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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.
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.
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.
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.
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.
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.
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.
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 provides a limited warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.
BigBattery APEX-6.5K Off-Grid Inverter Specification
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| Document Title | APEX-6.5K & APEX 10K INVERTER SPECIFICATIONS |
| Brand | BigBattery |
| Model | APEX-6.5K / APEX-10K |
| GTIN/UPC | 00199874185712 / 00199874999463 |
| Rated Output Power | 6,500W / 10,000W |
| Max Output Power | 13,000VA / 20,000VA |
| Output Voltage | 120/240 Vac (Single-Phase / Split-Phase) |
| Motor Load Capacity | 4 HP / 6 HP |
| Frequency | 50/60Hz |
| Output Waveform | Pure Sine Wave |
| Switching Time | 10 ms |
| Battery Voltage Range | 40 – 60Vdc |
| Max Solar Charging Current | 140A / 200A |
| Max Grid/Generator Charging Current | 80A / 120A |
| Max Hybrid Charging Current | 140A / 200A |
| MPPT Trackers | 2 (1 + 1) |
| Max PV Input Power | 5,000W + 5,000W / 5,000W + 5,500W |
| Max PV Input Current | 18A + 18A / 22A + 22A |
| Max PV Open Circuit Voltage | 550Vdc + 550Vdc |
| MPPT Voltage Range | 125 – 450Vdc |
| Grid/Generator Input Voltage | 65 – 140Vac |
| Input Frequency | 50/60Hz |
| Bypass Overload Current | 40A / 63A |
| AC Inputs | 2 (Grid & Generator) / 1 (Grid or Generator) |
| Max Efficiency | 99.9% |
| MPPT Efficiency | 93% / 92% |
| Parallel Capacity | Up to 6 units (3+ units for three-phase) |
| Dimensions | 25.51 × 16.14 × 5.51 in / 28.46 × 17.64 × 5.91 in |
| Weight | 48 lbs / 62 lbs |
| Protection Rating | IP20 (Indoor Only) |
| Operating Temperature | 14°F – 131°F (Derate above 113°F) |
| Optional Connectivity | Wi-Fi / GPRS |
| Certifications | UL1741 / RoHS / EN61000-6-1 / EN61000-6-3 / FCC Part 15 Class B / IEC62109-1 / IEC62109-2 |
| Noise Level | <60 dB |
| Cooling Method | Intelligent Fan |
| Warranty | 5 Years |
| Communication | RS485 / CAN / USB / Dry Contact |
| Integrated Breakers | Utility / Load / Battery / PV |
| Overload Protection Behavior | Restores after 3 minutes; shuts down after repeated overloads; 102–110% load shuts down in 5 min; 110–125% in 10 sec; >125% in 5 sec |
| Protection Features | PV current limiting, PV over-voltage, reverse current protection, AC over/under voltage, battery over/under voltage, over-current, short circuit, over-temperature, overload protection |
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