![]() Hermetic units, like their mechanical drive cousins, have pros and cons. Using an external, solid-state controller and three-phase pulse technology to propel the motor, the Danfoss unit has improved efficiency and reliability. What differentiates the Danfoss is that it eliminates the inefficient brush-and-commutator design of conventional DC motors. It was introduced in 1926 by General Electric, and the AC version had dominated household refrigeration for many decades. The hermetically sealed electric compressor wasnt a new concept. The German-engineered Danfoss compressor was not only reliable, it was truly the wave of the future, as advances in battery capacity and charging systems favored 12-volt systems. It didnt take long for Adlers system to attract converts. Going against the prevailing trend of systems with high-capacity mechanical, engine-driven compressors, Adler staked his reputation on the compact Danfoss brushless 12-volt DC electric compressor. The modern marine refrigeration system can be traced back to ice-cube guru Mike Adler, a cruising sailor who applied his engineering talents to a cause that any modern sailor can appreciate-developing a compact, efficient, and reliable alternative to ice. ![]() ![]() The result is an easy-to-install fridge for modest-sized sailboats with well-insulated ice boxes, and an easily expandable system (compressors can be piggy-backed) to suit larger boats. The evolution of the units DC controller eliminates the need for a conventional commutator and brush assembly, and two decades worth of improvements have significantly increased the systems efficiency. All three manufacturers use Danfoss hermetically sealed compressors, devices that have been engineered to house a miniaturized drive motor and compressor inside a grapefruit-size air-tight tank. ![]()
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