or mixed-mode chargers.
• Avoid deep discharge: Keep state-of-charge above ~20–30% to reduce cell stress and extend cycle life.
• Temperature discipline:
• Charge: 0°C to 55°C (do not charge below freezing unless system heating is active)
• Discharge: down to −20°C safe range per BMS limits
• Storage best practice: Store at ~50–70% charge in a cool, dry, ventilated space for long idle periods.
• Monitor via CAN/BMS (if integrated): Track voltage, temperature, and current limits—especially important for Victron or inverter setups.
• Respect current limits: Avoid sustained loads beyond rated continuous discharge (~125A system design limit) to prevent BMS cutoffs.
• Terminal maintenance: Check torque on high-current connectors periodically; tighten to spec to avoid heating or voltage drop.
• Moisture & corrosion control: Even with IP67 sealing, avoid salt buildup on terminals—wipe down after marine exposure.
• System balance: If used in parallel banks, ensure identical voltage/state-of-charge before connecting.
• Regular cycling: Lithium performs best when used regularly—avoid leaving fully charged or fully depleted for long durations.