The EG4 WallMount 314Ah All-Weather Battery is a 51.2V lithium iron phosphate (LiFePO4) storage unit rated at 16kWh, built to live outdoors. It's paired here with the FLEXBOSS18, and the combination targets solar-plus-storage, off-grid, and whole-home backup installs where capacity and weather resistance both matter.
Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Why This Matters (Field Perspective)
16kWh at 51.2V nominal translates to a substantial usable energy reserve for a single wall-mounted unit — this is capacity built for whole-home backup, not a small accessory bank. The IP67 enclosure and internal heaters are what separate an "outdoor-rated" battery on paper from one that actually survives an exterior install through a real winter. The EG4 smart BMS with active cell balancing is the mechanism that keeps individual cells from drifting apart in charge state over years of cycling — that's what protects the 10,000+ cycle design life claim from the manufacturer's own testing at 80% DoD.
Battery Characteristics
Chemistry: Lithium Iron Phosphate (LiFePO4). This is a stationary wall-mount storage battery, not a group-size automotive or marine case — dimensions are 34.6" x 21.7" x 9.3" and weight is 309 lbs. The enclosure carries an IP67 rating for dust and water exposure, and built-in heaters support charging in cold conditions.
Wiring & Configuration Limits
This battery supports closed-loop parallel expansion with EG4 inverters and batteries, up to 32 units in parallel, with auto-addressing to simplify multi-unit setup. DATA does not specify a series configuration limit or a maximum series voltage — [NEEDS VERIFICATION] for series stacking beyond the 51.2V nominal single-unit rating.
Do not mix this battery with lead-acid, AGM, or other chemistries in the same bank. Do not exceed the stated 32-unit closed-loop parallel maximum without manufacturer confirmation. Series configuration limits are not specified in the source data — confirm with EG4 documentation before stacking for higher voltage.
Pro-Installer Tip
Parallel banks of lithium batteries are only as reliable as their weakest link in state-of-charge matching. If one unit in a 32-battery closed-loop bank is added at a different charge level or firmware version than the rest, you risk imbalance that trips BMS protection under load. Before commissioning a multi-unit bank, verify all units are on matching firmware via the EG4 app's OTA update feature and bring each battery to a similar state of charge before wiring in parallel. Use a shunt-based battery monitor at the bank level, not just per-unit app readings, to confirm balanced current draw across all parallel units. Keep cycling within the tested 80% DoD standard this unit is rated for — routinely discharging deeper shortens the path to the 10,000-cycle design life ceiling.
Key Benefits
- 16kWh (314Ah) usable capacity per unit for extended runtime and backup coverage
- IP67 enclosure rated for outdoor dust and water exposure
- Internal heaters for cold-weather charging reliability
- EG4 smart BMS with active cell balancing for long-term efficiency
- Bluetooth + Wi-Fi monitoring with OTA firmware updates via the EG4 app
- Closed-loop auto-addressing for simplified scaling up to 32 batteries in parallel
- Tested 10,000+ cycles at 80% DoD design life
- UL 1973 certified; UL 9540 certified when paired with Flexboss21 or Flexboss18
Technical Table
| Spec | Value |
|---|---|
| Nominal Voltage | 51.2V |
| Charge Capacity | 314Ah |
| Energy Capacity | 16kWh |
| Chemistry | LiFePO4 |
| Cycle Life | 10,000+ cycles @ 80% DoD (tested) |
| Dimensions | 34.6" x 21.7" x 9.3" |
| Weight | 309 lbs |
| Enclosure Rating | IP67 |
| Max Parallel (closed-loop) | Up to 32 batteries |
| Certifications | UL 1973; UL 9540 (with Flexboss21 & Flexboss18) |
| Max Continuous Discharge (A) | [NEEDS VERIFICATION] |
| Max Continuous Charge (A) | [NEEDS VERIFICATION] |
| Peak Discharge | [NEEDS VERIFICATION] |
| Operating Temp Range | [NEEDS VERIFICATION] |
| Terminal Type | [NEEDS VERIFICATION] |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
This battery is designed for closed-loop integration with EG4 inverters and batteries, including the FLEXBOSS18 referenced in this listing. UL 9540 system certification applies specifically when paired with the Flexboss21 or Flexboss18 inverter — pairing with unlisted or third-party inverters is NOT covered by that certification. Use only EG4-specified charging equipment and closed-loop communication cabling; standard lead-acid chargers are NOT recommended for this LiFePO4 battery. This unit is a stationary wall-mount storage battery — it is NOT intended as a starter/cranking battery and is NOT a drop-in replacement for golf cart or marine deep-cycle batteries. Cold-weather charging is supported via the internal heaters, but confirm the manufacturer's stated minimum charge temperature in the Resources tab before charging in sub-freezing conditions without the heater function active.
Options & SKUs
| Variant | SKU | Price (USD) |
|---|---|---|
| variable parent (6 variations) | K0286-V | $7,114.97 |
This listing's base configuration is a variable parent with 6 sub-variations. Only the base SKU and price are provided in current data; if you need pricing or specs for a specific sub-variation, ask us before you order.
FAQ
What chemistry does the EG4 WallMount 314Ah battery use?
It uses lithium iron phosphate (LiFePO4) cells with EG4's smart BMS and active cell balancing.
Can this battery be installed outdoors?
Yes. The enclosure carries an IP67 rating and includes internal heaters to support operation in cold weather.
How many of these batteries can be wired together?
Up to 32 batteries can be connected in a closed-loop parallel configuration with auto-addressing. Series configuration limits are not specified in available data — [NEEDS VERIFICATION].
Is this battery UL certified?
It is UL 1973 certified, and the system carries UL 9540 certification when paired with the Flexboss21 or Flexboss18 inverter.
Can I use a standard lead-acid charger with this battery?
No. Standard lead-acid chargers are not recommended for this LiFePO4 battery. Use EG4-specified charging equipment.
Warranty & Support
Warranty terms are not included in the provided data. Refer to the "Resources (System Manuals and Warranty)" Tab above for manufacturer warranty documentation. If you have questions about this system before ordering, ask us — we always reply back.
