Nanni Generator Type Q6800 – 125ST50

Description

New Nanni Generator Type Q6800 – 125ST50 Marine Generator For Sale

High-Capacity Soundless Marine Power for Superyachts and Commercial Vessels

The New Nanni Q6800 125ST50 Marine Generator is a high-capacity three-phase marine diesel generator engineered for superyachts, expedition vessels, passenger craft, offshore-support vessels, commercial workboats, and other demanding professional marine applications. Built around a proven six-cylinder John Deere diesel engine and paired with a Leroy-Somer alternator, the Q6800 – 125ST50 combines substantial electrical output, electronic engine management, advanced generator controls, marine-grade cooling, and a sound-attenuated enclosure. New Nanni Q6800 125ST50

Designed for vessels using a 230/400V three-phase electrical system, the New Nanni Q6800 125ST50 provides approximately 123 kW of prime running power and up to 132 kW of limited-time power at 50 Hz. This substantial capacity makes it suitable for operating central marine air-conditioning systems, refrigeration plants, seawater pumps, hydraulic power units, water makers, ventilation systems, battery chargers, commercial galley equipment, workshop machinery, and other high-demand onboard electrical loads. (Nanni Industries)

The “ST” designation identifies the model as a Soundless three-phase marine generator. Its soundshield is designed to reduce airborne machinery noise and improve onboard comfort while maintaining access to important service components.

For vessel owners, shipyards, boat builders, and commercial operators requiring dependable onboard electrical power, the New Nanni Q6800 125ST50 provides a strong balance of electrical capacity, low-speed diesel operation, acoustic performance, and purpose-built marine engineering.

Selecting the correct marine generator involves more than comparing maximum kilowatt ratings. Continuous electrical demand, motor-starting loads, phase balance, machinery-space dimensions, ventilation, seawater supply, exhaust routing, fuel capacity, operating hours, and future electrical upgrades should all be considered before installation.

Purpose-Built Nanni Q6800 Marine Engineering

The Nanni Q6800 marine generator is engineered as a complete marine power package rather than a conventional industrial generator adapted for installation aboard a vessel. Its diesel engine, alternator, heat exchanger, raw-water circuit, wet-exhaust arrangement, digital controls, electrical protection, mounting system, and acoustic enclosure are designed around demanding marine operating conditions.

The generator is developed to perform in environments affected by:

• Continuous vibration
• High humidity
• Saltwater exposure
• Restricted machinery-space ventilation
• Changing electrical loads
• Vessel movement and inclination
• Extended operating periods

The Q6800 platform uses a 6.8-litre, six-cylinder, four-stroke John Deere diesel engine. The engine features turbocharging, charge-air cooling, high-pressure common-rail fuel injection, electronic speed regulation, and automatic preheating. It operates at 1500 RPM to produce stable 50 Hz electricity. (Nanni Industries)

Low-speed operation helps reduce mechanical wear, vibration, and operating noise compared with many higher-speed generator systems. Electronic engine governing helps maintain consistent rotational speed as connected electrical demand rises or falls, supporting stable generator frequency.

Customers evaluating the Nanni Generator Type Q6800 – 125ST50 price should consider more than the initial purchase cost. Electrical capacity, fuel consumption, acoustic performance, marine durability, installation compatibility, service accessibility, digital monitoring, and long-term technical support all contribute to the generator’s overall operating value.

Heavy-Duty Six-Cylinder John Deere Diesel Performance

The Q6800 – 125ST50 uses a robust John Deere engine platform designed for sustained electrical generation. Its six-cylinder configuration provides the power required for high-capacity marine electrical systems while maintaining smooth operation and dependable performance under changing loads.

The engine configuration includes:

• Six cylinders in line
• Four-stroke diesel operation
• Approximately 6.8 litres of displacement
• Turbocharged air intake
• Air-to-coolant aftercooling
• High-pressure common-rail fuel injection
• Electronic engine-speed regulation
• Automatic engine preheating
• 1500 RPM operation at 50 Hz

The generator is designed to provide:

• Reliable electricity for high-demand onboard systems
• Stable performance under changing electrical loads
• Efficient power generation at appropriate operating loads
• Reduced mechanical stress through low-speed operation
• Practical access for scheduled maintenance
• Dependable auxiliary power away from shore facilities

A correctly sized diesel marine generator allows vessel owners and professional operators to maintain essential electrical services while cruising, remaining at anchor, or operating offshore without depending on marina electricity.

It can also reduce the need to operate the vessel’s main propulsion engines solely for battery charging or auxiliary electrical production.

Prime and Limited-Time Power Ratings

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

The Nanni Q6800 – 125ST50 provides:

The prime running power rating is the more relevant figure when calculating sustained onboard electrical demand. Limited-time power provides additional capacity under defined operating conditions and should not be treated as the generator’s normal continuous output. (Nanni Industries)

The vessel’s normal electrical load should generally remain below the prime rating, leaving appropriate reserve capacity for temporary increases in demand and equipment startup requirements.

Equipment such as air-conditioning compressors, refrigeration systems, pumps, hydraulic machinery, water makers, ventilation motors, and workshop equipment may require considerably more electricity during startup than during normal operation.

An undersized generator may experience:

• Electrical overload
• Voltage instability
• Excessive operating temperatures
• Difficulty starting large motors
• Frequent protective shutdowns
• Reduced generator service life

However, selecting a generator that is substantially larger than required may lead to extended operation under very light loads. A professional marine electrical load assessment helps balance generator capacity, startup requirements, operating reserve, fuel efficiency, and long-term engine performance.

Stable Three-Phase Electrical Output

The New Nanni Q6800 125ST50 is designed for vessels requiring dependable three-phase marine power. Three-phase systems are commonly used aboard large yachts and commercial vessels because they distribute electrical power efficiently to compatible motors, pumps, compressors, and heavy auxiliary machinery.

The generator may support compatible equipment such as:

• Central marine air-conditioning systems
• Seawater and freshwater pumps
• Refrigeration and freezer plants
• Ventilation and extraction equipment
• Hydraulic power units
• Water-making systems
• High-capacity battery chargers
• Commercial galley equipment
• Workshop machinery
• Auxiliary electric motors
• Navigation and communication systems
• Passenger-comfort equipment

The generator uses a Leroy-Somer alternator designed to provide dependable electrical output under changing vessel loads. The 125ST50 operates at 230/400V, three phase, 50 Hz, with a 0.8 power factor. (Nanni Industries)

Before installation, a qualified marine electrician should verify:

• Generator voltage
• Electrical frequency
• Phase rotation
• Earthing and bonding arrangements
• Cable sizes
• Circuit protection
• Switchboard compatibility
• Load distribution
• Generator paralleling requirements

Single-phase equipment may be supplied through a correctly engineered three-phase distribution system. However, loads should be balanced appropriately across the phases because excessive imbalance may affect voltage stability and available generator capacity.

Fuel Consumption and Operating Efficiency

Fuel consumption is an important consideration for vessels operating high-capacity generators for extended periods.

Nanni’s current product guide lists approximate fuel consumption of 36.2 litres per hour for the Q6800 – 125ST50. Actual consumption may vary according to electrical load, engine condition, maintenance history, fuel quality, ambient temperature, machinery-space ventilation, and installation conditions. (Nanni Industries)

Fuel planning should consider:

• Expected generator operating hours
• Average electrical demand
• Simultaneous equipment use
• Fuel-tank capacity
• Vessel operating range
• Required fuel reserves
• Planned maintenance intervals

A generator operating at reduced demand will generally consume less fuel than one operating close to maximum capacity. However, prolonged operation under extremely light loads should be avoided where practical because diesel engines generally perform best when regularly operated under a meaningful working load.

Correct generator sizing helps improve operating efficiency while maintaining sufficient reserve capacity for temporary electrical demand.

Soundless Technology for Improved Onboard Comfort

Noise and vibration are important considerations aboard superyachts, expedition vessels, passenger craft, hospitality vessels, and liveaboard boats. Generator noise can affect guest cabins, crew accommodation, lounges, dining areas, working spaces, and other occupied sections of the vessel.

The Q6800 – 125ST50 belongs to Nanni’s Soundless marine generator range. Its acoustic enclosure is designed to reduce airborne engine noise, alternator noise, and machinery-space sound transmission while preserving practical access for routine inspection and maintenance.

The soundshield is designed to help reduce:

• Airborne diesel-engine noise
• Alternator operating noise
• Mechanical generator noise
• Machinery-space sound transmission
• Vibration reaching the vessel structure

The generator’s 1500 RPM operating speed also supports smoother and quieter performance than many higher-speed generator designs.

A correctly installed quiet marine generator should include:

• Properly selected flexible mounts
• Effective machinery-space ventilation
• Correctly supported hoses and electrical cables
• A professionally engineered wet-exhaust system
• Suitable compartment insulation
• Adequate maintenance clearances

The soundshield alone does not determine the final onboard noise level. Hull construction, mounting quality, exhaust design, ventilation openings, and vibration transfer through the vessel structure also influence acoustic performance.

Marine Cooling for Extended Operation

Reliable cooling is essential for dependable marine generator performance. Unlike land-based generators operating in open surroundings, marine generator sets are normally installed inside enclosed machinery spaces where heat must be removed efficiently.

The Q6800 uses a dedicated marine generator cooling system designed to maintain stable engine temperature during prolonged operation. Its marine configuration includes a closed coolant circuit, heat exchanger, raw-water pump, freshwater-cooled exhaust manifold, and wet-exhaust arrangement.

A properly maintained cooling system supports:

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

Routine maintenance should include inspection of:

• Engine coolant condition
• Raw-water strainers
• Seawater flow
• Cooling hoses and clamps
• Drive belts
• Raw-water pump impellers
• Heat-exchanger components
• Wet-exhaust connections

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

Where the generator is installed below the vessel’s waterline, an appropriately installed siphon break may be required to reduce the risk of seawater entering the engine through the exhaust system.

SI-2 Digital Generator Control and Monitoring

The Q6800 platform uses Nanni’s SI-2 digital control panel for generator operation, monitoring, and fault identification.

The control system provides:

• Generator start and stop controls
• Engine-parameter monitoring
• Generator-parameter monitoring
• Generator-status information
• Warning and fault-code displays
• Operating-history records
• Multilingual menu support
• Remote monitoring capability

The advanced SI-2 system supports generator supervision during prime-power and standby applications. It allows operators to monitor important operating information and identify abnormal conditions before minor issues develop into more serious failures. (Nanni Industries)

Digital monitoring does not replace routine inspection and preventive maintenance. Coolant levels, engine oil, fuel filters, seawater flow, hoses, belts, electrical connections, and exhaust components should still be checked according to the approved maintenance schedule.

Soundshield Dimensions and Marine Installation

The Q6800 – 125ST50 is designed as a high-capacity soundshield generator package.

Nanni lists the following approximate dimensions and weight:

The equivalent version without a soundshield measures approximately 1940 × 890 × 1028 mm and has a dry weight of approximately 1485 kg. (Nanni Industries)

Before installation, the approved technical drawing should be reviewed to confirm:

• Overall generator dimensions
• Dry and operational weight
• Mounting-point locations
• Machinery-space access
• Maintenance clearances
• Ventilation requirements
• Seawater connections
• Exhaust routing
• Fuel supply and return connections
• Electrical cable access
• Lifting arrangements
• Future generator-removal requirements

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

Applications of the Nanni Q6800 – 125ST50

Superyachts and Large Motor Yachts

The generator can provide substantial electrical capacity for central air conditioning, refrigeration plants, water makers, high-capacity battery chargers, electric galley systems, pumps, entertainment equipment, lighting, and guest-comfort systems.

Expedition and Long-Range Vessels

The Q6800 – 125ST50 may support vessels requiring dependable auxiliary electricity during extended voyages away from shore facilities.

Passenger and Hospitality Vessels

Its high electrical capacity and sound-attenuated design make it suitable for compatible passenger-comfort systems, refrigeration, ventilation, lighting, commercial catering equipment, and other hospitality-related loads.

Commercial Workboats

The generator can serve as a dependable commercial marine generator for hydraulic systems, pumps, refrigeration equipment, workshop machinery, communication systems, and operational loads.

Offshore-Support Vessels

Its substantial three-phase output may support compatible deck equipment, auxiliary machinery, pumps, communications, and professional onboard systems.

Marine Refit Projects

The New Nanni Q6800 125ST50 may be considered when replacing an ageing, inefficient, undersized, or noisy generator, provided the vessel’s electrical and installation requirements are compatible.

Technical Specifications of the Nanni Q6800 – 125ST50

The Q6800 – 125ST50 is officially rated at 123 kW prime power and 132 kW limited-time power, with 230/400V three-phase output at 50 Hz. (Nanni Industries)

Standard Marine Equipment and Available Options

The Nanni Q6800 – 125ST50 is supplied as an integrated marine diesel generator set designed for dependable onboard installation.

Standard equipment includes:

• Six-cylinder John Deere diesel engine
• Leroy-Somer three-phase alternator
• Electronic engine-speed regulation
• SI-2 digital control panel
• 24V bipolar electrical system
• Marine heat exchanger
• Raw-water pump with neoprene rotor
• Marine wet-exhaust system
• Main operating-parameter safeguards
• Electrical isolation
• Preparation for a generator paralleling system
• Soundshield enclosure

Available options may include:

• Siphon-break equipment
• Fuel pre-filter
• Fuel-water separator
• Raw-water filtration accessories
• Additional marine installation equipment

The final equipment package should be confirmed before ordering because production specifications, regional configurations, and vessel requirements may vary. (Nanni Industries)

Genuine Nanni Generator Supply and Worldwide Support

Customers looking for the New Nanni Generator Type Q6800 – 125ST50 Marine Generator for sale can contact our marine specialists for current availability, technical guidance, approved installation drawings, configuration information, and international delivery assistance.

We support customers with:

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

Whether you are completing a superyacht refit project, upgrading a commercial vessel, or installing a new high-capacity marine power system, selecting the correct generator configuration can reduce installation problems and improve long-term operating reliability.

Frequently Asked Questions

What is the New Nanni Q6800 125ST50 price?

The Nanni Generator Type Q6800 – 125ST50 price depends on current availability, selected equipment, shipping destination, export requirements, and delivery arrangements. Contact our team for an updated quotation.

How much power does the Q6800 – 125ST50 provide?

The generator provides approximately 123 kW of prime running power and up to 132 kW of limited-time power. (Nanni Industries)

Is the Q6800 – 125ST50 a three-phase generator?

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

What engine is used in the Q6800 – 125ST50?

The generator uses a six-cylinder John Deere diesel engine with approximately 6.8 litres of displacement, turbocharging, aftercooling, common-rail fuel injection, and electronic speed regulation. (Nanni Industries)

What does the “ST” designation mean?

The “S” identifies the generator as a Soundless model with a sound-attenuated enclosure, while the “T” identifies its three-phase electrical configuration.

Is the Q6800 – 125ST50 suitable for superyachts?

Yes. Its substantial electrical capacity and soundshield configuration make it suitable for compatible superyachts, expedition vessels, passenger craft, offshore-support vessels, and professional marine applications.

Can it support commercial marine equipment?

Yes, provided the connected equipment is electrically compatible and the combined continuous and startup loads remain within the generator’s approved capacity.

Can it replace an existing marine generator?

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

Is worldwide shipping available?

Yes. We support customers with international marine generator supply, export documentation, and worldwide shipping arrangements.

Request a Quote for the Nanni Q6800 – 125ST50 Marine Generator

The New Nanni Q6800 125ST50 Marine Generator is a capable choice for superyacht owners, shipyards, boat builders, vessel managers, and professional operators requiring high-capacity three-phase marine power with dependable diesel engineering and enhanced acoustic performance.

Contact our marine generator specialists to request the latest New Nanni Q6800 125ST50 price, confirm current availability, review installation requirements, and receive assistance selecting the correct generator configuration for your vessel.