Product Summary:
The BigBattery ETHOS™ + EG4 18kPV ESS System is a complete, high-performance energy solution designed for both on-grid and off-grid applications. Combining the scalable ETHOS 48V lithium battery system with the powerful EG4 18kPV hybrid inverter, this system delivers reliable, efficient, and intelligent energy management in one integrated package.
Expandable up to 80+ kWh, the ETHOS battery adapts to your energy needs-while the 18kPV inverter seamlessly manages power from solar, battery storage, and the grid. Ideal for home backup, energy savings, and full off-grid independence.
Designed with UL 9540 certified configurations, advanced battery management, and U.S.-engineered components, this system ensures safe, maintenance-free performance with seamless closed-loop communication between battery and inverter.
Ships From: Texas, USA
Warranty: 12 Years (Battery), 10 Years (Inverter)
Support: Lifetime USA-Based Tech Support
Compatibility
Integrated & Optimized System (UL 9540 Certified + Closed-Loop Communication):
- ETHOS Battery System + EG4 18kPV Hybrid Inverter
Expandable & Flexible:
- Scalable ETHOS battery capacity up to 80+ kWh
- Compatible with additional ETHOS modules for future expansion
Key Features
- All-in-One ESS Solution – Battery + inverter system designed to work seamlessly together
- 18kPV Hybrid Inverter Power – Supports solar, battery, and grid simultaneously
- LiFePO4 Battery Chemistry – Safe, stable lithium technology with long lifespan
- 6,000+ Cycle Life – Built for years of daily use and long-term savings
- Advanced BMS Protection – Full protection against voltage, current, and temperature risks
- Closed-Loop Communication – Optimized performance and real-time coordination between battery and inverter
- Modular Expansion – Easily increase storage capacity as your energy needs grow
- Fast Installation – Streamlined setup with integrated system design
- Maintenance-Free Operation – No routine servicing required
A complete, future-ready energy storage system built for independence, reliability, and long-term performance-with the safety, support, and engineering you can trust.
BigBattery ETHOS Battery & 18kPV Hybrid Inverter (ESS) | 10.24–46.1kWh | UL9540 | Grid-Tied Home Solar System (18kW PV)
$7,758.00
SKU# K0954
Battery Selected
2× 48V ETHOS
Total Capacity
10.24 kWh
Inverter Selected
1× EG4 18kPV
Input / Output
18 kW / 12 kW
Choose Your ESS Configuration*
1x Inverter
Standard
2x Inverter
Large
3x Inverter
3 Phase
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Battery Downloads
SKU#:K0954, K0955, K0956, K0957, K0753, K0754, K0959, K0960, K0755, K0961, K0966, K0967, K0968
Spec Sheet:
DOWNLOAD
DOWNLOADUser Manual:DOWNLOAD
DOWNLOADUL9540 Certificate – BigBattery ETHOS + EG4 18kPv:DOWNLOAD
DOWNLOADUL9540A Certificate:DOWNLOAD
DOWNLOADUL1973 Certificate:DOWNLOAD
DOWNLOADUN38.3 Certificate:DOWNLOAD
DOWNLOADSafety Data Sheet:DOWNLOAD
DOWNLOADCEC Listing – BigBattery ETHOS + EG4 18kPv:
GO TO LINK
GO TO LINKBattery Specifications
GTIN-12 (U.P.C.):850061252005
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
BMS Cutoff Range:42 – 47V
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:UL9540, UL9540A, UL1973, & UN38.3
Inverter Downloads
SKU#:INV024
Spec Sheet:DOWNLOAD
DOWNLOADUser Manual:DOWNLOAD
DOWNLOADUL9540 Certificate – BigBattery ETHOS + EG4 18kPv:DOWNLOAD
DOWNLOADUL1741 Certificate:DOWNLOAD
DOWNLOADUL 1741 CRD PCS Test Verification Of Conformity Security:DOWNLOAD
DOWNLOADRapid Shut Down Wiring Guide:DOWNLOAD
DOWNLOADWhitepapers, Firmware, & Wiring Diagrams:GO TO LINK
GO TO LINKCEC Listing – BigBattery ETHOS + EG4 18kPv:GO TO LINK
GO TO LINKInverter Specifications
AC Voltage:120V AC / 240V AC
AC Frequency:50 Hz / 60 Hz
Nominal Voltage:51.2V
Max. Continuous AC Current:50A @ 240V AC
Max. AC Input Power:12000W
Max. AC Bypass:200A
Operating Voltage Range:180 – 270V AC
Output Voltage:120V AC / 240V AC
Max. Continuous Output Current:50A
Output Power:12000W
BMS Cutoff Range:42 – 47V
Surge Capacity (with PV):14700W (10 min) / 15500W (5 min)
Surge Capacity (without PV):13500W (10 min)
Max. Continuous Line Wattage:6000W
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:0.8 ~ 0.8 Leading Adjustable
Total Harmonic Distortion:<5% (Full Load)
Transfer Time:10 – 20 ms (Single) / 20 ms (Parallel)
Max. Continuous Output Current:50A
AC Bypass (Generator):90A
Output Voltage:120V AC / 240V AC
Output Power:12000W
Max. Continuous Line Wattage:8000W (per 120V)
Operating Voltage Range:180 – 270V AC
Output Frequency:50 Hz / 60 Hz
Max. Output Power (with PV):14700W (10 min) / 15500W (5 min)
Max. Output Power (without PV):13500W (10 min)
Total Harmonic Distortion Voltage:<5%
Switching Time:10 ms
No. of MPPTs:3
Inputs per MPPT:2 (MPPT 1) / 1 (MPPT 2 & 3)
Max. Input Current:25A (MPPT 1) / 15A (MPPT 2 & 3)
Max. Short Circuit Input Current:31A (MPPT 1) / 19A (MPPT 2 & 3)
DC Input Voltage Range:100 – 600V DC
Start Up Voltage:100V DC
MPPT Operating Voltage Range:140 – 500V DC
MPPT Voltage:360V DC
Max. PV Array Power:18000W
Max. Efficiency:94 – 99.9%
Idle Consumption:~70W (Normal) / ~18W (Standby Mode)
Nominal Voltage:48V DC
Voltage Range:40 – 60V DC
Max. Charge / Discharge Current:250A
Recc. Battery Capacity per Inverter:>200 Ah
Operating / Storage Temperature Range:-13ºF – 140ºF (-25ºC – 60ºC)
Altitude:<6,561 ft (2000 m)
Relative Humidity:0 – 100%
Typical Noise Emission:68 dB @ 3 ft
Protection Rating:IP65 / NEMA 4X
Communications:RS485 / CANBus / WiFi
Max. Parallel Connections:10
Weight:121 lbs (55 kg)
Depth:11.2 in (285 mm)
Width:20.5 in (520 mm)
Height:34.3 in (871 mm)
BigBattery batteries are backed by a 12-year warranty, giving you reliable long-term performance and confidence in every charge. Designed for durability and engineered to last, our batteries are built to power your setup for over a decade. For more information, please visit our policy page
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.
Battery Downloads
SKU#:K0954, K0955, K0956, K0957, K0753, K0754, K0959, K0960, K0755, K0961, K0966, K0967, K0968
Spec Sheet:DOWNLOAD
DOWNLOADUser Manual:DOWNLOAD
DOWNLOADUL9540 Certificate – BigBattery ETHOS + EG4 18kPv:DOWNLOAD
DOWNLOADUL9540A Certificate:DOWNLOAD
DOWNLOADUL1973 Certificate:DOWNLOAD
DOWNLOADUN38.3 Certificate:DOWNLOAD
DOWNLOADSafety Data Sheet:DOWNLOAD
DOWNLOADCEC Listing – BigBattery ETHOS + EG4 18kPv:GO TO LINK
GO TO LINKBattery Specifications
GTIN-12 (U.P.C.):850061252005
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
BMS Cutoff Range:42 – 47V
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:UL9540, UL9540A, UL1973, & UN38.3
Inverter Downloads
SKU#:INV024
Spec Sheet:DOWNLOAD
DOWNLOADUser Manual:DOWNLOAD
DOWNLOADUL9540 Certificate – BigBattery ETHOS + EG4 18kPv:DOWNLOAD
DOWNLOADUL1741 Certificate:DOWNLOAD
DOWNLOADUL 1741 CRD PCS Test Verification Of Conformity Security:DOWNLOAD
DOWNLOADRapid Shut Down Wiring Guide:DOWNLOAD
DOWNLOADWhitepapers, Firmware, & Wiring Diagrams:GO TO LINK
GO TO LINKCEC Listing – BigBattery ETHOS + EG4 18kPv:GO TO LINK
GO TO LINKInverter Specifications
AC Voltage:120V AC / 240V AC
AC Frequency:50 Hz / 60 Hz
Nominal Voltage:51.2V
Max. Continuous AC Current:50A @ 240V AC
Max. AC Input Power:12000W
Max. AC Bypass:200A
Operating Voltage Range:180 – 270V AC
Output Voltage:120V AC / 240V AC
Max. Continuous Output Current:50A
Output Power:12000W
BMS Cutoff Range:42 – 47V
Surge Capacity (with PV):14700W (10 min) / 15500W (5 min)
Surge Capacity (without PV):13500W (10 min)
Max. Continuous Line Wattage:6000W
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:0.8 ~ 0.8 Leading Adjustable
Total Harmonic Distortion:<5% (Full Load)
Transfer Time:10 – 20 ms (Single) / 20 ms (Parallel)
Max. Continuous Output Current:50A
AC Bypass (Generator):90A
Output Voltage:120V AC / 240V AC
Output Power:12000W
Max. Continuous Line Wattage:8000W (per 120V)
Operating Voltage Range:180 – 270V AC
Output Frequency:50 Hz / 60 Hz
Max. Output Power (with PV):14700W (10 min) / 15500W (5 min)
Max. Output Power (without PV):13500W (10 min)
Total Harmonic Distortion Voltage:<5%
Switching Time:10 ms
No. of MPPTs:3
Inputs per MPPT:2 (MPPT 1) / 1 (MPPT 2 & 3)
Max. Input Current:25A (MPPT 1) / 15A (MPPT 2 & 3)
Max. Short Circuit Input Current:31A (MPPT 1) / 19A (MPPT 2 & 3)
DC Input Voltage Range:100 – 600V DC
Start Up Voltage:100V DC
MPPT Operating Voltage Range:140 – 500V DC
MPPT Voltage:360V DC
Max. PV Array Power:18000W
Max. Efficiency:94 – 99.9%
Idle Consumption:~70W (Normal) / ~18W (Standby Mode)
Nominal Voltage:48V DC
Voltage Range:40 – 60V DC
Max. Charge / Discharge Current:250A
Recc. Battery Capacity per Inverter:>200 Ah
Operating / Storage Temperature Range:-13ºF – 140ºF (-25ºC – 60ºC)
Altitude:<6,561 ft (2000 m)
Relative Humidity:0 – 100%
Typical Noise Emission:68 dB @ 3 ft
Protection Rating:IP65 / NEMA 4X
Communications:RS485 / CANBus / WiFi
Max. Parallel Connections:10
Weight:121 lbs (55 kg)
Depth:11.2 in (285 mm)
Width:20.5 in (520 mm)
Height:34.3 in (871 mm)
BigBattery batteries are backed by a 12-year warranty, giving you reliable long-term performance and confidence in every charge. Designed for durability and engineered to last, our batteries are built to power your setup for over a decade. For more information, please visit our policy page
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