Epoch 12V 334Ah Essentials LiFePO4 Battery 12334A-H, Group 31, 4.28kWh, Heated, Bluetooth, IP54, RV and Marine House Battery
SKU: 12334A-H
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Product Summary
The 12334A-H puts 4.28kWh in a single Group 31 lithium battery, so one battery and one set of cables can replace several smaller ones in an RV, van, boat or solar bank. The IP54 case handles dust and splashes, the BMS measures its own current for the Epoch Li-Ion app, and up to four wire in series for 24V, 36V or 48V systems.
Specifications:
- 12.8V nominal, 334Ah at 0.2C, 4.28kWh (4,275Wh) of LiFePO4 storage, rated for 4,000+ cycles
- 200A continuous charge and discharge, 167A recommended, 400A peak for up to 3 seconds
- BCI Group 31 footprint at 10.0 × 7.63 × 13.75 in (H×W×D), 15.5 in long at the handles, 60 lb (27.2 kg)
- Internal heater for charging from -4°F to 131°F (-20°C to 55°C), powered only by incoming charge current
- Bluetooth monitoring in the Epoch Li-Ion app, with a built-in BMS shunt accurate to 0.2A on discharge
- Up to 4 in series (24V, 36V or 48V) and 16 in parallel, 4S16P maximum
- IP54 dust-protected, splash-resistant case with M8 threaded terminals, mounts upright
- Cells certified to UL 1642 and IEC 62619, 11-year limited manufacturer warranty
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About the Epoch 12V 334Ah Essentials Battery
This Group 31 lithium battery stores 4.28kWh, enough to retire a row of smaller batteries in an RV, camper van, boat or solar bank. With one battery, you have two terminals to look after and one set of cables to run. There are also fewer connections where resistance and heat can build.
The BMS reads its own current through a built-in shunt, accurate to 0.2A on discharge. So the current and state of charge in the Epoch Li-Ion app come from the battery itself, with no external shunt needed. An internal heater handles charging below freezing, and the IP54 case shrugs off dust and splashes in a dry compartment.
12334A-H vs. 12334A-MC: Which Epoch 334Ah Battery Fits
Epoch builds two 334Ah Essentials batteries with the same 4.28kWh, the same heater and the same app. This one is the compact, flexible pick. It has a Group 31 footprint, weighs 60 lb, uses an IP54 case and wires up to four in series for 24V, 36V or 48V. Its BMS handles 200A continuous with a 400A peak for up to 3 seconds, and monitoring runs over Bluetooth.
The Epoch 12V 334Ah MC (12334A-MC) is the pick for a 12V Victron system. Its steel case lives in dry interior spaces, and its BMS runs 300A continuous with 600A for 10 seconds. It talks CAN-bus to a Cerbo GX or Ekrano GX, so the battery sets the charge limits. It wires in parallel only. If your loads stay within 200A or your system runs above 12V, the 12334A-H is the one.
Running a 12V Inverter on a 200A Continuous Battery
At 12.8V, 200A continuous works out to about 2,560W of DC power before inverter losses. That covers a mid-size 12V inverter running a microwave, coffee maker or power tools. Epoch asks you to size loads, wiring and overcurrent protection to that 200A continuous rating. Epoch also asks you to treat the 400A peak as a 3-second allowance for motor, compressor and small welder start-ups. For bigger inverters, two batteries in parallel split the current.
Epoch calls for a fuse or DC-rated breaker as close as practical to the positive terminal. Size it to protect the smallest wire in the circuit. A Class-T fuse in a Blue Sea Systems fuse block makes a compact main fuse for a battery this size.
Series Banks for 24V, 36V and 48V Systems
The 12334A-H wires up to four in series. Two make a 25.6V, 8.55kWh bank, three make 38.4V and 12.83kWh, and four make 51.2V and 17.10kWh. That makes it a flexible building block for a 24V van, a 36V trolling motor bank or a 48V solar system. Up to 16 can also run in parallel at 12V, with 4S16P (64 batteries) as the ceiling.
Every battery in a bank has to match: same model, age, firmware and state of charge. Don't mix in lead-acid or other models. Charge each one fully before joining them, and make connections with everything switched off. Fuse each string and keep cable lengths equal. Rate every fuse, breaker and charger for the full bank voltage, since series banks climb past touch-safe levels.
Charging Below Freezing With the Built-In Heater
Below 32°F (0°C), the BMS pauses charging and sends the incoming current to internal heating pads. Once the cells reach 41°F (5°C), charging picks back up on its own. The heater needs at least 0.5A from a connected charger and never draws on stored energy. So a battery sitting in a cold rig keeps its charge. Epoch tests the heating system to -4°F (-20°C) and rates it for ambient temperatures down to -40°F (-40°C).
Installing the 12334A-H: Tray, Cable and Charging
Epoch calls for an upright install in a clean, dry, ventilated spot. Secure it with a tray, strap or bracket rated for 60 lb. The Epoch battery tray made for the 12300A-H, 12334A-H and 12314-ECO holds it in place. Epoch's warranty requires a secured battery, so plan the hold-down along with the battery.
The M8 terminals torque to 8 to 12 Nm (71 to 106 in-lb). When several wires need the same terminal, use a busbar. Our custom battery cables are made to order from 6 AWG to 4/0 AWG. The run from battery to fuse to busbar arrives at the lengths you need.
Any 12V LiFePO4 charger, converter, inverter-charger or solar charge controller works when set to the charge settings in the FAQ. For alternator charging, Epoch highly recommends a DC-DC charger to protect both the alternator and the battery. The Victron Orion XS handles that on a 12V system.
Our team is happy to help with sizing your bank, cables and fuses.
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Frequently Asked Questions
No. Epoch rates it as a deep-cycle battery, not a cranking battery. Engine starting falls outside the warranty.
For one battery that starts the engine and runs house loads, look at Epoch's Pro Series 12V 300Ah dual purpose battery.
The case base matches the BCI Group 31 footprint at 13.75 in long and 7.63 in wide. But the handles bring the length to 15.5 in, and the terminal bolts bring the height to 10.5 in.
Measure your box or tray against those numbers. Leave room above the terminals for cable bend radius and boots, and confirm your hold-downs before you order.
Yes, in a dry, ventilated compartment. Epoch lists marine house power among its uses.
Keep it out of bilges and anywhere water can pool around the case or terminals, and keep the pressure washer away. It isn't rated for submersion.
Add a Victron SmartShunt. Epoch documents Bluetooth monitoring only for this model. A shunt on the negative side gives your Cerbo GX state of charge, current and history for the whole bank.
Use a LiFePO4 profile, or enter these values. Set bulk and absorption to 14.2 to 14.4V, and end absorption at 16.7A (C/20) or 15 minutes. Set float off or 13.3 to 13.6V, re-bulk at 13.2V, temperature compensation at 0 mV/°C and equalization off.
Keep combined charging from solar, grid and alternator within the 200A continuous limit. The recommended rate is 167A. Lead-acid, AGM and gel profiles, desulfation and repair modes are off-limits.
Epoch's 11-year limited warranty covers defects in materials and workmanship for the original purchaser. Register within 90 days of purchase for full coverage. If you don't, coverage starts from the manufacturing date.
Common exclusions include unsecured mounting, mixed bank components, water exposure and engine starting. Storing the battery uncharged for more than three months is excluded, too.
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