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Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery - Off Grid Stores
by Epoch Batteries

Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery

SKU: 12334A-MC
$1,299.00 - $1,299.00
$1,299.00
$1,299.00
$1,299.00 - $1,299.00
$1,299.00
Availability:
in stock

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Off Grid Stores is an authorized retailer of Epoch Batteries products. Because of this, we pass on Epoch Batteries's manufacturer warranty to you.

Product Highlights
  • 12V 334Ah MC Essential Series LiFePO4 (4.28kWh): High-capacity heated deep-cycle house power for RVs, vans, off-grid cabins and solar banks, storing 4,275Wh (nominal) in one metal-cased battery built for dry, protected interior spaces.
  • VICTRON CAN COMMS: Speaks the Victron CAN-bus protocol. Wired to a Cerbo GX or Ekrano GX, the host battery becomes the controlling BMS and sets the chargers' voltage and current limits through DVCC. Batteries link over RJ45 patch cables and negotiate their host or node role automatically, with no DIP switches or addresses, and the GX shows the whole bank as one battery.
  • High-Output Power Delivery: 300A max continuous discharge (150A recommended for daily use) and 600A peak for up to 10 seconds for start-up surges. At 12.8V, 300A is about 3,840W of DC output before inverter losses, enough for a properly designed 3,000W-class inverter system. Accepts up to 300A continuous charge (167A recommended).
  • HEATED for Cold-Weather Charging: Charges from -20°C to 55°C (-4°F to 131°F) with its internal heating film. With a charger connected and the cells below 0°C (32°F), the heater warms them and the BMS holds off charge current until they are above 5°C (41°F), which can take up to 60 minutes. The heater runs only while a charger is connected.
  • BLUETOOTH Monitoring: The free Epoch Li-Ion app for iOS and Android shows state of charge, voltage, current, cell voltages, temperatures, heater status and protection history.
  • 2A Active Cell Balancing: Moves charge between the four cells across the full state-of-charge range to keep their voltages matched.
  • Smart BMS Protection: Built-in protection against overcharge, over-discharge, over-current, short circuit and high or low temperature.
  • Parallel Expansion, No Series: Up to 4 matched batteries in parallel are validated plug and play (1,336Ah / 17.10kWh); larger banks, up to 16 (5,344Ah / 68.40kWh), need Epoch design support. Series wiring is not approved for this model.
  • IP21 Indoor Metal Case: Powder-coated steel, 15.35 × 8.07 × 11.02 in (390 × 205 × 280 mm), 75 lb (34 kg). IP21 protects against fingers and vertically dripping water only: install it upright in a dry, protected interior space, never in engine bays, exterior bays or anywhere it can be sprayed or submerged.
  • 4,500+ Cycle Life & 11-Year Limited Warranty: No watering or acid service, backed by an 11-year limited warranty (3 years of free replacement, then 40% off MSRP on a replacement battery through Year 11; register within 90 days or keep your proof of purchase).
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Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery

Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery

RV · Camper · Van conversion lithium power

Epoch 12V 334Ah MC Essential Series RV Lithium Battery (4.28kWh) | Heated, Bluetooth & Victron CAN

A 12V 334Ah LiFePO4 battery designed for high-capacity van, camper, and RV energy systems that need serious output in a compact footprint.

The Epoch 12V 334Ah MC (model 12334A-MC) stores 4.28kWh (4,275Wh nominal) in one metal-cased battery, built for RVers, camper van builders, and off-grid users who want more boondocking power without sacrificing living space. With 300A continuous discharge, internal heating, Bluetooth monitoring in the Epoch Li-Ion app, Victron CAN communications, 2A active balancing, and a 75 lb, 15.35 × 8.07 × 11.02 in case, it is a high-capacity deep cycle battery for serious 12V power systems.

334Ah
Capacity
4.28kWh
Stored energy
300A
Continuous output
600A
10 sec peak
75 lbs
Battery weight
IP21
Indoor, drip resistant

Built for high-demand RV power systems

11-year limited warranty 3 yrs free replacement
Victron communications Cerbo GX & Ekrano GX ready
Bluetooth monitoring Epoch Li-Ion app
Internal heating Cold-weather charging
2A active balancing Cell-level stability
300A BMS Heavy-load output

Power Heavy RV Loads with a 300A Smart BMS

Run a properly designed 3,000W-class inverter system from one compact 12V lithium battery.

This 12V 334Ah LiFePO4 battery is built around a robust 300A continuous discharge rating, giving DIY builders enough output for serious inverter-based RV and van power systems. At 12.8V, 300A is about 3,840W of DC output before inverter losses, enough for a properly designed 3,000W-class inverter system. Size the system by the inverter's DC input current, not its AC output: it must stay within 300A, and Epoch recommends keeping daily loads at or below 150A.

The 600A peak discharge rating covers start-up surges of up to 10 seconds from appliances such as air conditioners, microwaves, and refrigerators; any load that lasts longer must stay at or below 300A. As always, inverter surge, wiring, fuse protection, ventilation, and charger settings must be designed correctly.

Four-Season Ready & Seamless System Integration

Automatic Internal Heating

An internal heating film lets the battery charge from -20°C to 55°C (-4°F to 131°F). When a charging source such as solar, shore power, or a DC-to-DC alternator charger is connected and the cells are below 0°C (32°F), the heater warms them and the BMS holds off charge current until they are above 5°C (41°F), which can take up to 60 minutes in deep cold. The heater runs only while a charger is connected.

Victron Comms & Bluetooth Monitoring

Wired to a Victron Cerbo GX or Ekrano GX over CAN-bus, the host battery becomes the controlling BMS and, with DVCC on, tells MultiPlus, MPPT, and Orion chargers what voltage and current to deliver. Batteries in a bank link over RJ45 patch cables and negotiate their host or node role automatically, so the GX shows the bank as one battery. Over Bluetooth, the free Epoch Li-Ion app shows state of charge, voltage, current, cell voltages, temperatures, and heater status.

Compact, Safe, and Built for the Long Haul

Built for dry interior RV and van installs, such as under-bed, dinette bench, and electrical cabinet power systems.

The 75 lb (34 kg) battery measures 15.35 in × 8.07 in × 11.02 in (390 × 205 × 280 mm) in a powder-coated steel case, making it a practical under-bed RV battery upgrade or cabinet-mounted battery bank for camper vans and off-grid RV conversions. Its IP21 rating covers fingers and vertically dripping water only, so it is for dry, protected indoor installation, not exposed exterior battery trays.

2A active balancing moves charge between the cells across the full state-of-charge range, while the 4,500+ cycle rating and 11-year limited warranty support long-term confidence for demanding mobile and off-grid electrical systems.

Compatible applications

RV, camper, van conversion, solar, and off-grid 12V power systems.

  • ✓ RV, camper, motorhome, travel trailer, and fifth-wheel house-power systems.
  • ✓ Camper van and skoolie electrical builds that need high capacity without wasting living space.
  • ✓ Under-bed RV battery upgrade projects, dinette bench installs, and interior electrical cabinets.
  • ✓ Inverter-based boondocking setups for air conditioners, microwaves, induction cooking, and residential refrigerators, within 300A continuous.
  • ✓ Off-grid van conversion and solar battery banks using lithium-compatible charge controllers and inverter chargers.
  • ✓ Victron Cerbo GX and Ekrano GX systems using CAN communications and DVCC.
  • ✓ Protected marine house-power installations and backup power.
  • ✓ Parallel 12V banks: 4 batteries validated, larger banks up to 16 with Epoch design support.

Battery features

High-output LiFePO4 performance with smart monitoring, heating, balancing, and Victron support.

334Ah / 4.28kWh capacity A high-capacity deep cycle battery that stores serious off-grid energy in one compact 12V package.
300A continuous discharge Supports demanding 12V loads and properly designed 3,000W-class inverter systems; 150A is recommended for daily use.
600A peak discharge Provides short-duration surge capability for up to 10 seconds to help handle appliance startup loads.
Internal heating Warms the cells below 0°C (32°F) while a charger is connected; charging resumes above 5°C (41°F), for a -20°C to 55°C charge range.
Victron communications Acts as the controlling BMS for a Victron Cerbo GX or Ekrano GX over CAN-bus with DVCC; banks link over RJ45.
Bluetooth app monitoring View state of charge, voltage, current, cell voltages, temperatures, and heater status in the Epoch Li-Ion app for iOS and Android.
2A active balancing Moves charge between cells across the full state-of-charge range to keep the four cells matched.
IP21 indoor use For dry, protected RV and van installation spaces such as under beds, benches, or cabinets. Not weatherproof or waterproof.
4,500+ cycle life Long-lasting LiFePO4 performance for repeated deep-cycle use in mobile and off-grid applications.
Parallel expansion Up to 4 batteries in parallel, validated plug and play; up to 16 with Epoch design support. No series wiring.
75 lb weight High capacity without the weight penalty of multiple lead-acid or AGM batteries.
11-year limited warranty 3 years of free replacement, then 40% off MSRP on a replacement battery through Year 11. Register within 90 days or keep your proof of purchase.

Compatible charging equipment

Use lithium-compatible hardware programmed for Epoch’s charging settings. Combined charge current from all sources must stay at or below 300A per battery.

✓ 12V LiFePO4 chargers, converters, and inverter chargers with a LiFePO4 or programmable profile
✓ Solar charge controllers (MPPT or PWM) with a programmable or LiFePO4 profile
✓ DC-to-DC alternator chargers for van and RV charging systems
✓ Victron systems with a Cerbo GX or Ekrano GX, where CAN comms let the battery set charge limits through DVCC

Why upgrade to Epoch LiFePO4?

More usable energy. Less weight. Smarter monitoring. Longer service life.

Compared with traditional lead-acid batteries, LiFePO4 technology provides more usable capacity, stable voltage output, fast charging capability, and maintenance-free operation. For RVers and van builders, that means more boondocking runtime, less battery-bank complexity, and far less space lost to multiple heavy lead-acid batteries.

Fitment and installation note

Verify your inverter, charger, wiring, and installation location before use.

Always confirm compartment dimensions, mounting location, cable clearance, terminal compatibility, fuse sizing, charger settings, inverter draw, and ventilation before installation. For large inverter systems, properly sized cables, bus bars, fuses, disconnects, and charge sources are essential. Use matched batteries within 0.05V of each other and balanced wiring for parallel battery banks. Mount the battery upright, torque the M10 terminals to 13–17 Nm (115–150 in-lb), and place a DC-rated main fuse or breaker within 18 in (45 cm) of the positive terminal

Specifications:

Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery
ELECTRICAL & SYSTEM
Model 12334A-MC
Series Essential Series
Battery type Heated deep cycle
Chemistry LiFePO4
Cell configuration 4S1P
Nominal voltage 12.8 V
Capacity 334 Ah
Stored energy 4.28 kWh (4,275 Wh)
Operating range 10.0–14.6 V
Max. charge voltage 14.6 V
Cycle life 4,500+ cycles
Bluetooth Epoch Li-Ion app, iOS / Android
Self-heating Yes
Victron communications CAN-bus (GX / DVCC)
Balancing 2 A active balancing
DISCHARGE & RUNTIME
Max. continuous discharge 300 A
Peak discharge 600 A for 10 s
Daily discharge 150 A recommended
Series / parallel Parallel only, max. 4P (16P w/ Epoch)
100 W / 500 W load ≈ 34.2 h / ≈ 6.8 h
CHARGE SETTINGS
Max. continuous charge 300 A
Recommended charge Up to 167 A (50%)
Bulk / absorption 14.2–14.4 V
Absorption time ≤ C/20 (16.7 A) or 15 min
Float 13.3–13.6 V (off preferred)
Re-bulk 13.2 V
Equalization Disabled
Temperature compensation 0 mV/°C (disabled)
BMS high-voltage cutoff 14.6 V
TEMPERATURE
Charge −4 to 131 °F (heated)
Discharge −4 to 140 °F
Storage 32 to 95 °F
Low-temperature charge Heater on below 0 °C; charging resumes above 5 °C
MECHANICAL
Dimensions 15.35 in × 8.07 in × 11.02 in
Metric dimensions 15.35 in × 8.07 in × 11.02 in
Weight 75 lb
Terminals M10 female, 13–17 Nm (115–150 in-lb)
Enclosure IP21, dry indoor only
BMS PROTECTIONS
Smart BMS Built-in management
Overcharge / over-discharge Protected
Over-current / short circuit Protected
High / low temperature Disconnect protection
COMPLIANCE & SUPPORT
Certifications UL 1642, UL 9540A, IEC 62619:2022
Compliance marks CE, RoHS
Transport UN 38.3, Class 9
Support US-based technical support

Frequently Asked Questions

Can I run my RV air conditioner with this single battery?

Yes, with a properly designed inverter system. The Epoch 12V 334Ah MC uses a heavy-duty 300A continuous BMS. At 12.8V, that is about 3,840W of DC output before inverter losses, enough for a properly designed 3,000W-class inverter system, and its 600A peak rating covers start-up surges of up to 10 seconds. Runtime depends on the load: planning on 80% of the battery's 4,275Wh (3,420Wh), a 1,000W load runs for about 3.4 hours and a 3,000W load for about 1.1 hours.

Does this battery integrate with my Victron system?

Yes. The 12334A-MC speaks the Victron CAN-bus protocol. Connect the host battery's CAN port to the BMS-Can port of a Cerbo GX or Ekrano GX with a straight-through RJ45 patch cable, select the CAN-bus BMS profile (500 kbit/s), turn DVCC on, and choose the battery (listed as DRIFT) as the controlling BMS. In a bank, run a patch cable from each battery's LINK B to the next battery's LINK A; the batteries negotiate their host or node role automatically, and the GX shows the bank as one battery. The BMS then sets the charge voltage and current limits for MultiPlus, MPPT, and Orion chargers.

Where should I install this battery in my van or camper?

Because this model is IP21 rated, it must be installed upright in a dry, protected interior location such as under a van bed, inside a dinette bench, in a dedicated electrical cabinet, or in a protected RV battery bay. It should not be installed in engine bays, exposed exterior locations, wet compartments, or areas where it may be sprayed, submerged, or covered by standing water.

Will the internal heater drain my battery while I am boondocking?

No. The heater runs only while a charging source is connected. When a charger such as solar, shore power, or a DC-to-DC alternator charger is connected and the cells are below 0°C (32°F), the BMS turns on the heater and blocks charge current until the cells are above 5°C (41°F), which can take up to 60 minutes in deep cold. With no charger connected the heater stays off, and the battery can still discharge down to -20°C (-4°F) without heating.

Can I wire these batteries in series or parallel?

Parallel only. Up to 4 matched 12334A-MC batteries in parallel are validated plug and play, for up to 1,336Ah (17.10kWh) at 12.8V; banks of up to 16 batteries need Epoch design support for fusing and busbars. Series connection is not approved for this model, so it must not be used to build 24V, 36V, or 48V systems. Charge each battery fully and bring them all to within 0.05V of each other before connecting them

How much space and weight will this save compared to lead-acid batteries?

This battery stores 4.28kWh in a single 15.35 in × 8.07 in × 11.02 in footprint and weighs 75 lbs. To get a similar amount of usable energy from traditional lead-acid or AGM batteries, you would typically need several 100Ah batteries weighing well over 200 lbs combined. This makes the 334Ah Epoch battery a major space and weight saver for vans, campers, and RVs.

What is 2A active balancing?

2A active balancing moves charge between the cells to keep their voltages matched across the whole state-of-charge range, not only at full charge. This helps a large-capacity battery stay consistent through repeated heavy inverter loads and deep-cycle use.

Is this a good battery for a 3,000W inverter?

Yes, when the inverter system is properly designed. At 12.8V, the 300A continuous rating is about 3,840W of DC input before inverter losses, enough for a 3,000W-class inverter. Size the system by the inverter's rated DC input current, not its AC output: it must stay within 300A, and Epoch recommends 150A or less for daily use. Wiring, fusing, inverter surge draw, charger settings, and ventilation should be sized by a qualified installer or experienced builder.

Product Documents:

Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery User Manual

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Epoch Batteries 12V 334Ah (4.28kWh) MC Essential Series LiFePO4 Battery Specification Sheet

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