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48V LiFePO₄ Battery · 16kWh · UL 1973 Certified · Indoor
The EG4 314Ah Indoor battery banks 16kWh nominal (12.86kWh recommended usable) behind a 200A continuous discharge rating, a third-generation BMS, and Auto-ID technology that recognizes and syncs new units automatically during install. It's UL 1973 and UN 38.3 certified, built for wall or floor mounting indoors, and backed by a 10-year manufacturer's warranty.
High-capacity storage in a wall- or floor-mountable indoor enclosure, cross-compatible with other EG4 battery models.
Up to 10.2kW of continuous discharge power and 12.8kW of peak power for 3 seconds, backed by a 250A battery breaker.
Both certifications are confirmed on this unit's own spec sheet, with UL 9540 applying for DC ESS and for AC ESS when paired with specific EG4 inverters.
Improved balancing precision and faster response times, plus automatic recognition and syncing of new batteries during setup.
Onboard diagnostics and system control, alongside real-time monitoring from the integrated BMS.
Internal heating keeps the cells within charge range through cold weather, protecting both performance and lifespan.
A physical rapid-shutdown control adds a manual safety layer on top of standard BMS protections.
Scales from one unit up to a larger indoor bank on the same platform as capacity needs grow.
This is EG4's indoor-specific wallmount platform — a compact, IP20-rated enclosure built to wall-mount or floor-mount inside a home or small business rather than face outdoor exposure. UL 1973 and UN 38.3 certification are both confirmed on the unit's own spec sheet, and UL 9540 applies as a standalone DC energy storage system, or as a certified AC energy storage system specifically when paired with the EG4 18kPV, 12kPV, FlexBOSS18, or FlexBOSS21 inverters. UL 9540A certification carries a specific installation requirement worth planning around: 6 inches of spacing between battery units.
A third-generation BMS brings improved cell balancing precision and faster response times, and Auto-ID technology automatically recognizes and syncs additional batteries as they're added — useful for anyone planning to scale up later rather than sizing the full system on day one. Combined with automatic self-heating, an E-Stop, and cross-compatibility with other EG4 battery models, it's built as a straightforward, code-conscious core for a home backup or off-grid system.
| Nominal voltage | 51.2 Vdc |
| Chemistry | LiFePO₄ |
| Nominal energy capacity | 16 kWh |
| Usable energy (80% DoD) | 12.86 kWh |
| Rated capacity | 314 Ah |
| Charging voltage range | 56–57 Vdc |
| Discharge cut-off voltage | 47.5 Vdc |
| Max continuous charge current | 157 A |
| Max continuous discharge current | 200 A |
| Continuous charge/discharge power | 8 kW / 10.2 kW |
| Peak power | 12.8 kW (3 sec) |
| Battery breaker | 250 A |
| Round-trip efficiency | 95% |
| Protection features | Over/under voltage, over-current, short circuit, high/low temp |
| Charging temp range | 32–122°F |
| Discharging temp range | -4–131°F |
| Storage temp (<3 months) | -4–131°F |
| Altitude | <9,843 ft |
| Enclosure rating | IP20 (indoor only) |
| Weight | 293.2 lbs |
| Dimensions (H×W×D) | 34.1 × 18.1 × 9.6 in |
| Mounting options | Wall or floor mount |
| Connector type | Degson quick-connect + screw terminal |
| Display | LCD touchscreen + LED status |
| Communication | RS485, CAN |
| Max parallel units | 16 |
| Cycle life | 10,000 @ 0.5C, 80% DoD |
| Design life | 10 years |
| Warranty | 10 years or 10,000 cycles |
UL 1973 and UN 38.3 confirmed on this unit's spec sheet. UL 9540 applies as DC ESS standalone, or AC ESS when paired with EG4 18kPV, 12kPV, FlexBOSS18, or FlexBOSS21. UL 9540A requires 6 in. of battery-to-battery spacing. FCC Part 15 (Class B) confirmed. Application: residential, commercial, off-grid, backup.
This battery needs a compatible inverter to function. Closed-loop communication partners differ by installation type.
UL 9540 (AC ESS) + closed-loop comms
Closed-loop comms, non-UL 9540
Yes — UL 1973 and UN 38.3 are both confirmed on this unit's own spec sheet. UL 9540 applies as a standalone DC energy storage system, and as a certified AC energy storage system when paired specifically with the EG4 18kPV, 12kPV, FlexBOSS18, or FlexBOSS21 inverters.
It automatically recognizes and syncs new battery units as they're added to a system, simplifying setup — useful both for the initial install and for adding capacity later.
Yes — UL 9540A certification specifies 6 inches of spacing between battery units. Worth planning into the install layout ahead of time, especially for larger parallel banks.
No — it's IP20-rated and specifically designed for indoor wall or floor mounting. For outdoor installation, look at BigBattery's EG4 314Ah All-Weather battery instead, which carries an IP67 rating.
Yes — it's built to be cross-compatible with other EG4 battery models for flexible system scaling.
10 years or 10,000 cycles, whichever comes first, covering defects in materials and workmanship.
Given the voltages and currents involved, installation should be handled by a qualified, licensed electrician or solar installer familiar with your local code requirements.
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