The Isara Yachts parallel hybrid differs from some other hybrid (often serial hybrids) because it maintains the mechanical connection between the engine and propeller shaft. As it's name implies the electric motor acts on the same drive shaft in parallel with the engine. The Power split is a mechanical device that allows transfer of power between its connections. 
You can drive the propeller directly from the engine or from the electric motor or from both. You can also disconnect the propeller for a stand-alone generator function. During re-generation the engine is disconnected.
There are many reasons users love their hybrid systems and some are more relevant than others depending on the type of sailing you are doing. In brief, decreased fuel consumption, Zero emissions, and silent, vibration free propulsion are some of the headlines.
Most sailors will recognise an early morning or late night start for a passage, often meaning a noisy getaway in the quiet of a sleeping marina. They will also recognise the need to warm the engines for a short time before letting go and also the need for engine checks prior to starting.
With an electric hybrid drive, the skipper simply turns on the electric drive and engages the throttles, no warm up, no noise, no smoke, no vibration, no emissions, sleeping crew are left sleeping, and the motors provide silent and emission free propulsion,
With a reasonable battery bank, several hours of cruising on electric drive only is achievable, and this is without taking into account any extra charge from solar, wind, or the propellers rotating in the water when sailing, however when the charge drops to the preset reserve level, the engines cut in automatically to power the boat and recharge the battery bank.
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Isara 50 Hybrid
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