THE FLIDAR SYSTEM
A crucial decision for this application was the type of batteries
to be used.
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.
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
2 x MasterShunt 500
2 x DC Distribution 500
8 x Digital DC 10x10A
20 x MasterBus Tank Level Interface
1 x Digital Input
1 x GPRS Module
4 x Multipurpose Contact Output
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.
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.
Other system components
8 x SCM25 MPPT solar charge regulator;
to efficiently charge the Lithium Ion batteries via
the solar panels.
14 x safety relay 500 A
2 x Pro Installer 400A EZ-Mount on/off battery