Fortress Power Solo 6.5kW Single/Split-Phase Off-Grid Inverter
🔋☀️ Affordable off-grid power you can depend on
The Fortress Power Solo 6.5K delivers 6.5kW of reliable power for off-grid homes, cabins, and backup systems. Its built-in 140A solar charge controller and support for both grid and generator input ensure smooth, uninterrupted operation. Time-of-use scheduling helps you store and use energy efficiently to lower utility costs.
Easily scale up to 39kW by connecting multiple units, and optional CTs provide enhanced safety and precise energy management. Ideal for off-grid living, microgrids, or adding resilience to your home.
Applications
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Off-grid homes and cabins
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Home backup power
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DIY solar setups
Introduction to the Fortress Power Solo 6.5K Inverter Reliable Hybrid Power for Off-Grid & Backup Solutions
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Fortress Power Solo 6.5K Inverter Key Benefits
Reliable, Flexible Power for Off-Grid & Backup Applications
🔋 High-Capacity Solar Charging
Charge faster and more efficiently with the built-in 140A solar controller, making it
easy to get maximum energy from your solar panels.
⚡ Reliable Power Management
Automatically switch between grid and generator input to keep your home or cabin running smoothly during outages or low solar production.
🕜 Time-of-Use Optimization
Optimize when you store and use energy with time-of-use scheduling to reduce utility
costs and make the most of your solar setup.
🛡️ Safe & Precise Operation
Optional current transformers (CTs) provide extra safety and precise energy control, giving you confidence in your system’s stability.
↗️ Scalable Up to 39kW for Growing Needs
Connect up to six Solo 6.5K units for a total of 39kW, so your system can expand as your energy demands increase.
🏡 Versatile Application Support
Ideal for off-grid living, backup power, smart load management, or microgrid
installations, delivering reliable, flexible energy wherever you need it.
Solo 6.5K Feature Videos
See what Solo 6.5K can do. Coming Soon~
Solo 6.5K Installations Videos
Step-by-step setup guide. Coming Soon~
Solo 6.5K Influencer Videos
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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 |
