EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS18

$7,860.00

SKU# K0286-V

Introducing the WallMount 314Ah Batteries!

Meet the EG4 WallMount 314Ah AllWeather Battery — a high-capacity, outdoor-ready energy storage unit built for installs where space, weather, and long runtimes all matter. Delivering 16kWh at 51.2V, it’s designed to be a dependable backbone for solar-plus-storage, off-grid power, or whole-home backup setups that need serious capacity with straightforward expandability.

Meet the EG4 WallMount 314Ah AllWeather Battery — a high-capacity, outdoor-ready energy storage unit built for installs where space, weather, and long runtimes all matter. Delivering 16kWh at 51.2V, it’s designed to be a dependable backbone for solar-plus-storage, off-grid power, or whole-home backup setups that need serious capacity with straightforward expandability.

At the core are lithium iron phosphate (LiFePO₄) cells paired with EG4’s smart BMS for stable performance and long service life, plus active cell balancing to help keep the pack operating efficiently over time. The enclosure is purpose-built for exterior placements with an IP67 rating, and internal heaters support reliable operation when temperatures drop. For day-to-day ownership and long-term maintenance, Bluetooth + Wi-Fi connectivity enables live status checks and over-the-air firmware updates through the EG4 app—so the system stays current without hassle.

Why it stands out

  • Big usable capacity: 16kWh (314Ah) for extended runtime and stronger backup coverage
  • True outdoor protection: IP67 enclosure built to handle dust, water, and harsh conditions
  • Smarter control: EG4 smart BMS with active cell balancing for better efficiency and longevity
  • Connected ownership: Bluetooth/Wi-Fi monitoring + OTA updates via the EG4 app
  • Cold-weather confidence: Built-in heaters for reliable performance in colder climates
  • Simplified scaling: Auto-addressing and closed-loop integration with EG4 inverters/batteries

Best-fit applications

A strong choice for residential and light commercial solar storage, outdoor battery banks, off-grid power systems, and backup power where durability, monitoring, and easy expansion are priorities.

Core specifications (at a glance)

Weight: 309 lbs

Nominal Voltage: 51.2V

Energy Capacity: 16kWh

Charge Capacity: 314Ah

Max Parallel (closed-loop): Up to 32 batteries

Certifications: UL 1973; UL 9540 with Flexboss21 & Flexboss18

Design Life: Tested 10,000+ cycles @ 80% DoD

Dimensions: 34.6″ × 21.7″ × 9.3″

https://youtu.be/piXdWAx8aus">https://youtu.be/piXdWAx8aus

 

Battery Downloads

SKU#:K0286, K0287, K0288, K0289, K0290, K0221
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
Quick Start Guide:DownloadDOWNLOAD
UL9540 Certificate:DownloadDOWNLOAD
UL9540A Certificate:DownloadDOWNLOAD
UL1973 Certificate:PENDING
UN38.3 Certificate:PENDING

Battery Specifications

Product Type:LFP Battery
Battery Type:Lithium Iron Phosphate (LFP)
Model Number:WM48314AWXX (XX is a number between 00 – 99)
Nominal Energy Capacity:16kWh
Usable Energy (DOD%):12.86kWh (80% recommended)
Voltage Range:47.5 – 57.6 VDC
Nominal Voltage:51.2 VDC
Capacity:314Ah
Charging Voltage Range:56 – 57 VDC
Discharging Cut-off Voltage:47.5 VDC
Max Continuous Charge Current:157A
Max Continuous Discharge Current:200A
Continuous Charge/Discharge Power:8/10.2 kW
Recommended Charging/Discharging Rate:0.5C
Peak Power:12.8kW (3 sec)
Round-trip Efficiency:95%
Max Parallel Units:32
Protection Features:Over/Under Voltage, Over-Current, Short Circuit, High/Low Temp
Battery Management System (BMS):Integrated, Active Balancing
Communication Protocols:RS485, CAN
Battery Breaker:250A
Storage Temperature Range**:-4 – 131°F (-20 – 55°C)
Humidity Range:5% – 95% RH (non-condensing)
Altitude:9843 ft. (<3000 m)
Cooling Method:Natural Convection
Dimensions (H × W × D):34.6 in. × 21.7 in. × 9.3 in. (880 mm × 550 mm × 235 mm)
Operating Temperature Range:Charge: 32 – 122°F (0 – 50°C); Discharging: -4 – 131°F (-20 – 55°C)
Recommended DOD Setting Note*:EG4 recommends this value be set no lower than 20% to maintain the recommended 80% Depth of Discharge.
Storage Temperature Note**:Less than 3 months of storage. If longer than 3 months, recommended storage temperature will be 59°F – 86°F (15°C – 30°C).
Weight:309 lbs. (140 kg)
Enclosure Rating:IP67
Mounting Options:Wall attatched/Floor mount
Display/Indicators:LED Status
Connector Type:Degson quick connector/screw terminal
UL 1973:Pending
UL 9540:Pending
UL 9540A:Pending
UN 38.3:Pending
Cycle Life (70% EOL Capacity):10000 cycles @ 0.5C, 25°C, 80% DOD
Design Life*:15 years
Warranty:10 years or 10000 cycles
Application Type:Residential/Commercial/Off-grid/Backup
Lifetime Energy Throughput:122.2MWh
Note:Information subject to change without notice.

Inverter Downloads

SKU#:K0286, K0287, K0288, K0289, K0290, K0221
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL1741 Certificate:DownloadDOWNLOAD
CEC Listing – BigBattery ETHOS + EG4 FlexBOSS18:Go to linkGO TO LINK

Inverter Specifications

Nominal AC Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Frequency:60 Hz (Default) | 50 Hz
Max. AC Current:54A @ 240V | 54A @ 208V
Max. AC Input Power:13000W
Max. AC Bypass:90A
Operating Voltage Range:180 – 270VAC
Output Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Max. Output Current:66.7A
Output Frequency:60 Hz (Default) | 50 Hz
Nominal Output Power (without PV):12000W @ 240V | 12000W @ 208V
Nominal Output Power (with PV):16000W @ 240V | 13800kW @ 208V
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:-0.8 – 0.8 Leading Adjustable
Total Harmonic Distortion:<5% (Full Load)
Transfer Time:20ms (Default) | 10ms (Configurable) | 20ms (Parallel)
Rated Output Current:50A @ 240V | 57.7A @ 208V
Nominal Output Voltage:120/240VAC | 120/208VAC
Rated Output Power:12000W @ 240VAC | 12000W @ 208VAC
Peak Power:20000W (0.5 sec) | 15000W (1 sec)
12500W (6 min) | 11000W (12 min)
Operating Frequency:60 Hz (Default) | 50 Hz
Total Harmonic Distortion Voltage:<5%
No. of MPPTs:2
Inputs per MPPT:2 (MPPT 1) | 2 (MPPT 2)
Max. Usable Input Current:26A (MPPT 1) | 26A (MPPT 2)
Max. Short Circuit Input Current:31A (MPPT 1) | 31A (MPPT 2)
DC Input Voltage Range:100 – 600VDC
Unit Start-Up Voltage:200VDC
MPPT Operating Voltage Range:120 – 440VDC
Nominal MPPT Voltage:360VDC
Max. Utilized PV Array Power:1818000W
Max. Recommended PV Input:18000W
Max. Efficiency:97.5% (PV to Grid) | 94.5% (PV to Battery) | 94% (Battery to Grid)
Idle Consumption:<65W
Nominal Voltage:48VDC
Voltage Range:40 – 60VDC
Max. Charge / Discharge Power:10000W
Recommended Battery Capacity per Inverter:>300Ah
Operating / Storage Temperature Range:-13ºF – 140ºF (-25ºC – 60ºC)
Operating Altitude:<6,561 ft (2000 m)
Relative Humidity:0 – 100%
Typical Noise Emission:<50dB @ 3 ft
Design Topology:High-Frequency / Transformerless
Protection Rating:IP65 / NEMA 4X
Communications:RS485 / CANBus / WiFi / 4G
Max. Parallel Connections:10
Weight:115 lbs (52 kg)
Depth:11.2 in (287 mm)
Width:22.8 in (567 mm)
Height:30.5 in (775 mm)