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This type of alternator is the world standard
because of its ability to produce the initial
power surge required by inductive appliances
such as electric motors and compressors.
Precise voltage regulation generates optimal
power with a clean sine wave. There is no
need for a large enclosure with capacitors,
usually found on a-synchronous generators.
Mastervolt generators do not contain
brushes, they regulate their own voltage and
are maintenance-free. The Ultra model 10
and 12.5 is supplied with Electronic Governor.
Advanced Digital DieselControl now standardThe new Whisper generator sets are stan-
dardly supplied with this very advanced
digital control system. Some of the major fea-
tures are automatic starting and stopping
combined with monitoring functions, both
actual and historical: V/Amps/frequency/load
and operating hours readout. Furthermore it
supports fault finding and maintenance.
You can find a detailed description
in this datasheet.
DIESEL GENERATORS (WHISPER)Ultra silent watercooled diesel generators,
3600 & 1800 rpm
Mastervolt’s comprehensive range of AC
diesel generators is ultra-quiet, compact, easy
to install and reliable. All shipboard con-
veniences such as washer/dryers, air-con-
ditioning systems and other AC appliances are
now available to you at a push of a button. At
the same time, your batteries are being
recharged quickly, allowing you to switch
back to silent inverter power for the
remainder of the day.
Comprehensive rangeWhisper generators are available as 3600 rpm
sets (for 50Hz output 3000 rpm) and 1800
rpm (1500 rpm when 50Hz output). The
range has now been extended with 3 new
Ultra models; an 9.5, 12.5 and 30 kVA model
(8, 10 and 25 kVA at 50Hz). Another
innovation: the entire Whisper range is now
fitted as standard with the new Digital Diesel
Control system. We have also renamed our
generator range: the Whisper 3500 for
example becomes Whisper 3.5.
Technology explained :The engineMastervolt uses indirect-injected four-stroke
diesel engines manufactured by Mitsubishi &
Kubota. Exceptionally quiet, compact and
smooth running, these high-tech engines con-
form to the strictest emission level require-
ments and are extremely environmentally
friendly. The Whisper engines are designed
for marine use and are soft mounted inside a
sound shield.
Cooling principleAll engines are heat exchanged cooled. The
combustion air is cooled as well, to ensure op-
timal performance under extreme conditions.
The alternator is water-cooled by an integra-
ted cooler made of seawater-corrosion proof
cupra-nickel, with the exception of the Ultra
25 model which has an air-cooled alternator.
The power sectionAll Whisper generator sets are fitted with a
synchronous alternator.
Systems, not just boxesAn important advantage offered by Master-
volt is the availability of a wide range of
custom designed system components such as
the silencer/waterlock, exhaust water/gas
separators, DC kits for starting, etc. Most of
them are offered as a complete kit, including
our spare parts.
• EXTREMELY COMPACT
• ULTRA QUIET
• DIESEL POWERED
• SYNCHRONOUSALTERNATOR
• ALL-WATERCOOLED
• COMPREHENSIVE DIGITAL MONITORING AND CONTROLAS STANDARD
• CUSTOM DESIGNEDINSTALLATION PARTS
• EASY TO INSTALL
• WORLD WIDE SERVICE
Version no. US121004.Part # 500003606.
NEW :Digital Diesel Control
C B
A
TECHNICAL SPECIFICATIONS 3600/3000 RPM MODELS
Dimensions (in inches) for 3600/3000 rpm versions:Model 3.5 6 8 12
• length 19.9 26 26 31.9
• width 15.9 19.5 19.5 20.7
• height 19.7 21.7 21.7 24.2
• A 12 16 16 21.7
• B 16.1 19.5 19.5 21.7
• C 16.9 20.5 20.5 23.6
top view
Whisper 3.5,part # 50900555.
Whisper 3.5 Whisper 6 Whisper 8 Whisper 12
Part # 120V or 120/240V 60Hz 50900555 50902055 50903055 50904055
Part # 230V/50Hz* 50900500 50902005 50903005 50904005
Engine type & manufacturer 4-stroke Kubota 4-stroke Mitsubishi 4-stroke Mitsubishi 4-stroke Mitsubishi
Nominal rpm 60 or 50Hz 3600 or 3000 RPM 3600 or 3000 RPM 3600 or 3000 RPM 3600 or 3000 RPM
Engine model OC60 L2E L2E L3E
Number of cylinders 1 2 2 3
Cylinder capacity 276 cc 635 cc 635 cc 952 cc
Bore & stroke 2.8 x 2.7 inch 2x 3 x 2.8 inch 2x 3 x 2.8 inch 3x 3 x 2.8 inch
Air consumption@3000 rpm 0.38 m3/min. 0.95 m3/min 0.95 m3/min 1.43 m3/min
Engine cooling oil-cooled indirect watercooling indirect watercooling indirect watercooling
ø wet marine exhaust hose int. 15⁄8” 15⁄8” 15⁄8” 15⁄8”
ø dry exhaust pipe 1”BSP 1" BSP n.a. 11⁄2" BSP
Outside water pump (impeller type) Mastervolt model K Mastervolt model M Mastervolt model M Mastervolt model M
Pump capacity 2.6-3.2 gpm 4.8 gpm 4.8 gpm 4.8 gpm
Fuel diesel diesel diesel diesel
Fuel consumption 0.18-0.31 gph 0.26-0.66 gph 0.26-0.79 gph 0.26-1.05 gph
Fuel supply pump electric 12V DC electric 12V DC electric 12V DC electric 12V DC
Location oil refill cap top & side top & side top & side top & side
Starting system 12V DC grounded 12V DC grounded 12V DC grounded 12V DC grounded
Ground isolated version optional optional optional optional
Starter battery, gel type, optional 12V 55 Ah / group 24 12V 85 Ah / group 27 12V 85 Ah / group 27 12V 85 Ah / group 27
Battery charge current auxiliary winding 8A alternator 40A alternator 40A alternator 40A
Remote control panel Digital Diesel Control Digital Diesel Control Digital Diesel Control Digital Diesel Control
Second remote control panel optional optional optional optional
Alternator water-cooled, brushless, synchronised
Voltage regulation capacitor capacitor capacitor capacitor
Nominal voltage 60Hz / 50Hz 240V, 120/240V / 230V
Nominal power 60Hz 4 kVA, 3.2 kW 7.1 kVA, 5.7 kW 9.2 kVA, 7.4 kW 14.5 kVA, 11.6 kW
Nominal power 50Hz 3.75 kVA, 3 kW 6.25 kVA, 5 kW 8 kVA, 6.4 kW 12 kVA, 9.6 kW
Power factor 0.8 0.8 0.8 0.8
Tolerance frequency (Hz) ± 5% ± 5% ± 5% ± 5%
Tolerance voltage (V) ± 6% ± 6% ± 6% ± 6%
Dry weight 190 lbs 392 lbs 392 lbs 462 lbs
Max. angle when continually in use 25º in any direction
* Please consult our website (www.mastervolt.com) for the exact specifications of our 50Hz versions.
• Optional: generator and installation kits for keelcooling applications (dry exhaust) and ungrounded versions.
C B
A
Whisper 20 Ultra.
See our price list / catalog for all built-in parts or surf to www.mastervoltusa.com
Whisper 20 kVA Ultra, with the service side open.
New:Both Whisper 15 kVA and 20 kVA
models are now fitted with sound
shields consisting three parts.
Our 7, 9.5 and 30 kVA models will
be supplied with a new sound shield
generation.
Dimensions (in inches) for 1800 rpm modelswith sound shield:Ultra 7 9.5 12.5 15 20 30
• length 31.9 35.4 35.4 41.7 45.3 48
• width 20.7 24.2 24.2 24.2 26.8 24.4
• height 24.2 27.2 27.2 27.2 29.5 29.1
• A 21.7 -- -- 22 29.9 --
• B 21.7 -- -- 23.5 27.6 --
• C 23.6 -- - 25.5 29.5 --
Whisper 7 Ultra.
Whisper 15 Ultra.
Whisper 7 Ultra,one service side.
TECHNICAL SPECIFICATIONS 1500/1800 RPM MODELSWhisper 7 Ultra Whisper 9.5 Ultra* Whisper 12.5 Ultra* Whisper 15 Ultra Whisper 20 Ultra Whisper 30 Ultra*
Part # 120V or 120/240V 60Hz 50905055 50906055 50909055 50907055 50908055 50901055
Part # 230V/50Hz 50905005 (6 Ultra) 50906005 (8 Ultra) 50909005 (10 Ultra) 50907005 (12 Ultra) 50908005 (16 Ultra) 50901005 (25 Ultra)
Engine type & manufacturer 4-stroke Mitsubishi 4-stroke Mitsubishi 4-stroke Mitsubishi 4-stroke Mitsubishi 4-stroke Mitsubishi 4-stroke Mitsubishi
Nominal rpm 60 or 50Hz 1800 or 1500 1800 or 1500 1800 or 1500 1800 or 1500 1800 or 1500 1800 or 1500
Engine model L3E S3L2 S3L2 S4L2 S4Q2 S4S
Number of cylinders 3 3 3 4 4 4
Cylinder capacity 952 cc 1318 cc 1318 cc 1758 cc 2505 cc 3331 cc
Bore & stroke 3x 3 x 2.8 inch 3x 3.1 x 3.6 inch 3x 3.1 x 3.6 inch 4x 3.1 x 3.6 inch 4x 3.5 x 4 inch 4x 3.7 x 4.7 inch
Air consumption 0.8 m3/min 1.1 m3/min 1.1 m3/min 1.5 m3/min 2.1 m3/min 2.8 m3/min
Engine cooling indirect water-cooling indirect water-cooling indirect water-cooling indirect water-cooling indirect water-cooling indirect water-cooling
ø wet marine exhaust hose int. 15⁄8” 2” 2” 2” 2” 21⁄2”
ø dry exhaust pipe 11⁄2" BSP 11⁄2” BSP 11⁄2” BSP 11⁄2" BSP 11⁄2" BSP 2” BSP
Outside water pump (impeller type) Mastervolt model M12 Mastervolt model M12 Mastervolt model M12 Mastervolt model M12 Mastervolt model M16 Mastervolt model M16
Pump capacity 4 gpm 4.8 gpm 4.8 gpm 4.8 gpm 5.8 gpm 5.8 gpm
Fuel diesel diesel diesel diesel diesel diesel
Fuel consumption 0.26-1.05 gph 0.26-1.05 gph 0.26-1.05 gph 0.26-1.05 gph 0.26-1.32 gph 0.26-2.1 gph
Fuel supply pump electric 12V DC electric 12V DC electric 12V DC electric 12V DC mechanical mechanical
Location oil refill cap top & side top & side top & side top & side top top
Starting system 12V DC negative ground 12V DC negative ground 12V DC negative ground 12V DC negative ground 12V DC negative ground 12V DC negative ground
Ground isolated version optional optional optional optional optional optional
Starter battery (optional) 12V 85 Ah / group 27 12V 85 Ah / group 27 12V 85 Ah / group 27 12V 85 Ah / group 27 12V 120 Ah / 4D 12V 120 Ah / 4D
Battery charge current alternator 40A alternator 50A alternator 50A alternator 50A alternator 50A alternator 50A
Remote control panel Digital Diesel Control Digital Diesel Control Digital Diesel Control Digital Diesel Control Digital Diesel Control Digital Diesel Control
Second remote control panel optional optional optional optional optional optional
Alternator water-cooled, brushless, synchronous** air cooled, brushless, synchronous
Voltage regulation single phase / dual voltage capacitor + AVR (optional) capacitor + AVR (optional) capacitor + AVR (optional) capacitor + AVR (optional) capacitor + AVR (optional) AVR
Voltage regulation 3-phase** n.a. n.a. n.a. AVR AVR AVR
Nominal voltage 60Hz 120/240V 120/240V 120/240V 120/240V or 3-phase 120/240V or 3-phase 120/240V or 3-phase
Nominal voltage 50Hz 230V 230V 230V 230V or 3-phase** 230V or 3-phase** 230V** or 3-phase**
Nominal power 60Hz 7 kVA, 7 kW 9.5 kVA, 9.5 kW 12.5 kVA, 12.5 kW 15 kVA, 15 kW 20 kVA, 20 kW 30 kVA, 30 kW
Nominal power 50Hz 5.7 kVA, 5.7 kW 8 kVA, 8 kW 10 kVA, 10 kW 12 kVA, 12 kW 16 kVA, 16 kW 25 kVA, 25 kW
Power factor 1 1 1 1 1 1
Governor mechanical mechanical electronic mechanical mechanical mechanical
Tolerance frequency (Hz) ± 5% ± 5% ± 0.5% ± 5% ± 3% ± 3%
Tolerance voltage (V) ± 5% ± 5% ± 3% ± 5% ± 5% ± 2%
Dry weight 496 lbs 573 lbs 573 lbs 683 lbs 825 lbs 926 lbs
Max. angle when continually in use 25º in any direction
PTO hydraulic pump n.a. optional optional optional optional optional
* Available from September 2004 onwards.** 3-phase alternators are not watercooled. top view
Optional: • PTO (power take off) at the rear, for 8-25 kW models.
• ungrounded versions.
Easy to installThe Digital Diesel Control system consists of a
central control unit and a local control panel
already installed on the generator set, and a re-
mote panel as a user friendly interface between
the operator and the generator. Communication
between the remote panel and control unit takes
place by means of a ‘plug in’ communication
cable that is included with the system.
Now the system is ready to be used and no
further settings are required!
Easy to operateBasic operation of the Digital Diesel Control is
very easy: a short push on the start button will
initiate the start procedure. Each step in this
procedure is displayed on the panel and shows
for itself. Stopping is possible at any moment by
pushing the stop button briefly. While the
generator set is running the LCD display on the
remote panel shows the most important infor-
mation about the output and load. The load bar
allows observation-at-a-glance of the load as well.
When scrolling through the menu by pushing
the Select button, various advanced actual
engine diagnostic and historical data can be
monitored. In the event of a failure a red LED
indicator lights up and the microprocessor will
stop the engine. After stopping, detailed infor-
mation about the failure is shown on the LCD
display.
Quick Scan DDC functions :
Overview of the DDC menu
LCD display The backlit LCD display shows the actual statusand user specific information of the Whispergenerator. When two blinking stars (*) areshown, the autostart function or the intervalmode is activated.
Generator control buttonsA simple touch of the Start buttonwill start the generator at any time.Press Stop for an immediate stop.
Set and Select Press the Set and Select buttons fornavigation through theprogramming and read-out menus.
Read out informationBoth actual and historical information is shown: • Voltage, Amps, frequency at the output of the generator. • Load in kVA and as a percentage of the total available power.• Voltage of the starter battery and an additional second battery.• Deepest battery voltage. • Time before maintenance.• Latest warnings.
Programming • Alarm function set points: low AC voltage,
high amps, low frequency, low battery. • Adjustment of engine control.• Autostart function: to start the generator
on low battery voltage.• Interval mode to start and stop the
generator at any desired moment.
Load bar The load bar displays the approximate load that is connectedto the generator in proportion to the maximum availablepower. Each LED represents 20% of the available power.In the event of an overload situation a red LED illuminates.
DIGITAL DIESEL CONTROL DESCRIBED
• Energy menu. Allows you to adjust the setpoints of the alarm functions.
• Engine menu.Allows you to adjust the Digital Diesel Control according to the engine specifications.
• Autostart menu. Allows adjustment of trigger points to start and stop the generator automatically
because of a low battery voltage (restricted access).
• Interval menu. Settings to run the generator periodically (restricted accessibility).
• Display menu.Used to reset and adjust several parameters according to the user specific
requirements, e.g. the internal clock.
Read our detailed ‘Mastervolt DDC Technical description’ on our website.
WORLDS BEST POWER
IMPORTANT INSTALLATION PARTS
Our new Delta water/exhaust gas separator is an essential component of a
silent and reliable exhaust system. The Delta system removes the principle
cause of back pressure and stops the irritating sploshing noise, known from
conventional exhaust systems. The Delta separator is made from high
resistant fiberglass, fitted with multi-fit brass connections, suitable for 15⁄8” or
2” ø hose diameters. The stainless steel bracket is supplied as standard.
Depth of the system including bracket is 6.7 inch only. The Delta separator
has been designed to fit in any (Whisper) generator system up to 20 kVA
rating.
Part # 50230097.
Our new Delta silencer/waterlocks are designed for use with Whisper
generators positioned on or below the waterline. The Delta silencer systems
have excellent acoustics, are high temperature proof and designed for any
(Whisper) generator system from 3.5 to 20 kVA. The naval brass hose
connections are suitable for 15⁄8” or 2” ø hoses. Mounting bracket supplied
as standard.
Part # 50230093.
High quality rubber exhaust hoses (15⁄8” or 2”), Lloyds cert. DNV S-2793, are
available from stock. Upon request supplied with hose clamps, elbows, etc.
Ask for our complete exhaust kit overview.
We offer an additional full maintenance free gel battery, together with a 3-
step charger, battery (230V AC supply required) terminals plus protection
covers and a DC switch as a ready-to-install electrical kit.
Practical spare part kits are available of the shelf.
Useful add-on for our one-cylinder Whisper 3.5 and Whisper 6 - 3000 rpm:
galvanised steel mounting plate, ensuring an optimal vibration free
installation.
WWW.MASTERVOLTUSA.COM
Your dealer:
Mastervolt USA, Inc.: 70 Water Street - Thomaston ME 04861 - tel. (207) 354-06183211 S. Andrews Avenue - Ft. Lauderdale FL 33316 - tel. (954) 779-2627