12.5 EDT D-NET – 12.5kW, 60 Hz Diesel Generator
$29,488.00
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Description
Westerbeke 12.5 EDT D-NET 12.5 kW 60 Hz Marine Diesel Generator
The NEW Westerbeke 12.5 EDT D-NET 12.5 kW 60 Hz Marine Diesel Generator is a low-speed, electronically governed generator designed to provide dependable onboard power for motor yachts, sailing yachts, cruising catamarans, passenger vessels, workboats, and other marine applications.
Operating at 1800 RPM, this Westerbeke generator combines a four-cylinder naturally aspirated diesel engine with a brushless four-pole alternator, freshwater cooling, digital diagnostics, remote-start capability, automatic safety shutdowns, and D-NET communication. The standard single-phase configuration delivers 12.5 kW at 120/240V, 60 Hz, with rated current of approximately 104.2/52.1 amps. (Westerbeke)
Its 12.5 kW output makes it suitable for powering compatible marine air-conditioning systems, refrigeration, battery chargers, freshwater pumps, water makers, lighting, galley appliances, navigation electronics, communication systems, and other essential onboard electrical loads.
Important Availability Information
The original 12.5 EDT D-NET 12.5 kW is no longer in production, although Westerbeke continues to provide technical documents and parts information for the model. The newer 12.5 EDT D-NET 12.5 kW is listed in Westerbeke’s current generator range. Availability of the original EDT version may therefore be limited to existing dealer stock, unused surplus units, or replacement-market supply. (Westerbeke)
Customers purchasing existing stock should confirm the generator’s condition, serial number, manufacturing date, warranty status, electrical configuration, and included accessories before completing an order.
Quiet 1800 RPM Four-Cylinder Operation
The Westerbeke 12.5 EDT is powered by a four-cylinder, four-stroke marine diesel engine with a vertical inline arrangement. It has a displacement of approximately 107.27 cubic inches or 1.758 litres, a 3.07-inch bore, a 3.62-inch stroke, and a compression ratio of 22:1.
The naturally aspirated engine produces approximately 25 horsepower at 1800 RPM. Its forged crankshaft is supported by five main bearings, while the cast-iron cylinder block and cylinder head provide a strong foundation for extended marine generator operation.
Key engine characteristics include:
- Four-cylinder vertical inline configuration
- Four-stroke diesel operation
- Naturally aspirated air intake
- 1.758-litre displacement
- Electronic engine governor
- 1800 RPM rated speed
- Freshwater cooling
- Cast-iron cylinder head and block
- Forged crankshaft with five main bearings
- Swirl-type combustion system
The four-cylinder configuration provides smooth power delivery and reduced vibration compared with many smaller generator platforms. Westerbeke also equips the unit with a tuned air-intake silencer and fail-safe rubber anti-vibration mounts to improve onboard comfort.
12.5 kW of Continuous 60 Hz Marine Power
The standard Westerbeke 12.5 EDT-614 configuration delivers 12.5 kW of single-phase electrical power at 60 Hz.
| Electrical specification | Published rating |
|---|---|
| Rated output | 12.5 kW |
| Voltage | 120/240V |
| Frequency | 60 Hz |
| Phase | Single phase |
| Number of wires | Four |
| Power factor | 1.0 |
| Rated current | 104.2/52.1 amps |
| Operating speed | 1800 RPM |
| Starting method | Remote electric start |
The generator may also be configured for 50 Hz operation, where the corresponding published rating is 9.4 kW at 230V and 1500 RPM. Westerbeke’s documentation also states that three-phase versions were available at compatible 50 Hz and 60 Hz ratings. (Westerbeke)
A vessel’s electrical system should be assessed before selecting a generator. The calculation should include normal running loads, motor and compressor startup demand, battery-charger consumption, simultaneous appliance use, and sufficient reserve capacity.
Electrical equipment with high starting current can include:
- Marine air-conditioning compressors
- Refrigerators and freezers
- Water makers
- Freshwater and seawater pumps
- High-output battery chargers
- Ventilation fans
- Hydraulic power packs
- Galley appliances
Correct generator sizing helps prevent voltage drop, frequency instability, difficult compressor starting, overload trips, excessive engine loading, and premature wear.
D-NET Digital Generator Control
The Westerbeke D-NET system gives the operator access to generator operating information and diagnostic data through a digital display and control panel.
The display can provide information for:
- Engine oil pressure
- Coolant temperature
- Exhaust temperature
- Starting-battery voltage
- Generator voltage
- Generator frequency
- Generator operating hours
- System warnings and shutdown conditions
The panel uses illuminated indicators to provide an at-a-glance view of generator condition. Additional operational or diagnostic information can be accessed through the digital screen without requiring the operator to interpret basic numeric fault codes manually.
The generator was offered with Westerlink communication or optional NMEA 2000-compliant databus communication, allowing compatible generator information to be integrated into a vessel’s networked monitoring system. Optional remote digital displays and remote start-and-stop controls were also available. (Westerbeke)
Actual network compatibility depends on the generator’s installed control version, harness, communication module, vessel network, and display equipment. The exact configuration should therefore be checked using the generator serial number.
Electronic Governing for Stable Frequency
The Westerbeke 12.5 EDT D-NET 12.5 kW uses an electronic engine governor to maintain the correct operating speed as onboard electrical demand changes.
When a large compressor, pump, charger, or motor starts, the generator experiences an immediate increase in mechanical load. The governor responds by adjusting fuel delivery to help maintain the rated 1800 RPM engine speed and stable 60 Hz electrical frequency.
Westerbeke specifies frequency regulation of approximately 0.5 Hz, or 0.60%, between no load and full load. The manufacturer describes the electronic governing system as virtually eliminating the speed “droop” that may occur when an electrical load is applied. (Westerbeke)
Stable engine speed supports the operation of:
- Marine air-conditioning systems
- Battery chargers and inverters
- Refrigeration compressors
- Electric motors and pumps
- Navigation electronics
- Communication systems
- Lighting and monitoring circuits
Electrical stability still depends on correct generator loading, wiring, grounding, circuit protection, ventilation, and installation.
Brushless Four-Pole Alternator
The 12.5 EDT D-NET 12.5 kW uses a brushless four-pole revolving-field alternator with a direct-connected centrifugal cooling blower.
Published alternator features include:
- Brushless design
- Four-pole construction
- Revolving electrical field
- Class H insulation
- Approximately ±5% voltage regulation
- Approximately 0.5 Hz frequency regulation
- Direct-connected cooling blower
- Marine electromagnetic-interference protection
The four-pole design allows the generator to produce 60 Hz electricity at 1800 RPM. A two-pole 60 Hz generator would normally need to operate at 3600 RPM.
Benefits of the low-speed four-pole arrangement may include smoother operation, lower mechanical frequency, reduced noise, and improved suitability for extended marine use.
Westerbeke states that the alternator’s electromagnetic-interference performance exceeds the requirements of most marine radio telephones and standard televisions. (Westerbeke)
Freshwater Cooling with Heat Exchanger
The Westerbeke 12.5 EDT D-NET 12.5 kW uses a freshwater-cooled marine engine with a heat exchanger.
Internal coolant circulates through the engine and exhaust manifold. Seawater passes through the heat exchanger to remove heat before being discharged through the water-injected exhaust arrangement.
The cooling package includes:
- Closed freshwater cooling circuit
- Marine heat exchanger
- Gear-driven raw-water pump
- Freshwater-cooled exhaust manifold
- Coolant-recovery tank
- 45-degree water-injected exhaust elbow
The engine cooling-system capacity is approximately 8 US quarts or 7.6 litres. The raw-water inlet connection is 1 inch, while the exhaust-elbow connection is 2 inches outside diameter.
Routine cooling-system maintenance should include checking:
- Coolant level and condition
- Raw-water intake and seacock
- Seawater strainer
- Raw-water pump impeller
- Heat-exchanger tubes
- Cooling hoses and clamps
- Exhaust mixing elbow
- Wet-exhaust hose
- Siphon-break arrangement
- Machinery-space ventilation
Restricted seawater flow, a worn impeller, fouled heat exchanger, blocked exhaust elbow, or insufficient ventilation can cause overheating even when the generator is operating below full electrical load.
Self-Bleeding Diesel Fuel System
The Westerbeke 12.5 EDT D-NET 12.5 kW incorporates a self-bleeding fuel system with an electric fuel-transfer pump.
Its fuel-system features include:
- Bosch-type fuel-injection pump
- Throttle-type injectors
- Primary and secondary replaceable fuel filters
- 12V electric fuel-transfer pump
- Fuel supply and return connections
- Solenoid fuel shutoff
- Self-bleeding design
The self-bleeding arrangement helps simplify filter replacement and fuel-system servicing. However, the vessel should still have a correctly sized marine fuel-water separator installed between the tank and generator.
Westerbeke specifies approximate full-load fuel consumption of 1.27 US gallons per hour, or 4.8 litres per hour, at 1800 RPM. Actual consumption will vary with electrical loading, installation conditions, engine condition, fuel quality, maintenance, and ambient temperature. (Westerbeke)
Automatic Safety Shutdown Protection
The D-NET control system monitors several important generator operating conditions and can shut the engine down when potentially damaging conditions are detected.
Published protection functions include:
- Engine overspeed
- Engine underspeed
- Low engine-oil pressure
- High coolant temperature
- High exhaust temperature
The digital display and diagnostics panel helps the operator identify the reason for a warning or shutdown.
The generator also includes:
- AC circuit breaker
- 50-amp battery-charging alternator
- 12V starting motor
- Digital control and diagnostic panel
- Remote-start capability
- Belt guard
- Oil drain hose and drip tray
Automatic shutdown protection reduces the risk of severe engine or alternator damage, but it does not replace routine inspection and preventive maintenance.
Sound Guard SST Enclosure Option
The Westerbeke 12.5 EDT D-NET 12.5 kW can be installed with the optional Sound Guard SST acoustic enclosure, part number 53463 for the digital model.
The enclosure uses a stainless-steel base and frame with powder-coated aluminium panels. This construction is designed to resist corrosion while reducing airborne generator noise. Removable panels provide access for routine servicing.
Approximate Sound Guard SST specifications are:
| Enclosure measurement | Specification |
|---|---|
| Length | 39.5 in. / 1,003 mm |
| Width | 23.2 in. / 589 mm |
| Height | 25.3 in. / 643 mm |
| Weight | 94 lb. / 43 kg |
The enclosure adds to the generator’s overall installation dimensions and weight. Machinery-space measurements should therefore be checked using the correct installation drawing before ordering.
Compact Installation Footprint
The base generator has an approximate dry weight of 580 lb. or 263 kg.
The official product page and installation drawing provide slightly different overall length measurements depending on the drawing reference and fitted components. Westerbeke’s model page lists approximately 35.20 × 19.10 × 24.00 inches, while the specification drawing shows a principal generator length of approximately 34.6 inches. Installers should therefore use the applicable serial-number-specific installation drawing rather than relying solely on catalogue dimensions. (Westerbeke)
| Measurement | Approximate specification |
|---|---|
| Length | 34.6–35.2 in. |
| Width | 19.1 in. |
| Height | 24.0 in. |
| Dry weight | 580 lb. / 263 kg |
| Maximum continuous inclination | 15° in all directions |
Before installation, confirm:
- Machinery-space dimensions
- Access for lifting and removal
- Generator mounting centres
- Service clearances
- Sound-enclosure clearance
- Raw-water inlet position
- Exhaust routing
- Fuel supply and return lines
- AC cable route
- Starting-battery cable route
- D-NET or NMEA network route
- Ventilation requirements
Matching only the kilowatt output is not sufficient when replacing an existing marine diesel generator. Voltage, frequency, phase, dimensions, mounting, exhaust, cooling, electrical protection, and vessel-control integration must also be reviewed.
Typical Marine Applications
Motor Yachts
The 12.5 EDT D-NET 12.5 kW may power compatible air-conditioning systems, refrigeration, battery chargers, lighting, pumps, water makers, navigation electronics, galley appliances, and entertainment systems.
Sailing Yachts and Cruising Catamarans
Its low-speed operation and 12.5 kW output make it suitable for compatible cruising vessels requiring independent electricity while underway or at anchor.
Liveaboard Boats
The generator may support refrigeration, water systems, domestic appliances, battery banks, lighting, climate control, and electrical outlets during extended periods away from shore power.
Workboats and Professional Craft
The unit may provide auxiliary electricity for pumps, communication systems, chargers, work lighting, refrigeration, ventilation, monitoring systems, and other operational loads.
Passenger and Hospitality Vessels
Compatible applications can include galley appliances, refrigeration, passenger lighting, air conditioning, entertainment systems, pumps, and battery charging.
Generator Replacement Projects
The 12.5 EDT D-NET 12.5 kW may be used to replace an older generator where its electrical, mechanical, cooling, exhaust, and control requirements are compatible with the vessel.
Westerbeke 12.5 EDT D-NET Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Westerbeke |
| Model | 12.5 EDT D-NET |
| Generator type | Marine Diesel Generator |
| Rated output | 12.5 kW |
| Voltage | 120/240V |
| Frequency | 60 Hz |
| Phase | Single Phase |
| Rated current | 104.2/52.1 Amps |
| Power factor | 1.0 |
| Rated speed | 1800 RPM |
| Starting method | Remote Electric Start |
| Engine configuration | Four-Cylinder Vertical Inline |
| Engine cycle | Four-Stroke Diesel |
| Aspiration | Naturally Aspirated |
| Displacement | 107.27 cu. in. / 1.758 L |
| Bore × stroke | 3.07 × 3.62 in. |
| Compression ratio | 22:1 |
| Engine output | Approximately 25 HP at 1800 RPM |
| Governor | Electronic |
| Fuel injection pump | Bosch Type |
| Fuel system | Self-Bleeding |
| Fuel-transfer pump | 12V Electric |
| Full-load fuel consumption | Approximately 1.27 GPH / 4.8 LPH |
| Alternator | Brushless, Four Pole |
| Voltage regulation | Approximately ±5% |
| Frequency regulation | Approximately 0.5 Hz |
| Cooling | Freshwater with Heat Exchanger |
| Cooling-system capacity | 8 qt. / 7.6 L |
| Raw-water connection | 1 in. |
| Exhaust connection | 2 in. OD |
| Starting electrical system | 12V DC, Negative Ground |
| Battery-charging alternator | 50 Amps |
| Approximate dimensions | 34.6–35.2 × 19.1 × 24.0 in. |
| Dry weight | Approximately 580 lb. / 263 kg |
| Sound enclosure | Optional Sound Guard SST |
| Production status | Discontinued; technical and parts support retained |
The published specifications are based on Westerbeke’s official advanced specification sheet and model-support page. Generator configuration can vary by serial number and optional equipment.
Standard Features
The Westerbeke 12.5 EDT D-NET 12.5 kW was supplied with features including:
- Four-cylinder freshwater-cooled diesel engine
- Brushless four-pole alternator
- Electronic engine governing
- Digital display and diagnostics panel
- Automatic safety shutdowns
- AC output circuit breaker
- 50-amp battery-charging alternator
- Power takeoff interface
- Self-bleeding fuel system
- Coolant-recovery tank
- Gear-driven raw-water pump
- Water-injected exhaust elbow
- Tuned air-intake silencer
- Fail-safe rubber anti-vibration mounts
- Lubricating-oil drain hose
- Drip tray
- Top and side oil-fill points
- Belt guard
- Operator’s manual and parts documentation
These features are listed in Westerbeke’s official model literature.
Available Optional Accessories
Original optional equipment included:
- NMEA 2000-compliant databus communication
- NMEA 2000 remote digital display
- Westerlink remote digital display
- Remote start-and-stop panel
- Sound Guard SST enclosure
- Hydro-Hush muffler and fittings
- Fuel-water separator
- Anti-siphon valve with stainless-steel loop
- Ship-to-shore transfer switch
- Power takeoff adapter
- Onboard spare-parts kits
- Extended cruising spare-parts kit
- Technical manual
- White generator finish
Availability of original accessories should be confirmed because the EDT model is no longer in production.
Frequently Asked Questions
How much power does the Westerbeke 12.5 EDT produce?
The generator produces 12.5 kW at 60 Hz and 1800 RPM in its standard 120/240V single-phase configuration.
Is the Westerbeke 12.5 EDT D-NET 12.5 kW still manufactured?
No. Westerbeke identifies the original 12.5 EDT as no longer in production. Parts information, manuals, diagrams, and technical documents remain available. The newer 12.5 EDTA is listed in the manufacturer’s current range. (Westerbeke)
Is this generator NMEA 2000 compatible?
The 12.5 EDT was available with NMEA 2000-compliant databus communication and an optional remote NMEA 2000 digital display. Compatibility should be verified from the generator’s serial number and installed control package.
What voltage does the 12.5 EDT provide?
The standard 60 Hz single-phase model provides 120/240V output with rated current of 104.2/52.1 amps.
Does it operate at 1800 RPM?
Yes. The 12.5 EDT D-NET 12.5 kW, 60 Hz configuration operates at 1800 RPM.
How many cylinders does the engine have?
It uses a four-cylinder, vertical inline diesel engine with approximately 1.758 litres of displacement.
Is a sound enclosure available?
The generator supports the optional Westerbeke Sound Guard SST, originally listed under part number 53463 for the digital model. Current availability should be confirmed before ordering.
Can it replace another 12.5 kW boat generator?
Potentially, but the installer must confirm voltage, frequency, phase, overall dimensions, mounting centres, weight, cooling, exhaust, fuel connections, electrical wiring, and control compatibility.
Request a Quote for the Westerbeke 12.5 EDT D-NET
The Westerbeke 12.5 EDT D-NET 12.5 kW 60 Hz Marine Diesel Generator provides a strong combination of low-speed operation, four-cylinder diesel performance, electronic governing, digital monitoring, freshwater cooling, and dependable onboard electrical output.
Contact our marine generator team to confirm:
- Current stock availability
- New, unused, or replacement-unit condition
- Serial number and manufacturing date
- Warranty status
- Voltage and phase configuration
- D-NET or NMEA 2000 configuration
- Included control panel and accessories
- Sound Guard availability
- Packing dimensions and weight
- Domestic or international shipping options
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