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Get started with off-grid energy at a cost-effective level. This bundle includes the reliable Solo 6.5kW off-grid inverter paired with two eFlex MAX 5.4kWh lithium batteries (total 10.8kWh) to form a compact, efficient solar + storage setup.
The Solo inverter features a built-in 140A MPPT solar charge controller, supports generator input, and intelligently switches between power sources to keep your system stable. Meanwhile, the eFlex MAX batteries deliver over 8,000 life cycles, >98% efficiency, and integrated busbars for easy wiring. Everything is engineered to be DIY-friendly, stable, and performance-driven for off-grid homes, cabins, or backup systems.
Applications
Introduction to the Fortress Power Solo 6.5K Inverter
Introduction to the Fortress Power eFlex Max 5.4kWh Battery
Why Choose This Bundle?
🔋 Reliable Energy, Day and Night
The eFlex MAX lithium battery provides 5.4kWh of usable capacity per unit, expandable up to 10.8kWh in this kit. Paired with the SOLO 6.5kW inverter, you’ll have consistent power delivery day and night — even during grid outages.
⚡ All-in-One Power Management
The SOLO inverter intelligently manages solar, battery, and generator inputs to maximize efficiency and uptime. It automatically switches between sources for an uninterrupted power experience.
💡 High Efficiency & Long Lifespan
Engineered with advanced LFP cells and a pure sine wave inverter, this system offers over 98% conversion efficiency and 8,000+ cycles at 80% DoD — ensuring clean, reliable power for over 10 years.
🛠️ Simplified DIY Installation
Both components are designed for plug-and-play setup. The SOLO’s integrated AC/DC breakers and smart monitoring interface make wiring safe and simple, while the eFlex MAX wall-mount design saves space and installation time.
🌍 Off-Grid Independence at a Lower Total Cost
Save more with a system that includes everything you need for off-grid power — inverter, batteries, communication cables, busbars and breakers — all pre-matched and ready to install.
💵 Free Shipping & Long-Term Value
Every bundle includes free shipping, a 10-year warranty, and access to expert support — ensuring a worry-free, cost-effective investment in your energy future.
Solo 6.5kW & eFlex Max Installation Videos
Step-by-step setup guide. Coming Soon~
Solo 6.5kW & eFlex Max Influencer Videos
Hear what influencers think. Coming Soon~
Solo 6.5kW & eFlex Max 5.4kWh 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 |
General | |
Name | eFlex MAX 5.4 |
Total Energy(kWh) | 5.4 |
Max. Charge Current (Continuous) [A] | 100 |
Max. Discharge Current (Continuous) [A] | 100 |
Nominal Capacity [Ah] | 105 |
Voltage Range [V] | 48-55 |
Charging Temperature [F] | 32 ~ 114 |
Discharging Temperature [F] | -4 ~ 131 |
Storage Temperature [F] | 20 ~ 95 |
Dimension [L x W x H, inch] | 17.5 x 24.2 x 7.2 |
Weight [lbs] | 108 |
Life Cycles | 8000 @ 80% DoD |
Round Trip Efficiency | >98% |