10.7. Conclusion.
The following table summarises the alternatives that have been discussed.
Generating up to 14 kWh per day (600 W average)
5 kW DC generator 6 kW AC generator with PowerAssist
12 kW AC generator
DC generator Hours per 24-hour period Consumption per 24-hours
3 to 8 7 litres 150 kg
Weight
AC generator Hours per 24-hour period
3 to 8 9 litres 67 dBA 250 kg
4 to 8
Consumption
11 litres 69 dBA 350 kg
Noise
Weight
Battery Capacity
24 V / 800 Ah
24 V / 800 Ah
24 V / 800 Ah
Weight
700 kg
700 kg
700 kg
Shore power Rating
6 A
6 A (DC concept)
3-phase 8 kW 50 A 8 kg
Battery chargers
50 A 8 kg
50 A 8 kg
50 / 60 Hz shore power conversion Yes, no separate shore converter needed
Yes, no separate shore converter needed
No, additional shore converter needed
DC-AC inverters Output
7.5 kW (3 x Phoenix Inverter 2.5 kW)
7.5 kW (3 x MultiPlus) 2.5 kW Multi
Weight
54 kg
54 kg
18 kg
Total weight of installation
962 kg
1012 kg
1076 kg
2 weeks fuel
98 litres
126 litres
154 litres
Total weight incl. 2 weeks fuel
990 kg
1118 kg
1205 kg
What can we learn from the table?
10.7.1. Let us first have a look at the conventional solution: the 12 kW generator:
This solution is heavy and takes a lot of valuable space. With PowerControl , whereby charge current is automatically reduced whenever otherwise an overload would occur, a smaller generator, for example 9 kW, would be sufficient.
The average load of a 12 kW generator would be: -if 4 running hours per day: 14 / (4 x 12) = 29 % -if 6 running hours per day: 14 / (6 x 12) = 19 % And in the case of a 9 kW generator: -if 4 running hours per day: 14 / (4 x 9) = 39 % -if 6 running hours per day: 14 / (6 x 9) = 26 %
Shore power requirement will be in the order of 8 kW, unless for shore power the DC or the hybrid concept is implemented, then a 6 A (= 1,38 kW) outlet would be sufficient.
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