OutBack FLEXmax MPPT Solar Charge Controller High-Efficiency, Intelligent Solar Charge Controller for Off-Grid and Grid-Tied Battery Based Systems

The OutBack FLEXmax Charge Controller series is an industry-leading line of Maximum Power Point Tracking (MPPT) solar charge controllers designed for high-performance solar energy systems. Known for their reliability, intelligent charging algorithms, and unmatched flexibility, these controllers are ideal for residential, commercial, and off-grid applications. FLEXmax controllers ensure your solar system operates at peak efficiency by continuously tracking the maximum power point of your photovoltaic array.

Available in two models—FLEXmax 60 and FLEXmax 80—they are engineered to handle demanding solar configurations while maximizing battery life and performance.

Key Features and Benefits

Advanced MPPT Technology for Maximum Energy Harvest

• Utilizes Maximum Power Point Tracking (MPPT) technology to extract the highest possible power from your solar panels.
• Improves energy yield by up to 30% more compared to traditional PWM charge controllers.
• Continuously adjusts to changing sunlight and temperature conditions to optimize energy flow.
  

High Power Capacity

Available in two models:

• FLEXmax 60 – Supports up to 60 Amps of continuous DC output.
• FLEXmax 80 – Supports up to 80 Amps, suitable for large-scale solar systems.
• Can be used with solar arrays up to 150VDC input (max open circuit voltage).
• Compatible with 12V, 24V, 36V, 48V, and 60V battery banks.

Intelligent Battery Charging

• Features four-stage intelligent charging algorithm (Bulk, Absorb, Float, and Equalize) for optimal battery performance.
• Customizable settings for various battery types including:
• Flooded lead-acid
• AGM (Absorbed Glass Mat)
• Gel batteries
• Lithium-ion (LFP, NMC, etc.)
• Helps extend battery life and ensures full charging without overcharging.

Active Cooling for Continuous Full-Output Operation

• Equipped with an internal active cooling fan, allowing for full-rated output current even in high-temperature environments.
• Ideal for installations in warm climates or enclosed power rooms.
• Reduces derating and enhances performance consistency over time.

Integrated Display and Programming Interface

• Built-in backlit 80-character display provides real-time system status and detailed performance metrics.
• Tracks daily, weekly, and lifetime data including kWh production, max voltage, and amp output.
• On-board programming allows easy customization of charging profiles and system parameters.

Data Logging and Remote Monitoring Ready

• Stores up to 128 days of operational data for performance analysis.
• Compatible with OutBack’s MATE3s system display and OpticsRE remote monitoring portal.
• Enables remote configuration, diagnostics, and performance tracking via web or mobile access.

Seamless System Integration

• Integrates easily with other OutBack Power components such as:
  
  
• FXR/VFXR inverters
• Radian Series inverter/chargers
• Battery monitoring kits
  
  
• Enables centralized control of your solar + storage system through a single interface.
  Highly Programmable

• Fully customizable charging parameters, auxiliary outputs, and alarms.
• Supports load control and generator start functions through programmable AUX port.
• Ideal for advanced system designs, microgrids, and hybrid applications.

Built for Rugged Environments

• Constructed using industrial-grade electronics and components.
• Conformal coated circuit boards for added protection in dusty, humid, or corrosive environments.
• UL-certified and designed to perform in off-grid and mission-critical settings.
  

Flexible Mounting and Installation

• Wall-mountable design fits easily into power rooms, closets, and electrical enclosures.
• Can be installed indoors in residential or industrial settings.
• Compatible with OutBack’s FLEXware mounting solutions for clean, organized installations.

Common Applications

The FLEXmax Charge Controller is a versatile and trusted solution across a wide variety of solar energy systems:

Residential Solar Systems

• For homeowners seeking battery backup, energy independence, or off-grid living.
• Ideal for cabins, farms, and homes in remote areas with limited grid access.

Commercial and Industrial Sites

• Supports energy storage systems in warehouses, small commercial buildings, or agriculture.
• Used in conjunction with larger inverter systems for demand charge reduction and time-of-use optimization.

Off-Grid and Remote Installations

• Essential in remote telecommunications towers, rural electrification projects, and disaster relief.
• Provides reliable charging for mission-critical off-grid systems.

Hybrid and Microgrid Applications

• Fully programmable for custom power distribution and generator management.
• Used in solar + diesel generator + battery combinations for community power, military bases, or island systems.

Advantages Over Other Charge Controllers

• High Voltage Support: Accepts PV input up to 150VDC for reduced wire size and installation costs.
• Advanced MPPT Algorithms: Real-time tracking ensures consistent solar performance across seasons.
• High Output in Harsh Conditions: Active cooling allows full performance even in hot environments.
• System-Wide Integration: Works seamlessly with OutBack inverters and accessories.
• Proven Reliability: Thousands of systems installed globally with a strong record of uptime and durability.
• Remote Monitoring Capability: Optional integration with OutBack’s OPTICS RE platform allows users to track performance, troubleshoot issues, and adjust settings remotely.

Why Choose the OutBack FLEXmax MPPT Charge Controller?

The OutBack FLEXmax series is a premium-grade MPPT controller trusted by solar professionals worldwide. Built for performance and durability, it excels in every category:

• Smart, adaptive battery charging
• Proven MPPT performance and system efficiency
• Rugged hardware suitable for tough climates
• Backed by OutBack Power’s industry reputation for reliability and long-term support
  

Whether you’re designing a simple off-grid system or a complex energy management solution, FLEXmax charge controllers give you the power, flexibility, and control to build a system that lasts.