Big Battery | 12kW 20.4kWh ETHOS Off-Grid Power System
Overview
REVOLUTIONIZING OFF-GRID POWER! BigBattery’s 48V ETHOS systems are here, offering a robust 20.48kWh setup perfect for off-grid power in tiny homes, cabins, or homesteads, backed by advanced safety, reliability, and cutting-edge features.
The ETHOS is designed as a flexible off-grid power solution, featuring a modular, stackable layout for easy expansion and includes all hardware needed for quick wall mounting. Built with an IP65-rated casing, internal fire suppression, and a high-performance BMS with auto cell-balancing, the ETHOS is engineered for enduring safety and reliability. The control box comes with an interactive LED display and CANBus/RS485 communication protocols to keep you informed on power status and performance.
But there’s more! We pair the ETHOS with two 6000W split-phase inverter-chargers from EG4, each equipped with LCD touch displays, 2 MPPT inputs, integrated UPS for seamless off-grid transition, and capability for PV arrays up to 8000W. With smart load control, AC coupling, and peak shaving, these inverters help you save on utility costs and manage your power needs effectively.
Whether it’s for essential backup power, a long-term off-grid setup, or reliable year-round energy, the ETHOS delivers efficient, dependable power, allowing you to save on utilities and stay prepared. Take control of your energy with the 48V ETHOS today!
What's Included
4 × 48V ETHOS 5.12kWh Stackable Battery Module
1 × ETHOS Control Box
1 × ETHOS RACK BASE
2 × EG4 6kW (8kPV) OFF-GRID INVERTER
1 × Ethos Parallel Comm Cable 4.9 ft (150cm)
1 × 2AWG (Black and Red) 3FT Ring to Ring Terminal Cable
2 × Ethos Parallel Power Cable 4.9 ft (1500mm)
Specs and Downloads
Single Stack Tech Specs
| System Voltage: | 48V |
| Nominal Voltage: | 51.2V |
| Chemistry: | LiFePO4 |
| kWh Capacity: | 10.24kWh |
| Ah Capacity: | 200Ah |
| Charging Voltage Range: | 55.6 - 57V |
| Max Charge Voltage: | 57V |
| Operating Voltage Range: | 48 – 57V |
| Suggested Low Voltage Cutoff: | 48 – 50.8V |
| Cell Configuration: | 16S 2P |
| Max Continuous Discharge Current: | 200A |
| Max Continuous Power: | 10240W |
| Max Discharge Peak Current: | 300A (Max 5 seconds) |
| Max Charge Current: | 200A |
| Charge Temperature Range: | 32°F - 113°F (0°C - 45°C) |
| Discharge Temperature Range: | -4°F - 140°F (-20°C - 60°C) |
| Optimal Discharge Temperature Range: | 59°F - 95°F (15°C - 35°C) |
| Storage Temperature Range (SoC >50%): | -4°F - 113°F (-20°C - 45°C) (Max 6 months) |
| Weight: | 273 lb (123.8 kg) |
| Depth: | 6.7 in (170 mm) |
| Width: | 26.5 in (674 mm) |
| Height: | 43.3 in (1100 mm) |
| Max Connections: | Up to (16) parallel connections per control box |
| Protection Rating: | IP65 / NEMA 4X |
| Communications: | CANBus / RS485 |
| Certifications: | UL9540A, UL1973, & UN38.3 |
Inverter Specs
AC INPUT & OUTPUT
| AC Voltage: | 120V AC / 240V AC |
| AC Frequency: | 50 Hz / 60 Hz |
| Max. Continuous AC Current: | 37.5A @ 240V |
| Max. AC Input Power: | 9000W |
| AC Bypass: | 50A |
| Output Voltage: | 120V AC / 240V AC |
| Output Frequency: | 50 Hz / 60 Hz |
| Max. Continuous Output Current: | 25A @ 240V |
| Output Power: | 6000W |
| Surge Capacity: | 12000W (3.5 sec) / 11000W (5 sec) |
| Power Factor: | 0.99 (Full Load) |
| Reactive Power Adjustment Range: | -0.8 - 0.8 Leading Adjustable |
| Total Harmonic Distortion: | <3% |
| Switching Time: | <15 ms (Single) / <30 ms (Parallel) |
PV INPUT
| No. of MPPTs (Inputs per MPPT): | 2 (1) |
| Max. Input Current: | 17A / 17A |
| Max. Short Circuit Input Current: | 25A / 25A |
| DC Input Voltage Range: | 100 - 480V DC |
| Start Up Voltage: | 100V DC ± 10V DC |
| MPPT Operating Voltage Range: | 120 - 385V DC |
| MPPT Voltage: | 320V DC |
| Max. PV Array Power: | 8000W (4000W per MPPT) |
| MPPT Efficiency: | 99% |
BATTERY
| Nominal Voltage: | 48V DC |
| Battery Voltage Range: | 46.4 - 60V DC |
| Max. Discharge Current: | 140A |
| Max. Charge Current: | 125A |
| DC Cut-Off Voltage: | 59V DC |
| DC Recovery Voltage: | 57.4V DC |
| Charge Cut-Off Voltage: | 58.4V DC |
OPERATING ENVIRONMENT & DIMENSIONS
| Operating Temperature: | 32ºF - 113ºF (0ºC - 45ºC) |
| Storage Temperature: | 5ºF - 140ºF (-15ºC - 60ºC) |
| Altitude: | <6,561 ft (2000 m) |
| Relative Humidity: | 5 - 95% |
| Typical Noise Emission: | <58 dB |
| Protection Rating: | IP20 |
| Max. Parallel Connections: | 16 |
| Weight: | 52.9 lbs (24 kg) |
| Depth: | 5.25 in (132 mm) |
| Width: | 18 in (457 mm) |
| Height: | 25.5 in (648 mm) |
Are Solar Guys Pro Authorized Retailers?
Yes! We are proud to be one of the few online retailers who are authorized retailers for every single product we carry!
When Will My Order Ship?
Most orders ship within 1–3 business days. You’ll get a tracking number as soon as it ships via email!
Do We Accept Returns?
Yes absolutely, we have a no-hassle, 30-day return policy on all items! To refer to the full policy, click HERE
Are Products Brand New?
Yes! All products on Solar Guys Pro are 100% brand-new and in perfect condition.
We do not sell any used or refurbished items.
Frequently Asked Questions
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