The EG4 WallMount 314Ah All-Weather Battery is a 51.2V lithium iron phosphate (LiFePO4) storage unit built for outdoor installs — solar-plus-storage, off-grid systems, and whole-home backup where you need real capacity and a pack that can live outside. It delivers 16kWh per unit and is designed to scale into a closed-loop system with the FLEXBOSS21.
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.
E-E-A-T Intro: Why This Configuration Matters
16kWh sounds abstract until you translate it into usable energy. At 51.2V nominal and 314Ah, this pack stores roughly 16,076Wh of energy. In practice, that's runtime for a refrigerator, well pump, and lighting circuit through an overnight outage, or a meaningful chunk of daily solar self-consumption for a home. The listing states 314Ah charge capacity and 16kWh energy capacity — both figures come directly from the manufacturer spec sheet, and they're the numbers you should use when sizing against your inverter and load list.
This unit pairs with the FLEXBOSS21, an all-in-one inverter designed for closed-loop communication with EG4 batteries — meaning the inverter and battery BMS talk to each other directly, rather than relying on generic lead-acid charge profiles.
Battery Characteristics
- Chemistry: LiFePO4 (Lithium Iron Phosphate)
- Nominal Voltage: 51.2V
- Form Factor: Outdoor wall-mount enclosure, IP67-rated (dust and water ingress protection)
- BMS: EG4 smart BMS with active cell balancing
- Cold-Weather Protection: Built-in internal heaters for low-temperature operation
- Connectivity: Bluetooth + Wi-Fi monitoring, OTA firmware updates via the EG4 app
Wiring & Configuration Limits
This battery is built for closed-loop parallel expansion — up to 32 batteries can be paralleled together with EG4 inverters/batteries using auto-addressing, per the manufacturer data. Certifications list UL 9540 specifically when paired with the FLEXBOSS21 or FLEXBOSS18 inverters.
NOT for series wiring across battery packs to raise system voltage beyond the stated 51.2V nominal architecture. Not compatible with non-EG4 inverters for closed-loop auto-addressing functionality — pairing with third-party inverters may work in basic on/off-grid modes but without the communication features described here. Do not mix this unit with older or different-capacity battery packs in the same bank; capacity and age mismatches force the BMS to throttle the whole bank to the weakest unit.
Pro-Installer Tip
Paralleling lithium packs of mismatched charge state is the single fastest way to trip a BMS lockout on a new install. When you add a battery to an existing bank, don't just land the cables and walk away — bring the new unit to a similar state of charge as the existing bank first, then close the loop. Skipping this step lets a large voltage differential drive a current inrush the BMS reads as a fault, shutting the pack down mid-commissioning. Verify state of charge with a shunt-based battery monitor before parallel connection, not just the app's percentage readout, since app values can lag actual cell voltage under load. As a professional standard, plan cycling around an 80-100% depth of discharge window for LiFePO4 — this pack's tested cycle life (10,000+ cycles) is rated at 80% DoD, so consistent full-depth cycling beyond that spec will shorten service life versus the tested figure.
Key Benefits
- 16kWh usable-class capacity per unit for extended backup runtime
- IP67 enclosure rated for genuine outdoor placement — no dedicated equipment room required
- Active cell balancing via EG4 smart BMS supports long-term pack efficiency
- Internal heaters allow charging confidence in cold climates
- Bluetooth/Wi-Fi monitoring and OTA updates keep the system current without a service visit
- Closed-loop auto-addressing simplifies scaling up to 32 units with compatible EG4 inverters
- Design life tested to 10,000+ cycles at 80% DoD
Technical Table
| Spec | Value |
|---|---|
| Nominal Voltage | 51.2V |
| Charge Capacity | 314Ah |
| Energy Capacity | 16kWh |
| Chemistry | LiFePO4 (Lithium Iron Phosphate) |
| Cycle Life | 10,000+ cycles @ 80% DoD |
| Max Parallel (closed-loop) | Up to 32 batteries |
| Enclosure Rating | IP67 |
| Certifications | UL 1973; UL 9540 (with FLEXBOSS21 & FLEXBOSS18) |
| Dimensions | 34.6" x 21.7" x 9.3" |
| Weight | 309 lbs |
| Cold-Weather Charging | Internal heaters supporting low-temperature operation |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
Designed for closed-loop integration with EG4 inverters/batteries, including the FLEXBOSS21 and FLEXBOSS18 — UL 9540 system certification applies specifically to these pairings. Suitable for residential and light commercial solar storage, outdoor battery banks, off-grid power systems, and backup power applications.
NOT included: the FLEXBOSS21 inverter, mounting hardware, or interconnect cabling are not confirmed as included components in this data set [NEEDS VERIFICATION]. NOT for use as a vehicle starter battery. Standard lead-acid chargers are NOT recommended — use only EG4/compatible LiFePO4-rated charging sources through the closed-loop inverter pairing.
FAQ
Q: What is the usable energy capacity of one EG4 WallMount 314Ah battery?
A: The unit is rated at 16kWh energy capacity with 314Ah charge capacity at 51.2V nominal.
Q: Can this battery be installed outdoors?
A: Yes. The enclosure carries an IP67 rating and includes internal heaters for cold-weather operation.
Q: How many of these batteries can be paralleled together?
A: Up to 32 batteries can be connected in a closed-loop parallel configuration with compatible EG4 inverters.
Q: What certifications does this system carry?
A: UL 1973, and UL 9540 when paired with the FLEXBOSS21 or FLEXBOSS18 inverters.
Q: What is the rated cycle life?
A: Tested to 10,000+ cycles at 80% depth of discharge.
Warranty & Support
Warranty terms for this system are documented in the manufacturer resources rather than in this listing's source data. Refer to the "Resources (System Manuals and Warranty)" Tab above for coverage details before you order. If anything in this listing is unclear, ask us before you order — we always reply back.
