Phasor K4-21.0kW Marine Diesel Generator – 1800 RPM, Standard Series
During prolonged luxury motor yacht passages, the Phasor K4-21.0kW Marine Generator excels, providing 21kW of heavy-duty 1800 RPM electrical output from an industrial Kubota 4-cylinder diesel engine for commercial vessels.
- 21kW output powers entire vessel grids
- Kubota 4-cylinder diesel sustains continuous loads
- 1800 RPM speed maximizes engine lifespan
- Water-cooled manifold keeps engine rooms cool
- Digital control board monitors critical alarms
Description
During long commercial offshore fishing transits, the Phasor K4-21.0kW Marine Diesel Generator delivers uninterrupted prime electrical power to sustain blast freezers, seawater brine pumps, and deck cranes. Generating 21.0 kW continuous output and 25.0 kVA surge rating at 120V and 240V 60Hz, this plant powers full shipboard operations across continuous multi-week fishing expeditions.
A four-cylinder 2197cc Kubota V2203 diesel engine drives a heavy-duty four-pole synchronous alternator, resting on a rigid steel channel base with heavy captive isolation mounts. Stator assemblies use 100 percent copper wire insulated to Class H specifications to eliminate heat degradation. Weighing 780 lbs dry, the generator chassis perimeter measures 44.0 inches long by 24.0 inches wide by 28.5 inches high.
Key Features of Phasor K4-21.0kW
Commercial skippers who buy Phasor K4-21.0kW marine diesel generator hardware gain industrial commercial power equipment built to handle severe maritime workloads. Operating at 1800 RPM minimizes mechanical stress on engine components, ensuring continuous electrical output during stormy sea voyages.
- 21.0 kW continuous prime electrical capacity energizes heavy commercial kitchen cooktops and blast freezers.
- 25.0 kVA surge capacity starts high-torque three-phase seawater cooling pumps without nuisance breaker trips.
- Low-speed 1800 RPM engine operation extends overhaul intervals and lowers mechanical noise levels.
- Kubota four-cylinder diesel block provides smooth mechanical balance and low rotational vibration.
- K4-21.0kW standard series genset incorporates a cupronickel heat exchanger that resists saltwater corrosion.
- Brushless revolving-field alternator eliminates carbon brush replacement chores and electrical sparking.
- Captive rubber isolation mounts prevent heavy engine torque pulses from vibrating vessel hull stringers.
- Emergency automatic shutdown sensors stop fuel delivery upon high engine coolant temperature or low oil pressure.
Dynamic Step Load Transient Tolerances
Operating inside an optional acoustic capsule, this generator emits 58 dB(A) at 23 feet, allowing quiet vessel operation at dock or anchor. An electronic automatic voltage regulator limits output voltage variance within 1.5 percent of nominal ratings at 60 Hz, stabilizing line voltage when large induction motors cycle on. The four-cylinder diesel engine burns 1.35 GPH at 50 percent load, providing high operational efficiency.
Hull Bed Fitment Exhaust Configuration
Secure the heavy steel base to structural engine beds using high-tensile marine mounting bolts, leaving 16 inches of perimeter service clearance. Plumb wet exhaust lines through a large-capacity waterlock muffler with an overboard discharge loop. The isolated DC electrical return blocks galvanic stray current corrosion across expensive bronze propulsion hardware.
Routine Handling Mechanical Service Rules
Centralized service points allow mechanics to perform filter changes and fluid inspections from one side of the engine. This high-capacity generator is not engineered for land-based operations without cooling water, nor for direct electrical integration with uninsulated shore lines lacking marine galvanic isolation switches.
- Inspect sea strainer baskets and raw-water pump drive belts before each shift.
- Change engine lubricating oil and replace fuel filter elements every 100 runtime hours.
- Inspect raw-water pump impeller condition and clean air filters every 250 runtime hours.
Warranty Statement Shipping Carton Contents
Phasor covers this industrial marine generator with a 2-Year commercial warranty covering engine mechanicals, stator coils, and electrical switchgear. The shipping crate delivers the Phasor K4-21.0kW generator core, remote digital start panel, external electric fuel pump, anti-vibration mount set, and operator manual.
Phasor K4-21.0kW Marine Diesel Generator (Standard Series, 1800 RPM) Specs
| Brand / Manufacturer | Phasor Marine Power Systems |
| Full Model Code | K4-21.0 kW Standard Heat Exchanger Series |
| Generator Type | Stationary Single/Three-Phase Marine Diesel Generator Set |
| Prime Power Output | 21.0 kW (21,000 Continuous Watts) |
| AC Voltage Options | 120/240V Single Phase | 120/208V, 277/480V Three-Phase Configurations @ 60 Hz |
| Amperage Output (Single Phase) | 175.0A @ 120V / 87.5A @ 240V |
| Engine Architecture | Kubota V2203 Series Naturally Aspirated 4-Cylinder Marine Diesel Engine |
| Engine Operational Speed | Static 1,800 RPM (Low Speed, High-Longevity Commercial Baseline) |
| Cooling System Type | Cupro-Nickel Heat Exchanger Cooled with Water-Cooled Exhaust Manifold Grid |
| Alternator Spec Core | Single Bearing Brushless Synchronous Generator with Solid-State AVR (±1% Regulation) |
| Starting System | 12V DC Electric Starter Motor with Marine-Grade Tinned Wiring Harness |
| Safety Management Systems | Automatic Engine Shutdown Overrides (Low Lube Oil Pressure / High Coolant Temperature) |
| Chassis & Structural Mount | Rigid Welded Steel Mounting Rail Base with Multi-Point Heavy Elastomeric Vibration Isolators |
| Net Weight | Approx. 356.0 kg (785.0 lbs) Base Dry Weight Class |
| Dimensions L x W x H | 1041 mm x 584 mm x 686 mm (41.0" x 23.0" x 27.0") |
| Ideal Application | Excellent primary or auxiliary power tracking for large sportfishers, motor yachts, and light commercial vessels requiring quiet, smooth 4-cylinder power. |














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