Mastervolt MASS COMBI ULTRA 12/3000-150 Operating manual

MASS COMBI ULTRA
12/3000-150, 24/3500-100, 48/3500-50
MULTI PURPOSE CHARGER INVERTER
USER AND INSTALLATION MANUAL
10000006554/08
To download this manual in other languages, please
visit our website: www.mastervolt.com

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
OVERVIEW MASS COMBI ULTRA
Figure 0-1: Overview of the Mass Combi Ultra
1. Display with front switch
6. Mains AC input terminal (“MAINS”)
11. Fan (3x)
2. Main battery negative
7. Generator AC input terminal (“GEN”)
12. Ground stud
3. Main battery positive
8. AC output 1 (“OUT-1”)
13. Sync connector (2x)
4. Secondary battery positive (“SEC”)
9. AC output 2 (“OUT-2”) (switched)
14. Temperature sensor connector
5. Solar DC terminal (“SOLAR”)*
10. DIP switch units (2x8)
15. MasterBus connector (2x)
* Models 12/3000-150 and 24/3500-100 only
1
2
3
4
5
6
78
9
11
12
13
14
15
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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
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TABLE OF CONTENTS:
OVERVIEW MASS COMBI ULTRA............................................................................................................................................2
1GENERAL INFORMATION.............................................................................................................................................. 5
1.1 Product description.............................................................................................................................................5
1.2 Use of this manual..............................................................................................................................................5
1.3 Validity of this manual.........................................................................................................................................5
1.4 Disclaimer...........................................................................................................................................................5
1.5 Scope of warranty ..............................................................................................................................................5
1.6 Liability ...............................................................................................................................................................5
1.7 Changes to the Mass Combi Ultra......................................................................................................................5
1.8 Identification label...............................................................................................................................................5
2SAFETY GUIDELINES AND WARNINGS.......................................................................................................................6
2.1 Warnings and symbols.......................................................................................................................................6
2.2 Use for intended purpose...................................................................................................................................6
2.3 Organizational measures....................................................................................................................................6
2.4 Warning of special dangers................................................................................................................................6
2.5 General safety and installation precautions........................................................................................................6
2.6 Warning regarding life support applications........................................................................................................7
2.7 Warning regarding the use of batteries...............................................................................................................7
3HOW IT WORKS..............................................................................................................................................................8
3.1 Principle..............................................................................................................................................................8
3.2 Battery charger...................................................................................................................................................8
3.3 Inverter...............................................................................................................................................................9
3.4 Operation modes................................................................................................................................................9
4OPERATION.................................................................................................................................................................. 13
4.1 LED indicators..................................................................................................................................................13
4.2 Protections .......................................................................................................................................................14
4.3 Operation policies.............................................................................................................................................14
4.4 Maintenance.....................................................................................................................................................15
4.5 Daily use, MasterBus monitoring......................................................................................................................15
5INSTALLATION .............................................................................................................................................................16
5.1 Unpacking ........................................................................................................................................................16
5.2 Environment.....................................................................................................................................................16
5.3 Wiring...............................................................................................................................................................16
5.4 Things you need...............................................................................................................................................17
5.5 Removal of the front lid.....................................................................................................................................17
5.6 Mounting the cabinet to a surface ....................................................................................................................18
5.7 Wiring instructions............................................................................................................................................18
5.8 Installation overview.........................................................................................................................................19
5.9 Setting up a MasterBus network.......................................................................................................................20
5.10 How to set up a MasterBus network................................................................................................................. 20
6CONFIGURATION .........................................................................................................................................................21
6.1 Configuration via DIP-switches.........................................................................................................................21
6.2 MasterBus configuration...................................................................................................................................22
7COMMISSIONING, DECOMMISSIONING.....................................................................................................................26
7.1 Commissioning.................................................................................................................................................26
7.2 Decommissioning.............................................................................................................................................26
7.3 Trouble shooting...............................................................................................................................................26

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
8TECHNICAL DATA........................................................................................................................................................ 28
8.1 Specifications...................................................................................................................................................28
8.2 Correct disposal of this product........................................................................................................................30
8.3 Dimensions.......................................................................................................................................................30

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
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1 GENERAL INFORMATION
1.1 Product description
The Mass Combi Ultra is a multifunctional charger inverter.
It passes through power from an external AC source (e.g. a
generator or shore power connection) to your AC loads and
charges your main batteries.
In addition, it can charge a secondary battery bank with a
dedicated charge algorithm. Solar modules can be
connected for additional power to charge both battery
banks.
1.2 Use of this manual
This manual serves as a guideline for the safe and
effective use and installation of the Mass Combi Ultra, also
called Combi Ultra further in this manual:
For the installer this manual gives directions for the
installation, operation and commissioning.
For the end user, this manual gives directions for the
operation, maintenance and possible correction of
minor malfunctions.
Every person who works with the device should be
familiar with the contents of this manual, and must
carefully follow the instructions contained herein.
Store the manual in an accessible place.
1.3 Validity of this manual
This manual is valid for the following models:
Part no
Model
38013000
Mass Combi Ultra 12/3000-150
38023500
Mass Combi Ultra 24/3500-100
38043500
Mass Combi Ultra 48/3500-50
All the specifications, provisions and instructions contained
in this manual apply solely to the Mastervolt-delivered
standard version of a single Mass Combi Ultra.
1.4 Disclaimer
Our products are subject to continual development and
improvement. Therefore, additions or modifications to the
products may cause changes to the technical data and
functional specifications. No rights can be derived from this
document. Please consult our most current Terms &
Conditions of Sale.
1.5 Scope of warranty
Mastervolt assures the product warranty of the Mass
Combi Ultra during two years after purchase, on the
condition that all instructions and warnings given in this
manual are taken into account during installation and
operation.
Among other things, this means that installation is carried
out by a qualified electrician, that installation and
maintenance are executed according to the stated
instructions and correct working sequence, and that no
changes or repairs may have been performed on the Mass
Combi Ultra other than by Mastervolt. The warranty is
limited to the costs of repair and/or replacement of the
product by Mastervolt only.
Costs for installation labour, shipping of the defective parts
and indirect damage are not covered by this warranty. For
making an appeal on warranty you can contact your
supplier directly, stating your complaint, application, date of
purchase and part number / serial number.
1.6 Liability
Mastervolt accepts no liability for:
consequential damage due to use of the Mass Combi
Ultra;
possible errors in the manuals and the results thereof.
use that is inconsistent with the purpose of the product.
1.7 Changes to the Mass Combi Ultra
Changes to the Mass Combi Ultra may be carried out only
after obtaining the written permission of Mastervolt. This is
not applicable for DIP-switches which are used for user
settings.
1.8 Identification label
Figure 1-1: Example of an identification label
The identification label is positioned at the right side of the
Mass Combi Ultra, see figure 1-1.
CAUTION!
Never remove the identification label.

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
2 SAFETY GUIDELINES AND WARNINGS
2.1 Warnings and symbols
Safety instructions and warnings are marked in this manual
and on the product by the following pictograms:
A procedure, circumstance, etc. which deserves
extra attention.
CAUTION!
Special information, commands and prohibitions
in order to prevent damage.
WARNING
A WARNING refers to possible injury to the user
or installer or significant material damage to the
Mass Combi Ultra if the installer / user does not
(carefully) follow the stated procedures.
Read this manual before installation and use
This product complies with the EC directives and
standards.
Degree of protection: IP23. The product is
protected against touch by fingers and water
spray < 60 degrees from vertical.
Safety class 1. This product must be provided
with an equipment grounding conductor to the
AC-output ground terminal
2.2 Use for intended purpose
1 The Mass Combi Ultra is constructed as per the
applicable safety-technical guidelines.
2 Use the Mass Combi Ultra only:
for the charging of batteries and the supply of
loads attached to these batteries, in permanent
systems;
for the conversion of battery DC voltage to AC
voltage;
when connected to a dedicated double pole circuit
breaker and RCD;
with fuses, protecting the Mass Combi Ultra AC
and DC wiring;
in a technically correct condition;
in a closed, well-ventilated room, protected
against rain, moist, dust and condensation;
after observing the instructions in the user manual.
WARNING
NEVER connect shore power to the generator
input. This may result in an electric shock!
WARNING
Never use the Mass Combi Ultra in situations
where there is danger of gas or dust explosion
or potentially flammable products!
3 Use of the Mass Combi Ultra other than mentioned in
point 2 is considered to be inconsistent with the
intended purpose. Mastervolt does not hold itself liable
for any damage resulting from the above.
2.3 Organizational measures
The user must always:
have access to the user manual;
be familiar with the contents of this manual. This
applies in particular to chapter 2, Safety Guidelines and
Measures.
2.4 Warning of special dangers
1 If the Mass Combi Ultra is switched off during
maintenance and/or repair activities, it should be
secured against unexpected and unintentional
switching on:
Remove the AC supply.
Remove the connection to the batteries.
Be sure that others cannot reverse the measures
taken.
2 If maintenance and repairs are required, use only
original spare parts.
2.5 General safety and installation precautions
Do not expose the Mass Combi Ultra to rain, snow,
spray, moisture, excessive pollution and condensing
circumstances. To reduce risk of fire hazard, do not
cover or obstruct the ventilation openings. Do not install
the Combi Ultra in a non-ventilated area, overheating
results.
The Mass Combi Ultra must be provided with an
equipment grounding conductor to the AC-input ground
terminal. Grounding and all other wiring must comply
with local rules and regulations.
In case of fire, you must use a fire extinguisher which is
appropriate for electrical equipment.
Short circuiting or reversing polarity will lead to serious
damage to batteries, Combi Ultra and wiring. Fuses
between batteries and Combi Ultra cannot prevent
damage caused by reversed polarity and warranty will
be void.
Protect all DC wiring with a proper fuse, according to
the guidelines in this manual.
Connection and protection must be done in accordance
with local standards.
Do not work on the Mass Combi Ultra or system if it is
still connected to a power source. Only allow changes
in your electrical system to be carried out by qualified
electricians.

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
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Check the wiring and connections at least once a year.
Defects such as loose connections, burnt cables etc.
must be corrected immediately.
Do not touch the equipment when wet or with clammy
hands.
Not only the batteries, but the Mass Combi Ultra as well
can become a projectile if your vehicle is involved in an
accident! Ensure adequate and secure mounting and
always use suitable transportation handling equipment.
Except for the connection compartment, see section
5.5, the cabinet of the Mass Combi Ultra must not be
opened. There are no serviceable parts inside the
cabinet. Only qualified, authorized and trained
electricians are allowed to open the connection
compartment.
2.6 Warning regarding life support applications
The Mass Combi Ultra products are not sold for
applications in any medical equipment intended for use as
a component of any life support system unless a specific
written agreement pertaining to such intended use is
executed between the manufacturer and Mastervolt. Such
agreement will require the equipment manufacturer either
to contract additional reliability testing of the Mass Combi
Ultra parts and/or to commit to undertake such testing as a
part of the manufacturing process. In addition the
manufacturer must agree to indemnify and not hold
Mastervolt responsible for any claims arising from using
Mass Combi Ultra parts for life support equipment.
2.7 Warning regarding the use of batteries
Excessive battery discharge and/or high charging voltages
can cause serious damage to batteries. Do not exceed the
recommended limits of your batteries. Avoid short circuiting
batteries, as this may result in explosion and fire hazard.
Installation of the batteries and adjustments of the Mass
Combi Ultra should only be undertaken by authorised
personnel!

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
3 HOW IT WORKS
The Mass Combi Ultra is a multifunctional charger inverter.
It combines an inverter, a battery charger with secondary
(small) charger, an AC transfer switch and a solar charger*.
3.1 Principle
Figure 3-1: Working principle of the Mass Combi Ultra
3.1.1 User interface (1)
The Mass Combi Ultra user interface consists of a front
switch with status LEDS and MasterBus communication.
3.1.2 AC transfer switch (2)
This part of the Mass Combi Ultra regulates the AC energy
flow through the device. The generator (“GEN”) and mains
(“MAINS”) input are switched, as is AC output 2 (“OUT-2”).
All AC is connected to the inverter (3). If the MAINS plug is
disconnected and the Generator is not running, the inverter
takes over using battery power to provide AC power.
3.1.3 Inverter/ Main charger (3)
This part converts the AC power to DC for charging of the
main battery and it inverts the DC power from the battery to
supply AC to Output 1 and 2. (“OUT-1” and “OUT-2”).
* Models 12/3000-150 and 24/3500-100 only
3.1.4 Solar charger (4)*
The PV input (“SOLAR”) is meant for the connection of a
PV-array. The PV-voltage is converted to the proper DC
voltage for battery charging.
3.1.5 Secondary charger (5)
The secondary battery charger (“SEC”) is suitable for a
secondary battery set or as power supply.
3.2 Battery charger
The built-in battery charger is electronically controlled. It is
designed for optimal recharging of lead acid (flooded, gel,
AGM) and Li-ion batteries. Battery charging via AC or Solar
input is accomplished with Mastervolt’s 3-Step+ charging
algorithm. With an external AC source connected, the
Mass Combi Ultra charger also serves the functions of an
AC to DC converter to supply DC loads which are
connected to the batteries. Simple, automatic operation is
enabled by the microprocessor that is the brain of the
inverter/charger combination.
Figure 3-2: 3-step+ charge system
3.2.1 3-step+ charge system
See figure 3-2. The first step of the 3-step+ charge system
is the BULK phase, in which the output current of the
charger is 100 %, and the greater part of the battery
capacity is charged rapidly. The current charges the
batteries and gradually the voltage rises to the absorption
voltage, refer to the specifications. The duration of this
phase depends on the ratio of battery capacity to charger
current, the loads connected and the degree to which the
batteries were discharged to begin with.
The bulk phase is followed by the absorption phase.
Absorption charging ends when the battery is completely
full. Battery voltage remains constant throughout this stage
and the charge current decreases during charging of the
battery. With flooded batteries this stage lasts some four
hours, with gel and AGM around three. Once the battery is
100 % full or when the maximum absorption timer has
passed, the charger automatically switches over to the float
phase.
*
*

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
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During the float phase the Mass Combi Ultra switches to
Float voltage, refer to the specifications, and stabilises this
voltage to maintain the batteries in an optimum condition.
Connected DC-loads are powered directly by the charger.
If the load is higher than charger capacity, the required
additional power comes from the battery, which will be
progressively discharged until the charger automatically
switches back to the bulk phase. Once consumption
decreases, the charger goes back to normal operation of
the 3-step+ charge system.
As the Mass Combi Ultra is equipped with a 3-step+ charge
system, the batteries can also remain connected to the
Mass Combi Ultra in winter. One hour every 12 days the
charger automatically switches to the Bulk phase to keep
the battery working properly and prolong its life span. The
3-step+ charge system is also safe for all the connected
equipment.
3.2.2 Temperature compensated charging
The Mass Combi Ultra is delivered with a battery
temperature sensor. By installing this battery temperature
sensor (for Lead Acid batteries only) the charge voltages
are automatically adapted for deviating temperatures.
When the battery temperature is low, the charge voltage
increases. On the other hand, when the battery
temperature is high, the charge voltage is decreased.
Overcharge and gassing are prevented this way. This will
extend the life of your batteries.
Temperature compensated charging cannot
prevent the batteries from overcharging
situations.
3.2.3 Connection of a secondary battery
The Mass Combi Ultra is equipped with a secondary
charge output to use for charging a small battery set like a
starter battery. If the main battery nominal voltage is 24 V,
the secondary battery can be 24 V or 12 V. Maximum
output current as power supply or battery charger: 10 A.
3.3 Inverter
3.3.1 General
The inverter provides voltage and frequency regulated AC
power from a battery bank. Fast acting electronic circuits
protect the inverter against extreme overloads, low and
high battery voltage and overheating of the inverter.
A large momentary surge power is available for inductive
loads, such as electric motors.
3.3.2 Energy saving mode (selectable)
In the inverter mode the Mass Combi Ultra has a built-in
automatic energy saving feature that reduces battery
power consumption when no load is present on the
outputs. Response from idle is instant. In most cases the
operation is not noticeable. The energy saving mode can
be set by means of MasterBus or dipswitch A4, refer to
chapter 6, Configuration.
The Mass Combi Ultra scans the AC outputs with pulses of
230 V every 2½ seconds. When it detects a load that is
larger than 50 W (adjustable), it switches On the inverter
automatically.
Small loads such as clocks in VCRs or micro
waves are most likely not to work in this mode.
3.4 Operation modes
In the next sections different operation modes are
described.

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
3.4.1 Inverting mode
See figure 3-3. When there is no external AC power
available, the inverter of the Mass Combi Ultra provides AC
power on the AC outputs.
Figure 3-3: Inverting mode
3.4.2 Charging mode
See figure 3-4 and 3-5. When external AC power comes
available on the Mains- or Gen input, the main battery will
be charged and the AC outputs are supplied by the
external power.
Figure 3-4: AC power from Generator input
Figure 3-5: AC power from Mains input
3.4.3 Output 1 and 2
See figure 3-6. The Mass Combi ultra has two AC-outputs.
AC-power is always available on output 1 and this is the
ideal output for loads that need continuous AC-power.
Output 2 is only available when external AC power comes
available on the Mains- and/or Gen input. Output 2 policy is
configurable by the dipswitches locally on the Mass Combi
Ultra or a MasterBus monitoring device. (See chapter
4.3.2).
Figure 3-6: Out-1 and Out-2

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
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3.4.4 Power sharing mode
See figure 3-7. If the available power at the AC-input is
limited, and the load connected to the AC output increases,
the external AC circuit breaker may trip if nothing is done.
To avoid this, the Mass Combi Ultra can automatically
reduce the battery charger output, and thus the AC power
consumption.
The Power Sharing level should be set to match the value
of the external circuit breaker, which protects the incoming
AC power. For example, when the external AC power is
limited by a 6 A fuse, the Power Sharing level must be set
to 6 A. When the total connected AC load reaches the
level of the Power Sharing setting (6 A), there will be no
power left over to charge the battery. This means that the
charge current of the Mass Combi will be reduced to 0 A.
The Power Sharing level can be adjusted by means of the
DIP-switches locally on the Mass Combi Ultra. However,
we recommend the use optional remote control, like the
MasterView Easy.
Figure 3-7: Power Sharing level is set to a 6 A while the AC
outputs consume a total of 4 A. This means that 6 –4 = 2 A
is left over for charging.
3.4.5 Gen-/Mains support
See figure 3-8. If the demand for AC power is higher than
the available power at the AC–input, the external AC circuit
breaker may trip if nothing is done. This problem can be
solved by the Generator / mains support function. With the
Generator / mains support mode enabled, the inverter will
operate in parallel with the external AC power source. This
means that energy from the batteries is added to the AC-
output only.
Under no circumstances AC power from the inverter can be
fed back into the AC grid. Please mind that several
countries maintain different regulations with regard to AC-
sources operating in parallel with the AC-grid. This may
mean that in some situations the use of the Generator /
Mains support function is not allowed. Please acquaint
yourself with local regulations on this issue. Never use the
Generator / Mains support mode if this is not allowed!
Figure 3-8: Example: The AC-input is limited to 6 A. This is
not enough to supply the total load (4 + 5 = 9 A) connected
to the AC outputs. The inverter will supply the remaining 9
–6 = 3 A.

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
3.4.6 Solar charging
See figure 3-9. DC voltage coming from a solar panel is
converted to DC for battery charging. Refer to the
specifications for allowable solar string voltages. The
available solar charge current will be added to the main
charger current. If the main charger is disabled (e.g. when
external AC power is unavailable) the solar charger will
switch to the Float stage to maintain the battery charge
state.
Figure 3-9: Solar charging active
3.4.7 Secondary charging mode
See figure 3-10. The secondary battery charger is suitable
for a secondary battery set or as power supply (constant
voltage). The secondary charge output is active (charging a
secondary battery) when external AC power comes
available on the Mains- or Gen input. In power supply
mode (constant voltage) the output is also active in inverter
mode.
Figure 3-10: Secondary charger active

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
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4 OPERATION
4.1 LED indicators
See figure 4-1. The operation of the Mass Combi Ultra is
displayed by means of LED indicators at the front side of
the housing. If the Mass Combi Ultra is activated and as
long as none of the red indicators are illuminated, no failure
is detected and the unit is operating normally.
4.1.1 Solar charging LED*
See figure 4-1 item 1. The illuminating top LED indicates
there is a DC input from the PV system. This input is used
to charge both battery banks.
On: PV input.
Off: no PV input.
Blinking: standby, solar voltage out of range.
4.1.2 Generator input LED
See figure 4-1 item 2. The arrow is illuminated if AC power
comes from the generator.
On: generator input,
Off: no generator input,
Blinking: synchronizing,
Blinking fast: AC input out of range.
4.1.3 Mains input LED
See figure 4-1 item 3. The arrow is illuminated if AC power
comes from the mains.
On: mains input.
Off: no mains input.
Blinking: synchronizing.
Blinking fast: AC input out of range.
4.1.4 Power bar LEDs
See figure 4-1 item 4. These LEDs have a double function,
depending on the mode the Combi Ultra is in.
During charging: charge current (20 % of nominal charge
current per LED).
During inverting: 20 % of nominal inverter power per LED).
If the upper LED illuminates red, the inverter is in overload.
4.1.5 AC Output-1 LED
See figure 4-1 item 5. The illuminated arrow indicates that
AC Output-1 is powered.
4.1.6 AC Output-2 LED
See figure 4-1 item 6. The illuminated arrow indicates that
switched AC Output-2 is powered.
4.1.7 Charge bar LEDs
See figure 4-1 item 7. The 3-LED bar has two functions.
During charging the blinking LEDs indicate the charge
phase of the 3-step+ charge algorithm.
During inverting the LEDs give a rough estimation of
the battery voltage: the more LEDs are illuminated, the
higher the battery voltage.
4.1.8 Secondary charging LED
See figure 4-1 item 8. The illuminating arrow indicates the
secondary battery is being charged.
On: charging.
Off: not charging.
Flashing: error.
4.1.9 Main switch
See figure 4-1 item 9. The only control on the Mass Combi
Ultra itself is the main switch on the front of the unit. This
switch controls on, off and Inverter off (Charger only).
After switching on, expect a three till five second delay
before the unit is activated.
With the main switch in position “on“, the Combi Ultra
inverter can also be switched off and on via MasterBus.
If AC power is available on the AC input and within the
specified limits, the Mass Combi Ultra switches on in
Charger Mode and will start to charge the batteries. If the
AC power from the external AC-source is unavailable or
outside the specified limits, the unit switches on as an
inverter.
Move the main switch to the “off” position to switch off the
Mass Combi Ultra.
If the main switch is set to the Inverter Off-position, the
Mass Combi Ultra is only able to work as a charger. This
means that the inverter mode is disabled. This setting is
useful if you want to keep your batteries charged and
maintained in case you have left i.e. in the winter time.
1 Solar charging LED*,
refer to section 4.1.1.
2 Generator input LED,
section 4.1.2.
3 Mains input LED,
section 4.1.3.
4 Power bar LEDs,
section 4.1.4
5 AC Output-1 LED,
section 4.1.5.
6 AC Output-2 LED,
section 4.1.6.
7 Charge bar LEDs.
During charging:
charging state. 4.1.7
8 Secondary charging
LED, 4.1.8
9 Main switch. It has
three positions: On
(up), Off (mid) and
Inverter Off (down).
*
Figure 4-1: Front panel
* Models 12/3000-150 and 24/3500-100 only

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Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
4.2 Protections
The Mass Combi Ultra is protected against overload, short
circuit, overheating and under and over voltage. You can
detect failures from the front panel or from the MasterBus
control panel.
CAUTION!
The Mass Combi Ultra is not protected against
reversing polarity of the DC-input, AC voltage on
the DC-input and extreme over voltage (>300
VAC ) on the AC-input or AC-outputs.
4.2.1 Output overload or short circuit
In case of overload or short circuit during inverter mode,
the Power bar top LED illuminates red and the output
voltage of the Mass Combi Ultra is limited. Mass Combi
Ultra shuts down if this overload or short circuit lasts over 5
seconds. The Mass Combi Ultra will automatically restart
after shutdown. After 5 failed start attempts the Mass
Combi Ultra shuts down permanently, the Power bar top
LED and the Charge bar bottom LED stay blinking red. You
can restart the Mass Combi Ultra only by switching the unit
manually off and on with the main switch on the Mass
Combi Ultra after the overload or short circuit is removed.
4.2.2 Overheating
In the event of overheating the Mass Combi Ultra inverter
shuts down, the charger reduces charge current.
Overheating is most likely caused by:
heavy or non-resistive loads operating for a longer
period.
high ambient temperature.
disrupted air flow (dust or too little space).
As soon as the temperature drops below the factory default
threshold, the inverter is powered up automatically or the
charger resumes its charge current.
4.2.3 Under and over voltage
The AC-input of the Mass Combi Ultra is, within limits,
protected against over and under voltage. See
specifications. If the AC-input voltage is out of operating
range, the Mass Combi Ultra will switch to inverter mode,
disconnecting both AC inputs and it will switch back if the
AC-input voltage is within range again. The DC-input of the
Mass Combi is also protected against over and under
voltage. See specifications. The Mass Combi Ultra
switches off if the DC-input voltage is out of range.
4.2.4 Dynamic DC input window
Figure 4-2: Dynamic DC input window
The Dynamic DC input window is used to switch off
depending on both the battery voltage and current. The
reason for this is that low current loads cause a small
voltage drop but they are responsible for severe battery
damage.
Shown in figure 4-2 is the graph for a 24 V lead acid
battery. The graph shows three lines:
(1) Low voltage switch on. Above this voltage the inverter
switches on.
(2) Low voltage switch off with delay. Below this line the
inverter switches off after a delay.
(3) Low voltage switch off without delay. Below this line
the inverter switches off without delay.
4.3 Operation policies
Via MasterBus configuration, the preferred behaviour of AC
in and outputs can be set.
4.3.1 AC input policy
Preference
Description
Mains preferent
Mains input is preferred
Gen preferent
Generator input is preferred
Max fuse preferent
AC source with highest fuse setting
Mains only
No generator
Generator only
No mains
4.3.2 AC Output-2 policy
Preference
Description
Events only
Operation manually
Generator input
Generator input only
Mains input
Mains input only
Gen/mains input
Generator or main input
Always on
Always connected to the loads
By .default, AC power is only available on AC output 2 if
external power is available on the Main or Gen input.
See section 6.2, AC transfer, to change the operation
preferences of AC output 2.
24V
22V
17V
02% 100% 200%
21V
19V
1
2
3
U
% I nom

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
15
4.3.3 Secondary charging policy
Secondary battery charging takes place when:
activated by the Force sec charge event (section 6.2.3);
charging from AC input;
set to a constant voltage (section 6.1, 6.2).
4.4 Maintenance
Checking all connections every 6 months is required.
Further, no specific maintenance is required. If necessary,
use a soft clean cloth to clean the Mass Combi Ultra. Do
not use any liquids or corrosive substances, such as
solvents, alcohol, petrol or abrasive components.
4.5 Daily use, MasterBus monitoring
Below table shows the MasterBus Monitoring page. On this
page you can adjust the daily settings.
Value
Meaning
Default
Range
Group-item
Index
General
Device state
The state of your Mass
Combi Ultra
Standby; Inverting; Alarm; Charging; Supporting;
Overload; Low battery
1 - 1
16
Mains fuse
Mains fuse rating
25 A
1..30 A
1 - 2
19
Inverter
Option to switch Off the
inverter to prevent depleting
of your batteries.
On
On; Off
1 - 3
20
Mode
User mode
Initializing; On; Standby; Inverter off; Charger off
1 - 4
60
AC in state
State of the AC input
No AC present, Generator, Mains, Poor quality
1 - 5
4
AC out state
State of the AC output
No AC output, AC out1 only, AC out1&2
1 - 6
5
Main charger
Main charger state
On; Off
1 - 7
58
Sec. charger
Secondary charger state
On
Off; On
1 - 8
14
Solar
charger*
Solar charger state
On
Off; On
1 - 9
15
Battery (DC)
Main charger
Main battery state of
charger
Bulk; Absorption; Float; Standby; Const. volt
2 - 1
18
Main battery
Main battery voltage
0..16 V; 0..32 V; 0..64 V
2 - 2
6
Main battery
Main battery current (minus
is discharging)
-500..500 A
2 - 3
7
Battery temp
Main battery temperature
-25..50 °C, if not connected: ---
2 - 4
21
Shunt device
Selected shunt device for
the main battery
2 - 5
22
Battery SoC
Main battery state of charge
0..100%
2 - 6
23
Sec. charger
Secondary battery charger
state
Bulk; Absorption; Float; Standby; Const. volt;
Error
3 - 1
46
Sec. battery
Secondary battery voltage
10..30 V
3 - 2
43
Sec. battery
Secondary battery current
0..10 A
3 - 3
44
AC inputs
Mains
Mains voltage
0..300 V
4 - 1
8
Mains
Mains current
0..50 A
4 - 2
9
Mains
Mains power
0..10000 W
4 - 3
94
Generator
Generator voltage
0..300 V
4 - 4
95
Generator
Generator current
0..50 A
4 - 5
96
Generator
Generator power
0..20000 W
4 - 6
97
AC outputs
AC output 1
AC output 1 voltage
0..300 V
5 - 1
10
AC output 1
AC output 1 current
0..70 A
5 - 2
11
AC output 1
AC output 1 power
0..20000 W
5 - 3
98
AC output 2
AC output 2 voltage
0..300 V
5 - 4
99
AC output 2
AC output 2 current
0..70 A
5 - 5
100
AC output 2
AC output 2 power
0..20000 W
5 - 6
101
Solar input*
Solar state
State of solar charger
Standby; Charging; Error
6 - 1
42
Solar input*
Solar DC power
0..500 W
6 - 2
41
Solar input*
Solar DC voltage
0..100 V
6 - 3
39
Solar input*
Solar DC current
0..20 A
6 - 4
40
* Models 12/3000-150 and 24/3500-100 only

16
Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
5 INSTALLATION
During installation and commissioning of the Mass Combi
Ultra, the Safety Guidelines & Measures are applicable at
all times. See chapter 2 of this manual.
5.1 Unpacking
In addition to the Mass Combi Ultra the delivery includes:
a battery temperature sensor;
this user manual;
MasterBus terminating device.
After unpacking, check the contents for possible damage.
Do not use the product if it is damaged. If in doubt, contact
your supplier.
Check from the identification label (see section 1.6)
whether your Main battery voltage is the same as the DC-
input voltage of the Mass Combi Ultra (e.g. 24 V main
battery set for a 24 V input voltage). Also check that the AC
output voltage and output power of the Mass Combi Ultra
complies with your system and loads.
5.2 Environment
Obey the following stipulations during installation:
The Mass Combi Ultra is designed for indoor use only.
Ambient temperature: -25 ˚C to 60 ˚C, (power derating
above 40 ˚C).
Maximum usage/installation height: 2000 m.
Humidity: 0-95 % non-condensing.
Mount the Mass Combi Ultra on a solid surface, with
the connecting cables downwards.
Make sure that the hot air produced during operation
can be discharged. The Mass Combi Ultra must be
mounted in such a way that obstruction of the airflow
through the ventilation openings will be prevented.
No objects must be located within a distance of 10 cm /
4 inch around the Mass Combi Ultra. Keep at least 15
cm / 6 inch free space below the Mass Combi Ultra.
Do not locate the Mass Combi Ultra in the same
compartment as the batteries.
Do not install the Mass Combi Ultra straight above the
batteries because of possible corrosive fumes.
5.3 Wiring
The wiring is connected inside the connection
compartment. If necessary, the wiring can be fed from the
top to the bottom side of the cabinet along the back of the
cabinet.
Always use the strain reliefs to fix the wiring. Fix the phase
line wire to terminal L, the neutral wire to terminal N and
the ground wire to terminal PE, see figure 5-1.
Figure 5-1: AC terminal connections
WARNING
NEVER connect shore power to the generator
input. This may result in an electric shock!
5.3.1 AC-wiring
For a safe installation the correct wire cross section must
be applied. Don’t use a cross section that is smaller than
indicated. See table below to select the appropriate cross
section for the AC wiring:
AC-Current
Minimum cross section:
0-20 A
2.5 mm²
AWG 13
20-32 A
4 mm²
AWG 11
32-48 A
6 mm²
AWG 9
48-80 A
10 mm²
AWG 7
Recommended wire colours (refer to local rules and fig 5-1)
Wire color
Meaning
Connected to:
Brown or black
Phase
L1
Blue
Neutral
N
Green/Yellow
Earth
PE / GND
The current entering the Mass Combi Ultra must be limited.
Therefore the AC-input must be protected by a fuse in the
L cable, as specified below. Maximum rating of the
generator AC input fuse: 50 A and Mains AC input fuse: 30
A. The PE/GND cable cross section must be at least equal
to L1.

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
17
5.3.2 DC wiring
Keep in mind that high current will pass through the DC
wiring. Keep the cable length as short as possible, this will
keep the system efficiency as high as possible. The table
shows recommended DC wire sizes:
Model
Minimum cross section:
12/3000 - 150
95 mm²
4/0 AWG
24/3500 - 100
50 mm²
0 AWG
48/3500 - 50
25 mm²
3 AWG
Use M8 cable lugs terminals on the ends of the wires.
These lugs should be crimped with a proper crimping tool.
Use the following wire colours for DC wiring (refer to local
rules):
Wire colour
Meaning
Must be connected to:
Red
Positive
+ (POS)
Black
Negative
–(NEG)
Position the positive and negative cables next to each
other to limit the electromagnetic field around the cables.
The negative cable should be connected directly to the
negative post of the battery bank or the load side of a
current shunt. Do not use the chassis frame or hull of the
ship as the negative conductor. Tighten the DC
connections securely (15 - 20 Nm / 130 - 175 In-Lbs.). The
positive battery cable must be fused and connected to the
positive post of the battery bank. Fuse rating depends on
the applied cable cross section.
5.3.3 AC safety grounding
WARNING
The ground wire offers protection only if the
cabinet of the Mass Combi Ultra is connected to
the safety ground.
The ground stud (M6) is positioned at the left side of the
cabinet, see page 2, position 12. Connect the earth
terminal (PE / GND) to the hull or the chassis with a
minimum 10 mm².
In some applications automatic connection between the
neutral conductor (N) and earth (PE / GND) is not required
or acceptable. Therefore the automatic connection
between the neutral conductor (N) and earth (PE / GND) is
disabled by default.
For safe installation it is necessary to insert a Residual
Current Device (earth leakage switch) of 30 mA in the AC
in and outputs of the Mass Combi Ultra. Refer to local
regulations on these issues!
5.4 Things you need
Make sure you have all the parts you need to install the
Mass Combi Ultra:
Mass Combi Ultra (included).
Battery temperature sensor with cable and plug
(included).
AC wiring. Double insulated three wire cable with wire
colours according to the locally applicable standards.
The applicable length and wire diameter depend on the
electrical installation. See section 5.3.1.
DC-wiring to connect the DC connections of the Mass
Combi Ultra to the DC-distribution; see section 5.3.2.
DC-fuse holder with a DC-fuse, to be integrated in the
positive DC-cable. For specifications see section 5.3.2.
Screws / bolts (Ø 6 mm) (with plugs) to mount the
cabinet to a surface. Use mounting materials which are
suitable to carry the weight of the Mass Combi Ultra.
Batteries. Refer to chapter 8 for specifications.
Appropriate and reliable cable terminals, cable lugs,
battery terminals and cord end terminals.
We recommend as a minimum tool kit:
Socket wrench 13 mm to fix the DC-input (battery)
cables.
Flat blade screw driver 1.0 x 4.0 mm to fix the screw
terminals.
Tools to fix the screws / bolts (Ø 6 mm) with plugs to
mount the cabinets to a surface.
Philips screw driver to open the connection area of the
Mass Combi Ultra.
5.5 Removal of the front lid
Figure 5-2: Removal of the front lid
Steps:
1 Loosen the two screws that secure the front cover
plate.
2 Lift the front cover plate from the cabinet; see
figure 5-3.

18
Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
Figure 5-3: Front lid removed
WARNING
The front panel must not be removed while the
Mass Combi Ultra is still connected to a power
source!
5.6 Mounting the cabinet to a surface
M6 bolts can be used for the mounting of the cabinet
vertically to a surface.
Take the following steps to mount the cabinet:
1 Determine for the four mounting spots on the basis of
the outline drawings and 150 mm of free space
required below the Mass Combi Ultra for installation
and DIP switch operation.
2 Screw the topmost bolts somewhat into the wall.
3 Hang the cabinet with its key holes over the two bolts
and screw these bolts finger tight, so shifting is still
possible.
4 Place the two lowermost bolts.
5 Fasten all bolts securely.
5.7 Wiring instructions
WARNING
Have installation work done by a licensed
electrician only. Before connecting the wiring,
make the AC distribution as well as the DC
distribution voltage free. Move the main switch
to the “Off”-position.
CAUTION!
Short circuiting or reversing polarity may lead to
serious damage to the batteries, the Mass
Combi Ultra, the solar panels, the wiring and/or
the terminal connections. Fuses between the
batteries and the Mass Combi Ultra cannot
prevent damage caused by reversed polarity.
The damage as a result of reverse polarity is not
covered by the warranty.
CAUTION!
Too-thin cables and/or loose connections can
cause dangerous overheating of the cables
and/or terminals. Therefore tighten all
connections well. Only use cables of the correct
size.

Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
19
5.8 Installation overview
Figure 5-4: Installation overview for one Mass Combi (stand-alone operation)
CAUTION!
Ensure correct polarities, cross sections and fuses for all wiring. An RCD according to local regulations must be
connected to output-1 and 2.
* Models 12/3000-150 and 24/3500-100 only
*

20
Mass Combi Ultra 12/3000-150, 24/3500-100, 48/3500-50 –User and Installation Manual
5.9 Setting up a MasterBus network
All devices that are suitable for MasterBus are
marked by the MasterBus symbol.
MasterBus is a fully decentralized data network for
communication between the different Mastervolt system
devices. It is CAN-bus based which has proven itself as a
reliable bus-system in automotive applications. MasterBus
is used as power management system for all connected
devices, such as the inverter, battery charger, generator
and many more. This enables communication between the
connected devices, for instance to start the generator when
the batteries are low. MasterBus reduces complexity of
electrical systems by using UTP patch cables. All system
components are simply chained together. Therefore each
device is equipped with two MasterBus data ports. As only
a few MasterBus cables are needed, installation and
material costs are reduced importantly.
New devices can be added to the existing network easily.
Consequently the MasterBus network is highly flexible for
extended system configuration. Mastervolt also offers
several interfaces like the Modbus interface, making even
non-MasterBus devices suitable to operate in the
MasterBus network. For central monitoring and control of
the connected devices Mastervolt offers different panels,
like the full colour MasterView System panel. All monitoring
panels can be used for monitoring, control and
configuration of all connected MasterBus equipment.
CAUTION!
Never connect a non-MasterBus device to the
MasterBus network directly! This will void
warranty of all MasterBus devices connected.
5.10 How to set up a MasterBus network
Every MasterBus device is equipped with two data ports.
When two or more devices are connected via these ports,
a local data network called the MasterBus is formed. Keep
the following rules in mind:
Place a terminating device on both network ends.
OK
Connections between the devices are made by
standard straight UTP patch cables.
OK
At least one device in the network must be MasterBus
powering (see specifications). As all powering devices
are galvanic isolated, multiple powering devices are
allowed.
OK
Do not make ring networks.
Do not make T-connections in the network.