Fortress Power Solo 6.5K Inverter | 6.5kW Output | 140A Solar Input | Scalable to 39kW
Smart Power Control. Seamless Backup. Total Energy Flexibility.
Whether you're going off-grid, building a backup power system, or optimizing your solar setup, the Fortress Power Solo 6.5K Inverter delivers clean, stable energy with intelligent control. With 6.5kW of split/single-phase output, a built-in 140A MPPT solar charge controller, and dual input support for both grid and generator power, the Solo 6.5K is designed to meet your energy needs—reliably and efficiently.
Built for flexibility, scalability, and ease of integration, it’s the perfect solution for modern energy systems in off-grid homes, smart microgrids, or grid-tied residences looking to cut costs and gain independence.
Key Features:
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Powerful Hybrid Output: With a robust 6.5kW output and split/single-phase capability, the Solo 6.5K powers everything from essential household loads to heavy appliances—making it ideal for home energy storage, off-grid living, or full-system backup.
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High-Capacity Solar Charging: Built-in MPPT solar charge controller supports up to 140A, maximizing your solar input for faster charging and more efficient use of available sunlight.
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Dual Input Flexibility: Accepts power from both the grid and a generator, automatically switching as needed to ensure uninterrupted operation—perfect for areas with unreliable grid access or prolonged outages.
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Time-of-Use Optimization: Save on utility bills with intelligent time-based scheduling. Automatically store energy when it’s cheap or abundant, and discharge it during peak pricing periods.
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Optional Current Transformers (CTs): Add precision and safety with CT monitoring. These optional sensors allow for real-time current flow measurement, improved load control, and greater system stability.
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Scalable System Design: Need more power? No problem. Connect up to six Solo 6.5K units in parallel for a total output of up to 39kW—ideal for large homes, remote sites, or expandable microgrids.
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Built for Versatility: Whether you’re off-grid, grid-tied, or somewhere in between, the Solo 6.5K is built to handle it all. Use it for:
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Off-grid homes and cabins
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Backup power systems
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Smart load management
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Microgrid and solar-plus-storage installations
What's Included:
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1 × Fortress Power Solo 6.5K Hybrid Inverter
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1 × Mounting Kit
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1 × User Manual
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1 × Warranty Card
CTs (Current Transformers) sold separately for advanced monitoring and control.
Specifications
| 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 Grid |
| 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 |
Shopping Guide
Why Shop With Us
Why Shop With Ecogrid Supply?
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Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products with full manufacturer warranties.
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Fast, Reliable Shipping: All items ship from our U.S. warehouses with quick and dependable freight options to keep your project on track.
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30-Day Hassle-Free Returns: Change your mind? No worries — enjoy a simple 30-day return process for peace of mind.
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Real Human Support, 7 Days a Week: Reach us by phone, email, or live chat — no bots, no overseas call centers, just real people who know off-grid power systems.
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Expert Energy Guidance: Our solar and backup energy specialists are ready to help you with design, planning, product questions, and installation tips.
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USA-Based Service: Our team proudly operates here in the United States, providing local, knowledgeable, and friendly support.
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Secure Payments: Shop confidently with our encrypted, secure checkout to protect your personal and payment information.
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Built for Energy Independence: Whether you’re powering a cabin, prepping for emergencies, or going off-grid, our products are selected for performance, reliability, and sustainable operation.