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Fronius CL 44.4 Delta Inverter

3-Phase Inverter for Commercial Solar Systems
Rated up to 44,400 watt 3-Phase AC output
Input Power (DC)
Fronius Model Number CL 44.4 Delta
Max. DC Power (STC) 52,000 W
Max DC Voltage 600 V
MPPT Voltage Range 230V - 500V
Max. Input Current 205.4 A
Inverter Efficiency 95.9%
CEC Efficiency 208 V: 94.5%
240 V: 95%
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Fronius CL Inverters

Fronius CL 44.4 Delta Commercial Solar Inverter

Fronius Solar

Fronius CL 44.4 Delta Commercial Grid-Tie Inverter

Solar inverter for larger commercial solar systems.

CL 44.4 Delta inverter system
The power stages can be easily installed and removed from the CL 44.4 Delta. There is plenty of space in the generous connection area.

Multiple power stages operate in the Fronius CL 44.4 Delta inverter accomplishing something great together with MIX™ technology. This combination of several power stages has many advantages: maximum earnings in partial load ranges, high system stability, long service life, and easy servicing. This model is selectable between 208V and 240V three-phase AC power.

Solar system design planning and installation is easy.
The Fronius CL 44.4 Delta inverter was designed with practicality in mind. It can be used for many different configurations due to its planning flexibility. It is also easy to set up due to numerous design details that make installation and connection as simple as possible.

Designed for indoor and outdoor installations.
This inverter has a well designed durable NEMA 3R rated weatherproof, powder-coated aluminum enclosure.

Automatic HF Transformer switching
Fronius transformer inverters like the CL 44.4 Delta use a high-frequency (HF) transformer. The automatic transformer switching function in the produces three efficiency peaks. The result: A constant level of efficiency across the entire input voltage range, resulting in higher yields. Other key advantages of HF transformer technology are a compact, lightweight design, and safety as a result of the galvanic isolation.

Wide input voltage range.
Different module configurations are possible: The wide input voltage range ensures high flexibility for system configuration.

Extensive system monitoring
System monitoring is vital for inverters of this size. Using the comprehensive Fronius DATCOM system, you can set up a complete monitoring system including extensive data recording, analysis, visualization as well as remote monitoring.

Fronius CL 44.4 Delta Inverter Features

  • Inverter system design with MIX™ technology
  • Automatic HF transformer switching
  • High-yield power electronics
  • Intelligent cooling
  • Simple system planning and easy installation
  • Comprehensive system monitoring
Delta Grid-tie

Fronius CL 44.4 Delta Central Inverter Review

Unique system design with the Fronius MIX concept. 
Multiple power stages operate in the Fronius CL accomplishing something great together. This combination of several power stages has many advantages:  maximum earnings in partial load ranges, high system stability, long service life and easy servicing. 

These multiple identical power modules divide up the work in the MIX concept. The individual power racks are turned off and on automatically depending on the insolation power. This ensures that the load is optimized and yield is always at maximum – even while raining, when cloudy or at dusk. 

An important advantage of having a Fronius CL inverter involves the exclusive MIX™ (Master Inverter eXchange) concept. An inverter becomes significantly more efficient with a DC loading of 25 or more percent of the nominal rated output. Many inverters only have one power stage, becoming less efficient during low sunlight hours.

Simple planning, easy installation.
The Fronius CL was designed with practicality in mind. It can be used for many different assignments due to its planning flexibility. It is also easy to set up due to numerous design details that make installation and connection as simple as possible. The Fronius CL 44.4 Delta inverter is compatible with all solar panels. What makes this inverter even more appealing is the intuitive operation and ease of use, together with its highly informative analyses of system values in every situation.

Integrated grounding option.
The Fronius CL 44.4 Delta is well-equipped should modules have to be grounded whether positive or negative. Simply change two wires and a software paramater to change from negative to positive grounding.

Intelligent cooling.
An innovative ventilation design eliminates dust and moisture from getting into the power stage area. The air required for cooling is drawn in by two fans on the front of the device and passed through a closed channel through the individual power stages. The electronic components never come into contact with the outside air.  Inside the airtight power stage a smaller fan ensures uniform cooling. This sophisticated system increases the operational reliability and the service life of the inverter.

Read more about Fronius CL Inverters.

Datalogging & Monitoring Options

Monitoring using Signal Card

• Monitoring using Personal Display
• Monitoring with Fronius CL DatCom

Additional components

• Fronius CL Public Display
• RiCo Display with Public Display Card
• Sensors with Sensor Card

Combination of components

• Public Display + Sensor Box
• Public Display + Sensor Box + FRONIUS SolarWeb + Fronius CL.message
• String Control (ideal for Fronius CL central inverters)
• String Control + Basis DatCom

info Fronius Datamanager Datasheet

Fronius configuration tool
The Fronius configuration tool is safe, easy and just requires a common Internet browser.

Fronius Configuration Tool

Comprehensive & User Friendly - For the perfect sizing of your PV system.
In the planning stage of a PV system, the Fronius Configuration Tool supports you in the best possible way to get the perfect sizing. Just complete the input fields and you will quickly get charts of the different configuration possibilities. Solar Electric Supply has been designing solar inverter systems for over 15 years. Contact our knowledgeable staff with any other questions you may have about solar system design.

System Requirement for using Fronius Configuration Tool
Internet browser: Firefox, Chrome or Microsoft Internet Explorer 6.0 equivalent or newer.
Download configuration tool

Disclaimer:  The Fronius Configuration Tool was developed by Fronius to assist Users with system designs but does not guarantee the configuration is appropriate for your use. By using the Fronius Configuration Tool, the User claims all responsibility for the accuracy and validity of the results including, but not limited to, system design, performance, and code compliance. It is incumbent upon the User to verify that the system design will meet their site-specific needs and local codes. 

Contact us toll-free at (877) 297 0014 for expert assistance with any commercial Fronius CL 44.4 Delta inverter system design.