Everything You Need, Included
Everything in the box
2× BigBattery ETHOS
1× ETHOS Control Box
1× 10kWh Ethos Controller to Battery Power Cable 31.5\" inch (800mm)
1× BigBattery APEX-10K Off-Grid Inverter- U.S. Support
- LiFePO₄ Safety
BigBattery ETHOS Battery & APEX-10K Inverter | 10.24–30.72kWh | Off- Grid System
SKU# K0311
Choose Your Inverter Option*
Converts battery power to usable electricity.
Choose Your Battery Option*
Stores your energy for when you need it.
Choose Your Inverter Option*
Converts battery power to usable electricity.
BigBattery APEX-10K Off-Grid Inverter
BigBattery APEX-6.5K Off-Grid Inverter
EG4 6000XP (8kPV) OFF-GRID INVERTER
EG4 12000XP V2 OFF-GRID INVERTER
Victron MultiPlus-II 48/5000/70-95 120V
Victron MultiPlus-II 48/3000/35-50 120V (UL 1741)
EG4 18kPV All-in-One Hybrid Solar Inverter
EG4 FlexBOSS18 Hybrid Solar Inverter
EG4 FlexBOSS21 Hybrid Solar Inverter
NoneI already have an inverter
BigBattery APEX-6.5K Off-Grid InverterEG4 6000XP (8kPV) OFF-GRID INVERTEREG4 12000XP V2 OFF-GRID INVERTERVictron MultiPlus-II 48/5000/70-95 120VVictron MultiPlus-II 48/3000/35-50 120V (UL 1741)EG4 18kPV All-in-One Hybrid Solar InverterEG4 FlexBOSS18 Hybrid Solar InverterEG4 FlexBOSS21 Hybrid Solar InverterNoneI already have an inverter Choose Your Battery Option*
Stores your energy for when you need it.
Choose Your ESS Configuration*
Compare the available system sizes and choose the configuration that fits your power needs.
$4,330.00
Documents & Certifications
Battery
About this item
The BigBattery ETHOS™ + EG4 6000XP ESS System is a compact, modular energy solution designed for both on-grid and off-grid applications. Combining the scalable ETHOS 48V LiFePO₄ battery system with the efficient EG4 6000XP inverter-charger, this system delivers reliable, flexible energy for tiny homes, cabins, and backup power setups.
The EG4 6000XP provides up to 6,000W split-phase output with solar input support and seamless integration of battery, solar, and generator power. Paired with the ETHOS battery system – expandable up to 80+ kWh – this setup ensures long-lasting, maintenance-free energy storage with consistent performance.
Built with advanced battery management, and U.S.-engineered design, this system delivers safe, intelligent energy control with closed-loop communication and real-time monitoring. Ideal for backup power, energy savings, and full off-grid independence.
Ships From: Texas, USA
Warranty: 12 Years (Battery), 5 Years (Inverter)
Support: Lifetime USA-Based Tech Support
Compatibility
Integrated & Optimized System:
- ETHOS Battery System + EG4 6000XP Inverter-Charger
Expandable & Flexible:
- Scalable ETHOS battery capacity up to 80+ kWh
- Compatible with additional ETHOS modules for future expansion
- Supports grid-tied, hybrid, and off-grid installations
Key Features
- Complete ESS SolutionBattery + inverter system designed to work seamlessly together
- 6,000W Split-Phase OutputReliable power for small homes, cabins, and backup systems
- LiFePO₄ Battery ChemistrySafe, stable lithium technology with long lifespan
- 6,000+ Cycle LifeBuilt for years of daily use and long-term savings
- Closed-Loop CommunicationOptimized coordination between battery and inverter
- Advanced BMS ProtectionMulti-layer protection for safe and reliable operation
- Modular ExpansionEasily scale storage capacity as energy needs grow
- Solar + Generator ReadyFlexible input options for continuous energy availability
- UPS Backup CapabilitySeamless transition during outages
- Remote Monitoring & ControlReal-time system tracking and performance insights
- Maintenance-Free OperationNo routine servicing required
A compact, scalable energy storage system built for reliability, flexibility, and long-term energy independence – perfect for smaller off-grid and backup applications.
Real Installations From Customers Like You!
Enter your build here to show off your build and receive a gift-box from us! Selected photos will be featured on our website and product pages.
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Battery Downloads
DOWNLOAD
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
Inverter Specifications
Document Title:APEX-6.5K & APEX 10K INVERTER SPECIFICATIONS
Brand:BigBattery
GTIN/UPC(APEX-6.5K/APEX-10K): 00199874185712 / 00199874999463
Model:APEX-6.5K / APEX-10K
Rated Output Power:APEX-6.5K: 6,500W; APEX-10K: 10,000W
Max. Output Power:APEX-6.5K: 13,000VA; APEX-10K: 20,000VA
Rated Output Voltage:120/240 Vac (single-phase / split-phase)
Load capacity of motors:APEX-6.5K: 4 HP; APEX-10K: 6 HP
Rated Frequency:50/60Hz
Output Wave:Pure sine wave
Switching Time:10ms (typical value)
Battery Type:Lithium-ion battery / lead-acid battery / user-defined battery
Rated Battery Voltage:48V
Voltage Range:40–60Vdc
Max. Solar Charging Current:APEX-6.5K: 140A; APEX-10K: 200A
Max. Grid / Generator Charging Current:APEX-6.5K: 80A; APEX-10K: 120A
Max. Hybrid Charge Current:APEX-6.5K: 140A; APEX-10K: 200A
Section:Solar input
No. of MPPT:1 + 1
Max. Input Power:APEX-6.5K: 5,000W + 5,000W; APEX-10K: 5,000W + 5,500W
Max. Input Current:APEX-6.5K: 18A + 18A; APEX-10K: 22A + 22A
Max. Open Circuit Voltage:550Vdc + 550Vdc
MPPT Voltage Range:125–450Vdc
Input Voltage Range:65–140Vac
Input Frequency Range:50/60Hz
Bypass Overload Current:APEX-6.5K: 40A; APEX-10K: 63A
AC Inputs:APEX-6.5K: 2 inputs (Grid & Generator); APEX-10K: 1 input (Grid or Generator)
Max. Efficiency:99.9%
MPPT Tracking Efficiency:APEX-6.5K: 93%; APEX-10K: 92%
Parallel Capacity:Up to 6 units (3 or more units in parallel can form a three-phase output)
Dimension:APEX-6.5K: 25.51 × 16.14 × 5.51 inches; APEX-10K: 28.46 × 17.64 × 5.91 inches
Weight:APEX-6.5K: 48 lbs; APEX-10K: 62 lbs
Protection Degree:IP20 (indoor only)
Temperature:14–131°F, derate above 113°F
External Module (Optional):Wi-Fi / GPRS
Certificate:UL1741 / RoHS / EN61000-6-1 / EC61000-6-3 / FCC Part15 Class B / IEC62109-1 / IEC62109-2
Noise:<60dB
Cooling Method:Intelligent fan
Warranty:5 years
Communication:RS485 / CAN / USB / Dry contact
Integrated Circuit Breaker:Utility / Load / Battery / PV
Section:Overload protection
Overload protection behavior:After overload protection is enabled, the inverter output will be restored after 3 minutes, and after 5 times of overload, the output will be off until the inverter is restarted. (102% < APEX-10K load < 110%): an error will be reported and the output will be turned off after 5 minutes. (110% < load < 125%): an error will be reported and the output will be turned off after 10 seconds. Load > 125%: an error will be reported and the output will be turned off after 5 seconds.
Protection features:Has PV input current limiting protection, PV input over-voltage protection, PV night reverse current protection, AC input over-voltage protection, AC input under-voltage protection, battery over-voltage protection, battery under-voltage protection, battery over-current protection, AC output short-circuit protection, heat sink over-temperature protection, inverter over-load protection.
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
Real Installations From Customers Like You!
Enter your build here to show off your build and receive a gift-box from us! Selected photos will be featured on our website and product pages.
.
.
Battery Downloads
Battery 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
Inverter Specifications
Document Title:APEX-6.5K & APEX 10K INVERTER SPECIFICATIONS
Brand:BigBattery
GTIN/UPC(APEX-6.5K/APEX-10K): 00199874185712 / 00199874999463
Model:APEX-6.5K / APEX-10K
Rated Output Power:APEX-6.5K: 6,500W; APEX-10K: 10,000W
Max. Output Power:APEX-6.5K: 13,000VA; APEX-10K: 20,000VA
Rated Output Voltage:120/240 Vac (single-phase / split-phase)
Load capacity of motors:APEX-6.5K: 4 HP; APEX-10K: 6 HP
Rated Frequency:50/60Hz
Output Wave:Pure sine wave
Switching Time:10ms (typical value)
Battery Type:Lithium-ion battery / lead-acid battery / user-defined battery
Rated Battery Voltage:48V
Voltage Range:40–60Vdc
Max. Solar Charging Current:APEX-6.5K: 140A; APEX-10K: 200A
Max. Grid / Generator Charging Current:APEX-6.5K: 80A; APEX-10K: 120A
Max. Hybrid Charge Current:APEX-6.5K: 140A; APEX-10K: 200A
Section:Solar input
No. of MPPT:1 + 1
Max. Input Power:APEX-6.5K: 5,000W + 5,000W; APEX-10K: 5,000W + 5,500W
Max. Input Current:APEX-6.5K: 18A + 18A; APEX-10K: 22A + 22A
Max. Open Circuit Voltage:550Vdc + 550Vdc
MPPT Voltage Range:125–450Vdc
Input Voltage Range:65–140Vac
Input Frequency Range:50/60Hz
Bypass Overload Current:APEX-6.5K: 40A; APEX-10K: 63A
AC Inputs:APEX-6.5K: 2 inputs (Grid & Generator); APEX-10K: 1 input (Grid or Generator)
Max. Efficiency:99.9%
MPPT Tracking Efficiency:APEX-6.5K: 93%; APEX-10K: 92%
Parallel Capacity:Up to 6 units (3 or more units in parallel can form a three-phase output)
Dimension:APEX-6.5K: 25.51 × 16.14 × 5.51 inches; APEX-10K: 28.46 × 17.64 × 5.91 inches
Weight:APEX-6.5K: 48 lbs; APEX-10K: 62 lbs
Protection Degree:IP20 (indoor only)
Temperature:14–131°F, derate above 113°F
External Module (Optional):Wi-Fi / GPRS
Certificate:UL1741 / RoHS / EN61000-6-1 / EC61000-6-3 / FCC Part15 Class B / IEC62109-1 / IEC62109-2
Noise:<60dB
Cooling Method:Intelligent fan
Warranty:5 years
Communication:RS485 / CAN / USB / Dry contact
Integrated Circuit Breaker:Utility / Load / Battery / PV
Section:Overload protection
Overload protection behavior:After overload protection is enabled, the inverter output will be restored after 3 minutes, and after 5 times of overload, the output will be off until the inverter is restarted. (102% < APEX-10K load < 110%): an error will be reported and the output will be turned off after 5 minutes. (110% < load < 125%): an error will be reported and the output will be turned off after 10 seconds. Load > 125%: an error will be reported and the output will be turned off after 5 seconds.
Protection features:Has PV input current limiting protection, PV input over-voltage protection, PV night reverse current protection, AC input over-voltage protection, AC input under-voltage protection, battery over-voltage protection, battery under-voltage protection, battery over-current protection, AC output short-circuit protection, heat sink over-temperature protection, inverter over-load protection.
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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