Description
Big Battery 48V EG4 WallMount Indoor Battery – FEWMT-48143-G1
Introducing the game-changing 48V 14.3kWh WallMount Indoor Battery, the latest solution from the EG4 team for residential and commercial ESS. This UL-certified, wall-mountable battery ensures reliable, efficient power delivery for any home or business, allowing you to see massive lifetime savings on your utility costs, or achieve full grid independence!
This battery was designed with safety, longevity, and visibility in mind, with a lifespan of over 8000 cycles at 80% DoD. That’s 82.6MWh of lifetime production. This battery comes equipped with LiFePO4 cells, the safest chemistry on the market today, and a durable, IP20-rated casing. Plus, this unit’s intelligent BMS continuously monitors and records module and cell voltage, current, and temperature in real-time, in addition to a passive cell-balancing function, optimizing performance and ensuring long-lasting power, and an LCD touch screen display on the side of the unit allows you to stay up to the date on the status of your battery day in and day out. But that’s not all. . .
Not only does the WallMount Indoor Battery feature an automatic self-heating function and dual fire extinguishers for fail-safe protection in case of thermal runaway, but EG4 continues to innovate with an all-new emergency stop function. This optional ESS disconnect is capable of shutting down your entire power system at the press of a button, so should an emergency happen, you’ll always be prepared.
This battery serves as the foundation for EG4’s indoor ESS systems, but being equipped with full RS485 and CANBus protocols, you’re able to setup closed-loop communications with a wide range of inverters on the market today. It’s time to revolutionize how you power your home or business. Upgrade today with the 48V WallMount Indoor Battery from EG4!
Features
- WALL-MOUNTABLE DESIGN
- AUTOMATIC SELF-HEATING
- TOUCH SCREEN LCD DISPLAY
- PASSIVE CELL BALANCING
- INTEGRATED 600A BUSBARS
- DUAL INTERNAL FIRE ARRESTORS
- EMERGENCY DISCONNECT FUNCTION
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ZERO MAINTENANCE REQUIRED
- RESIDENTIAL POWER SYSTEMS
- HOME SOLAR SYSTEMS
- CABINS & TINY HOMES
- FAMILY HOMES & MANSIONS
- OFF-GRID HOMESTEADS
- EMERGENCY POWER
- WHOLE HOME BACKUP
- COMMERCIAL SYSTEMS
- WHOLE OFFICE BACKUP
- LEAD ACID REPLACEMENT
Specifications
| System Voltage | 48V |
|---|---|
| Nominal Voltage | 51.2V |
| Chemistry | LiFePO4 |
| Energy Capacity | 14.3 kWh |
| Capacity (Ah) | 280 Ah |
| BMS Charging Voltage (Bulk/Absorb) | 56V ± 0.8V |
| Recommended Charging Voltage (Bulk/Absorb) | 56.2V ± 0.2V |
| Recommended Float Setting | 54V ± 0.2V |
| Recommended SoC Cutoff | 20% |
| Max Continuous Charge/Discharge Current | 200A |
| Recommended Charge Current | 60 – 160A |
| Recommended Discharge Current | 160A |
| Max Continuous Discharge Rate | 10,240 W |
| Operating Voltage | 56V |
| Power Consumption | 224 W |
| Internal Temperature Cutoffs | ≤32ºF (On) / ≥41ºF (Off) |
| Charging Temperature Range | 32ºF – 113ºF (0ºC – 45ºC) |
| Discharging Temperature Range | -4ºF – 122ºF (-20ºC – 50ºC) |
| Storage Temperature Range | -4ºF – 122ºF (-20ºC – 50ºC) |
| Protection Rating | IP20 |
| Communications | RS485 / CANBus |
Dimensions
| Weight | 282.2 lbs (128 kg) |
|---|---|
| Depth | 9.6 in (245 mm) |
| Width | 18.1 in (460 mm) |
| Height | 36.4 in (925 mm) |
What our Experts Think
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Compact, space-efficient design — Offers 14.3 kWh (48 V / 280 Ah) capacity in a slim wall-mountable form, perfect for homes, cabins, offices, or small commercial setups.
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Long-life LiFePO₄ with robust BMS — Smart battery management system ensures over 8,000 cycles at 80% depth-of-discharge for extended service life.
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Strong power delivery — Supports up to 200 A continuous charge/discharge, delivering over 10 kW output for home loads, backup power, or off-grid applications.
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Safe and feature-rich — Built-in self-heating, emergency-stop support, and real-time monitoring via RS485/CANBus enhance safety and usability.
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Scalable and inverter-ready — Easily integrates with hybrid inverters and can be paralleled with other units for increased capacity.
Q&A
Q: What is the BigBattery 48V EG4 WallMount Indoor Battery (FEWMT‑48143‑G1)?
A: A 48 V, 14.3 kWh LiFePO₄ indoor battery module designed for home or commercial energy storage, wall-mountable for compact installations in solar, backup, or hybrid systems.
Q: What are its main advantages and features?
A: Built-in intelligent BMS with real-time monitoring and passive cell balancing, integrated self-heating for cold climates, dual internal fire-arrestors, optional emergency-stop function, and an LCD touchscreen with RS485/CAN communications for easy monitoring.
Q: How is it connected and integrated?
A: Includes 600 A busbars with multiple terminals for simple parallel battery setups or multi-inverter connections.
Q: What are typical use cases?
A: Indoor home solar storage, emergency backup power, off-grid cabins or tiny homes, and commercial or office backup systems.
Q: What performance can be expected?
A: 14.3 kWh capacity, 51.2 V nominal voltage, up to 200 A continuous charge/discharge, and over 8,000 cycles at 80% depth-of-discharge for long-lasting use.
Q: Is installation and maintenance easy?
A: Yes, the wall-mount design and integrated busbars make installation straightforward, and the unit is maintenance-free due to LiFePO₄ chemistry and automated BMS
Maintenance Tips
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Mount the battery in a cool, dry, and well-ventilated indoor location to ensure optimal 48V performance and safety.
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Regularly inspect terminals, connectors, and wiring for corrosion, looseness, or wear to maintain reliable operation.
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Clean the exterior with a soft, dry cloth to remove dust and prevent heat buildup.
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Avoid exposing the battery to direct sunlight, moisture, or extreme temperatures to protect internal cells.
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Monitor state of charge and avoid deep discharges to preserve long-term capacity and efficiency.
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For extended storage, maintain a 50–60% charge and disconnect from all loads and chargers.
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