Product Summary:
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 Solution — BigBattery battery and inverter components combined into one scalable energy system
- 6,500W Hybrid Inverter — Provides 6,500W of rated output and up to 13,000VA of maximum output power
- 120/240Vac Split-Phase Output — Supports standard 120V and 240V residential loads
- Dual Solar Inputs — Two independent MPPT inputs support up to 5,000W each for 10,000W of combined PV input capacity
- Flexible AC Input — Separate grid and generator inputs provide greater control over backup charging and energy management
- High-Capacity Charging — Supports up to 140A of solar charging and up to 80A of grid or generator charging
- LiFePO4 Battery Chemistry — Safe and stable lithium technology designed for a long service life
- 6,000+ Cycle Life — Built for years of daily use and long-term energy savings
- Advanced System Protection — Protection against overvoltage, undervoltage, overcurrent, short circuits, excessive temperature, and inverter overload
- Battery Communication — RS485 and CAN communication support coordinated operation between the ETHOS battery and APEX inverter
- Parallel Expansion — Connect up to six APEX-6.5K units to increase system output capacity
- Pure Sine Wave Output — Delivers clean and stable AC power for sensitive household equipment
- Intelligent Cooling — Fan-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.
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Battery Downloads
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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
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.
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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
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
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BigBattery ETHOS Battery & APEX-6.5K Off-Grid Inverter (ESS) | 10.24–46.1kWh | Home Solar System
Price range: $3,655 through $10,782
