Everything You Need, Included
Everything in the box
1× BigBattery 51.2V NEXUS 2 LiFePO4 Battery
1× BigBattery APEX-10K Off-Grid Inverter
1× 2AWG (Black and Red) 3FT Ring to Ring Terminal Cable- U.S. Support
- LiFePO₄ Safety
BigBattery NEXUS 2 Battery + APEX-10K Inverter | 16 kWh | Off-Grid Home ESS System
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-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 Choose Your Battery Option*
Stores your energy for when you need it.
Choose Your Battery Option*
Stores your energy for when you need it.
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.
Choose Your Battery Option*
Stores your energy for when you need it.
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.
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Documents & Certifications
Battery
About this item
The BigBattery NEXUS 2 + APEX-10K ESS System combines high-capacity energy storage, powerful split-phase output, and seamless BigBattery integration in one scalable energy solution. Designed to work together, the system pairs the 16kWh NEXUS 2 LiFePO₄ battery with the 10,000W APEX-10K hybrid inverter, providing dependable power for homes, cabins, workshops, homesteads, and demanding backup applications.
The APEX-10K delivers 10,000W of continuous pure sine-wave output with up to 20,000W of surge capacity, providing the power needed for household appliances, pumps, tools, air conditioners, and motors up to 6 HP. Its configurable single-phase and split-phase architecture supports standard 120/240V applications, while a typical 10ms switching time helps maintain continuous power when transitioning between available energy sources.
Paired with the NEXUS 2—featuring 16 kWh of LiFePO₄ storage, 314Ah capacity, 150A continuous discharge, and up to 7.6kW of continuous battery power—the system provides substantial energy storage in a rugged, floor-standing design. A 270A one-second peak discharge rating supplies additional current for short equipment-startup demands.
The APEX and NEXUS product lines are designed for seamless operation. RS485 and CAN communication allow the inverter to coordinate directly with the NEXUS 2 BMS, providing accurate battery monitoring and intelligent control over charging, discharging, state of charge, and system protection.
For access to the APEX-10K’s full 10,000W battery-powered output, the inverter should be paired with at least two NEXUS 2 batteries in parallel. Two batteries provide 32 kWh of storage, 628Ah of combined capacity, and up to 15.2kW of continuous battery power. This configuration also provides sufficient combined current capacity for the inverter’s maximum 200A solar and hybrid charging capability.
The APEX-10K supports up to 11,000W of combined solar input across two independent MPPT channels. Each channel accepts up to 5,500W and 22A, providing flexible solar-array configuration and improved performance across multiple strings. Its wide 125–450VDC MPPT operating range supports efficient high-voltage solar design.
Grid or generator input can provide supplemental charging and load support when solar production is limited. Smart energy-management features, including timed charging and discharging, allow the system to prioritize solar, battery, or AC input according to operating requirements and time-of-use electricity rates.
The NEXUS 2 features an integrated BMS with multiple safety redundancies, an IP54-rated enclosure, and advanced LiFePO₄ cells rated for more than 8,000 cycles. Its indoor/outdoor installation capability and expandable architecture make it a durable energy-storage solution for residential and remote-power environments.
Ships From: Texas, USA
Warranty: 12 Years (Battery), 5 Years (Inverter)
Support: Lifetime USA-Based Tech Support
Compatibility
Designed to Work Together:
- BigBattery NEXUS 2 48V LiFePO₄ Battery + BigBattery APEX-10K Hybrid Inverter
- Matching 48V battery and inverter architecture
- Seamless BMS integration through RS485 or CAN communication
- Coordinated battery charging, discharging, monitoring, and protection
- One NEXUS 2 supports up to 7.6kW of continuous battery-powered output
- Two NEXUS 2 batteries are recommended to support the inverter’s full 10,000W output
- Two batteries provide sufficient combined capacity for the inverter’s maximum 200A charging capability
Expandable & Flexible:
- Expand the NEXUS 2 battery bank up to 15 batteries in parallel
- Maximum battery configuration rated at up to 241.5kWh
- Parallel up to six APEX-10K inverters for increased system output
- Three or more parallel inverters can be configured for three-phase output
- Supports single-phase and split-phase 120/240V applications
- Supports solar, battery, grid-assisted, or generator-assisted operation
- Suitable for homes, cabins, workshops, homesteads, and remote installations
Key Features
- Integrated BigBattery ESSNEXUS 2 battery and APEX-10K inverter designed for seamless system operation
- RS485/CAN BMS CommunicationEnables intelligent battery monitoring, charging, discharging, and protection
- 10,000W Continuous OutputPowerful pure sine-wave output for demanding residential and off-grid applications
- 20,000W Surge CapacitySupports short startup demands from pumps, compressors, tools, and large appliances
- 6 HP Motor CapacityDesigned to operate demanding motor-driven equipment
- 120/240V Split-Phase OutputPowers standard 120V loads and heavy-duty 240V appliances
- Typical 10ms Switching TimeHelps maintain continuous power during source transitions
- 11,000W Maximum Solar InputSupports two independent 5,500W solar-array inputs
- Dual 22A MPPT ChannelsProvides flexible solar-string configuration for modern high-power panels
- 125–450VDC MPPT RangeSupports efficient high-voltage solar-array design
- 550VDC Maximum Open-Circuit VoltageAccommodates substantial PV string voltage
- Up to 200A Solar ChargingProvides rapid charging for expanded NEXUS 2 battery banks
- Up to 120A Grid or Generator ChargingSupplies powerful supplemental battery charging
- Up to 200A Hybrid ChargingCombines available charging sources for faster energy recovery
- 16kWh LiFePO₄ BatteryHigh-capacity energy storage with a 314Ah rating
- 7.6kW Continuous Power per BatteryProvides dependable current for residential and off-grid loads
- 150A Continuous Battery DischargeSupports demanding connected equipment
- 270A Peak Battery DischargeProvides one-second startup support for short surge loads
- 8,000+ Battery CyclesEngineered to provide more than 12 years of daily cycling
- Advanced Battery Management SystemMultiple safety redundancies protect the battery and connected equipment
- 63A Bypass CapacitySupports substantial loads while operating from the selected AC input
- Grid or Generator IntegrationOne configurable AC input supports utility or generator operation
- Timed Charging and DischargingAllows energy usage to be scheduled around operating needs and electricity rates
- 99.9% Maximum Inverter EfficiencyPromotes efficient system operation and reduced conversion losses
- 92% MPPT Tracking EfficiencyOptimizes available energy from the connected solar array
- Optional Wi-Fi/GPRS MonitoringEnables remote system visibility and control
- Integrated Circuit BreakersBuilt-in protection for utility, load, battery, and PV connections
- Expandable Battery StorageConnect up to 15 NEXUS 2 batteries in parallel
- Expandable Inverter OutputParallel up to six APEX-10K inverters
- Indoor/Outdoor Battery InstallationRugged IP54-rated NEXUS 2 enclosure
- Maintenance-Free OperationLong-lasting LiFePO₄ chemistry without routine servicing
A powerful and seamlessly connected BigBattery energy system engineered for large solar arrays, demanding electrical loads, expandable energy storage, and lasting energy independence.
DOWNLOADBattery Specifications
*The battery will start charging at at 32°F after the heating element has taken effect.
Inverter Downloads
Inverter Specifications
Battery Specifications
*The battery will start charging at at 32°F after the heating element has taken effect.
Inverter Downloads
Inverter Specifications
As Seen In
Frequently Asked Questions
Is the NEXUS 2 and APEX 10K worth choosing over a 6.5K system on Black Friday?
A higher-output inverter may make sense for larger simultaneous loads, but it does not automatically increase battery runtime. Compare output needs and selected storage capacity before deciding.
What should I check when comparing APEX 10K and EG4 inverter bundles on Cyber Monday?
Compare off-grid capabilities, input requirements, communication compatibility, warranty terms, and the complete installed cost. Confirm exactly which battery and inverter configuration is listed.
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BigBattery NEXUS 2 Battery + APEX-10K Inverter
