Big Battery APEX-6.APEX-6.5KW Off-Grid Inverter

If you're serious about energy independence, the BigBattery APEX-6.5K is the inverter that gets the job done 6,500W of clean, pure sine wave power ready for your home, cabin, or off-grid build.

• All-in-One Hybrid Power – Combines inverter, solar charger, and battery charger so your solar, battery, and generator all work together without needing separate components.
• Dual MPPT Solar Input – Two independent MPPTs handle up to 10 kW of PV input with a wide 125–450V range, giving you real flexibility when designing your array.
• Split-Phase 120/240V Output – Runs everything from everyday household circuits to heavy-duty 240V appliances, making it a natural fit for U.S. homes and cabins.
• Scalable Parallel Capacity – Need more power down the road? Stack up to six units in parallel and grow your system without starting over.
• Smart Energy Management – Built-in time-of-use scheduling and intelligent charge/discharge modes help stretch your battery life and cut energy costs.

Whether you're pulling from solar, the grid, or a generator, the APEX-6.5K switches between sources automatically so your critical loads never miss a beat. The 40A bypass passthrough keeps your heavy appliances running without putting extra strain on the inverter itself.

Battery flexibility is a real strength here it works with lithium-ion, lead-acid, or user-defined battery banks at 48V, with a max hybrid charge current of 140A. RS485, CAN, and USB communication tie directly into your BMS for live protection and performance data you can actually use.

Installation is refreshingly straightforward bottom-entry wiring keeps the job clean, and integrated circuit breakers for utility, load, battery, and PV mean fewer external components to source. Intelligent fan cooling and a reliable operating range of 14–131°F round out a system built to perform day in and day out.

Technical Specification