Nanni Generator Type Q6800 – 100ST50

Description

New Nanni Generator Type Q6800 – 100ST50 Marine Generator For Sale

High-Capacity Soundless Power for Superyachts and Professional Vessels

The New Nanni Q6800 100ST50 Marine Generator is a high-capacity three-phase marine diesel generator developed for superyachts, expedition vessels, passenger craft, naval applications, offshore-support vessels, and demanding commercial marine operations. Built around a six-cylinder John Deere diesel engine and paired with a Leroy-Somer alternator, the New Nanni Q6800 100ST50 combines substantial electrical capacity, electronic engine management, advanced generator monitoring, and a sound-attenuated marine enclosure.

Designed for vessels using a 230/400V three-phase electrical system, the generator provides 98.4 kW of prime running power and up to 108 kW of limited-time power at 50 Hz. Its substantial capacity allows it to support compatible air-conditioning plants, refrigeration equipment, pumps, hydraulic systems, water makers, ventilation machinery, battery chargers, commercial galley appliances, workshop equipment, and other high-demand onboard loads.

The “ST” designation identifies the model as the sound-attenuated version of the Q6800 platform. For vessel owners and operators who require substantial onboard electrical power without compromising passenger comfort, the Q6800 – 100ST50 offers a capable solution for extended marine operation.

Selecting the correct marine generator requires more than comparing maximum output figures. Continuous electrical demand, equipment starting loads, phase balance, machinery-space dimensions, cooling-water supply, ventilation, exhaust routing, fuel capacity, and future electrical upgrades should all be evaluated before purchase.

Purpose-Built Nanni Q6800 Marine Engineering

The Nanni Q6800 marine generator is engineered as a complete marine power package rather than a standard industrial generator adapted for vessel use. Its engine, alternator, heat exchanger, raw-water circuit, wet exhaust, digital controls, protection systems, and acoustic enclosure are configured around demanding onboard conditions.

The generator uses a 6.8-litre, six-cylinder, four-stroke John Deere diesel engine with turbocharging, coolant aftercooling, high-pressure common-rail fuel injection, automatic preheating, and electronic governing. It operates at 1500 RPM to produce stable 50 Hz electricity.

The low-speed configuration helps reduce mechanical wear and vibration compared with many higher-speed generator systems. Electronic regulation maintains consistent engine speed as connected electrical demand changes, helping the alternator deliver stable frequency.

Customers evaluating the Nanni Generator Type Q6800 – 100ST50 price should consider the generator’s complete operating value, including its prime power capacity, acoustic configuration, fuel efficiency, installation requirements, marine cooling, service accessibility, and long-term support.

Six-Cylinder John Deere Diesel Performance

The Q6800 – 100ST50 uses a heavy-duty John Deere engine platform designed for sustained electrical generation. Its engine specification includes:

• Six cylinders in line
• Four-stroke diesel operation
• 6,800 cm³ displacement
• Turbocharged and coolant-aftercooled air intake
• High-pressure common-rail injection
• Electronic speed governing
• Automatic preheating
• 1500 RPM operation at 50 Hz

The engine uses 10-micron primary and 2-micron secondary fuel filtration. It is rated for continuous operation at vessel angles up to 25 degrees and intermittent operation up to 35 degrees, reflecting its adaptation to marine service.

A correctly sized diesel marine generator allows vessel operators to maintain essential electrical services without depending on shore power or running the main propulsion engines solely for auxiliary electricity.

Prime and Limited-Time Power Ratings

Understanding generator classifications is essential when planning a marine auxiliary power system.

Prime running power is the more relevant rating for sustained vessel operation. New Nanni Q6800 100ST50 specifies unrestricted running time under its published prime-power conditions, including limits on annual full-load hours and load variation. Limited-time power applies to non-variable-load operation for a restricted number of annual hours.

The vessel’s normal electrical demand should remain below the prime rating, leaving sufficient reserve for temporary load increases. Pumps, compressors, air-conditioning plants, refrigeration systems, hydraulic power units, and water makers can draw considerably more current during startup than during normal operation.

An undersized generator may experience overload, unstable voltage, overheating, and shortened service life. An excessively oversized unit may operate for long periods under very light load. A professional marine electrical load assessment helps balance capacity, operating reserve, and efficiency.

Stable Three-Phase Electrical Output

The Q6800 – 100ST50 uses a Leroy-Somer LSAM 44.3 M8 alternator with Class H insulation, IP23 protection, and voltage regulation of approximately ±0.5%. These characteristics support dependable power for compatible onboard systems and sensitive electrical equipment.

This three-phase marine generator may support:

• Central marine air-conditioning systems
• Seawater and freshwater pumps
• Refrigeration and cold-storage plants
• Ventilation and extraction machinery
• Hydraulic power packs
• Water-making equipment
• Battery-charging systems
• Commercial galley machinery
• Workshop tools
• Navigation and communication systems
• Passenger-comfort equipment

Single-phase loads may be supplied through a correctly designed three-phase distribution system, but they should be balanced carefully across the phases. A qualified marine electrician should verify voltage, phase rotation, cable sizing, circuit protection, grounding, and switchboard compatibility.

Fuel Consumption Under Different Loads

Nanni publishes fuel-consumption figures across several operating loads:

Actual consumption may vary according to electrical demand, engine condition, fuel quality, ventilation, maintenance, and installation.

Correct generator sizing can improve operating efficiency. The objective is to provide sufficient reserve for transient loads without routinely operating the diesel engine far below its practical working range.

Marine Cooling for Extended Operation

Reliable cooling is fundamental to marine generator performance. The Q6800 uses engine-coolant aftercooling, a belt-driven centrifugal coolant pump, a freshwater-cooled exhaust manifold, and a bronze seawater pump with a neoprene rotor.

Nanni lists seawater-pump flow at approximately 163 litres per minute for the 50 Hz model.

A properly maintained marine generator cooling system supports:

• Stable operating temperature
• Reliable performance under sustained load
• Reduced thermal stress
• Protection of internal components
• Consistent offshore operation
• Longer service life

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

Where the generator is installed below the vessel’s waterline, Nanni states that a siphon break is mandatory to prevent seawater from siphoning into the engine through the exhaust line.

SI-2 Digital Control and Generator Protection

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

Its functions include:

• Start and stop controls
• Engine-parameter display
• Generator-parameter display
• Generator-status indication
• Alerts and fault-code display
• Remote monitoring capability
• True RMS electrical measurement
• RS485 communication
• User-adjustable protections
• Detailed operating-history records

The advanced SI-2 controller supports standby and prime-power operation and stores up to 350 detailed history records.

These features help operators identify abnormal conditions before minor issues become serious failures. Digital monitoring strengthens daily supervision but does not replace scheduled inspection and preventive maintenance.

Soundshield Design and Installation Dimensions

The Q6800 – 100ST50 is the sound-attenuated configuration. Its enclosure is designed to reduce transmitted noise while allowing access to internal components and service points.

The enclosure includes accessible connections for the battery, grounding, fuel supply and return, seawater inlet, water-cooled exhaust, power cables, circuit breaker, control panel, and emergency stop.

A properly installed quiet marine generator should also include suitable flexible mounts, effective machinery-space ventilation, supported hoses and cables, a correctly engineered wet-exhaust system, and adequate maintenance clearance.

Nanni notes that published drawings are for reference and should not replace approved installation drawings when planning the machinery space.

Applications of the Nanni Q6800 – 100ST50

The generator may be suitable for:

• Superyachts and large motor yachts
• Expedition and long-range cruising vessels
• Passenger and hospitality vessels
• Commercial workboats
• Offshore-support craft
• Naval and government vessels
• Large yacht refit projects
• High-capacity generator replacement

As a commercial marine generator, it can support pumps, hydraulic systems, refrigeration plants, workshop machinery, ventilation equipment, charging systems, and other operational loads.

When considering the Q6800 – 100ST50 as a marine generator replacement, confirm the vessel’s voltage, phase, prime demand, installation dimensions, lifting access, fuel system, cooling-water supply, exhaust back pressure, ventilation, and switchboard compatibility.

Technical Specifications of the Nanni Q6800 – 100ST50

The New Nanni Q6800 100ST50 is also HVO-compatible and uses a John Deere engine identified by Nanni as EPA Tier III. Nanni further states that the engine is exempt from IMO MARPOL Annex VI requirements applicable at or above 130 kW, so SCR is not required for this model. (Nanni Industries)

Standard Equipment and Available Options

Standard equipment includes:

• Six-cylinder John Deere diesel engine
• Leroy-Somer three-phase alternator
• SI-2 digital control panel
• 24V bipolar electrical system
• Marine heat exchanger
• Raw-water pump
• Wet-exhaust arrangement
• Main-parameter safeguards
• Electrical isolation
• Preparation for a paralleling system
• Soundshield enclosure

Available options include:

• Siphon break
• Fuel pre-filter
• Fuel-water separator
• Raw-water filtration accessories

Customers looking for the New Nanni Generator Type Q6800 – 100ST50 Marine Generator for sale can contact our specialists for current availability, approved technical drawings, configuration guidance, and worldwide delivery assistance.

Frequently Asked Questions

What is the New Nanni Q6800 100ST50 price?

The Nanni Generator Type Q6800 – 100ST50 price depends on configuration, optional equipment, availability, shipping destination, and export requirements. Contact our team for an updated quotation.

How much power does the generator provide?

It produces 98.4 kW of prime running power and up to 108 kW of limited-time power.

Is it a three-phase generator?

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

What engine does it use?

It uses a turbocharged and aftercooled six-cylinder John Deere diesel engine with 6.8 litres of displacement and electronic common-rail fuel management.

Is a sound enclosure included?

The 100ST50 designation represents the soundshield configuration. An unenclosed 100WT50 version is also listed by Nanni.

Request a Quote for the Nanni Q6800 – 100ST50

The New Nanni Generator Type Q6800 – 100ST50 Marine Generator is a capable choice for superyacht owners, shipyards, vessel managers, and professional operators requiring high-capacity three-phase marine power with reliable diesel engineering and improved acoustic performance.

Contact our marine generator specialists to request the latest New Nanni Q6800 100ST50 price, confirm availability, review installation requirements, and select the correct generator configuration for your vessel.