11500W 20hp Electric Outboard – 48V

The motorzoo 11500W 20hp electric outboard is a high performance electric outboard motor in the 11.5 kilowatt (20hp) power range.
The 11500W 20hp motor is the largest and most powerful version of the motorzoo performance range of outboards.
It has the following specifications:

• Shaft. Adjustable long / medium / short shaft configuration to suit any application.
• Power. Rating of 11.5kW (approx. 20hp), drawing a maximum 240 Amps at 48 Volts.
• Propeller. Diameter 25cm (10 inch), pitch 25cm (10 inch), and spee 2400 RPM.
• Thrust. Force 1000 Newtons (225 Lb/pound). See guide to size motor for your boat
• Weight. Net 29kg (no battery).
• Motor. Patented hermetically sealed (watertight) magnetic induction drive motor. Brushless, no gears, no water pump.
• Controls. Smartphone interface. Tiller throttle, or optional remote throttle & steering.

The motorzoo 11500W 20hp electric outboard is not a simple trolling motor.

It is a very high performance electric outboard power unit with patented features and an innovative design:

• Mimimal moving parts. The unit has an absolute minimum of moving parts.
  Accordingly, there are fewer things that can go wrong in the marine environment.
• No moving seal. The motor itself is self contained and hermetically enclosed (watertight) within a bulb at the bottom of the shaft.
  As a result, there is no chance of water ingress into the electrical windings.
• Magnetic induction drive. The motor itself drives a magnet.
  In essence, this magnet induces rotation in another magnet that is attached to the propeller.

This means there is no possibility of water ingress into the motor compartment. How is this possible? Through an innovative, patented design.

The propeller and its magnet are in a separately sealed unit that bolts onto the motor unit.

This design is the result of years of experience, trial, and error in using electric drive units in the marine environment. The design has another advantage:

• No cooling system required. Because the motor unit is immersed in water, it is naturally cooled by the flow of water around it.

Having no requirement for cooling circuits means one less thing that can go wrong. But there are more benefits to the design:

• No driveshaft required.  The shaft only contains the power cables that are required to power the motor. This means fewer moving parts.

There are other advantages of not having a fixed drive shaft:

• Elimination of gears. No drive shaft means no need for gears at the bottom of the shaft.
• Adjustable shaft length. This means that the 11500W 20hp electric outboard is adaptable to short, medium, or long shaft applications.

It can be used on a speed boat in shallow waters, or on a bracket attached to the transom of a 13 meter yacht, as an auxilliary motor.

Overall, the holistic design approach to the 11500W 20hp electric outboard has produced an elegant simplicity that can produce 10,000 hours of trouble free operation.

That is why motorzoo is able to offer a 4 year / 10,000 hour warranty on the outboard.

Item	SKU	Description	Price	Qty	Net
	OMD-115-48	11500W 20hp Electric Outboard - 48V	$8,497.00	1	$8,497.00
	CMD-050-B3	2AWG Cable 350 Amp Extension 35mm2 - 2m Length	$410.00	1	$410.00
	Subtotal Motor & Cable				$8,907.00
	CMD-050-B3	6AWG Cable 350 Amp Parallel Adapter 16mm 2	$165.00	1	$165.00
	CMB-050-M8	6AWG Cable 120 Amp Battery Lead 16mm 2	$68.75	1	$68.75
	BOA-050-B1	2500Wh 48V LiFePO4 Battery	$1,694.00	3	$5,082.00
	Subtotal Battery & Cables				$5,315.75
	Total Bundle				$13,989.00

There are two types of electric outboard motors. That is:

• trolling motors. Trolling motors will produce limited trust because of their limited power and propeller configurations.
  A trolling motor might drive a dinghy of up to 3 meters in length, with a weight of up to say 200kg, to a speed of up to 4 knots.
  But not much faster.
• performance motors. Performance motors such as the 11500W 20hp create more torque, and are designed to drive larger craft.
  Say up to 15 meters, with greater weights, up to 4,000kg, to greater speeds.

The maximum speed achievable will depend on factors such as:

• watercraft displacement;
• waterline length;
• motor speed;
• propeller diameter and pitch, and;
• other factors.

Electric outboard motors are very different to petrol outboard motors, on a number of levels:

Torque.

Electric outboards maintain a higher torque throughout the RPM range.
This means that electric outboards will have a higher peak torque for a given power output.

Efficiency.

Electric outboards operate at about 80% efficiency, with about 20% being lost as heat.
With petrol outboards, only about 25% of the energy converts to propulsion, with about 75% lost as heat.

Emissions.

Electric outboards have no noxious emissions, whereas small petrol motors generate lots of noxious emissions.
Not just CO₂, but unburnt hydrocarbons, SO₂, and NO_x.
This is why the sale of two-stroke motors have been banned in Australia.

Noise.

Electric outboard motors operate at much lower noise levels than petrol motors.
This is especially true when the motor unit is immersed underwater.

Complexity.

Electric outboard motors have very few moving parts.
Small petrol engines, especially four-stroke ones, have an excessive number of parts, for their small size.

Power.

Larger petrol engines (of 50hp or more) have an advantage over electric motor driven models.
They can deliver the power required to get watercraft planing at high speeds for long periods.
This is why electric outboards with more than 20hp power rating are not common.

 

Electric outboard motors have very different power characteristics to shaft driven petrol outboards.

As mentioned above, the torque/RPM profile is different to start with.

And it has been found that the typical chassis seen with petrol outboards is not very suitable for conversion to electric motor use.

The traditional chassis was found to vibrate excessively when electric motors are fitted, and so a new design approach was required.

The holistic design approach of the 11500W 20hp electric outboard has allowed the introduction of performance enhancing features as mentioned above.

And it has also allowed the removal of certain features that contribute little or nothing to the motor performance.

The motorzoo 11500W 20hp electric outboard is the most powerful of our performance range of electric outboard motors:

• The 11500W 20hp motor has a power rating of 11.5 kilowatts.
• The motor draws a peak current of 240 Amps, and therefore requires a battery of sufficient voltage to meet these requirements.
• This is why uses a 48V (48 Volt) Lithium-Iron-Phosphate power supply. Any battery of less than 48V would not provide the current required.
• Additionally, any battery of more than 48V would require special safety certification to work on.
  So 48V provides the sweet spot for power delivery.

It is important that the battery power supply is able to deliver the peak current of the electric motor that it powers.
Otherwise there could be damage to the battery management system.

• A 50 Amp hour (48v50Ah) LifePO₄ Battery will typically be able to deliver a peak current of 100 Amps.
• Therefore, a mimimum of three 48v-50Ah batteries would be required for the 11500W 20hp motor.
  (Note, a 30Ah battery would not be sufficient).
• The combination of 3x 50Ah batteries in parallel will deliver peak current of 240A for about 50 minutes.
  (Note that this represents the minimum operating time, as it assumes full throttle for the whole time.)

At motorzoo we are obsessed with operating safety. This is why we prefer LiFePo₄ batteries over ternary Lithium-Ion (Li-Ion) Batteries:

• LiFePo₄ batteries are much safer to use than Li-Ion batteries, especially in an aquatic environment.
• We also prefer connections and cables with the highest water resistance rating.