Epoch 12V 300Ah Lithium Battery, Essentials 12300A-H, Heated, Bluetooth, Group 31, 3.84kWh LiFePO4
SKU: 12300A-H
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Product Summary
The Epoch 300Ah lithium battery gives your van, RV or boat a 3.84kWh house bank in one Group 31 case, with just one pair of terminals to wire. It runs 200A continuous for 12V inverters in the 2,000W to 2,400W class, warms its cells before it charges in the cold, and tracks every amp with a built-in Bluetooth shunt.
Specifications:
- 300Ah at 12.8V nominal, 3.84kWh (3,840Wh) of stored energy
- 200A continuous discharge (150A recommended) with a 400A peak for up to 3 seconds
- Accepts up to 200A continuous charge, with 100A recommended
- Rated for 4,000+ cycles
- Internal heater runs on charger current, so it charges from -4°F to 131°F (-20°C to 55°C)
- Bluetooth monitoring in the Epoch Li-Ion app, read from a BMS shunt accurate to 0.2A on discharge
- BCI Group 31 case, 10.0 x 7.63 x 13.75 in (H x W x D), 15.5 in long at the handles, 58 lb (26.3 kg), M8 bolt terminals
- IP54 rated, UL 1642 and IEC 62619 certified cells, up to 4S4P, 11-year limited warranty
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About the Epoch 12V 300Ah Essentials Battery
Three 100Ah batteries mean three sets of terminals, a handful of interconnects and a bank to keep in balance. The Epoch Essentials 300Ah stores the same 3.84kWh behind one positive and one negative. One BMS manages the cells, and one Bluetooth readout covers the whole bank.
It's rated for 200A continuous both ways, in and out. The battery takes up to 200A from all your charging sources combined, and 100A is recommended. Solar, alternator and grid charging can share the work within that limit. With an internal heater, a 4,000+ cycle rating and an 11-year limited warranty, it's a house battery you can plan a whole build around.
Group 31 Lithium Battery Fit: Measure to the Handles
The 12300A-H uses a BCI Group 31 footprint: 13.75 in long, 7.63 in wide and 10.0 in tall at the case. Two numbers matter more than the case size, though. The handles stretch the length to 15.5 in, and the terminal bolts bring the height to 10.5 in. Measure your tray, hatch and cable path against those figures before you order.
At 58 lb, it needs a tray, strap or bracket rated for the weight so it can't slide or tip. Epoch sells a tray sized for this battery. Moving from an older lead-acid or AGM setup? Check cable size, fusing and charger profile as part of the swap, since Epoch notes the battery isn't a drop-in for every installation.
Inverter Sizing for a 12V 300Ah Battery
At 12.8V, the 200A continuous rating works out to about 2,560W of DC power before inverter losses. Epoch puts a single 300Ah in the 2,000W to 2,400W class of 12V inverter systems, with cabling, fusing and load management to match.
Surges from a compressor start, a microwave or a small welder draw on the 400A peak, which this model holds for up to 3 seconds. Size your wiring and overcurrent protection to the 200A continuous rating, not the peak. Planning a bigger inverter or a parallel bank? Our team is happy to help with sizing.
Charging the 300Ah from Alternator, Solar and Grid
Any lithium-compatible charger, solar charge controller or inverter-charger works with the 12300A-H once you program it with the manual's LiFePO4 settings. For solar, check that the array's open-circuit voltage suits the bank before you connect it.
For alternator charging, Epoch highly recommends a DC-DC charger programmed for LiFePO4. In a van or truck camper, the Victron Orion XS DC-DC charger handles that job on 12V systems.
Cold weather takes care of itself. Below 32°F (0°C), the BMS pauses charging and sends charger current (0.5A or more) to internal heating pads. At 41°F (5°C), it starts charging again. The heater never draws on stored energy, so it can't drain a parked battery.
Wiring and Fusing the 12300A-H
Epoch recommends installation by a qualified professional. The job comes down to four things: secure the battery, fuse the positive, size the cables and add a proper disconnect.
Put a fuse or DC-rated breaker as close as practical to the positive terminal. It should be rated for the system voltage and sized to protect the smallest wire. For main battery protection, use a Class-T fuse in a Blue Sea Class-T fuse block at the positive terminal.
Size the cable for 200A continuous, your run length and voltage drop. Our custom battery cables are made to order from 6 AWG to 4/0 AWG, cut to your layout. Torque the M8 terminal bolts to 71 to 106 in-lb (8 to 12 N·m).
The charge and discharge switches in the app are everyday controls, not a service disconnect. A Victron battery switch rated for 275A gives you a true off position for maintenance.
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Frequently Asked Questions
The manual lists a LiFePO4 profile with bulk and absorption at 14.2V to 14.4V. That stage ends when charge current drops to 15A or after 15 minutes, whichever comes first. Float is best left off, or set it to 13.3V to 13.6V if your charger needs one.
Re-bulk is 13.2V, temperature compensation is 0 mV/°C (off), equalization is disabled, and maximum charge voltage is 14.6V. Never use a lead-acid, AGM or gel profile.
Yes. Epoch allows up to four in series (51.2V nominal, the 48V class) and up to four in parallel (1,200Ah at 12V). That's a maximum of 16 batteries in a 4S4P bank.
Use only matched 12300A-H batteries of the same age, firmware and state of charge, and charge each one fully before connecting. Make every connection with chargers, loads and disconnects off. Chargers, inverters, fuses and switches must all be rated for the full bank voltage.
Keep it upright. Epoch's manual calls for upright installation unless Epoch documents for this exact model allow another position. The 12300A-H documents list no other option.
It's rated IP54, so it's dust protected and splash resistant, but it isn't submersible. On a boat, mount it clear of bilge water and spray. If the battery has to handle standing water, Epoch's V2 Elite batteries carry an IP67 rating.
No. Epoch builds it as a deep-cycle battery and doesn't rate it for cranking. Keep a cranking-rated battery on the starter unless Epoch confirms it works with your specific engine.
The BMS disconnects at 10.0V and reconnects at 12.0V. Epoch lists 11.2V as the inverter and load cutoff, so set your inverter's low-voltage disconnect with that number in mind.
If the battery does shut down, disconnect the loads, measure voltage at the terminals and recharge with a LiFePO4-compatible charger. Never connect another battery across the terminals to force a wake-up. Recharge promptly, too, because Epoch warns that a battery left discharged for a long time may not recover.
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