Nanni Generator Type QMS21T

Description

New Nanni Generator Type QMS21T Marine Generator For Sale

Reliable Three-Phase Marine Power for Yachts and Professional Vessels

The New Nanni QMS21T Marine Generator is a compact, low-speed three-phase marine diesel generator designed to provide dependable onboard electricity for motor yachts, sailing yachts, cruising catamarans, workboats, passenger vessels, and other professional marine applications. Built around a proven four-cylinder Kubota diesel engine and paired with a Mecc Alte synchronous alternator, the QMS21T combines reliable mechanical engineering, stable electrical output, marine-grade cooling, and practical service access.

Designed for vessels using a 230/400V three-phase electrical system, the QMS21T provides approximately 14.3 kW or 17.9 kVA of continuous power and up to 16.7 kW or 20.9 kVA of prime power at a 0.8 power factor. It operates at 50 Hz and 1500 RPM, making it suitable for compatible pumps, refrigeration systems, air-conditioning equipment, battery chargers, water makers, ventilation systems, navigation electronics, galley equipment, and other essential onboard loads.

The QMS21T provides greater electrical capacity than the smaller QMS10T and QMS13T while retaining a compact four-cylinder design and mechanically controlled diesel platform. This makes it a practical onboard power solution for vessels that require dependable three-phase electricity without moving to a substantially larger commercial generator set.

Selecting the correct marine generator requires more than comparing model names or maximum power ratings. Continuous electrical demand, motor-starting loads, phase balance, machinery-space dimensions, cooling-water supply, ventilation, exhaust routing, expected operating hours, and future electrical upgrades should all be reviewed before purchase.

Purpose-Built Nanni QMS Marine Engineering

The New Nanni QMS21T generator range is developed specifically for marine electrical power generation. Unlike a portable or general-purpose industrial generator adapted for use aboard a vessel, the QMS21T is supplied as an integrated marine diesel generator set with dedicated cooling, exhaust, electrical, mounting, and installation features.

Nanni’s product guide identifies the QMS21T as a four-cylinder Kubota-based generator with mechanical fuel regulation, indirect injection, naturally aspirated air intake, approximately 2.2 litres of displacement, and 1500 RPM operation.

The QMS range uses Mecc Alte compact synchronous alternators. Nanni also states that most generators in the QMS family are available with an optional sound enclosure manufactured from insulated painted marine-aluminium panels, with access points for connections and maintenance.

The generator is designed for operating conditions that may include:

• Continuous vessel vibration
• High humidity
• Saltwater exposure
• Restricted machinery-space ventilation
• Changing electrical loads
• Vessel movement and inclination
• Extended operation away from shore power

Customers evaluating the New Nanni QMS21T price should consider more than the initial purchase cost. Electrical capacity, low-speed operation, installation compatibility, marine cooling, service access, acoustic options, fuel-system simplicity, and long-term parts support all contribute to the generator’s overall value.

Proven Four-Cylinder Kubota Diesel Performance

The QMS21T uses a proven Kubota diesel engine platform designed for dependable electrical generation. Kubota engines are widely used in marine, industrial, agricultural, and power-generation applications because of their durable construction, practical servicing, and established operating history.

The engine configuration includes:

• Four cylinders in line
• Four-stroke diesel operation
• Approximately 2.2-litre displacement
• Mechanical fuel regulation
• Indirect fuel injection
• Naturally aspirated air intake
• 1500 RPM rated speed

The mechanical fuel system provides a straightforward operating arrangement that may appeal to yacht owners and professional operators who value familiar diesel-maintenance procedures and reduced dependence on complex electronic fuel-management components.

Potential advantages include:

• Practical mechanical servicing
• Familiar diesel troubleshooting
• Straightforward fuel-system construction
• Reduced reliance on electronic engine controls
• Established Kubota diesel technology
• Suitability for long-range cruising and professional use

Mechanical fuel regulation does not remove the need for preventive maintenance. Clean diesel fuel, effective filtration, correct injector performance, reliable lubrication, proper cooling, and scheduled servicing remain essential for dependable operation.

A correctly sized diesel marine generator allows vessel owners to operate essential electrical systems while cruising, remaining at anchor, or working offshore without relying on marina electricity. It may also reduce the need to run the propulsion engines solely for battery charging or auxiliary power production.

Continuous and Prime Power Ratings

Understanding generator ratings is important when selecting an auxiliary marine power system.

Nanni lists the QMS21T at 16.7 kW prime power and 14.3 kW continuous power, with 230/400V three-phase output at 50 Hz.

The continuous rating is generally the more relevant figure when evaluating sustained onboard demand. Reasonable reserve capacity should remain available for equipment startup and temporary increases in electrical load.

Pumps, compressors, refrigeration systems, air-conditioning equipment, battery chargers, ventilation motors, and water makers may draw substantially more electricity during startup than during normal operation.

Selecting a generator that is too small may cause:

• Electrical overload
• Voltage instability
• Difficulty starting motors and compressors
• Excessive operating temperature
• Frequent protective shutdowns
• Reduced generator life

However, selecting a generator that is substantially larger than required may lead to prolonged operation under very light load. A professional marine electrical load assessment helps balance capacity, startup demand, efficiency, and operating reserve.

Stable Three-Phase Electrical Output

The QMS21T is designed for vessels requiring dependable 230/400V three-phase marine power. Three-phase electrical systems distribute electricity efficiently to compatible motors, pumps, compressors, refrigeration equipment, and auxiliary machinery.

The generator may support compatible equipment such as:

• Marine air-conditioning systems
• Seawater and freshwater pumps
• Refrigeration and freezer equipment
• Battery-charging systems
• Ventilation and extraction machinery
• Water-making equipment
• Navigation electronics
• Communication systems
• Vessel-monitoring equipment
• Galley machinery
• Auxiliary electric motors
• Professional marine equipment

Before installation, a qualified marine electrician should verify voltage, frequency, phase rotation, earthing, cable sizing, circuit protection, switchboard compatibility, and load distribution.

Single-phase equipment may be supplied through a properly designed three-phase distribution system. However, loads should be balanced across the phases because excessive imbalance may reduce usable generator capacity and affect voltage stability.

Dependable Electricity for Modern Vessel Systems

Modern yachts and professional vessels rely on stable electricity for navigation, communication, refrigeration, battery charging, climate control, lighting, monitoring, safety equipment, and daily onboard operations.

The Nanni QMS21T generator set is designed to provide dependable output as connected electrical demand changes. Stable voltage and frequency are particularly important aboard vessels using sensitive electronics and several motor-driven systems at the same time.

A reliable vessel power-generation system may support:

• Navigation displays
• Communication equipment
• High-capacity battery chargers
• Refrigeration controls
• Vessel-monitoring systems
• Lighting circuits
• Pumps and motor starters
• Safety and alarm equipment
• Galley appliances
• Professional operating systems

Electrical performance depends on the complete installation rather than the generator alone. Engine-speed stability, alternator regulation, cable sizing, grounding, protection settings, phase balance, and switchboard design all influence onboard power quality.

Professional installation and commissioning are therefore important for dependable long-term operation.

Marine Cooling for Sustained Operation

Reliable cooling is essential for dependable marine generator performance. Onboard generators normally operate inside enclosed machinery spaces where engine and alternator heat must be managed effectively.

Nanni describes QMS cooling as a heat-exchange arrangement between engine coolant and seawater, with a rubber-impeller seawater pump. Compatible keel-cooling installations may also be possible depending on the generator configuration and vessel. (Nanni Diesel)

A correctly maintained marine generator cooling system supports:

• Stable engine operating temperature
• Efficient heat transfer
• Reliable output under sustained loads
• Reduced thermal stress
• Protection of internal components
• Longer generator service life

Routine maintenance should include checking coolant condition, raw-water strainers, seawater flow, hoses, clamps, drive belts, pump impellers, heat-exchanger surfaces, and wet-exhaust components.

Restricted seawater flow, a damaged impeller, blocked cooling passages, or inadequate machinery-space ventilation can cause overheating even when the generator is correctly sized.

Where the generator is installed below the vessel’s waterline, the seawater and exhaust system should be evaluated for siphoning risk. A properly installed siphon break may be required depending on the vessel configuration.

Low-Speed Operation and Reduced Vibration

Nanni states that its 50 Hz QMS generator sets operate at 1500 RPM, helping reduce friction, wear, noise, and vibration compared with higher-speed generator systems. (Nanni Diesel)

Lower operating speed may contribute to:

• Smoother generator operation
• Reduced vibration transmission
• Lower mechanical wear
• Improved onboard comfort
• Dependable extended operation
• Longer equipment life with correct maintenance

A properly installed quiet marine generator should also include flexible anti-vibration mounts, effective ventilation, correctly supported hoses and cables, and a professionally designed wet-exhaust system.

Final onboard noise depends on more than the generator itself. Hull construction, mounting quality, exhaust routing, compartment insulation, and ventilation openings all influence acoustic performance.

Optional Soundshield and Installation Dimensions

The New Nanni QMS21T is available with an optional sound enclosure. Nanni states that QMS soundshield versions may achieve approximately 54 dB at seven metres under specified conditions. (Nanni Diesel)

Published dimensions for the QMS21T are approximately:

These values are listed in Nanni’s product guide and should be treated as reference measurements. Final machinery-space planning should use the approved model-specific installation drawing.

Before installation, confirm:

• Generator footprint
• Mounting-point locations
• Dry and operating weight
• Maintenance clearances
• Ventilation capacity
• Seawater connections
• Wet-exhaust routing
• Fuel supply and return
• Electrical cable access
• Lifting and removal space

When replacing an existing boat generator, matching only the electrical output is not sufficient. Voltage, frequency, phase configuration, dimensions, cooling capacity, mounting arrangements, exhaust routing, fuel compatibility, and switchboard integration should also be verified.

Applications of the Nanni QMS21T Marine Generator

Motor Yachts

The generator may support compatible air-conditioning equipment, refrigeration, water makers, battery chargers, pumps, galley systems, lighting, and navigation electronics.

Sailing Yachts and Catamarans

The QMS21T can provide dependable auxiliary marine power for refrigeration, charging systems, water pumps, navigation equipment, communications, and onboard domestic systems.

Workboats and Professional Craft

The generator may serve as a compact commercial marine generator for pumps, refrigeration, communications, ventilation, lighting, and routine operational equipment.

Passenger and Hospitality Vessels

The QMS21T may support compatible ventilation systems, refrigeration, lighting, battery charging, galley equipment, and passenger-service loads.

Marine Refit Projects

The generator may be considered when replacing an older, inefficient, or unreliable three-phase genset, provided the vessel’s electrical and installation requirements are compatible.

Technical Specifications of the Nanni QMS21T

The QMS21T is officially listed with 16.7 kW prime output, 14.3 kW continuous output, a four-cylinder Kubota engine, mechanical fuel regulation, indirect injection, naturally aspirated intake, and 1500 RPM operation.

Genuine Nanni Generator Supply and Worldwide Support

Customers looking for the New Nanni QMS21T Marine Generator for sale can contact our marine specialists for current availability, technical guidance, configuration information, and international delivery assistance.

We support customers with:

• Genuine Nanni generator supply
• Electrical-load and generator-sizing guidance
• Marine application recommendations
• Replacement-generator assessments
• Technical documentation
• Export documentation
• Worldwide shipping arrangements
• After-sales assistance

Nanni states that its products are supported through an international distributor and dealer network providing access to technical expertise and replacement parts in major marine markets.

Frequently Asked Questions

What is the New Nanni QMS21T price?

The New Nanni QMS21T price depends on current availability, soundshield selection, optional equipment, shipping destination, export requirements, and delivery arrangements. Contact our team for an updated quotation.

How much power does the QMS21T produce?

It provides approximately 14.3 kW or 17.9 kVA of continuous power and up to 16.7 kW or 20.9 kVA of prime power.

Is the QMS21T a three-phase generator?

Yes. It provides 230/400V three-phase marine power at 50 Hz with a 0.8 power factor.

What engine does it use?

The generator uses a four-cylinder Kubota diesel engine with approximately 2.2 litres of displacement, mechanical fuel regulation, indirect injection, naturally aspirated air intake, and 1500 RPM operation.

Is a sound enclosure available?

Yes. The QMS21T is listed with an optional soundshield configuration.

Can it replace an existing marine generator?

Yes. It may be suitable for a marine generator replacement when output, voltage, frequency, phase configuration, dimensions, mounting, cooling, exhaust, fuel, and switchboard requirements are compatible.

Request a Quote for the Nanni QMS21T Marine Generator

The New Nanni QMS21T Marine Generator is a dependable choice for yacht owners, boat builders, shipyards, marine installers, and professional operators requiring reliable three-phase marine power from a low-speed Kubota diesel platform.

Contact our marine generator specialists to request the latest Nanni QMS21T price, confirm availability, review installation requirements, and receive assistance selecting the correct generator configuration for your vessel.