10.5m Aluminium Boat Propulsion 2xTorqeedo Electric Outboards & Diesel Generator Architecture A Rochian
PROPULSION COMPARATIVE ANALYASYS
1. Outboard Motors (300 hp total)
*Advantages:*
Easy installation and maintenance.
More deck space
*Disadvantages:*
Higher fuel consumption (300 liters per hour on average).
Higher noise and vibration levels.
2. Inboard Diesel Engine (300 hp) with Stern Drive
*Advantages:*
Better fuel efficiency (50-60 liters per hour on average).
Lower noise and vibration levels.
Better stability due to lower center of gravity.
*Disadvantages:*
More complex installation and maintenance.
Takes up internal space.
3. Hybrid System with 2x Torqeedo Outboards (100 kW each) powered by a Diesel Generator
*Advantages:*
High efficiency and lower emissions when operating on electric power.
Reduced noise and vibration.
Flexibility in power sources (diesel generator and electric motors).
*Disadvantages:*
Higher initial cost for the hybrid system.
Requires space for batteries and diesel generator.
More complex system potentially higher maintenance needs.
Fuel Consumption and Generator Sizing for the Hybrid System
*Electric Motors:*
2x Torqeedo Outboards, each 100 kW (total 200 kW).
1 kW is approximately 1.34 hp, so 200 kW is roughly 268 hp.
*Diesel Generator:*
Considering efficiency losses assume around 85-90% efficiency.
Total power needed: 200 kW / 0.85 ≈ 235 kW.
*Diesel Generator Size:*
A generator size of approximately 235 kW would be required to continuously power the electric motors at full load.
Typical fuel consumption for a diesel generator is approximately 0.2-0.25 liters per kW-hour.
For a 235 kW generator, this translates to approximately 47-59 liters per hour (235 kW * 0.2-0.25 liters/kW-hour).
Comparative Analysis
#### 1. Fuel Efficiency
*Outboard Motors:* 300 liters per hour.
*Inboard Diesel with Stern Drive:* 50-60 liters per hour.
*Hybrid with Torqeedo Outboards and Diesel Generator:* 47-59 liters per hour.
The hybrid system offers similar fuel efficiency to the inboard diesel with stern drive and is significantly more efficient than traditional outboards.
#### 2. Environmental Impact
*Outboard Motors:* High emissions and noise.
*Inboard Diesel with Stern Drive:* Lower emissions than outboards.
*Hybrid System:* Lowest emissions, especially when operating on electric power alone.
Recommendation
The *hybrid system with 2x Torqeedo Outboards powered by a diesel generator* provides excellent fuel efficiency, the lowest environmental impact, and high operational flexibility. This system is ideal if the higher initial cost can be justified by long-term fuel savings and environmental benefits.
the hybrid system with 2x Torqeedo Outboards and a 235 kW diesel generator is the preferred choice.

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