11.4. Conclusion
The alternatives for 48 kWh per day compared:
Generating 48 kWh per day (2 kW average)
10 kW AC generator with PowerAssist , plus an aux. genset
20 kW AC generator with PowerControl plus an aux. genset
20 kW AC generator with generator free period
Aux. genset, 5kW Hours per 24-hour period 12
12
n/a n/a
Consumption per 24-hour period
8 litres
8 litres
Weight
150 kg
150 kg
n/a
Main generator Hours per 24-hour period 6 Consumption per 24-hour period
6
8
15 litres
20 litres
30 litres
Weight
300 kg
450 kg
450 kg
Battery Capacity
24 V 1000 Ah
24 V 1000 Ah
24 V 2000 Ah
Weight
1000 kg
1000 kg
2000 kg
Shore power
3,5 kW
3,5 kW
15 kW
Rating (in Europe) Auto transformer 110 – 230 V
16 A 1-phase
16 A 1-phase
32 A 3-phase
Not needed if battery chargers with universal 90-265 VAC input are used
Not needed if battery chargers with universal 90- 265 VAC input are used
n/a
Weight 15 kW shore converter
Not needed
Not needed
545 kg
Chargers / Inverters Battery chargers
100 A 12 kg 12.5 kW (5 x MultiPlus)
100 A 12 kg
200 A 24 kg
Inverters
10 kW (4 x Multi)
2.5 kW
Weight
90 kg
72 kg
18 kg
Total weight of the installation
1552 kg
1684 kg
3037 kg
Note: savings due to usable heat output of the aux. genset not included)
What can we learn from the table?
11.4.1. The 20 kW generator with generator free period (right-hand column)
This alternative is heavy, and the 2000 Ah battery is expensive, with the risk of high expenses in case of a mistake regarding battery management or an accident, like a cell failure for example.
The alternative, operating the generator 24 h per day is also not very attractive. A second generator of for example 6 kW could be used to cover most of the day, running with an average load of 1.5 kW, with the 20 kW generator coming in when more power is required.
The shore converter is the other expensive and heavy component in this configuration.
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