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What features are provided?

EMP Motors provide boat owners with a combination of features unavailable from traditional propulsion systems, that include:

  • High torque at all times, assuring better control at the helm.
  • Quiet operation
  • Virtually no routine maintenance, no filters, belts or pulleys
  • No air or water pollution from fossil fuels
  • Built-in redundancy
  • Source for additional electrical power for on-board needs.
  • No winterizing required, there by extending the sailing season
  • Design life three times that of a diesel engine
  • Can be configured to be used for de-icing vessels while in the water in winter climates

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How much motoring time does an Electric Propulsion system provide?
Straight motoring times for the EMP Motors are dependent upon the type of boat, system configuration and sea conditions. The typical 30' sailboat with a EMP6 can average 5-6 hours at 4 knots. Boats with gensets significantly extend the range by producing electricity when the batteries are drawn down.

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What size boats are ideal for EMP Motor installations?
The EMP Motors are currently being installed in mono and multihull boats, ranging in sizes from 27' to 50'. Customized motors can be developed for other sizes and applications.

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How can I have an EMP system configured for my boat?
An EMP System can be configured for your boat by simply forwarding to Electric Marine Propulsion information regarding your boat (butch@electricmarinepropulsion.org) A survey form is provided on our Purchase page.

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How long does it take to install?
Standard installations take about 5 days. Additional services such as removal of existing motors, cleaning and repainting engine rooms or installation of new inverters will add a few days.

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Can I install the motor myself?
Owners can perform pre-installation preparation. EMP is available to perform the install or your qualified installer can install the system. Please contact us prior to self-install. A detailed installation guide is available. Service shops are being certified by Electric Marine Propulsion to perform installs.

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How much maintenance is needed?
Once the EMP Motor is installed, it requires very little maintenance. There are no belts, filters, pulleys or valves on EMP Motors. Systems with gensets will need its traditional maintenance.

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Where are EMP Motors in use today?
EMP Motor technology is in use around the world ,in monohull sailboats, multihulls and now power boats and "get home" systems.

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How fast will the EMP Motors move my boat?
The EMP Motor systems are configured to sustain hull speed. The EMP Motor can be used while sailing to increase speed in light winds, and stability in heavy seas.

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Which is more important in selecting a motor: HP or torque?
Both are important. It is important to understand the amount of torque your boat requires and then confirm that a motor has the ability to generate the needed torque. Many measure the power capacity of a motor by its horsepower; the more HP the more power. Horsepower is a measure of energy used to generate torque. Torque is the power resulting in propulsion (measured in foot-pounds). The typical sailboat achieves hull speed with RPM at the prop about 900-1200. It is the job of the motor to generate the RPM at the prop.

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When was the motor developed?
Dave Tether, founder of EMP, was co-designer of the technology used in EMP Motors in 1996. Electric Marine Propulsion continues to enhance this technology for marine use.

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How can the EMP Motors provide the same or more power than a higher horsepower diesel or gasoline motor?
The 12 horsepower EMP12 can outperform a higher horsepower diesel because it delivers 90-94% of its horsepower to the propeller. Typical diesel engines have losses before power is delivered to the propeller as shown:

Table 1 - Parasitic Losses with a typical Diesel Engine VS. An EMP12

 

Unit

EMP12

Diesel Engine

Rated HP

HP

12

30

Net Continuous HP

HP

12

25

Parasitic Loss

HP

0

10

Propeller Efficiency Loss

%

20%

40%

 

 

 

 

Net Horse Power to Propulsion

HP

9.6

6

These losses are further exacerbated by the typical use of a diesel engine. Maintenance on diesel engines very seldom includes bringing the engine to operating temperatures at least once per week during the life of the engine. Typically, many weeks and in most cases, months will pass between engine start-ups.

When a diesel is not run for extended periods of time, the lubricating oil necessary to prevent damage to the cylinders will work its way to the oil sump at the bottom of the engine. When the engine is started after even a relatively short period (4 weeks), the oil pump must pump oil back to the top of the engine to provide lubrication. This may take 5 to 15 seconds depending on the engine, which is sufficient time to result in scoring of the cylinder walls.

This scoring, over time, will decrease the ability of the cylinders to maintain the high levels of compression necessary in a diesel. Accordingly, over a relatively short period of time, significant power losses occur. These changes are gradual and frequently not noticed until the problem has reached engine failure. This cannot happen with EMP Motors. They will maintain their rated HP efficiencies for their entire lifespan.

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How many batteries are needed?
Optimum performance of the EMP Motor system is achieved with a 144-volt system. Twelve 12-volt batteries fill this need; Group U2, 27, 31 or 4D batteries are being used.

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Don't the batteries add too much weight to the boat?
The weight of batteries is a consideration, however, in most cases the weight of the old motor and full fuel tank exceeds the weight of the new system. To distribute weight when needed, we use AGM batteries which can be installed throughout the hull (AGM can even be installed effectively on their sides when properly secured). AGM batteries were developed to satisfy demands of F-15 Fighter Jets.

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How long will the batteries last?
The life cycle of batteries is dependent on their use. When properly used, the life cycles of the batteries exceeding five years can be achieved.

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What type of batteries do you use?
Greatest performance success continues to be from absorbed glass mat (AGM) batteries. AGM batteries have proven longer life spans than gel or flooded batteries. Additionally, AGM's are fully sealed and emit no dangerous gases. They also have slower discharge rates while inactive, at less than 3% per month of inactivity.

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How long does it take to recharge the batteries?
The batteries can be recharged several ways; a shore charger, genset and/or regeneration from prop.

A shore charger is included. The charger can restore the battery packs to full charge in three-four hours.

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Can solar panels be used to charge the batteries?
Solar panels are normally used to charge the 12 volt house batteries. If there is enough space on your boat to place 12 panels, then they can charge the 144 volt battery pack.

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Can wind generators be used to charge the batteries?
Wind is generally used to charge the 12 volt house batteries, due to the usual space restrictions of placing 12 wind generators on your boat.

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Why does the motor need 144 volts?
The EMP Motor System is designed to operate at peak efficiency levels with minimal impact on the batteries; 144-volts provides optimum performance beacuse the higher voltage means that the current is kept low which allows for longer battery life and more amp hours during daily use.

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What size EMP Motor do I need?
Like most motors, the EMP Motor is available in several sizes, and we will help determine the size to meet requirements. For information click Purchase or call Electric Marine Propulsion Sales Team. 239.463.1824. Our staff will answer questons, help you match your needs to the right Electric Propulsion System and components, and guide you through the sales and pricing agreement. We are dedicated to making your dream of clean, low maintenance, high comfort boating a reality with Electric Marine Propulsion Systems. Simply send your vessel information to: butch@electricmarinepropulsion.org.

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Where can I buy an EMP System?
EMP Systems can be purchased directly through Electric Marine Propulsion or through qualified dealers. For information click Contact or call Electric Marine Propulsion Sales Team 239.463.1824. Our staff will answer questions, help you match your needs to the right Electric Propulsion System and components, and guide you through the sales and pricing agreement. We are dedicated to making your dream of clean, low maintenance, high comfort boating a reality with Electric Marine Propulsion Electric Propulsion Systems.

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What maintenance is needed for winterizing?
The EMP Motor does not require winterizing. In fact, several owners have used the EMP Motors as a de-icing system. The motor running at a low rpm can circulate water around the boat to prevent icing.

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Are fleet purchases available?
Yes, contact butch@electricmarinepropulsion.org for fleet purchasing details.

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Can the EMP Motors be installed in new boats as they are being built?
Yes, Electric Marine Propulsion can coordinate with your boat builder for an EMP Motor install.

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What training is needed to operate the motor?
Training for use of the EMP Motor is simplified by the fact that we use most of the same controls you used with your diesel or gasoline motor.

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What new controls do I need?
The e-meter is a new control that will be added to your system. The e-meter provides battery performance and power usage data. The e-meter displays battery capacity in volts, amps in use, amps used and time in hours remaining in the battery bank. Alarms may be set by the user to warn of low power levels.

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Is the system safe?
The EMP Motor propulsion system is extremely safe. Safety is important to any propulsion system. Electricity, like gasoline and diesel, can be dangerous. Smart use of any power system is central to safety. We are currently working with the US Coast Guard for system certification.

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Do I need a genset?
Gensets are not required on all installations. However, gensets when used deliver many exciting options for powering on board electronics and appliances. Gensets will provide virtually uninterrupted power supply for entertainment equipment, cooking equipment, PC's, lighting, air conditioning and communications.

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Can I convert an outboard motor to EMP Technology.
Electric Marine Propulsion has converted several outboard motors to inboard EMP Motor systems. This is especially popular with multihulls.

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How can I use the battery power for other appliances in the boat?
Your new battery bank can be wired to power on-board appliances and other uses. Inverters and a genset may be recommended.

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Can I use my existng prop & shaft?
Be prepared to have your prop and shaft replaced. Often a longer prop shaft is needed, providing the ability to increase the prop size. Larger prop sizes deliver more power and control to the helmsman and serve to regenerate electricity faster.

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How will the Electric Propulsion System be serviced?
In the event your Electric Propulsion system needs servicing, contact Electric Marine Propulsion. An EMP technician or a trained Dealer/Installer in your area can be dispatched.

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What are the warranties?
The EMP Motors are warranted for 3 years, batteries are warranted for 1/5 years. (varies by manufacturer) Warranties are expressed as years of full coverage and years of pro-rated coverage.

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©Electric Marine Propulsion 2006 • 239.463.1824
 
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