Generators

Single-phase/three-phase synchronous AC generators ST/STC series

Our ST/STC series single-phase and three-phase A.C. synchronous generators are engineered to deliver reliable power wherever you need it. Recognized with a national gold medal for quality, these generators are perfect for marine vessels, workshops, homes, and rural electrification.

Key Features:

Versatile Applications:

Ideal as a power source for ships, industrial sites, and household backup.

High-Quality Construction:

Built with premium electrical and magnetic materials for maximum durability and performance.

Drip-Proof Design:

Suitable for harsh environments, ensuring safe and continuous operation.

Stable Voltage Output:

Advanced harmonic wave self-excitation and automatic voltage control systems keep your power supply consistent.

International Compliance:

Manufactured to IEC standards, compatible with requirements in Australia, Europe, America, and more.

Easy to Install & Maintain:

Lightweight, elegant design with class B stator insulation for longevity and safety.

Available Models:

Choose from single-phase or three-phase models to match your specific needs.

Technical Specifications:

Output range: [Insert kW/kVA range]
Voltage: [Insert voltage options]
Frequency: [50Hz/60Hz]
Insulation class: B
Protection: Drip-proof

Frequently Asked Questions

What is the difference between single-phase and three-phase generators?

Single-phase generators are ideal for smaller loads and residential use, while three-phase generators are suited for larger, industrial, or commercial applications.

Are these generators suitable for marine environments?

Yes, the ST/STC series is designed for marine use, with drip-proof construction and reliable performance at sea.

Marine Sleeper Generators

Sleeper marine's Variable Speed Variable Speed Turbine Generators use variable speed technology that can automatically adjust engine speeds according to the electrical load. Traditional generators typically run at a fixed 1500/3000 rpm which leads to engine inefficiency. By automatically adjusting the engine speed according to the electrical load, Sleeper generators become more energy-saving, environmentally friendly, efficient and extremely quiet compared to our competitors, meanwhile extending the maintenance time and engine life.

World-renowned Yanmar water-cooled motors ensure product reliability.Water-cooled permanent magnet alternator.Extremely quiet - Patented structural design and sound shield with special materials effectively reduce noise and vibration.Small size and light weight are more suitable for marine compact installation.Environmentally friendly - Inverter technology saves fuel by about 30%

Marine generator 5 kW

The Sleeper Marine 5 kW marine generator (Model H-MG6i) combines a Yanmar water-cooled engine (model SP12) with a permanent magnet water-cooled alternator (PMG 6) and variable speed inverter technology (2600-3200 rpm).

It offers stable, "clean" power for sensitive electronics, up to ~30% fuel savings, low fuel consumption (0.8-2 L/h) and extremely compact dimensions (450×450×560 mm) with a weight of just 93 kg - ideal for sailboats, small catamarans and boats where space and noise are critical factors.

SLEEPER 5kW Marine Generator Specification

Generator
Model H-MG6i
Dimensions（LxWxH)(mm) 450 x 450 x 560
Net weight(Kg) 93
Noise(dBa/7m) 55
Cooling system Dual circuit freshwater cooling via a heat exchanger

Performance
Frequency(Hz) 50 / 60
Output Voltage(V) 230 /120
Voltage stability ≤3%
Frequency Stability ±0.1%
Max power (kW) 5.5
Continuous power(kW) 5
Voltage regulation Electronic
Frequency regulation Electronic

Control
Start system 12VDC
Auto start Integrated
Control panel Digital display control（DDC local + DDC remote）
Inverter (with DDC local) PMG 6
Inverter weight (Kg) 13
Inverter dimensions（mm） 345 x 234 x170

Engine
Engine brand YANMAR
Engine model SP12
Cylinder 1 cylinder
Displacement(cc) 499
Speed(rpm) 2600-3200
Fuel Diesel
Consumption（L/hr） 0.8-2
Oil capacity(L) 1.65

Marine generator 10 kW

Sleeper Marine 10 kW marine generator (Model M-GV12 / H-MGV12) with water cooled Yanmar 3TNV76 engine and water cooled permanent magnet alternator (PMG). Variable speed technology (2000-2600 rpm) & inverter for up to ~30% fuel savings, ultra quiet operation 54 dB @7m, lightweight and compact design ideal for boats with limited space.

SLEEPER 10kW Marine Generator Specification

Generators
Model M-GV12
Dimensions (LxWxH)(mm) 800×560×630
Net weight(Kg) 218
Noise(dBa/7m) 54
Cooling System Seawater heat exchange

Performance parameters
Frequency (Hz) 50 / 60
Voltage (V) 230 /120
Voltage stability ≤3%
Frequency stability ± 0.1 %
Peak output (kW) 11
Continuous output (kW) 10
Voltage regulation Electronic regulation
Frequency regulation Electronic regulation

Control systems
Start-up systems 12VDC
Automatic start Integrated
Control panel LCD digital display control (local + remote dual panel control)
Inverter (with panel) PMG 12
Inverter weight (Kg) 17.5
Inverter dimensions (mm) 463 x 234 x 180

Engines
Engine Brand YANMAR
Engine model 3TNV76
Number of cylinders Three cylinders
Displacement(cc) 1116
Speed(rpm) 2000-2600
Fuel Diesel
Fuel consumption (L/hr) 1.2-3.5
Oil capacity (L) 4.4

Marine generator 15 kW

Sleeper Marine 15 kW marine generator (Model M-GV20) with Yanmar 3TNV88 water-cooled engine and water-cooled permanent magnet alternator (PMG). Variable speed & inverter technology for up to ~30% fuel savings, ultra-quiet operation (54 dB @7m), low consumption, intelligent digital management and multi-level protection.

SLEEPER 15kW Marine Generator Specification

Generator
Model M-GV20
Dimensions（LxWxH)(mm) 890×590×690
Net weight(Kg) 265
Noise(dBa/7m) 54
Cooling system Dual circuit freshwater cooling via a heat exchanger

Performance
Frequency(Hz) 50 / 60
Output Voltage(V) 230 /120
Voltage stability ≤3%
Frequency Stability ±0.1%
Max power (kW) 17
Continuous power(kW) 15
Voltage regulation Electronic
Frequency regulation Electronic

Control
Start system 12VDC
Auto start Integrated
Control panel Digital display control（DDC local + DDC remote）
Inverter (with DDC local) PMG 20
Inverter weight (Kg) 18
Inverter dimensions（mm） 463 x 234 x180

Engine
Engine brand YANMAR
Engine model 3TNV88
Cylinder 3 cylinder
Displacement(cc) 1642
Speed(rpm) 2000-2600
Fuel Diesel
Consumption（L/hr） 1.5-4.8
Oil capacity(L) 6.7

Marine generator 20 kW

Sleeper Marine 20 kW variable speed generator with water-cooled Yanmar engine and water-cooled permanent magnet alternator.

SLEEPER 20kW Marine Generator Specification

Generator
Model M-GV25
Dimensions（LxWxH)(mm) 930x590x690
Net weight(Kg) 275
Noise(dBa/7m) 54
Cooling system Dual circuit freshwater cooling via a heat exchanger

Performance
Frequency(Hz) 50 / 60
Output Voltage(V) 230 /120
Voltage stability ≤3%
Frequency Stability ±0.1%
Max power (kW) 22
Continuous power(kW) 20
Voltage regulation Electronic
Frequency regulation Electronic

Control
Start system 12VDC
Auto start Integrated
Control panel Digital display control（DDC local + DDC remote）
Inverter (with DDC local) PMG 25
Inverter weight (Kg) 21.5
Inverter dimensions（mm） 495 x 265 x183

Engine
Engine brand YANMAR
Engine model 3TNV88
Cylinder 3 cylinder
Displacement(cc) 1642
Speed(rpm) 2200-2800
Fuel Diesel
Consumption（L/hr） 1.5-6.8
Oil capacity(L) 6.7

Maract
Supply of marine spare parts and marine lubricants- Off-the-shelf solutions

Contact

41 Agiou Dimitriou, Piraeus 185 46

+30 2104617999 ext: 211/227

+30 6936060607
+30 6985935407

info@maract.gr

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