Cooling Technology:

Isotherm Smart Energy Control


With Isotherm Smart Energy Control, Indel Webasto Marine offers the very unique opportunity to dramatically reduce on board power consumption for refrigeration appliances. This kit can be easily retrofitted to upgrade the energy saving capabilities of your existing Isotherm refrigeration product.

Important Note:  The Isotherm Smart Energy Control (ISEC) only fits the Danfoss/SeCOP DC-Only module.  The new CRUISE Elegance line provides a pre-formed location in the cabinet for installing the ISEC temperature probe.  Please see the videos below for tutorials on installation of the ISEC and other Elegance features.


How does it work ?

The sophisticated, processor-based Isotherm Smart Energy Control technology achieves significant power consumption savings by continuously scanning a set of key environmental factors to determine, through advanced proprietary algorithms, what is the most relevant compressor speed to maximize the performance/battery drain ratio (COP).


The device not only makes your fridge intelligent but also allows the storage of a significant amount of cold energy into the loaded food and drinks. Isotherm Smart Energy Control reduces the cabinet temperature more than a traditional fridge without freezing the food. This is continuously monitored by an air sensor in the cabinet. The cooling energy is stored when a power surplus is available (engine on or connection to grid) and reused first, before the fridge is running on battery.

The result:
Up to 35 % savings due to a more efficient use of the compressor and up to 50 % savings with combined effects of stored cooling energy in food and drinks.

Following is the part number and description:

SED00033AA Isotherm Smart Energy Control Kit 

Isotherm Advantages and the Isotherm Smart Energy Control

The Elegance line of refrigerators was designed in conjunction with the Isotherm Smart Energy Control (ISEC) to reduce battery power consumption.  In addition to features such as doors with thicker insulation and a more efficient freezer design, the Elegance line has pre-formed locations within the fridge for the installation of the ISEC.  These pre-formed locations help the installer determine where to install the temperature sensors and where to drill for the pass-through of the control wiring.  The light/thermostat assembly also is pre-configured for easy change of the mechanical thermostat to the ISEC potentiometer within the light/thermostat housing. 

Here are some videos that describe how the ISEC operates and show how it is installed.

ISEC Overview

Promo Video

Installation Video

All Isotherm fridges are low-power consumption by design with superior insulation, better door seals, and better construction materials than the typical refrigerator.  Because of better materials and design, Isotherm can run the compressor at slow speed which consumes the least battery power (all Danfoss/SeCOP compressors can run at three speeds).  Others run compressors at high speed to compensate for economy construction and freezer designs that have plastic walls that disguise frosting issues but also reduce cooling efficiency and consume valuable storage space in small fridges. 

The ISEC can save up to 30 to 50% more battery power under typical cruising conditions where the vessel or vehicle has a period of time when surplus power is being produced such as when an engine is running and the alternator is charging the batteries or when a solar panel is producing surplus power. During charging periods, the battery is receiving 13+ volts which is detected by the controller.   At these times, the ISEC runs the compressor at high speed and reduces the temperature within the fridge.  These colder temperatures are absorbed by food and beverages which act like a cold sink and reduces the compressor run time when just running on battery alone.  On battery alone (12.5 volts typically), the ISEC runs the compressor at slow speed and allows the temperatures to return to normal fridge temperatures. Because food and beverages are at a colder temperature, these serve to reduce compressor run time which reduces battery consumption.  

The ISEC is a bonus value if you expect conditions where there will be surplus power.  If not, Isotherm fridges as they come from the factory are very efficient and will save the time and money for installing the ISEC.


Service & Downloads


Indel Webasto Marine USA Inc,

3400 Gateway Drive, Unit # 107

Pompano Beach, FL - 33069 USA