Fortress Solo 6.5K Off-Grid Solar Kit | 6.4kW Solar | 10.8kWh Battery | Tigo Rapid Shutdown

Name: Fortress Solo 6.5K Off-Grid Solar Kit | 6.4kW Solar | 10.8kWh Battery | Tigo Rapid Shutdown
Brand: Fortress Power
SKU: KIT-FORT-SOLO65-10.8KWH-6.4KW-TIGO-F
Price: 7755.00 USD
Availability: InStock

$7,755.00

This off-grid solar kit combines the Fortress 6.5 kW Solo inverter with a 6.4 kW solar array and 10.8 kWh of battery storage to provide dependable standalone power for remote homes, cabins, and backup-focused applications. Designed for simple integration and reliable performance, the system includes Tigo rapid shutdown technology for enhanced safety and code compliance.

SKU: KIT-FORT-SOLO65-10.8KWH-6.4KW-TIGO-F Categories: All Products, Off Grid Kits, Solar Kits Brand: Fortress Power

OFF-GRID SOLAR KIT · COMPACT HOME & CABIN POWER

Reliable Off-Grid Power in a Compact Package

Generate, store, and manage your own power with a balanced solar and battery system built around the Fortress Solo platform.

The Fortress 6.5kW Solo Solar Kit combines a 6.4kW solar array, 10.8kWh of Fortress eFlex MAX battery storage, and the Fortress Solo 6.5K inverter into a complete energy system for cabins, remote homes, workshops, and smaller off-grid properties.

The Solo 6.5K delivers 120/240V split-phase power and integrates solar charging, battery management, generator input, and utility input in one platform. Tigo rapid shutdown is included for module-level PV shutdown and improved installation safety.

The platform can grow with your needs through additional battery storage and parallel Solo inverters when a larger system is required.

Important: The Solo 6.5K provides 6,500W of continuous inverter output. Large electric loads should be managed so simultaneous demand remains within the inverter and battery system’s available capacity.

At a Glance

Best For	Cabins, remote homes, workshops, rural properties, and smaller off-grid residences
System Type	Off-Grid with Generator or Utility Input Capability
Solar Array	Approximately 6.4kW
Battery Storage	10.8kWh nominal
Battery Configuration	2 × Fortress eFlex MAX 5.4kWh LiFePO₄ Batteries
Continuous Output	6,500W
Peak Output	13,000VA
Output Voltage	120/240V Split Phase
Generator Compatible	Yes
Utility Input	Supported
Expandable	Battery Storage & Inverter Capacity

System Overview

This Fortress kit is designed for customers who need dependable 120/240V power without stepping into a larger whole-home inverter platform.

During the day, the 6.4kW solar array can power loads while charging the eFlex MAX battery bank. Stored energy supplies the system when solar production falls, while generator or utility input can provide additional support when required. Dual high-voltage MPPT inputs give the Solo 6.5K flexibility for PV string design.

Ideal Applications

Off-Grid Cabins
Remote Homes
Rural Properties
Small Homesteads

Workshops
Barns & Outbuildings
Backup-Focused Applications
Properties with Generator Support

Choose Your Configuration

The Solo 6.5K can be used as a standalone off-grid platform or with an AC source available for additional support.

Option 1

Complete Off-Grid

Use solar and battery power as your primary energy source.

Solar supplies daytime loads and charges the batteries. After sunset, stored battery energy powers the property. A compatible generator can be connected for additional charging and load support during extended low-solar conditions.

Ideal For

Cabins, remote homes, workshops, and properties without utility service

Option 2

Solar & Battery with AC Support

Keep generator or utility power available when additional energy is needed.

The system can prioritize solar and stored energy while using an available AC source for charging or load support. Time-sharing functions can also schedule battery charge and discharge operation.

Ideal For

Properties that want solar-first operation with an additional AC power source available

What’s Included

Major Equipment

1 × Fortress Power Solo 6.5K 120/240V Inverter
2 × Fortress eFlex MAX 5.4kWh 48V Batteries
Total Battery Storage: approximately 10.8kWh
Approximately 6.4kW Solar Array
Tigo TS4-A-F Rapid Shutdown Devices — one per panel

Installation Components

Battery Interconnect Cabling
Battery Lugs / Connections
10 AWG PV Wire
Solar Connectors
Rapid Shutdown Hardware
Panel Racking NOT Included

Notes

Solar panel manufacturer and exact module wattage may vary based on current inventory while maintaining the advertised array size.
Additional electrical equipment may be required depending on the installation, local electrical code, permitting requirements, and system configuration.
System sizing should be based on actual electrical loads, daily energy consumption, location, and expected solar production.

Weight	1100 lbs
Dimensions	20 × 48 × 20 in
Brand	Fortress Power
Application	Grid-Tied, Hybrid
Kit Type	All-In-One Inverter
Inverter Size (KW)	0KW-5KW
Battery Capacity (KWH)	11KWH-15KWH
Solar Capacity (DC)	0KW-5KW

What Can It Power?

Designed to Run

With 6,500W of continuous 120/240V output, this system is designed to comfortably power a practical mix of everyday residential and property loads when managed within available capacity.

Kitchen

Refrigerator
Freezer
Microwave
Coffee Maker
Dishwasher
Small Kitchen Appliances

Living Areas

LED Lighting
Television
Starlink
Internet Equipment
Computers
Home Office

Utility

Washing Machine
Garage Door
Security Systems
Well Pump
Pressure Tank

Climate Control

Mini-Split Air Conditioners
Window Air Conditioners
High-Efficiency HVAC when starting and running demand remains within system capacity

Shop & Property

Barn Lighting
Handheld Power Tools
Small Air Compressors
Gate Operators
Farm & Property Controls

Not Designed to Run Simultaneously

The Solo 6.5K can handle substantial residential loads, but its 6,500W continuous output means high-demand electric appliances should be managed rather than operated together.

Loads that should be managed carefully:

Electric Water Heaters
Electric Furnace Heat Strips
EV Chargers
Large Welders
Large Air Compressors
Multiple Large HVAC or Heating Loads at the Same Time

Actual performance depends on appliance wattage, starting surge, battery state of charge, solar production, and which loads operate at the same time.

Typical Daily Usage

A practical starting range for many applications is approximately

15–25kWh

Per Day

This is a general sizing range, not a guaranteed production or runtime figure. Solar production varies significantly by location, season, weather, array orientation, and system losses.

Typical applications include:

Off-Grid Cabins
Efficient Small Homes
Rural Residences

Small Homesteads
Workshops with Moderate Loads
Backup-Focused Properties

Why This System?

Why We Chose the Fortress Solo 6.5K Platform

The Fortress Solo 6.5K delivers the core features needed for a capable off-grid system in a compact 120/240V platform: high-voltage solar input, battery charging, generator and utility input support, and true split-phase output.

Platform Advantages

6,500W Continuous Output
13,000VA Peak Output
True 120/240V Split-Phase Power
Dual High-Voltage MPPT Inputs
Up to 10,000W PV Input Capability
Generator Input Support

Utility Input Support
Time-Sharing Charge / Discharge Scheduling
10ms Typical Switching Time
Parallel Up to Six Inverters
Closed-Loop Battery Communication
Compact All-in-One Design

For cabins, smaller off-grid homes, workshops, and remote properties, the Solo 6.5K provides a strong balance between output power, solar capacity, expandability, and system simplicity.

Modular Fortress Battery Storage

This configuration uses two Fortress eFlex MAX 5.4kWh LiFePO₄ batteries for approximately 10.8kWh of nominal storage. Each battery includes its own BMS and integrated protection while supporting closed-loop communication with compatible 48V inverter platforms.

Benefits of eFlex MAX Battery Storage

Modular Expansion Add battery modules as storage requirements grow, with Fortress supporting up to 16 eFlex MAX units in parallel.	LiFePO₄ Chemistry Lithium iron phosphate cells provide strong cycle life and thermal stability for stationary energy storage.
8,000-Cycle Rating Fortress rates the eFlex MAX for 8,000 cycles at 80% depth of discharge.	10-Year Warranty The eFlex MAX is backed by a 10-year manufacturer warranty.
Integrated Protection Battery-level management and protection simplify building a modular 48V storage bank.	Flexible Installation The IP65 battery enclosure supports flexible installation options and is designed for demanding energy-storage applications.
Closed-Loop Communication CAN, Modbus, and related communications allow coordinated battery management with compatible equipment.

Designed to Grow With You

Start with 10.8kWh of nominal battery storage and expand in approximately 5.4kWh increments as your energy needs grow.

Compare This Kit

Looking for a Different Platform?

EG4 6000XP Off-Grid Kits
Portable / Cabin Power Systems

Need More Storage or Power?

Fortress Solo 6.5K + 16kWh Storage Kit
Fortress Solo 6.5K + 21.6kWh Storage Kit
Fortress 12kW Solar + Storage Systems

Frequently Ask Questions

Frequently Asked Questions

Can this system operate completely off-grid?

Yes. The Fortress Solo 6.5K is designed for off-grid applications and can use solar and battery power as the primary energy sources. Proper sizing is important because the solar array and battery bank must be matched to your electrical loads, daily energy use, location, and seasonal solar production.

Can I connect this system to the utility?

Yes. The Solo 6.5K supports grid input and can be used for self-consumption, backup, and other non-export applications. Utility-connected installations must follow the inverter manufacturer’s requirements along with applicable local utility, permitting, and electrical-code requirements.

Does this system work with a generator?

Yes. The Fortress Solo 6.5K supports generator input. A compatible generator can provide additional power and battery charging during extended periods of low solar production or unusually high energy use.

How much battery storage is included?

This configuration includes two Fortress eFlex MAX 5.4kWh batteries for approximately 10.8kWh of nominal battery storage. Two eFlex MAX batteries also meet Fortress Power’s minimum recommended battery quantity for one Solo 6.5K inverter.

Can I add more batteries in the future?

Yes. The eFlex MAX is a modular 48V battery platform, allowing additional storage to be added as your energy needs grow. Battery expansion should follow Fortress Power’s installation, communication, cabling, and system-design requirements.

Can I add more solar panels later?

Potentially. The Solo 6.5K has two MPPT channels and supports up to 10,000W of PV input. Any additional panels must keep the array within the inverter’s PV power, voltage, and current limits, including cold-weather open-circuit voltage calculations.

Can I expand the system with additional inverters?

Yes. Fortress Power supports paralleling up to six Solo 6.5K inverters for systems that need additional output capacity. Battery quantity, busbars, cabling, overcurrent protection, and system configuration must also be increased appropriately when additional inverters are added.

What appliances can this system power?

The Solo 6.5K provides 6,500W of continuous 120/240V split-phase output and up to 13,000VA of peak output. It can support many common household, cabin, workshop, and property loads, but actual performance depends on appliance wattage, starting surge, and which loads are operating at the same time. See the “What Can It Power?” section for typical examples.

How long will the batteries last during a power outage or overnight?

Battery runtime depends on how much electricity you are using. This kit includes approximately 10.8kWh of nominal storage, but actual runtime varies with battery state of charge, load level, inverter losses, temperature, operating settings, and whether solar is producing power at the same time.

Does this system provide both 120V and 240V power?

Yes. The Solo 6.5K provides 120/240V single/split-phase output, allowing it to support standard 120V circuits as well as compatible 240V loads within the inverter’s available output capacity.

What does the included Tigo rapid shutdown system do?

The included Tigo rapid shutdown equipment provides module-level rapid shutdown for the solar array. This allows PV conductors to be reduced to rapid-shutdown voltage levels when the system is activated and helps the array meet rapid-shutdown requirements where applicable.

Does this kit include solar panel racking?

No. Solar racking is site-specific and should be selected separately based on your roof type, ground-mount design, structure, panel layout, wind and snow requirements, and local code requirements.

Does this system include everything I need?

The kit includes the major solar, inverter, battery, PV wiring, connector, and rapid-shutdown components listed in the “What’s Included” section. Additional conduit, wire, breakers, disconnects, grounding equipment, racking, service equipment, and permitting-related components may be required for your specific installation.

Can I monitor the system remotely?

Yes, when the appropriate communications hardware and internet connection are available. The Solo 6.5K uses the SOLARMAN platform for homeowner monitoring and installer commissioning, allowing system operating information to be viewed remotely.

Can I install this system myself?

The kit is assembled around compatible major components to simplify system selection, but installation involves high-voltage DC, battery power, and 120/240V AC electrical work. You are responsible for following manufacturer instructions and complying with applicable electrical codes, permitting, inspection, and utility requirements.

Why should I purchase a turnkey system instead of selecting components individually?

This kit combines a compatible Fortress inverter and battery platform with a matched solar array, PV wiring, connectors, and Tigo rapid shutdown equipment. That reduces the number of major compatibility and sizing decisions required compared with building a system from unrelated individual components.

What if 10.8kWh of battery storage isn’t enough?

The Fortress platform is expandable. If your property needs longer overnight runtime or greater energy reserves, additional eFlex MAX battery capacity can be added, or you can select one of our larger Fortress storage configurations while keeping the same basic Solo 6.5K inverter platform.

Still have questions?

Our solar specialists can help you size the right system, review your energy goals, and determine whether this Fortress configuration is the right fit for your property before you place your order.

Call us at

480-584-4281