These loads are, for example, the motors
in air conditioning systems and diving
compressors. They cause the current
to flow out of phase with the voltage, a
phenomenon also known as phase shift.
The degree is indicated by a value, cos
phi or power factor, which ranges from
0 to 1 and is inversely proportionate to
the size of the lag. In a heating element
(which is resistive load), current flows in
step with voltage and cos phi is 1. In a
motor, however, there will be a lag, as
indicated by the typical value of 0.8 - or
sometimes 0.6 - for cos phi. The lower the
cos phi, the greater the lag, and the more
current is necessary to supply a given
level of power.
Converts 12, 24 or 48 volt battery power
to alternating current at 230 V/50 Hz (or
120 V/60 Hz). This allows appliances such
as computers, microwave ovens and TVs
to be powered without the need for a
grid connection or generator.
Converts shore power voltage to a higher,
lower or equal value to ensure that there
is galvanic isolation between the shore
power connection and the onboard
electrical system. This prevents corrosion
and increases safety.
Unit for electrical power
equivalent to 1000 watt.
Ten 100-watt light bulbs consume one
One kW of electricity used in one hour.
This is the most common measurement
of power consumption.
LED (light emitting
Electronic light with very low
power consumption. LEDs are generally
available in many different colours and
sizes. Mastervolt uses them as signal
lights on battery chargers and inverters.
NiCad batteries will soon be banned
because of their cadmium content.
N.B. All NiCad batteries are considered
to be chemical waste.
NMEA 2000 is a plug & play com-
munications standard used for
connecting marine equipment and
displays within boats. Communica-
tion runs at 250 kb-per-second and
allows any device to talk to any dis-
play, or other device compatible with
NMEA 2000 protocols. NMEA 2000 is
compatible with the J1939 CANbus
on road vehi-
cles and fuel
Power consumed by an inverter
when it is not powering any
equipment. This is just a few watts
with modern Mastervolt inverters
and Combis. The lower the no-load
consumption, the less power is used
by the inverter.
Unit for electrical resistance,
indicated by the symbol Ω. The
electrical resistance of an electrical
conductor is the opposition to
the passage of an electric current
through that conductor.
Gives the relationship
between voltage (U),
current (I) and resistance (R). In
formula terms this is expressed
U= I x R
. If two of the three
values are known, the third can be
The latest generation of LEDs can be
used as lights as well and are very low in
use of energy.
Lithium Ion battery
Lithium Ion batteries have a high
energy density and are perfect for cyclic
applications. Compared to traditional
lead-acid batteries, Lithium Ion batteries
offer savings of up to 70 % in volume and
weight, while the number of charging
cycles is three times as large. Another
major benefit of the Mastervolt Lithium
Ion battery is that it is equipped with an
integrated Battery Management System.
The system keeps all the individual cells
perfectly balanced, and ensures a long
Lloyd’s Register of Shipping is a British
classification society for yachts,
professional shipping, drilling platforms,
etcetera. Numerous insurance companies
require large vessels to be approved by
Lloyd’s. This means
that the vessel
and the onboard
to satisfy stringent
MasterBus is Mastervolt’s
advanced standard for
data communication and integration
of Mastervolt components within your
electric system. Advantages include
complete system integration, easy
operation and monitoring, and simple
network can be
easily extended in
a later stage.
Containing nickel and
cadmium, this type of battery is
unsuitable for use on boats due to the high
charge voltage required.