Ample Power Genie$^{tm}$ with EnerMatic Controller
Installation and Wiring Instructions

Ample Power Models EG12-150, EG24-75, EG12-280, EG24-175 March 14, 2006
Copyright ©1989 through 2005. All Rights Reserved - Ample Technology


This manual covers the engine and system wiring for the diesel battery chargers manufactured under the Genie brand name by Ample Technology. The wiring for these units is different from the conventional units operated by a manual control switch.

Another manual covers the User Interface via a terminal or terminal emulator program running on a PC.

The Genie is a powerful battery charging system which uses a Kubota engine to drive a custom high output alternator. The marine engine is freshwater cooled with a bronze and cupro-nickel raw water heat exchanger. The land based unit uses a radiator.

The alternator is controlled by Smart Alternator Regulation, including temperature compensation and current limiting. The alternator regulation circuits are integrated within the EnerMatic Controller.

Major Components

There are three major components to the EnerMatic Controller. They are: the engine assembly, the control panel, also known as the local panel, and the controller assembly itself. Since the engine can be started with a remote computer, the control panel is also called the local panel. The local panel is optional.

There are also shunts, sensors, and relays to control solar, wind, and hydro sources. The battery shunt, alternator shunt, and battery temperature sensor are included with the EnerMatic Controller. Other items are optional.

The EnerMatic Controller interfaces to:

Interface to these external components is made with four pluggable terminal blocks, discrete spade lugs, and two DB-9 RS-232 connectors. A picture of the local panel is shown below. and below that the Remote Display. NOTE: There is a separate manual coveing the Systems Navigator, Remote Display.



NOTE: It is possible to use both the local panel and Remote Display with the EnerMatic, however, additional water temperature and oil pressure senders will be necessary since they cannot be shared by the two panels.

History of the Ample Power Genie

The Ample Power Genie has been in production since 1989 with many thousands of Amp-hours produced for thousands of happy users. The unit has been improved in many significant and minor ways since it was first introduced and is truly unsurpassed in performance.

In 1988 the owner of a remote cabin asked us to design a diesel battery charger. He recognized that using a generator to make AC, when he didn't need AC, wasn't the proper way to use resources.

During the design and construction of the first Genie, we couldn't help but tell some of our sailing friends. After seeing it in operation, they wanted one too. The Genie has proven to be reliable and highly functional as equipped with a Smart Alternator Regulator. The original Genie is still working today with no maintenance more complicated than changing oil and air filters.

With the addition of the EnerMatic Controller, the Genie can be automatically started and stopped based on battery condition.

Cautions and Warnings

Most people have never commissioned an engine, and through the years many have been far too creative in wiring, and plumbing changes to what the manual describes. Failure to follow the instructions in this manual will result in an inoperative and perhaps permanently damaged unit.

The most common problem encountered is lack of air-free fuel to the engine. Diesel engines take just four things to run ...air, fuel, fuel, and fuel. If the Genie engine has air and fuel, it will run at the correct RPM and produce the expected results.

The second most common problem is neglecting to enable current limiting. The engine does not have enough horsepower to drive the alternator at its maximum rating and without regulator current limiting engaged, the engine will either stall, or lope along at a low RPM where the alternator doesn't overload the available engine power.

Please read this manual thoroughly, and adhere to the suggestions provided.


Do not operate the Genie without a belt guard!

NOTE: The Genie is not equipped with a belt guard. Never work around the Genie when it is operating. Do not mount the Genie such that children or adults can come into contact with the Genie when it is running. After the Genie is installed, and before operation, provide a belt guard that will protect all persons from harm.


Do not share an intake thru-hull with another engine will most likely flood the Genie through the water line when the other engine is running. This has happened to people who have ignored this warning. Under all circumstances flooded engines void the warranty.


Do not overfill the crankcase with oil. You may just get an oily bilge when the excess blows out of the vent tube, or the vent tube may not be able to pass enough to prevent crankcase overpressure.


Do not use pure antifreeze in the heat exchanger. Not only is pure antifreeze a poor carrier of heat, but it also leaks through petcocks and gaskets. Use only a 50:50 mix of antifreeze and water.


If the engine is not mounted 24 inches above the waterline, use a siphon-break between the heat exchanger and the water injection port into the exhaust.


If any portion of the exhaust system is below the waterline, use a waterlift muffler. Mount it at least one foot below the exhaust outlet from the engine.

Make sure that any water which can drain back to the waterlift muffler, after the engine is off, will not be enough to flood the muffler and enter the engine. This usually means that the exhaust hose should go straight up from the waterlift muffler, and then begin a continuous down slope to the exhaust thru-hull.


Do not overcool the engine. Overcooling will result in carbon build up and loss of power.


Do not adjust the current higher than what the engine can provide without struggling. A diesel will emit black smoke when it is overloaded. Always turn the current adjustment down about 15-25% from the black smoke point.


Always let the engine warm up a little before turning on the regulator. When the batteries are low, the alternator will produce full current, which makes the engine work hard.


Do not adjust the throttle linkage so that the throttle solenoid cannot fully pull the plunger into the coil. The solenoid will burn out in a few seconds if this happens.

NOTE: This warning does not apply to units equipped with a fuel solenoid valve instead of the throttle solenoid. Units equipped with the fuel solenoid valve take 10-20 seconds after turn off before the engine stops.

Model Designations

This manual covers four Genie variants.

Model Number Voltage Amperage Cylinders
EG12-150 12 150 1
EG24-75 24 75 1
EG12-280 12 280 2
EG24-175 24 175 2

Fuel System

The Genie must be fed from a gravity tank, or an electric fuel pump. Note: Do not use a fuel pump that exceeds 10 PSI. A fuel return line is required. It is often possible to share the electric pump with the main engine, and almost always you can T the return line with that of the main engine. The return line fitting is located at the injector.

No fuel filters are supplied with the Genie. A filter is required, however. If you are not using the filters for the main engine to supply fuel to the Genie, you must mount a separate fuel filter. A filter and water separator unit is recommended.

Make sure that a gravity tank is properly vented. That is, no loops in the vent line where fuel can accumulate and block the vent line. What works as a gravity feed for a main engine may not work for the Genie. Whereas the main engine may be able to create enough suction to clear vent lines with flooded loops, the injector pump on the Genie is not able to do so.

Cooling System

The Genie uses a marine heat exchanger to remove heat from the engine, or in the case of remote sites, a radiator with an electric fan.. A salt water pump is supplied with the marine Genie, and the electric fan with landbased units. The pump can be mounted above the cooling water intake. Output from the pump goes to the heat exchanger. Water from the heat exchanger is fed into the exhaust to cool it permitting exhaust hose to be used. The hose between the heat exchanger and the exhaust must be plumbed during installation.

Note that if the unit is to be operated below the waterline, the hose from the heat exchanger to the muffler will need to be plumbed so that a siphon break can be mounted 2-3 feet above the waterline.

A water screen is required. The Genie pumps up to 5 gallons per minute of water, so use an appropriate water screen.

The engine is designed to run at about 190-210$^\circ$ F, ($ 88-105^\circ$ C). The water pump can be restricted if the salt water is too cold to allow the engine to reach temperature. If the engine runs too cool, there will be a buildup of carbon. The cylinder head should be running at about 230-250$^\circ$ F.

The marine heat exchanger should be filled with a solution of water and antifreeze, mixed 50:50. Do not pour antifreeze directly into the exchanger ...always pre-mix the antifreeze and water before pouring into the heat exchanger.

Make sure there is no air in the coolant system. Air in the coolant will allow operation up to a certain point and then rapidly overheat.

In keel cooled installations an expansion tank is required which is higher than the engine. The expansion tank must be able to withstand the typical pressure of the coolant system, 15-20 PSI.

Installations using the radiator must ensure that the radiator fill cap is higher than the engine coolant plumbing.

Exhaust System

Depending on where the Genie is mounted, and whether the exhaust is above or below the point of water injection into the exhaust, a water lift muffler and perhaps a siphon break will be required.

If the Genie is well above the water line, then it is possible to do without a water lift muffler. Just be sure that all of the exhaust hose is below the point where water is fed into the exhaust, so that no backflow into the dry muffler is possible.

If the engine is above the water line, but some part of the exhaust is higher than the point where water is fed into the exhaust, a water lift muffler is required.

NOTE: A siphon break device is necessary if the engine is below the water line. The siphon break should be mounted at least 24 inches above the water line ...more if mounted off the boat's centerline.

NOTE: Any time a water lift muffler is used, engine cranking must be limited to avoid flooding the engine. Since engine exhaust is necessary to pump the cooling water overboard, sustained cranking when the engine doesn't start can flood the engine. If the engine doesn't start after 20 seconds of cranking, disconnect the water pump electrical feed until the engine is running. Don't forget to re-connect the water pump once the engine runs.

A common problem with generators on small sail boats is flooding of the engine via the exhaust. The exhaust should be equipped with a shutoff valve so that the engine will not take on water in heavy weather.

NOTE: It is imperative to insulate the dry exhaust muffler if the Genie is to be mounted in a small compartment. Fiberglass tape can be used to reduce exhaust heat from the manifold.

Electrical System

The electrical system includes an electric starter, as well as the high output alternator. A glow plug(s) is also present on the engine. The glow plug, fuel solenoid and starter motor all operate from 12-volts, even on 24-volt models. A DC-DC converter can be used from the 24-volt supply to generate 12-volts to maintain a cranking battery. A small 12V alternator is provided on the G-280 and G-175 units.

Mounting the Genie

The Genie is equipped with four vibration dampening feet. The feet should be attached securely to a mounting floor. The mounting feet are failsafe, that is, they will not separate even if the rubber pads fail.

Plumbing the Marine Exhaust

After the Genie is securely fastened to the floor, the exhaust can be plumbed. If no water lift muffler is used, simply attach the exhaust hose to an exhaust thru-hull fitting. Be sure that all of the exhaust is below the point that water is injected into the exhaust line. Secure the exhaust hose to the dry muffler with two hose clamps.

If a water lift muffler is used, chose an appropriate location for it as close to the Genie as possible, and secure it to the floor. Exhaust hose can now be run from the Genie to the water lift muffler, and from the muffler to a proper thru hull fitting. The exhaust hose should be run as high as possible before it exits the hull so that sea water can not back flood the engine.

Exhaust hoses for the Genie are 1.5 inches, inner diameter. The exhaust thru-hull fitting should be 3-4 inches above the water line. A valve to protect the exhaust from flooding in heavy weather is suggested.

Plumbing the Marine Cooling Water

To plumb the cooling water, a separate thru-hull intake is required. A sea strainer is also necessary. If the Genie is mounted in a planing hull, be sure that the intake is underwater, even when planing.

Water hose size for the Genie is 1/2 inch. Connect the thru-hull to the sea strainer, and the strainer to the water pump. We recommend the use of two hose clamps on each connection. Hose clamps should be made from all stainless steel.

If the Genie is not mounted at least 24 inches above the water line, a siphon break is required between the heat exchanger and the exhaust. The siphon break should be mounted well above the water line.

Plumbing the Fuel System

The engine must be connected to a fuel source with positive pressure. As mentioned, a gravity tank or a fuel pump is necessary.

Fuel to the engine connects to the fitting near the throttle. Do not let the fuel line interfere with the throttle mechanism. A fuel return line must be connected to the fuel tank. The return fitting is located at the injector nozzle.

Electrical Wiring

Wires are required on the starter and the alternator.

The starter must be wired to a 12-volt battery for starting. It can be a separate battery, or the prime battery that the Genie charges. The starting wire should be a #8 gauge. The starter and fuel solenoid requires 12-Volt power. The main alternator can be 12, 24 Volts.

The positive output of the alternator must be connected to the battery that is being charged.

The negative output of the alternator must be connected to the negative distribution point for both the Genie starter battery and the battery being charged by the alternator (12/24-Volt).

Operating the Genie

The Genie is typically shipped without engine coolant or oil. Be sure to add coolant and oil before operating the engine.

Before operating the Genie, be sure that no obstructions are present that can interfere with belts and pulleys. Check the level of crankcase oil, and engine coolant. Open the sea water petcock for the Genie.

Before each use of the Genie, it is good practice to observe that there is coolant in the heat exchanger, and oil in the crankcase. For oil recommendations, refer to the Kubota manual. (For our own diesel engines we use Delo 400 15-40W from Chevron, which meets or exceeds warranty requirements of many U.S. made diesels.) After the first 1000 hours of operation, synthetic oil may be used to extend drain intervals.

Diesel Fuel

In many parts of the world, diesel fuel has a lower cetane rating than U.S. fuels. Even in the U.S. for our own diesels we use an additive regularly, and suggest that fuel be treated for the Genie with a diesel additive. These additives are extra refined oils that enable complete combustion and help to keep the engine injector clean. Some users report using a high grade two-cycle oil as an additive for low sulphur fuels typical in South America. Excessive smoking is often due to poor fuels, an overload on the engine, or insufficient fuel reaching the injectors.

Adjusting Engine RPM

NOTE: Units manufactured after September 28, 2004 no longer use a throttle solenoid. Instead a fuel shutoff solenoid valve is used. To adjust RPM loosen the two nuts on the top of the throttle lever so that it can be moved. After changing RPM to the desired value, re-tighten the two nuts.

The EnerMatic Controller uses either a gear tooth sensor or an AC sensor to determine if the engine is running, and how fast it is running. The gear tooth sensor is used on DC units, and the AC sensor is used for AC generators.

Alternator Current Limit

Alternator current limit is set on the EnerMatic controller. See that manual for specific instructions.

The engine produces black smoke when it is overloaded. The engine works hardest when current is high, and voltage is at the absorption point ...about 14.4/28.8 Volts. To place the engine under load, deeply discharge the battery and then begin charging. Adjust the current limit, to less than rated Amps. As the voltage rises, and before current through the battery declines, adjust the limit so that the engine is not producing black smoke. Final current adjustment should be 15-25% below the black smoke amperage.

Engine Troubleshooting

The most common cause of failure to start is lack of fuel, which can be caused by air in the lines, an empty tank, a fuel cock that is not on, a clogged fuel line or filter, or a tank which is not properly vented.

To bleed the engine, loosen the bleed nut above the fuel intake and allow all the air to escape. This nut takes a 12 mm wrench. After bleeding all the air from the system, the engine will usually start readily. It is possible to crank the engine at a high speed by holding the compression release lever open. After a few seconds drop the release and the engine should start immediately.

Check the throttle solenoid to assure that it fully engages the throttle. Check the air cleaner to verify that sufficient air flow is possible.

Make sure that the engine is not flooded with sea water. Is the exhaust sea cock open?

NOTE: Never spray any chemical into the intake of the engine. This can permanently damage internal parts.

Alternator and Regulator Troubleshooting

Refer to the EnerMatic Controller manual for more troubleshooting suggestions.

Installation and Warranty Support

For questions regarding installation, operation, or warranty service contact PowerTap, Inc. who is the authorized warranty service agent for all Ample Power products. Their phone number is 206-789-4743, and their fax is 206-789-9003.

Email support is available from See also the following websites for more troubleshooting suggestions.

Applying the EnerMatic Controller


The EnerMatic Controller automates monitoring, controlling, and regulation of the energy system. It does require set up, and besides wiring the system correctly, there are other considerations for a successful installation. This section discusses those issues.

Alarm Stop

We suggest wiring an alarm stop switch, and sensors which may trigger an alarm. A contact closure to ground on the alarm input, TB4-1, will immediately stop the engine. Normally the engine is allowed to run for a programmed cool down period when is it told to stop. The alarm stop input overrides the cool down time.

Other alarm sensors might include:

Internal Error Detection

The EnerMatic Controller detects many abnormal conditions such as high battery voltage, high load current. Set reasonable limits for those and enable their detection to activate the error output.

Local Control Panel

The local panel is not required in the system. It does provide gauges for water temperature, oil pressure, and operating hours. It also has some control switches and LEDs.

The EnerMatic Controller does count operating hours and stores them in non-volatile memory. It can also measure engine temperature and oil pressure. Thus the information shown on the gauges can also be obtained from the Controller. However, the sensors are different between the gauge sensors and those the EnerMatic uses.

Both sets of sensors are available, (see TB6) or the Genie engine can be built to use the EnerMatic gauges only.

As shown on the wiring diagram for the local panel, the switches are wired to produce 12V when activated. The switches alone can be used without the gauges.

The Armed LED

The Armed LED flashes rapidly anytime the unit is enabled to start automatically, or via the remote start input. Be sure to stay clear of the engine assembly anytime the Armed LED is flashing.

The Ready LED

The Ready LED indicates that the conditions for automatic start-up have been met. Placing the panel mode switch in automatic mode will start the engine.

The Running LED

The Running LED indicates that the engine is running.

The Error LED

The Error LED flashes rapidly to signal an error condition. The cause for the error can be determined by looking at the various status reports available from the terminal interface.

Starter Battery

The engine always needs 12 Volts. If the house battery is also 12V, then a dedicated starter battery is not necessary.

The EG12-280, and EG24-175 engines come with a small 12V alternator to maintain a starter battery.

Maintaining a starter battery for the EG24-75 can be done using an Equalizer which allows tapping the bottom 12V or a 24V bank.

Waste Heat Recovery

Waste heat recovery is possible with the land based EG12-280, or the EG24-175 unit. The engine temperature sensor which connects to TB6 must be plumbed into the coolant path. With this sensor, the radiator fan is intelligently controlled so that waste heat may be captured elsewhere.

Engine coolant can be circulated directly through the waste heat recovery device using the normal engine water pump. Sometimes that coolant circuit is not suitable for direct circulation and an exchanger is necessary.

When an exchanger is used, an additional output on TB2-7 can be used to circulate the coolant on the non-engine side of the exchanger.

Extended Drain Intervals using Post Stop

By using a large capacity oil tank, and periodically circulating oil through the engine from the tank, the interval between oil changes can be greatly extended. The feature is implemented as a post stop operation using the signal normally used as a water pump or radiator fan. When a post stop operation is configured, then the output signal is asserted each time to engine stops for the duration specified. Also specified is the intermission time imposed on the engine after the end of the post stop operation.

In the case of engine oil circulation 10-20 seconds after each stop is sufficient to add a quart or two to the engine, and 2-3 minutes should be allowed for the engine overflow to drain excess crankcase oil back into the long-run oil tank.

Consult the factory for more information about this option.

Shunt Ratings

The standard shunt is rated for 400 Amps. It can tolerate 100% overloads without failure, however extended overloads may distort the accuracy of readings.

Current is measured with a resolution of 1 part in 4096, so resolution is slightly less than 0.1 Amps with a 400 Amp shunt.

The EnerMatic Controller will operate with any shunt which produces 50 milliVolts full scale. The Amp rating of the shunt must be programmed for the controller to calculate current based on the drop across the shunt. Resolution in Amps will change. For instance with a 600 Amps shunt, resolution will be about 0.15 Amps.

Installation Checkout Menus

The User Interface provides a set of checkout functions which allow controlling and sensing all circuits. Use these functions and verify that all work before trying to start the engine.

CAVEAT: To conserve power when the engine is not running, some of the internal circuits are not powered. Before the switches on the engine and local panel can be read, the run output must be activated. Use the engine control checkout menu to assert the run output and then use the read menu to read the switch status. Read as often as necessary to check both on and off to the switches.

The hot water switch on the engine is normally closed. To test the circuit wiring, temporarily remove the wire from the switch.

The oil pressure switch is open when there is no oil pressure. To test the circuit wiring. momentarily ground the oil pressure switch.

Terminal Interface

The EnerMatic Controller will mate to a standard PC serial port using a straight-thru, 9-pin cable with one end male and the other end female. Cables can be patched together to form any length, although a single cable will be best for a permanent connection.

Baud rate is 19,200, 8 data bits, 1 stop bit, no parity.

If power is applied to the EnerMatic Controller before the terminal interface is operating, the start-up message from the Controller will be missed.

Wiring Diagrams






Terminal Block Descriptions

The EnerMatic Controller has terminal blocks labelled TB1 thru TB4. There are two terminal blocks on the engine, TB5, and TB6. The local panel has a terminal block labelled TB7. By observing the overall wiring diagram, the naming conventions will become clear. NOTE: TB6 is not always present. It provides optional signals which can be measured by the EnerMatic Controller.

There are also connections for high current signals. These are described later.

Mounting the EnerMatic Controller Assembly
The EnerMatic Controller is protected against ambient humidity, but must be mounted in a dry location free of moisture, dust, and other environmental insults. The EnerMatic Controller will operate in temperatures to 70$^\circ$C (158$^\circ$F).

Wiring Diagram
The wiring diagrams show the only way to wire the EnerMatic Controller. Do not wire it in any other way, such as combining ground wires or battery positive wires. For safety purposes, always use fuses where shown.

Signal Names and Functions
Battery voltage set-points are specified for each voltage system, 12 or 24 volts, as 12 / 24 volts, respectively. Note that 24V units still require 12V to operate the starter and other engine controls. The EMC always operates from 12V, while the alternator regulator operates from the voltage of the house bank.

TB1, EnerMatic Controller Assembly

TB2, EnerMatic Controller Assembly

TB3, EnerMatic Controller Assembly

TB4, EnerMatic Controller Assembly

TB5 - Engine Assembly

These two terminal blocks are wired point to point. The signals on these terminal blocks are all low level and low current.

TB6, Engine Assembly, Optional

TB7, Local Panel Assembly, Optional

High Current Connections

High current connections are made using push tabs. There are seven tabs on the left side of the EnerMactic Controller, and three on the right side.

The left side tabs interface to the engine, while the tabs on the right connect to the alternator.

The name of each tab is given on the wiring diagram.

Note that the engine control signals are separated from the analog circuits of the EnerMatic Controller through the use of optical couplers.

Push Tabs, Left Side

Push Tabs, Right Side


Ample Power products are manufactured by Ample Technology, 2442 NW Market St., #43, Seattle, WA 98107 - USA