BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System
BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System - Image 2
BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System - Image 3
BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System - Image 4
BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System - Image 5

Everything You Need, Included

Everything in the box

BatteryBigBattery ETHOS2× BigBattery ETHOS
MountETHOS Control Box1× ETHOS Control Box
Cables10kWh Ethos Controller to Battery Power Cable 31.5\" inch (800mm)1× 10kWh Ethos Controller to Battery Power Cable 31.5\" inch (800mm)
InverterBigBattery APEX-6.5K Off-Grid Inverter1× BigBattery APEX-6.5K Off-Grid Inverter
  • U.S. Support
  • LiFePO₄ Safety

BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System

SKU# K0305

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SKU: K0954-V-1 Categories: ,
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Documents & Certifications

Battery

Inverter

About this item

The BigBattery ETHOS™ + APEX-6.5K 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 BigBattery APEX-6.5K 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 APEX-6.5K inverter manages power from solar, battery storage, the utility grid, and a generator. Its 120/240Vac split-phase output makes it ideal for home backup, energy savings, and off-grid energy systems.

 

The APEX-6.5K delivers 6,500W of rated output power with up to 13,000VA of maximum output power. Dual solar inputs provide up to 10,000W of combined PV input capacity, while RS485 and CAN communication support coordinated operation between the battery and inverter.

Ships From: Texas, USA
Warranty: 12 Years (Battery), 5 Years (Inverter)
Support: Lifetime USA-Based Tech Support

 

Compatibility

Integrated BigBattery Energy Storage System:

  • ETHOS Battery System + BigBattery APEX-6.5K Hybrid Inverter

Expandable & Flexible:

  • Scalable ETHOS battery capacity up to 80+ kWh
  • Supports up to six APEX-6.5K inverters in parallel for increased output capacity
  • Three or more parallel APEX-6.5K units can be configured for three-phase output
Key Features
  • Complete ESS SolutionBigBattery battery and inverter components combined into one scalable energy system
  • 6,500W Hybrid InverterProvides 6,500W of rated output and up to 13,000VA of maximum output power
  • 120/240Vac Split-Phase OutputSupports standard 120V and 240V residential loads
  • Dual Solar InputsTwo independent MPPT inputs support up to 5,000W each for 10,000W of combined PV input capacity
  • Flexible AC InputSeparate grid and generator inputs provide greater control over backup charging and energy management
  • High-Capacity ChargingSupports up to 140A of solar charging and up to 80A of grid or generator charging
  • LiFePO4 Battery ChemistrySafe and stable lithium technology designed for a long service life
  • 6,000+ Cycle LifeBuilt for years of daily use and long-term energy savings
  • Advanced System ProtectionProtection against overvoltage, undervoltage, overcurrent, short circuits, excessive temperature, and inverter overload
  • Battery CommunicationRS485 and CAN communication support coordinated operation between the ETHOS battery and APEX inverter
  • Parallel ExpansionConnect up to six APEX-6.5K units to increase system output capacity
  • Pure Sine Wave OutputDelivers clean and stable AC power for sensitive household equipment
  • Intelligent CoolingFan-controlled cooling helps maintain efficient inverter operation

A complete, scalable energy storage system built for independence, reliability, and long-term performance—with BigBattery components, protection, support, and engineering you can trust.

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.

Newcomerstown, OH
St. Joseph, MI
Riverside, CA
Denver, CO
Mojave, AZ
San Antonio, TX
ETHOS- Home Battery Backup
ETHOS- Lithium battery storage
ETHOS- Lithium battery
ETHOS- Battery for home
ETHOS- Home Battery Backup
ETHOS- Lithium battery storage
ETHOS- Lithium battery
ETHOS- Home Battery Backup

.

Battery Downloads

SKU#:FETHS-48051-G1
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL9540A Certificate:DownloadDOWNLOAD
UL1973 Certificate:DownloadDOWNLOAD
UN38.3 Certificate:DownloadDOWNLOAD
Safety Data Sheet:DownloadDOWNLOAD
CEC Listing- BigBattery ETHOS:Go to linkGO TO LINK

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

SKU#:INV034
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
APEX-6.5K Quick Start Guide:DownloadDOWNLOAD

Inverter Specifications

Document Title:APEX-6.5K & APEX 10K INVERTER SPECIFICATIONS
Brand:BigBattery
Model:APEX-6.5K / APEX-10K
GTIN/UPC(APEX-6.5K/APEX-10K):00199874185712 / 00199874999463
Inverter Output
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)
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
Grid/Generator Input:
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)
Section:Efficiency
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)
Section:General data
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.

Newcomerstown, OH
St. Joseph, MI
Riverside, CA
Denver, CO
Mojave, AZ
San Antonio, TX
ETHOS- Home Battery Backup
ETHOS- Lithium battery storage
ETHOS- Lithium battery
ETHOS- Battery for home
ETHOS- Home Battery Backup
ETHOS- Lithium battery storage
ETHOS- Lithium battery
ETHOS- Home Battery Backup

.

.

Battery Downloads

SKU#:FETHS-48051-G1
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
UL9540A Certificate:DownloadDOWNLOAD
UL1973 Certificate:DownloadDOWNLOAD
UN38.3 Certificate:DownloadDOWNLOAD
Safety Data Sheet:DownloadDOWNLOAD
CEC Listing- BigBattery ETHOS:Go to linkGO TO LINK

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

SKU#:INV034
Spec Sheet:DownloadDOWNLOAD
User Manual:DownloadDOWNLOAD
APEX-6.5K Quick Start Guide:DownloadDOWNLOAD

Inverter Specifications

Document Title:APEX-6.5K & APEX 10K INVERTER SPECIFICATIONS
Brand:BigBattery
Model:APEX-6.5K / APEX-10K
GTIN/UPC(APEX-6.5K/APEX-10K):00199874185712 / 00199874999463
Inverter Output
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)
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
Grid/Generator Input:
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)
Section:Efficiency
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)
Section:General data
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

×

BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System

Price range: $3,655 through $10,782