BigBattery ETHOS
BigBattery states 5.12 kWh nominal energy (per module, United States).
BigBattery states 5.12 kW continuous power (per module, United States).
Warranty terms: 12 years (BigBattery ETHOS 48V (FETHS-48051-G1 module), United States).
Brand: BigBattery
Published figures
No figures have been collected for usable energy, motor-start current, end-of-warranty capacity, and warranty throughput.
| Figure | Value | Publisher | Source |
|---|---|---|---|
| Nominal energy, BigBattery ETHOS 48V (FETHS-48051-G1 module), per module | 5.12 kWh | Manufacturer Not yet checked | Spec sheet, at p.1 / title + p.2, retrieved Sep 25, 2026, dated Dec 20, 2023 page cited, no quote |
| Continuous power, BigBattery ETHOS 48V (FETHS-48051-G1 module), per module | 5.12 kW | Manufacturer Not yet checked | Spec sheet, at p.2 / Max Continuous Power (module), retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Units per system, BigBattery ETHOS 48V (FETHS-48051-G1 module) | 16 modules | Manufacturer Not yet checked | Spec sheet, at p.1 / Features, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Largest stack, BigBattery ETHOS 48V (FETHS-48051-G1 module) | 81.6 kWh | Manufacturer Not yet checked | Spec sheet, at p.1 / Features, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Lowest operating temperature, BigBattery ETHOS 48V (FETHS-48051-G1 module) | −20°C | Manufacturer Not yet checked | Spec sheet, at p.2 / Discharge Temperature Range, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Highest operating temperature, BigBattery ETHOS 48V (FETHS-48051-G1 module) | 60°C | Manufacturer Not yet checked | Spec sheet, at p.2 / Discharge Temperature Range, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Weight, BigBattery ETHOS 48V (FETHS-48051-G1 module) | 54.8 kg | Manufacturer Not yet checked | Spec sheet, at p.2 / Weight (module), retrieved Sep 25, 2026, dated Dec 2, 2025 |
Stated stack range
Largest stated stack: 81.6 kWh (energy basis not stated) (16 modules).
Stated temperature limits
Stated operating range: −4°F (−20°C) to 140°F (60°C), BigBattery ETHOS 48V (FETHS-48051-G1 module).
Warranty terms
| Term | Figure | Document |
|---|---|---|
| Warranty, United States | BigBattery ETHOS 48V (FETHS-48051-G1 module): 12 years | Web page, at Warranty tab, retrieved Sep 25, 2026, dated Sep 25, 2026 |
Features the manufacturer states
Configuration: BigBattery ETHOS 48V (FETHS-48051-G1 module).
| Feature | Stated | Source |
|---|---|---|
| Chemistry | LFP Not yet checked | Spec sheet, at p.2, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Coupling | DC Not yet checked | Spec sheet, at p.1, retrieved Sep 25, 2026, dated Dec 2, 2025 page cited, no quote |
| Built-in inverter | No Not yet checked | Spec sheet, at p.1, retrieved Sep 25, 2026, dated Dec 2, 2025 page cited, no quote |
| Compatible inverters | EG4, Growatt, Victron, Schneider, Deye, Inhenergy, Sol-Ark, Voltronic, Megarevo, SMA, Solis, Luxpower Not yet checked | Spec sheet, at p.1 / Compatible Inverters, retrieved Sep 25, 2026, dated Dec 2, 2025 page cited, no quote |
| Enclosure rating | IP65 / NEMA 4X Not yet checked | Spec sheet, at p.2 / Protection Rating, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Nominal battery voltage | 51.2 V Not yet checked | Spec sheet, at p.2 / Nominal Voltage, retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Dimensions | 170 x 674 x 410 mm Not yet checked | Spec sheet, at p.2 / Dimensions (DxWxH), retrieved Sep 25, 2026, dated Dec 2, 2025 |
| Product status | current Not yet checked | Web page, retrieved Sep 25, 2026, dated Sep 25, 2026 |
Government and program lists
This product is on none of the lists this site reads.
Installs
No install count this site publishes covers this product.
Recalls and safety notices
No notice in the recall sources this site reads is matched to this product. That is not a safety finding. See every recall notice.
- UL 9540 listed: Yes (BigBattery ETHOS 48V (FETHS-48051-G1 module)) as system with EG4 inverters
- UL 9540A tested: Yes (BigBattery ETHOS 48V (FETHS-48051-G1 module))
The maker states the listing or test. The listing body's records have not been checked.
Backup hours from your load
This battery has no maker-stated usable energy on this site.