Proven reliability.
The Fronius solar technology, the MIX™ Concept with the Fronius Module Manager, creates a compartmentalized system by integrating several smaller power stages. If one power stage should fail, all others operate normally and loss is mitigated due to strict isolation of the problem. In comparison: when the power stage fails in PV systems with a single stage inverter, the entire system stops operating and this leads to considerable loss of earnings. The Fronius MIX™ concept ensures that the inverter remains in operation even when there is a defect in a power stages and this helps to lock in your earnings.

Simple planning, easy installation.
The Fronius CL 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.

Long service life.
The control unit automatically calculates which power stages and how many will be turned on and off in partial load operation based upon the respective operating hours of the power stages. This helps to equalize the work load on the electronics. This also decreases the operating hours of the individual power stages thus increasing the service life of the inverter.

Fast service option.
When service is required, power stages can be easily removed and replaced via the plug & play principle and drawer design. This ensures the highest serviceability and the fastest reaction times on the market.

Generous connection area.
Sufficient space is available for connections and cabling with large cable cross sections, making installation much easier.

High-yield power electronics.
The Fronius CL was designed for continual high performance. The clever combination of automatic transformer switching, the precise Fronius Module Manager, the innovative ventilation concept and the advantages of the high frequency transformer technology make it one of the highest yield inverters of its class.

Installation made easy: The power stages can be easily removed from the PowerRack for transport. Cables with large cross sections can be easily connected in the spacious connection area.

High performance power stages with uniform high efficiency using automatic transformer switching, precise MPP tracking and an intelligent cooling concept.

Automatic transformer switching.
Fronius transformer inverters use a high-frequency (HF) transformer. The Fronius CL provides constant, high efficiency over the entire input voltage range. This is because Fronius inverters have three efficiency peaks due to automatic transformer switching. The result: A constant level of efficiency across the entire input voltage range, resulting in higher yields. In comparison: Devices without transformer switching only have one efficiency peak. The efficiency then decreases steadily with an increasing input voltage. Other key advantages of HF transformer technology are a compact, lightweight design, and safety as a result of the galvanic isolation.

Exact MPP tracking.
The Fronius Module Manager always finds the exact maximum power point (MPP). This is true even with the more demanding thin film modules. Overall, the Fronius Module Manager is able to achieve an outstanding MPP adaptation efficiency of 99.9 %. This ensures that the maximum yield is obtained from every ray of light.

High-frequency transformer technology.
High performance with low weight and a compact design: The use of proven high-frequency transformer technology produces excellent performance results. The Fronius CL uses galvanic isolation, which meets the strictest safety standards worldwide.

Unique system design with the Fronius MIX™ concept
Up to 15 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. Higher partial load efficiency. 9, 12 or 15 identical power stages divide up the work in the MIX™ concept. The individual power stages are turned off and on automatically depending on the irradiance. This ensures that the load is optimized and yield is always at maximum – even while raining, when cloudy, or at dusk.

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.

Wide input voltage range.
Different module configurations are possible: The wide input voltage range ensures high flexibility for system configuration. Integrated grounding option. The Fronius CL is compatible with either positive or negative grounded modules. Simply change two wires and a software parameter to change from negative to positive grounding. Optional exhaust air guide. If the Fronius CL is set up in a closed area, the exhaust air can be channeled out of the space using a connected pipe to prevent extreme heating of the ambient air. An integrated relay contact can also be used to control an external fan that draws the air to the outside.

Low installation height.
The Fronius CL can also fit into confined spaces due to its low 72 inch height (with base). This compact design is achieved by its three-column arrangement of power stages in the inverter.
The power stages can simply be removed for installation. This reduces the weight of the Fronius CL and makes the housing easier to move. The power stages can then be re-inserted and the inverter can begin operation immediately.

Optional exhaust air guide.
If the Fronius CL is set up in a closed area, the exhaust air can be channeled out of the space using a connected pipe to prevent extreme heating of the ambient air. An integrated relay contact can also be used to control an external fan that draws the air to the outside.