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Fortress Power Solo 6.5kW Single/Split-Phase Off-Grid Inverter

$1,699.00
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The Fortress Power Solo 6.5K is a powerful and flexible 6.5kW split/single-phase hybrid inverter designed for off-grid living, backup power, and grid-tied solar systems. Featuring a built-in 140A solar charge controller and support for both grid and generator input, the Solo 6.5K Inverter ensures seamless power management and reliable operation in any energy scenario. Its intelligent switching system provides uninterrupted power, while time-of-use scheduling helps homeowners lower utility bills by optimizing when energy is stored and used.

Perfect for residential applications, the Solo 6.5K Inverter supports parallel installation of up to six units—delivering up to 39kW of output power. Optional current transformers (CTs) enhance safety and precision by monitoring current flow and improving system stability. Whether you’re powering a remote cabin, designing a smart microgrid, or adding resilience to your grid-connected home, the Solo 6.5K Inverter delivers clean, stable energy when and where you need it.

Applications

  • Off-grid homes and cabins
  • Home backup power
  • DIY solar setups

Fortress Power Solo 6.5K Inverter Features

Reliable, Flexible Power for Off-Grid & Backup Applications

🔋 High-Capacity Solar Charging

The built-in solar charge controller supports up to 140A, maximizing solar input for faster, more efficient battery charging — ideal for large off-grid systems or high-usage households.
2️⃣ Dual Power Source Compatibility

Supports grid and generator input with intelligent switching, giving you seamless power management and uninterrupted operation during outages or low solar production.
🕜 Time-of-Use Optimization

Advanced time-sharing functionality allows users to schedule charge and discharge cycles, optimizing energy usage and reducing reliance on expensive utility rates.
🛡️ Safe & Stable Operation with Optional CT

Optional current transformers (CTs) enhance system safety and reliability by monitoring current flow and enabling precise load control and protection.
↗️ Scalable Up to 39kW

Parallel up to six units for a total output of 39kW, making it a powerful choice for large homes, small businesses, and off-grid compounds.
✅ Versatile Application Support

Designed for a range of energy scenarios including Backup Power, Off-Grid Living, Peak Shaving, Net Metering, Smart Load Control, and Microgrid Installations—all in one rugged and intelligent package.

Fortress Power Solo 6.5K Inverter Technical Specs & Downloads

Get the details you need—spec sheets, manuals, and performance data all in one place. We link directly to the manufacturer's site, so you know you always have the most up-to-date information.

GENERAL DATA
Weight 47.84 lbs (21.7 kg)
Operating Temperature 14 ºF - 131 ºF (-10 ºC - 55 ºC), >45 ºC derating
Protection Level IP20 (for indoor use only)
Noise <60db
Dimensions (H x W x D) 27 x 16.1 x 5.5 in (686 x 410 x 140 mm)
Cooling Mode Fan
INVERTER OUTPUT
Rated Output Power 6,500W
Maximum Peak Power 13,000 VA
Rated Output Voltage 120/240 VAC (Single/Split-Phase)*
Rated Frrequency 50/60Hz*
Output Wave Pure Sine Wave
Switching Time 10 ms (typical value)
Parallel Number 6
BATTERY PARAMETERS
Compatible Battery Type Lithium-ion battery / lead-acid battery / user- defined battery*
Rated Battery Voltage 48 Vdc
Voltage Range 40 Vdc-60 Vdc*
Maximum Grid/Generator Charge Power TBD
Maximum Battery Charge Power (with PV) 140 A DC*
PV INPUT
MPPT Channel Number 2
Maximum Input Power 5,000W+5,000W
Maximum Input Short Circuit Current 18 / 18 A
Maximum Open Circuit Voltage 550 Vdc / 550Vdc
MPPT Operating Voltage Range 150 Vdc-450 Vdc
GRID / GENERATOR INPUT
Input Phase Voltage Range 65 VAC - 140 VAC
Grid Frequency Range 50/60 Hz
Bypass Overload Current 40A
COMMUNICATION
Built-in Interface RS485 / CAN / USB / dry contact*
External Module (Optional) Wi-Fi / GPRS*
EFFICIENCY
MPPT Tracking Efficiency 99.9%
Maximum Efficiency of Battery Inverter 93%
STANDARDS & CERTIFICATIONS
Safety Standards IEC62109-1, IEC62109-2, and UL1741
EMC EN61000-6-1, EN61000-6-3, and FCC 15 class B
RoHS Yes

Solo 6.5K Inverter Data Sheet

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