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Zawartość zarchiwizowana w dniu 2022-12-27

AUTONOMOUS PV/BATTERY POWER FOR AN UNMANNED LIGHTHOUSE (LITHARI)

Cel

To demonstrate the reliable operation of a PV/Battery powered flashing beacon lighthouse in Greece. The old system with a revolving oil lamp, which operated using counter weights that are raised by hand, has been replaced by four static flashing beacons.
The commissioning took place in July 1989. The system is perfectly working. After four years of operation the installation is in an excellent condition, showing that solar energy is a reliable source for such practically inaccessible isolated sites.
The unit energy cost is evaluated to be 8.2 ECU/kWh for the demonstration project and 3.4 ECU/kWh for a replication. DIESEL generation costs at such a site are of the order of 2.4 ECU/kWh.
The project demonstrates a novel flashing beacon for use in lighthouses powered by PV. The approach reduces running costs both by saving fuel and by eliminating the need for personnel on site. The old oil lamps required manual winding erery 1.5 hours, the lighthouse is located 96 m above sea a level in an inaccessible location (longitude 24 deg. 40'E, latitude 38 deg. 46'N). Three people were continuously in attendance to operate the old system with a total of 6 persons working in shifts.
Number of subsystems : 3
Power of subsystems : 4.7 kWp
Total power : 4.7 kWp
Number of modules : 36 (SM144-09) + 8 (SM144+36)
Module description : 36 Siemens type SM 144-09 A2, 144 monocrystalline SI cells of 10 cm diameter (18 s8p configuration), 130 Wp each, 1.02x1.47m. Furthermore five SM144-36 (72s2p-configuration) as power supply of the monitoring system and three further SM144-36 for
auxiliary functions.
Connection : 9 parallel strings of 4 series connected modules.
Support : on two racks 60 deg. fixed tilt, (optimized for winter operation).
Max. power tracker : together with charge controller.
Charge controller : The DC/DC converter consists of a central control section (including MPPT) and 4 power sections 1700 W each.
Battery Volt. : 48 V; VARTA
. Battery capacity : 2520 Ah. (10 days autonomy).
Battery capacity : 120 kWh. (100 h discharge). (Battery dimensioned for 300 A peak current).
Inverter : none
Load description : Four static flasing beacons with 500 W each (48 V), (two emitting towards SE, one towards NE, one towards SW, 3 light pulses of 1 sec, separated by 1 sec pauses, followed by dark interval of 20 sec). Daily consumption for 14 hours daily operating time:
14*0.240 = 3.4 kWh/d. (Supplier: AUTOMATIC POWER, GB).
Monitoring : Rugged data logger system with separate power supply: 5 parallel modules SM 144-36 and 525 Ah battery, 24 V. The final report on system monitoring (JRC, Blaesser, 12.7.93) is available:"... the results from monitoring indicate that sizing and utilisation of the installation are well matched..."

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Koordynator

DEMOCRITUS UNIVERSITY OF THRACE
Wkład UE
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Adres
POLYTECHNIC SCHOOL
67100 Xanthi
Grecja

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