- Main generator running hours can be drastically reduced.
- Running 24 hours a day, the auxiliary generator could also supply all hot water needed on board.
12.4. The alternatives for 10kW average consumption compared
Generating 240 kW per day (10 kW average)
40 kW generator with 9 Multi’s and PowerAssist. Service battery of 2000 Ah Aux. genset 8 kW
AC Concept
Generators Output
1x40 kW + 1x 8 kW 1x 4 hr and 1x 20 hr
1x 50 kW + 1x 10 kW 1x 10 hr and 1x 14 hr
Hours per 24-hour period
Consumption per 24-hour period
95 litres 800 kg
120 litres 1200 kg
Weight
Battery Capacity
2000 Ah 2000 kg
400 Ah 400 kg
Weight
Shore power
18 kW
50 kW
Rating
3 x 32 A
3 x 100 A
Weight auto transformer
n/a
Weight 50 kW shore converter
Not needed
1300 kg
DC-AC inverter Output
22.5 kW (9 Multi’s)
6 kW 54 kg
Weight
162 kg
Battery chargers Current
600 A 80 kg
75 A 10 kg
Weight
Total weight
3000 kg
2964 kg
2 weeks fuel consumption (see note)
1330 litres
1680 litres
Total weight incl. fuel for 2 weeks
4017 kg
4375 kg
Note: savings due to usable heat output of the auxiliary genset not included)
What can we learn from the table?
The main lesson is that with 240 kWh of electric energy required per day, the limits of the new components and concepts presented in this book have been reached.
The battery needed to implement PowerAssist and the DC concept becomes really cumbersome and very expensive.
Only when a battery free period is a must, or when the energy needed is, for most of the time, much less than 240 kWh per day, will PowerAssist or the DC concept be attractive options.
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