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The basics


A state-of-the-art electric system that is convenient to monitor

and operated intuitively, including links to the B&G navigation



High charging capacity: the entire service battery bank of six MLI

24/5000 (linked in parallel) charges up to 100% from the shore or

from the generator in a very short time.


Limited running time for the generator: two Alpha alternators

power the connected consumers in parallel with the battery

charging, further reducing the time that the generator is active.


The charging sources receive all required battery information

from the Lithium Ion batteries. This system is conceived to

preserve the battery: overcharging is prevented and even cable

losses are monitored and compensated during charging. This

results in a 100 % efficient load every time.


To save space, the battery charger, inverter and AC transfer

system are combined within one casing.


Due to the large loads, battery voltage is 24 V.


Navigation, system data monitoring and power electronics are

operated via a single display.



System choice


Inverter/charger: 3 x Mass Combi Ultra 24/3500-100

The system on board the Privateer Trawler 50 Bolwerk comprises three Mass

Combi Ultras connected in parallel, giving a total inverter capacity of 10.5 kW and

total battery charge of 300 amperes. Mastervolt’s Mass Combi Ultra is a battery

charger, inverter and AC transfer system in one. All energy sources, such as the

generator, shore power or batteries, can be connected. The Combi regulates

and distributes power automatically, seamlessly connecting the available power

sources. This ensures that the batteries are always charged and users can count

on a stable AC voltage on board.


Batteries: 7 x MLI Ultra 24/5000

(of which one for the sternthruster)

The high charging capacity of the system ensures that the entire user battery bank

of six MLI 24/5000 batteries connected in parallel (30 kWh/1080 Ah) can charge

to 100 % within a very short time. Thanks to the ingenious internal AC transfer

system included in the Mass Combi Ultra, the battery bank can also be charged

fully automatically, both from the shore and with the generator. This means that

Bolwerk has a kind of floating power plant on board. Lithium Ion technology was

also chosen for the sternthruster because of its low weight, small dimensions and

extremely high efficiency.