This is the EG4 WallMount, a 48V LiFePO4 wall or floor-mounted storage battery built for indoor whole-home backup and grid-tied solar systems. It stores 16kWh nominal energy at 314Ah capacity and is designed to pair with the EG4 FlexBOSS21 hybrid inverter. UL9540 certification applies specifically when paired with the FlexBOSS 18 or FlexBOSS 21 inverters.
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.
Built for the Long Haul: What the Specs Mean in the Field
A 314Ah, 48V LiFePO4 pack works out to roughly 16kWh of nominal stored energy. In practical terms, that's enough capacity to carry critical home loads — refrigeration, lighting, network gear, well pumps — through an evening outage or to shift solar production into peak-usage hours. The 200A continuous output rating (12.8kW peak) means this unit is sized for whole-home backup applications, not just a handful of circuits.
The third-generation BMS onboard handles cell balancing and monitoring with faster response than earlier EG4 generations, which matters most when batteries are stacked in multi-unit arrays and need to stay in sync over years of cycling.
Battery Characteristics
Chemistry: LiFePO4 (Lithium Iron Phosphate). This is a stationary energy storage system (ESS) unit, wall or floor mounted, with an IP20-rated enclosure — intended for indoor installation, not outdoor or damp-location use. It includes a self-heating function to protect against cold-temperature charging damage, a known failure point for lithium batteries installed in unconditioned spaces like garages or sheds.
Wiring & Configuration Limits
The EG4 WallMount is cross-compatible with other EG4 battery models, allowing you to scale storage capacity by adding units to an existing EG4 system. Auto-ID technology recognizes new batteries automatically during installation and syncs them into the array.
NOT covered by DATA: Specific maximum parallel unit count and series wiring configuration are [NEEDS VERIFICATION]. Do not assume this battery can be wired in series to raise system voltage beyond 48V without confirming with BigBattery documentation first. UL9540 system certification applies only when this battery is paired with the EG4 FlexBOSS 18 or FlexBOSS 21 inverter — pairing with other inverters is possible per the cross-compatibility claim, but does not carry the UL9540 certification.
Pro-Installer Tip
Stacking multiple lithium ESS units without confirming firmware and BMS generation match is a common source of imbalance. Mixing an older EG4 battery generation with this third-generation BMS unit can cause one module to work harder than the rest, shortening its service life relative to the pack. Before adding this unit to an existing array, verify BMS compatibility and firmware version with BigBattery support, and monitor the combined bank with a shunt-based battery monitor so you can catch a diverging state-of-charge on any one module early. LiFePO4 chemistry tolerates 80-100% depth of discharge routinely, but pack-level imbalance — not chemistry limits — is what causes early lockouts in multi-unit systems.
Key Benefits
- 16kWh nominal energy storage, 314Ah at 48V, for whole-home backup or load-shifting applications.
- 200A continuous output supports heavy household loads; 12.8kW peak power handles surge demand.
- Third-generation BMS delivers improved cell balancing precision and faster fault response.
- Self-heating function protects the pack in cold ambient conditions.
- Auto-ID technology simplifies multi-unit installation and setup.
- Cross-compatible with other EG4 battery models for flexible system scaling.
Technical Table
| Spec | Value |
|---|---|
| Voltage | 48V |
| Capacity | 314Ah |
| Energy Capacity | 16kWh |
| Chemistry | LiFePO4 |
| Max Continuous Discharge | 200A |
| Peak Power | 12.8kW |
| Enclosure Rating | IP20 (indoor use) |
| Mounting | Wall or floor mount |
| Certification | UL9540 (with EG4 FlexBOSS 18/21) |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
Compatible with: EG4 FlexBOSS21 hybrid inverter (UL9540-certified system pairing), and cross-compatible with other EG4 battery models for expanded storage.
NOT compatible with / NOT included: UL9540 system certification does NOT extend to inverter pairings outside the EG4 FlexBOSS 18 or FlexBOSS 21. This is an indoor-rated (IP20) enclosure — NOT rated for outdoor or wet-location installation. Series/parallel wiring limits beyond what is stated above are [NEEDS VERIFICATION] — confirm with manufacturer documentation before designing a multi-unit array. Standard lead-acid chargers are NOT appropriate for this LiFePO4 battery; use only a charge source/inverter compatible with its BMS communication protocol.
FAQ
Q: What inverter is the EG4 WallMount certified to work with under UL9540?
A: UL9540 certification applies specifically when this battery is paired with the EG4 FlexBOSS 18 or FlexBOSS 21 hybrid inverter.
Q: Can this battery be installed outdoors?
A: The enclosure is IP20 rated, which is intended for indoor installation. Outdoor suitability is not specified in manufacturer data.
Q: How much usable energy does this battery provide?
A: It stores 16kWh nominal energy at 314Ah, 48V capacity.
Q: Can I add this to an existing EG4 battery bank?
A: Yes. It is cross-compatible with other EG4 battery models and uses Auto-ID technology to sync new units during installation. Confirm BMS generation and firmware compatibility before mixing with older EG4 units.
Q: Does it handle cold weather installation?
A: Yes, it includes a self-heating function to maintain performance and battery health in cold environments.
Warranty & Support
Warranty terms, brochures, and full manufacturer specifications are available in the "Resources (System Manuals and Warranty)" Tab above on this page. If you have questions about pairing this battery with an existing EG4 array or a specific inverter setup, ask us before you order — we always reply back.
