BigBattery APEX-6.5K Off-Grid Inverter

The BigBattery APEX-6.5K Off-Grid Inverter Delivers Split-Phase Pure Sine Wave Power For True Energy Independence

When the grid goes down or when you've decided the grid was never part of the plan — you need more than a stopgap solution. You need a system that was built from the ground up to handle the full demands of real life: refrigerators, well pumps, air conditioners, power tools, and everything in between.

The BigBattery APEX-6.5K Off-Grid Inverter is exactly that system. Engineered for residential backup, off-grid cabins, remote homesteads, RV setups, and mobile worksites, the APEX-6.5K is a hybrid inverter that takes energy independence seriously so you don't have to worry about whether the lights stay on.

With a robust 6,500-watt continuous output, split-phase 120/240V pure sine wave electricity, and seamless compatibility with today's best LiFePO₄ battery systems, this inverter is built to be the backbone of a complete, self-sufficient power solution. Whether you're powering a modest off-grid cabin or a full-sized home backup system, the APEX-6.5K is designed to deliver day after day, season after season.

When you purchase the BigBattery APEX-6.5K through Outbound Power, you're not just buying an inverter you're getting the backing of a team that lives and breathes portable and backup power. This unit ships from Texas, comes backed by a 12-year warranty, and includes lifetime USA-based technical support because a power system is a long-term investment, and you deserve long-term support to match.

BigBattery APEX-6.5K Off-Grid Inverter Features

It powers your whole home with true 120/240V electricity

Most inverters only handle half your home's circuits. The APEX-6.5K delivers full split-phase power, so your well pump, air conditioner, dryer, and other 240V appliances all run without any workarounds or limitations.

Pure sine wave output keeps all your devices safe and happy

Cheap inverters produce rough, choppy power that slowly damages motors and electronics. The APEX-6.5K outputs clean, smooth electricity — identical to grid power — so every appliance, from your CPAP to your refrigerator, runs safely and efficiently.

Solar and generator inputs keep you powered day and night

When the sun sets or clouds roll in, your generator picks up the slack automatically. This dual-input flexibility means your system never goes dark, making it perfect for full-time off-grid living or reliable home backup.

The 80A pass-through handles your biggest, hungriest appliances

Heavy loads like central AC units and electric ranges need serious amperage. The built-in 80A pass-through routes generator or grid power directly to those large appliances, protecting your batteries while keeping every critical circuit running strong.

Bottom-entry wiring makes installation clean, fast, and stress-free

Nobody enjoys a messy, complicated install. The APEX-6.5K's bottom-entry wiring design keeps cables organized and routing simple, saving installers and DIY builders significant time and resulting in a professional, tidy setup from day one.

Smart built-in protections guard your entire system automatically

The APEX-6.5K watches over itself with automatic safeguards against overloads, short circuits, and overheating. These built-in protections quietly work in the background, keeping your investment and everything connected to it safe around the clock.

A 12-year warranty and lifetime support back every purchase

Buying a power system is a long-term decision. BigBattery stands firmly behind the APEX-6.5K with a 12-year warranty and lifetime USA-based technical support, so you always have an expert in your corner whenever you need one.

BigBattery APEX-6.5K Off-Grid Inverter Warranty

BigBattery provides a limited warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.

What's Included

• 1 x BigBattery APEX-6.5K Off-Grid Inverter
• 2 x M6*60mm Expansion Screws
• 2 x M5*30mm Plastic Expansion Screws
• 2 x Phillips M6*10mm Screws
• 2 x Backup M6*10mm Screws
• 2 x SC35-6 Copper Lugs
• 4 x Black M3X6mm Screws
• 1 x Parallel Communication Cable
• 1 x WIFI Logger (optional)
• 2 x CT (optional)
• 1 x User Manual
• 1 x Warranty Card
• 1 x Quality Certificate
• 1 x Outgoing Inspection Report
  

BigBattery APEX-6.5K Off-Grid Inverter Manual