10.6.7. Efficiency of a diesel powered generator The efficiency of a diesel powered generator exceeds 30 % at full load. The efficiency drops as the % load reduces. On a boat a genset will run at low load most of the time. Typically the average efficiency will be 10 to 20 %. The efficiency can be substantially improved with PowerControl or PowerAssist (see sect. 8.3.3 and 8.4.).
10.6.8. The energy supply on a motor yacht of 9 to 15 metres or a yacht at anchor.
Even with the complete wish list of section 10.5 installed, the alternators on the main engines of a motor yacht can easily supply the average consumption of 24 A at 24 V DC when cruising. In other words, if one expects to motor for several hours nearly every day or to have shore power available every night, 14 kWh of daily energy consumption can be taken care of without installing a separate generator.
At anchor consumption will reduce to approx. 22 A, because navigation equipment is switched off. When at anchor for longer periods a generator will be needed, as discussed in sect. 10.6.3 to 10.6.6.
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