BigBattery
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The BigBattery APEX 6.5K + NEXUS™ Off-Grid System is a complete, high-performance energy solution designed for reliable off-grid power and energy independence. Combining the APEX 6.5K hybrid inverter with the NEXUS 48V 15kWh LiFePO₄ battery, this system delivers dependable, efficient energy for homes, cabins, and remote installations.
The APEX 6.5K provides split-phase 120/240V pure sine-wave output, supporting both everyday appliances and heavy loads, while seamlessly integrating solar and generator inputs for continuous operation. Paired with the scalable NEXUS battery system (expandable up to 225kWh), this setup ensures long-lasting, maintenance-free energy storage with consistent performance.
Built with advanced battery protection, safe lithium technology, and U.S.-supported engineering, this system is ideal for off-grid living, backup power, and energy security in demanding environments.
Ships From: Texas, USA
Warranty: 12 Years (Battery), 5 Years (Inverter)
Support: Lifetime USA-Based Tech Support.
Meet the BigBattery APEX Off-Grid Hybrid Inverter Series (6.5K & 10K)—engineered for true energy independence with two power-class options to match your build. Both models deliver split-phase 120/240V at 50/60 Hz with clean, pure sine-wave output, pairing seamlessly with modern LiFePO₄ battery banks for stable, efficient performance. Designed for real-world autonomy, APEX supports solar and generator inputs so you can stay powered day and night, season after season.
Built to handle demanding loads, the APEX Series features an 80A pass-through to keep large appliances and critical circuits running smoothly, while wide operating temperatures and an outdoor-ready enclosure provide dependable performance in harsh conditions. With installer-friendly bottom-entry wiring and intelligent protections baked in, APEX is a rugged, efficient, and practical backbone for cabins, homesteads, remote residences, and off-grid properties—delivering a streamlined path to reliable, all-day power.
Integrated & Optimized System (Closed-Loop Communication):
Expandable Design:
A reliable, scalable off-grid energy system built for performance, flexibility, and long-term independence—backed by U.S.-based support you can trust.
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At BigBattery, we stand behind the quality and reliability of our products. Our warranty coverage is designed to give you confidence and peace of mind with every purchase.
For full details on coverage, terms, and conditions, please visit our Policy Page.
Our stackable, compact design comes with all the hardware you need for a straightforward setup, letting you get your off-grid system up and running efficiently in less time. Engineered for reliability in any off-grid environment, it delivers consistent power when you need it most.
With 300Ah of capacity, 140A max continuous discharge, and peak support up to 270A, NEXUS handles high-demand loads with ease. NEXUS’s smart thermal management enables charging from 32 °F to 113 °F and discharging down to -4 °F, making it a true all-weather energy solution.
NEXUS supports parallel expansion up to 15 units, offering 225kWh total capacity per inverter. With RS485, CAN, and RJ45 communication ports, it’s ready to integrate seamlessly into new or existing inverter systems—ensuring full system transparency, automation, and control.
