The EG4-WallMount is a 48V LiFePO4 indoor energy storage battery built for wall or floor installation. It delivers 314Ah of capacity and roughly 16kWh of nominal energy per unit, with a built-in BMS rated for 200A continuous output. It's designed to pair with EG4 hybrid inverters, including the FlexBOSS18, for grid-tied or backup power applications.
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 These Specs Matter
An off-grid or grid-tied storage battery lives or dies by its BMS and its ability to handle real household load swings — not just its advertised capacity. The EG4-WallMount pairs 314Ah of LiFePO4 chemistry with a third-generation BMS that BigBattery describes as offering improved cell balancing and faster fault response. That matters because balancing precision directly affects usable cycle life over years of daily charge/discharge cycles, not just on day one.
Battery Characteristics
- Chemistry: LiFePO4 (Lithium Iron Phosphate)
- Nominal Voltage: 48V
- Capacity: 314Ah
- Nominal Energy: 16kWh
- Enclosure: Indoor wall or floor mount, IP20 rated
- BMS: Third-generation, with Auto-ID technology for automatic recognition of additional batteries added to the system
- Cold Weather Protection: Self-Heating Function, maintains performance in cold environments
Wiring & Configuration Limits
The EG4-WallMount is described by the manufacturer as cross-compatible with other EG4 battery models for expanded storage capacity, and it is intended to pair with EG4 hybrid inverters such as the FlexBOSS18. [NEEDS VERIFICATION] — the DATA provided does not specify exact maximum series or parallel unit counts, exact inverter model list beyond FlexBOSS18, or rack/stacking limits. Do not exceed inverter-rated input voltage or current when combining units; confirm exact stacking limits against the manufacturer's system manual before installation.
NOT confirmed for: use with non-EG4 inverters, starter/cranking applications, or any configuration not explicitly listed in the manufacturer's system manual referenced in the Resources tab.
Pro-Installer Tip
Undersized or mismatched wiring between stacked battery units is a common source of BMS lockout on multi-unit LiFePO4 systems. When you add units to an existing EG4 bank, imbalance between an older pack and a new one can trip the BMS protection circuit rather than let cells drift out of tolerance. Verify pack-to-pack voltage with a shunt-based battery monitor before tying a new unit into the bus, and let Auto-ID sync complete fully before applying load. As a professional standard, plan cycling around 80-100% DoD for LiFePO4 — this chemistry tolerates deep discharge far better than lead-acid, but consistent full-100% cycling without monitoring still accelerates wear on unbalanced packs.
Key Benefits
- 16kWh nominal energy per unit supports meaningful backup runtime for household circuits
- 200A continuous / 12.8kW peak output rated for heavy load and backup switching events
- Third-generation BMS improves balancing precision and fault response versus earlier EG4 packs
- Auto-ID technology reduces manual configuration steps when scaling a bank
- Self-Heating Function protects the pack in cold ambient conditions
- Cross-compatible with other EG4 battery models for phased system expansion
Technical Table
| Spec | Value |
|---|---|
| Voltage | 48V |
| Capacity | 314Ah |
| Nominal Energy | 16kWh |
| Chemistry | LiFePO4 |
| Max Continuous Discharge | 200A |
| Peak Power | 12.8kW |
| Enclosure Rating | IP20 (indoor) |
| Cold Weather Protection | Self-Heating Function |
| Certification | UL9540 (system-level, per source page title) |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
Designed to work with EG4 hybrid inverters, including the FlexBOSS18, for grid-tied and off-grid battery ESS applications. Cross-compatible with other EG4 battery models for expanded storage capacity per the manufacturer.
NOT confirmed: compatibility with non-EG4 inverters, standard lead-acid chargers, or outdoor/unconditioned installation — this is an indoor, IP20-rated enclosure. Do not install outdoors or in wet/exposed locations. Exact maximum number of units per bank is [NEEDS VERIFICATION] — confirm against the manufacturer manual before scaling a system.
FAQ
What chemistry does the EG4-WallMount use?
It uses LiFePO4 (Lithium Iron Phosphate) cells.
Can this battery be installed outdoors?
No. It carries an IP20 rating, which is intended for indoor wall or floor mount installation only.
What inverter is this battery designed to pair with?
The manufacturer lists the EG4 FlexBOSS18 hybrid inverter as a compatible pairing. Compatibility with other inverter brands is not confirmed in current specifications.
Does this battery have cold-weather protection?
Yes. It includes a Self-Heating Function intended to maintain performance in cold environments.
What is the continuous output rating?
200A continuous output, with 12.8kW peak power.
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 you order, ask us — we always reply back.
