Battery Epoch 48V 125Ah LiFePO4 Essential Series - Heated & Bluetooth & Victron Communication

Epoch 48V 125Ah Essential Series LiFePO4 Battery (6.4kWh)

The Epoch 48V 125Ah LiFePO4 battery stores 6.4 kWh of deep-cycle energy in one 51.2 V battery with internal heating, Bluetooth monitoring and native Victron CAN communication. It is built for 48V off-grid solar systems, RV and van house power, boat house banks in dry protected compartments, golf carts and backup power. Both communication cables are included in the box. Explore more options in our lithium marine battery collection.

Key features

• High capacity: 51.2 V, 125 Ah, 6.4 kWh (6,400 Wh nominal) in one battery.
• Strong output: 150 A continuous discharge (about 7,680 W DC before inverter losses), 300 A peak for up to 10 seconds.
• Victron ready: reports to a Cerbo GX or Ekrano GX over CAN-bus; with DVCC enabled, the battery sets the charge voltage and discharge current limits of Victron chargers. The integrated shunt supplies state of charge, so a separate battery monitor is not required.
• Both cables included: a battery-to-battery communication cable and a master battery-to-Victron GX CAN cable.
• Heated: internal heating pads allow charging from -30°C to 55°C (-22°F to 131°F).
• Bluetooth monitoring: state of charge, voltage, current, temperature and protection status in the free Epoch Li-Ion app (iOS and Android).
• 2A active balancing: keeps all 16 cells matched without user intervention.
• Long service life: 7,000+ cycles, maintenance-free, 11-year limited warranty.
• Scalable: up to 15 batteries in parallel (1,875 Ah, 96 kWh at 51.2 V).

Power for 48V inverter systems

At 51.2 V, 150 A equals about 7,680 W of continuous DC power before inverter losses. Size the system by the inverter's DC input current, not its AC output, and keep it within 150 A per battery. The 300 A peak rating covers start-up surges from inverters, motors and compressors for up to 10 seconds; any longer load must stay at or below 150 A. Set the inverter's low-voltage shutdown above the bottom of the operating range (41.6 V) so the inverter stops before the BMS disconnects the battery. Planning runtimes at 80% of nominal energy (5,120 Wh) are roughly 10.2 hours at 500 W, 5.1 hours at 1,000 W, 1.7 hours at 3,000 W and 1.0 hour at 5,000 W.

Cold-weather charging

When the cells reach 0°C (32°F), the BMS stops charging and sends the incoming charge current (at least 0.5 A from a connected charger) to the internal heating pads. The heater never uses the battery's stored energy, and charging resumes automatically when the cells reach 5°C (41°F). Leave the charger connected so the heater can work. Discharging works down to -20°C (-4°F) without heating.

Victron CAN, battery linking and Bluetooth

Batteries in a bank link through their RS485 ports and select a master automatically, with no DIP switches or addresses, so the GX device shows the whole bank as one battery. Make only one CAN connection per bank, from the CAN port of Battery 1 to the BMS-Can port of a Cerbo GX MK1, or to VE.Can 2 (set to 500 kbit/s) on a Cerbo GX MK2 or Ekrano GX. The Epoch Li-Ion app can also switch charging and discharging on or off independently.

Protection and build quality

The smart BMS protects against overcharge, over-discharge, over-current, short circuit and high or low temperature. It does not replace correctly sized fuses or breakers, and neither the POWER button nor the app is a means of isolation: open a DC disconnect or remove the battery cables for storage or service. The IP54 ABS case is dust-protected and splash-resistant, but it is not waterproof or submersible, so install it upright in a dry, protected location.

Technical specifications

Recommended charging settings

Program every charge source for a 48V LiFePO4 profile: bulk/absorption 56.8–57.6 V, float disabled (or 54.0–55.2 V), equalization and temperature compensation disabled. Never program a charge voltage above 57.6 V (the maximum charge voltage is 58.0 V), and never use lead-acid equalization or desulfation modes. Suitable sources include 48V LiFePO4 chargers such as the Epoch 48V 15A lithium charger, MPPT or PWM solar charge controllers with a programmable or LiFePO4 profile, DC-to-DC chargers for alternator charging, and inverter chargers that can be set to these values. With a Victron GX device and DVCC on, the battery's limits override the chargers' own absorption and float settings.

Installation notes

This is a deep-cycle battery, not a cranking battery. Use chargers, inverters, fuses and switches rated for a 48V (51.2 V nominal) LiFePO4 system, never connect it to 12V or 24V equipment, and do not wire it in series. The battery weighs about 110 lb (50 kg), so use two people or a lifting aid and lift by the end handles. Confirm that the compartment fits the case and leaves clearance above the terminals. When building banks, use matched batteries of the same age and state of charge, fuse each battery, and use equal cable lengths and gauges to the busbars. For boats, install in a dry, protected compartment in line with applicable marine electrical standards and the boat manufacturer's requirements. For long-term storage, charge to about 30–50% and check the state of charge at least every 3 months.

Need help choosing batteries, chargers or cables for your boat or off-grid system? Browse the full battery collection at M-Oceans or contact us for advice.