Description

Cummins Onan Marine QD 11.5MDKDM-8138A Generator for Sale

The Cummins Onan 11.5MDKDM-8138A is an 11.5 kW, 60 Hz marine diesel generator for compatible onboard electrical installations. The MDKDM’s published 60 Hz operating speed is 1,800 RPM, and Cummins identifies a V1505 diesel engine for this specific model.

Contact Marine Inboard Specialists for a quotation covering the generator, sound shield, controls and installation accessories required for your vessel.

For a replacement project, establish the boat’s voltage, frequency, phase configuration and installation requirements before selecting the package. These details determine how the supplied generator connects to the existing onboard system.

Request Price & Availability | View Cummins Model Information

Onboard Power for Yacht and Boat Equipment

The 11.5MDKDM-8138A can be considered for vessels requiring a 60 Hz auxiliary power supply. Prepare a load schedule covering equipment such as air conditioning, battery chargers, refrigeration, watermakers, pumps and galley appliances.

Sizing should account for equipment that operates simultaneously and the starting demand of motors or compressors. A generator’s kW rating alone does not establish which air-conditioning units or other motor loads it can start.

For example, a charger drawing 2.5 kW from the AC supply, 2.0 kW of galley equipment and 3.0 kW of other running loads total 7.5 kW before additional equipment or motor starting. This illustrative calculation helps prepare an enquiry; your installer still needs to assess starting current, power factor and permissible loading.

Kubota Diesel Engine and Generator Configuration

Cummins’ MDKDM operator manual identifies the engine as a Kubota V1505, a water-cooled, four-cylinder diesel with approximately 1.5 litres displacement and electronic governing. The manual describes a four-pole, brushless alternator for the MDKDM family.

When comparing quotations, retain the complete designation 11.5MDKDM-8138A and request the actual generator serial number and specification details. A general reference to “Onan 11.5 kW” does not identify every electrical, cooling or equipment option.

Technical Specifications

Cummins’ exact-model page confirms the 60 Hz frequency and V1505 engine. The reference dimensions and electrical ratings below come from Cummins Bulletin 5410550, revision October 2017, with engine details from operator manual A052J727, October 2015. Match these family specifications to the actual 8138A assembly offered.

Specification	Published reference / ordering requirement
Product designation	Cummins Onan Marine QD 11.5MDKDM-8138A
Generator family	MDKDM
Application	Marine auxiliary AC power
Published electrical rating	11.5 kW / 11.5 kVA at 1.0 power factor
Frequency	60 Hz
Operating speed	1,800 RPM
Phase	Single-phase reference
Family AC output options	120 V or 120/240 V; confirm supplied connection
Engine	Kubota V1505 diesel
Cylinders / displacement	4 / approximately 1.5 litres
Alternator	Four-pole, brushless
Starting-battery system	Confirm supplied 12 V or 24 V configuration
Cooling	Water-cooled; establish heat-exchanger or keel-cooled configuration
Housed dimensions, L × W × H	Approximately 1,033 × 566 × 593 mm
Published housed weight	Approximately 315 kg
Published unhoused weight	Approximately 290 kg
Sound shield and remote controls	Identify in the quotation
Emissions and conformity documents	Confirm for the offered build and destination

Sources: Cummins MDKDM/MDKDN specification sheet and Cummins MDKDK–MDKDN operator manual. Dimensions and weight vary with configuration.

Allow additional room for connections, sound-shield removal and servicing. Obtain the installation drawing applicable to the offered unit before finalising mounts or machinery-space modifications.

Match the 60 Hz Electrical Supply

This model is documented as a 60 Hz generator. The MDKDM family also has a separate 9.5 kW, 50 Hz rating at 1,500 RPM; that rating should not be substituted for the 11.5 kW, 60 Hz configuration.

Have the quotation state the supplied AC voltage and connection arrangement. The generator’s DC starting-battery voltage is a separate specification from the AC power supplied to the boat.

For a 120/240 V installation, your electrician should assess circuit distribution and the permissible loading of each leg. Include shore-power changeover, inverter/charger integration and existing protection equipment in the review.

Controls, Monitoring and Fault Information

The Cummins operator manual describes local and remote control arrangements, with an optional digital display. Depending on the fitted equipment, the display can show AC voltage, frequency, coolant temperature, oil pressure, battery voltage and running hours. It also provides fault information following a shutdown.

Specify the control panel, required cable length and any existing vessel-monitoring interface when requesting the package. Establish compatibility before retaining older panels or harnesses.

For a replacement following repeated shutdowns, provide the recorded fault codes and operating conditions alongside the generator identification details.

Three Checks Before Replacing Your Marine Generator

Match the Electrical System

Send the existing generator’s make, complete model, serial number, rated output, voltage, frequency and phase. Include daily operating hours, simultaneous running loads and the largest motor-starting demand.

Identify the equipment you intend to add after the replacement. Future air-conditioning, charging or watermaker upgrades should form part of the sizing review.

Match the Machinery Space

Measure the available length, width, height, access opening and service clearances. Provide photographs of the mounting bed, lifting route and surrounding equipment.

Compare the complete supplied assembly with the space available. Sound shields, connections and maintenance access affect the installation beyond the generator’s basic dimensions.

Match Cooling, Exhaust and Fuel Connections

Identify the existing cooling arrangement, exhaust route, fuel connections and starting-battery supply.

For a heat-exchanger installation, have the installer review the seawater intake, strainer, pump arrangement and discharge path. Include exhaust routing and water-ingress prevention in the installation assessment.

If the previous generator failed after overheating or water ingestion, investigate the cause before commissioning its replacement.

Fuel Consumption and Operating Plans

Cummins’ marine sales brochure lists the following 11.5 kW MDKDM reference fuel-consumption figures.

Electrical load	Published fuel consumption
25%	1.7 litres/hour
50%	2.5 litres/hour
75%	3.2 litres/hour
Full load	3.9 litres/hour

These are manufacturer reference figures rather than a vessel-specific fuel-use guarantee. Request the applicable data for the offered build and use your expected load profile when planning endurance.

Generator Package and Scope of Supply

Request an itemised quotation identifying the generator assembly, sound shield, local and remote controls, wiring harnesses, mounts, cooling equipment, exhaust components and installation accessories included.

State which boat-side components your installer intends to retain. Identify installation labour, replacement plumbing, electrical modifications, commissioning and optional maintenance spares separately.

This establishes the complete marine generator replacement cost and makes competing offers easier to compare.

Compare Related Cummins Onan Generators

For greater output at 60 Hz, compare the Cummins Onan Marine QD 13.5MDKDN-8140A. Cummins identifies that model as a separate 60 Hz generator.

For another electrical configuration, explore the Cummins Onan Marine QD 11MDKDN-8214A. Compare its applicable frequency, voltage and output against your vessel’s requirements.

Price, Delivery and Warranty

Request a Cummins Onan 11.5MDKDM-8138A price for the package and delivery destination required. The quotation should identify equipment condition, supplied configuration, included accessories, availability, estimated dispatch date, freight and applicable taxes.

Obtain written warranty terms for the actual unit, including the warrantor, coverage period, territory and any installation, registration or commissioning requirements.

For international enquiries, provide the destination country and required emissions or conformity documentation.

Frequently Asked Questions

What is the rated output of the 11.5MDKDM-8138A?

The published MDKDM reference is 11.5 kW at 60 Hz, operating at 1,800 RPM.

Is this model suitable for a 50 Hz boat?

Its documented frequency is 60 Hz. Specify a 50 Hz requirement before selecting a generator so the correct model and installation can be assessed.

Does it produce 12 V electricity for the boat?

Its main output is AC power, with documented family options including 120 V and 120/240 V. The starting-battery voltage is a separate DC specification.

Does the price include a sound shield and remote panel?

The itemised quotation establishes whether those components are included. Specify the required enclosure, control panel and harness lengths.

Can it run my boat’s air conditioning?

Suitability depends on simultaneous running loads and compressor starting demand. Send the air-conditioning specifications and a complete load schedule for assessment.

Can I reuse the existing mounts and exhaust?

Potentially. Your installer should assess dimensions, condition, connection positions and compatibility before retaining them.

Request Your Cummins Onan 11.5MDKDM-8138A Quotation

For a Cummins Onan Marine QD 11.5MDKDM-8138A generator for sale, contact Marine Inboard Specialists with your vessel details, electrical requirements, load schedule and required package.

Include how soon you intend to purchase, your required delivery date, and your billing and delivery addresses. For replacements, attach photographs of the generator plate, control panel, mounting arrangement and cooling/exhaust installation.