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Fortress Power Solo 6.5kW Inverter

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Solo 6.5

$1,689.00
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Fortress Power Solo 6.5K Inverter | 6.5kW Output | 140A Solar Input | Scalable to 39kW

Smart Power Control. Seamless Backup. Total Energy Flexibility.

The Fortress Power Solo 6.5K Inverter delivers clean, stable energy with intelligent power management for modern solar and storage systems. With 6.5kW of split or single-phase output, a built-in 140A MPPT solar charge controller, and support for both grid and generator inputs, the Solo 6.5K ensures reliable power whether you're operating on-grid, off-grid, or in backup mode.

Designed for flexibility and scalability, the Solo 6.5K integrates easily into residential energy storage systems, off-grid homes, and microgrid installations—providing efficient solar utilization and dependable backup power when you need it most.

Key Features

  • Powerful Hybrid Output:
    • 6.5kW continuous power output
    • Supports split-phase and single-phase configurations
    • Capable of powering household loads and heavy appliances
  • High-Capacity Solar Charging:
    • Integrated MPPT solar charge controller
    • Supports up to 140A solar input
    • Maximizes solar production and charging efficiency
  • Dual Input Flexibility:
    • Accepts both grid power and generator input
    • Automatically switches power sources when needed
    • Ensures uninterrupted energy supply during outages
  • Time-of-Use Optimization:
    • Schedule charging and discharging times
    • Store power when rates are low
    • Discharge during peak pricing to reduce electricity costs
  • Optional Current Transformer Monitoring:
    • Add optional CT sensors for advanced monitoring
    • Real-time current flow measurement
    • Improved load control and system stability
  • Scalable System Expansion:
    • Parallel up to six Solo 6.5K units
    • Total system capacity up to 39kW
    • Ideal for large homes, remote sites, and expandable microgrids

Applications

  • Off-grid homes and cabins
  • Backup power systems
  • Smart load management systems
  • Microgrid and solar-plus-storage installations

What’s Included

  • 1 × Fortress Power Solo 6.5K Hybrid Inverter
  • Mounting Kit
  • User Manual
  • Warranty Card

CTs (Current Transformers) sold separately for advanced monitoring and system control.

Specification Sheets:

Fortress Power Solo 6.5kW Inverter Specifications (PDF)

Manuals:

Fortress Power Solo 6.5kW Inverter Installation Guide & Owner Manual (PDF)

Specifications

Parameter Details
Weight47.84 lbs (21.7 kg)
Operating Temperature14°F – 131°F (-10°C – 55°C), >45°C derating
Protection LevelIP20 (for indoor use only)
Noise<60 dB
Dimensions (H × W × D)27 × 16.1 × 5.5 in (686 × 410 × 140 mm)
Cooling ModeFan
Rated Output Power6,500W
Maximum Peak Power13,000 VA
Rated Output Voltage120 / 240 VAC (Single / Split-Phase)
Rated Frequency50 / 60 Hz
Output WavePure Sine Wave
Switching Time10 ms (typical)
Parallel NumberUp to 6 units
Compatible Battery TypeLithium-ion battery / lead-acid battery / user-defined battery
Rated Battery Voltage48 Vdc
Battery Voltage Range40 – 60 Vdc
Maximum Grid / Generator Charge PowerTBD
Maximum Battery Charge Power (with PV)140 A DC
MPPT Channel Number2
Maximum Input Power5,000W + 5,000W
Maximum Input Short Circuit Current18A / 18A
Maximum Open Circuit Voltage550 Vdc / 550 Vdc
MPPT Operating Voltage Range150 – 450 Vdc
Input Phase Voltage Range65 – 140 VAC
Grid Frequency Range50 / 60 Hz
Bypass Overload Current40A
Built-in InterfaceRS485 / CAN / USB / Dry Contact
External Module (Optional)Wi-Fi / GPRS
MPPT Tracking Efficiency99.9%
Maximum Efficiency of Battery Inverter93%
Safety StandardsIEC62109-1, IEC62109-2, UL1741
EMCEN61000-6-1, EN61000-6-3, FCC Part 15 Class B
RoHSYes

Understanding Your Power Needs

Power Calculation Guide

Sizing Metric Formula & Example
Energy Consumption (Wh) Formula: Watts × Hours
Example: 60W × 4 hrs = 240 Wh
Battery Capacity (Ah) Formula: Watt-hours ÷ System Voltage (V)
Example: 240 Wh ÷ 12V = 20 Ah
Inverter Size (W) Formula: Total Watts × 1.25 (safety margin)
Example: 300W × 1.25 = 375W → Use 400W inverter
Total Load Power (W) Formula: Sum of all appliance watts used simultaneously
Example: Light (10W) + Fan (75W) = 85W
Runtime (hrs) of Battery Formula: (Battery Ah × Voltage) ÷ Total Load (W)
Example: (100Ah × 12V) ÷ 240W = 5 hrs

Find Your Power Match

Need / Application System Recommendation
Basic lighting + phone charging Recommended Battery: 50Ah – 100Ah (12V)
Inverter Size: 100W – 200W
Notes: For small backup setups
Home office (laptop, fan, TV) Recommended Battery: 150Ah – 200Ah (12V or 24V)
Inverter Size: 500W – 1000W
Notes: For moderate usage with 4–6 hours of backup
Home backup (fridge, lights) Recommended Battery: 200Ah+ (24V or 48V recommended)
Inverter Size: 1000W – 1500W
Notes: Ideal for longer backups or heavier loads
Business / shop power backup Recommended Battery: 300Ah+ (48V system)
Inverter Size: 2000W – 3000W
Notes: Suitable for commercial setups or extended power outages

Why Shop With Us

  • Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products backed by full manufacturer warranties.
  • Fast, Reliable Shipping: Shipped from U.S. warehouses with quick, dependable freight options — keeping your project on track.
  • 30-Day Hassle-Free Returns: Changed your mind? Enjoy a simple 30-day return process for peace of mind.
  • Real Human Support, 7 Days a Week: Reach us by phone, email, or live chat — no bots, no overseas call centers, just experts who know off-grid power systems.
  • Expert Energy Guidance: Our solar and backup energy specialists are here to help with system design, product questions, and installation tips.
  • USA-Based Service: Local, knowledgeable, and friendly support right here in the U.S.
  • Secure Payments: Shop confidently with encrypted, secure checkout protecting your personal and payment information.
  • Built for Energy Independence: Whether powering a cabin, prepping for emergencies, or going off-grid, our products are chosen for performance, reliability, and sustainability.

Fortress Power Solo 6.5kW Inverter

$1,689.00