EG4 16kWh 314Ah 48V Indoor Wall‑Mount Lithium Battery

The EG4 WallMount 314Ah Indoor Battery is a 48V LiFePO4 wall-mount energy storage module rated at 16 kWh total capacity, designed for residential, commercial, off-grid, and backup power applications in clean, protected indoor spaces. Built on advanced lithium iron phosphate cells with an active-balancing smart BMS, auto-configuration, network connectivity, and over-the-air firmware updates, it is a meaningful step up from the EG4 WallMount 280Ah — delivering 12% more capacity in the same physical footprint while adding the BMS and commissioning upgrades that reduce installation time and extend long-term cell life. Available through A1 SolarStore as part of the EG4 battery 48V lineup.

Note: EG4 recommends a 20% SOC cutoff to maintain 80% depth of discharge. At this setting, usable capacity is 12.86 kWh — not the full 16 kWh total. Plan all runtime and load calculations around the 12.86 kWh usable figure.

Key specifications

• Nominal voltage / total energy capacity: 51.2V (48V system) / 16 kWh
• Capacity: 314Ah; usable energy at 80% DOD: 12.86 kWh
• Chemistry: LiFePO4 (lithium iron phosphate) — stable cathode chemistry with no thermal runaway risk associated with NMC or NCA cells
• Max. continuous discharge current: 200A; max. continuous charge current: 157A
• Continuous charge / discharge power: 8 kW / 10.2 kW; peak power: 12.8 kW (3 sec)
• BMS: Integrated smart BMS with active balancing (2–3A); 250A battery breaker; short-circuit protection at 1,700A with 15 ms delay
• Round-trip efficiency: 95%
• Charging voltage range: 56–57 VDC; discharge cut-off: 47.5 VDC
• Charge temperature: 32–122°F (0–50°C); self-heater activates at ≤32°F (0°C), off at ≥37°F (3°C); 448W heater at 56V
• Discharge temperature: -4–131°F (-20–55°C)
• Max. parallel units: 32
• Cycle life / design life: 10,000 cycles @ 0.5C / 80% DOD (70% EOL capacity); 10-year design life; lifetime production: 122.2 MWh
• Dimensions (H × W × D): 34.1 × 18.1 × 9.6 in. (865 × 460 × 245 mm); weight: 293.2 lbs. (133 kg)
• Communication: RS485 / CAN; LED status display; Degson quick connector / screw terminal
• Certifications: UL1973, UL9540A (Passed); UL9540 — see eg4electronics.com for supported configurations; ETL Listed
• Warranty: 10 years or 10,000 cycles (whichever comes first)

Active balancing and longer cell life

The 314Ah's smart BMS uses active balancing at 2–3A — roughly 17 to 25 times the current of the passive balancing systems found in the EG4 WallMount 280Ah and many competing wall-mount batteries. Higher balancing current means cell voltage differences are equalized faster during each charge cycle, reducing the cumulative stress that causes capacity fade over time. The result is a rated cycle life of 10,000 cycles at 80% DOD — 25% more than the 280Ah's 8,000-cycle rating — and a lifetime production figure of 122.2 MWh versus 82.6 MWh. For a system that will cycle daily, that difference compounds meaningfully over a 10-year installation.

Auto-configuration and faster commissioning

The 314Ah eliminates manual DIP switch setup entirely. The smart BMS automatically detects the connected EG4 inverter and configures communication parameters without installer input — no jumpers, no address assignment, no profile selection. Over-the-air firmware updates keep the BMS current without a service visit. Configurable NO/NC and 12V output ports provide built-in triggers for generator start signals, system alarms, or custom automation — functionality that typically requires an external relay module on batteries without this feature.

High discharge capacity and peak power

The 314Ah supports 200A maximum continuous discharge — 43% higher than the 280Ah's 140A ceiling — and a 12.8 kW peak power output for three seconds for motor-start loads such as well pumps, HVAC compressors, and other high-inrush equipment. Continuous discharge power of 10.2 kW at 51.2V covers most whole-home essential load panels without derating. The 250A integrated battery breaker provides overcurrent protection without an external fuse or breaker block.

Parallel scaling up to 32 units

Up to 32 units can be paralleled for a maximum bank capacity of 512 kWh total (411.5 kWh usable at 80% DOD) — a ceiling suited to light commercial BESS deployments as well as large residential off-grid arrays. The same physical footprint as the 280Ah means the 314Ah drops into existing rack or wall-mounting hardware designed for the earlier model, keeping retrofit and expansion projects straightforward without structural modifications.

Applications and inverter compatibility

• Whole-home backup: 12.86 kWh usable per module covers multi-hour essential load backup; paralleling expands runtime linearly.
• Off-grid solar: 1C charge capability (157A continuous) supports rapid recharge from daytime solar production.
• Residential and light commercial ESS: UL1973 and UL9540A listings support AHJ permitting across North America.
• Retrofit and expansion: Same H × W footprint as EG4 WallMount 280Ah — fits existing mounting without modification.

The smart BMS auto-detects and communicates with EG4 inverters via RS485 or CAN for plug-and-play closed-loop operation. For non-EG4 inverters, communication parameters can be configured manually. Charge parameters: bulk/absorption 56–57V, discharge cut-off 47.5V, recommended charge/discharge rate 0.5C.

Why choose the EG4 WallMount 314Ah Indoor?

The EG4 WallMount 314Ah Indoor makes the case for itself most clearly against the 280Ah it replaces: more capacity in the same footprint, active balancing instead of passive, 10,000 cycles instead of 8,000, a higher continuous discharge ceiling at 200A, configurable output ports for generator start and alarms, and auto-commissioning that eliminates DIP switch setup. The 10-year / 10,000-cycle dual warranty — backed by UL1973 and UL9540A certifications — makes it one of the more comprehensively warranted indoor wall-mount LiFePO4 batteries in the EG4 lineup. Available through A1 SolarStore for buyers building or expanding a certified 48V energy storage system.