BigBattery APEX-6.5K Off-Grid Inverter

Name: BigBattery APEX-6.5K Off-Grid Inverter
Brand: Big Battery
SKU: INV034
Price: 1490.0 USD
Availability: InStock

BY: Big Battery

SKU: INV034

| Availability: In Stock

$1,900.00

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BigBattery APEX-6.5K Off-Grid Inverter

The BigBattery APEX-6.5K Off-Grid Inverter is a powerful hybrid inverter designed for reliable off-grid energy systems. Delivering split-phase 120/240V power with clean pure sine wave output, it supports both solar and generator inputs for continuous energy independence. With 6.5kW output capacity, 80A pass-through capability, and installer-friendly bottom-entry wiring, the APEX-6.5K provides dependable power for cabins, homesteads, and remote residences.

BigBattery APEX-6.5K Off-Grid Inverter Features

6.5kW Hybrid Off-Grid Power – Reliable energy independence

Delivers 6.5kW continuous output with split-phase 120/240V capability for demanding off-grid applications.

Solar & Generator Compatibility – Flexible energy inputs

Supports both solar arrays and generator charging to ensure uninterrupted power availability.

Pure Sine Wave Output – Clean, appliance-safe electricity

Provides stable, utility-grade power suitable for sensitive electronics and essential appliances.

80A Pass-Through Capability – Power large loads

Allows high-capacity power transfer to run heavy appliances and critical systems smoothly.

Installer-Friendly Design – Easy system integration

Features bottom-entry wiring and durable outdoor-ready enclosure for simplified installation.

BigBattery APEX-6.5K Off-Grid Inverter Applications

Off-Grid Homes – Deliver reliable power for cabins, homesteads, and remote residences.
Solar Energy Systems – Convert solar energy into usable household electricity.
Backup Power Systems – Maintain power for essential loads during outages.
Remote Worksites – Provide dependable power in locations without utility access.
Energy Independence Projects – Build scalable off-grid and hybrid power systems.

What's Included

Everything you need is included with your product.

1x APEX-6.5K Off-Grid Inverter

User Manual

Warranty

5-Year Warranty

BigBattery APEX-6.5K Off-Grid Inverter Specifications

Inverter output

Specification	Details
Rated Output Power	6,500W
Surge Capacity (Peak Power)	13,000W
Rated Output Voltage	120/240 Vac (single-phase/split-phase)
Load capacity of Motors	4 HP
Rated Frequency	50/60Hz
Output Wave	Pure sine wave
Switching Time	10ms(typical value)

Battery

Specification	Details
Battery Type	Lithium-ion battery/lead-acid battery/user-defined battery
Rated Battery Voltage	48V
Voltage Range	40~60Vdc
Max. Solar Charging Current	140A
Max. Grid/Generator Charging Current	80A
Max. Hybrid Charge Current	140A

Solar Input

Specification	Details
No. Of MPPT	1+1
Max. Input Power	5,000W + 5,000W
Max. Input Current	18A + 18A
Max. Open Circuit Voltage	550Vdc+550Vdc
MPPT Voltage Range	125~450Vdc

Grid/Generator Input

Specification	Details
Input Voltage Range	65~140Vac
Input Frequency Range	50/60Hz
Bypass Overload Current	40A
A/C Inputs	2 Inputs - Grid & Generator
THD (V)	<5%

Efficiency

Specification	Details
Max. Efficiency	99.9%
MPPT Tracking Efficiency	93%
Parallel Capacity	Up to 6 Units (More than 3 units in parallel can form a three-phase output)

General Data

Specification	Details
Dimension	25.51 x 16.14 x 5.51 Inches
Weight	48 lbs
Protection Degree	IP20 Indoor Only
Temperature	14 - 131°F, >113°F Derate
External Module (Optional)	Wi-Fi/GPRS
Certificate	UL1741/RoHs/EN61000-6-1/EC61000-6-3/FCC Part15 ClassB/IEC62109-1/IEC62109-2
Noise	<60dB
Cooling Method	Intelligent fan
Warranty	5 years
Communication Integrated Circuit Breaker	RS485/CAN/USB/Dry Contact Utility/Load/Battery/PV

Frequently-Asked Questions

Can this inverter work with both solar and a generator?

Yes. The APEX-6.5K supports both solar input and generator input, allowing flexible energy management.

What type of output does it provide?

It produces pure sine wave output, ensuring safe operation for sensitive electronics and appliances.

Is it suitable for whole-home off-grid systems?

Yes. With split-phase 120/240V output and 6.5kW capacity, it can support many residential off-grid power systems.

Is installation complicated?

The inverter features installer-friendly bottom wiring access, simplifying setup for professional installers.

Manual

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Trusted By 10,000+ Customers. See All Reviews.

They Stood By Me

I was a DIY solar power wannabe... that is 'til I connected with Manny... The man's a prince! He not only knows his stuff; he walked me through all things electrical. To make sure I had all I needed... he gave me his cell phone # to text him anytime I got confused... nights and weekends included. The prices were very competitive... definitely go with Manny -- you won't go wrong!

Bruce D.

Awesome Service!

I am always hesitant to buy things at places I have never shopped... I want to give a shout out to Manny who with great patience and knowledge helped me get my orders... I felt valued as a customer and I will definitely be back in the future. I highly recommend them, they make you feel like family.

Jennene A.

Real Person, Honest Service.

I'm about to go off grid. I called Manny, he walked me through everything so I could truly understand what I needed and never tried to upsell me. He was honest and made a customer for life.

Ray B.

Easy Return

I would personally like to thank Manny... I purchased the inverter and decided I needed to return it... Manny was very understanding and went out of his way to help me return the product and not even have to pay for shipping return. He gives this company reputation, honor and quality customer service!

Roger V.

Totally Off Grid.

I have been talking with Manny the owner... He has not only helped me design a system but he's been assisting with the install and components. I am super pleased so far with the assistance.

Jeff S.

Great Product! Fast Shipping

We added 2 more batteries to our current set up. Pleased with the customer service from Off-Grid Source! Will be back!

Jason

Excellent Customer Service

Very fast response times. Very professional. I highly recommend!

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