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OFFSHORE

THE FLIDAR SYSTEM

A crucial decision for this application was the type of batteries

to be used.

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Batteries: 12 x MLI Ultra 24/5000

Lithium Ion technology was chosen for its low weight, volume

and, most importantly, extremely high ‘round-trip efficiency’.

Storing energy in these batteries and subsequently using that

same energy for the onboard consumers has an efficiency

of > 90 %, meaning that energy losses are reduced by up

to a factor of three compared to traditional batteries. To

ensure the FLiDAR buoy will maintain its measurements and

communication even during periods of cloudy days and little

wind, it was decided to install two battery banks each of six

MLI Ultra 24/5000s with a combined capacity of 60 kWh. This

battery capacity means the buoy can operate for approx. two-

week periods with no sun or wind at all, or a period of two

months of average wind and no sun.

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Digital distribution

To remotely monitor and control the various onboard energy

sources and consumers, all necessary system information is

combined using MasterBus. A combination of digital switching

products and Tank Level Interfaces (measuring current

through a custom interface) ensures that all power flows are

measured and switchable while environmental properties like

temperature and humidity are also calculated.

For redundancy purposes, the two battery banks can be

separately switched by using 500 A safety relays controlled

by Multipurpose Contact Output interfaces. This can all be

done remotely by the integration of a GPRS Module in the

MasterBus system.

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2 x MasterShunt 500

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2 x DC Distribution 500

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8 x Digital DC 10x10A

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20 x MasterBus Tank Level Interface

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1 x Digital Input

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1 x GPRS Module

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4 x Multipurpose Contact Output

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Voltage conversion: 5 x DC Master24/12-12A

The 24 V consumers are supplied directly by the batteries, a

set of five DC Master 24/12 (DC-DC converters) convert the

voltage to supply the 12 V consumers.

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Battery charger: 3 x ChargeMaster 24/100

The buoy can be plugged into the grid when not at

sea, charging the MLI Ultra batteries through a set of

ChargeMaster battery chargers.

System choice

Other system components

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8 x SCM25 MPPT solar charge regulator;

to efficiently charge the Lithium Ion batteries via

the solar panels.

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14 x safety relay 500 A

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2 x Pro Installer 400A EZ-Mount on/off battery

switch

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