We install a 660 Watt photovoltaic system for security lighting at a training centre in Prey Veng, Cambodia. The polycrystalline silicon solar panels are from Mitsubishi Electric Corporation, PV-MF110EC4 gopen circuit voltage of 21.2V, and short circuit current of 7.16A. Its Vmax is 17.1V and Imax is 6.43A. The solar panels are mounted on a flat roof above the factory building. The batteries used are 4 deep cycled battery, each 100 A-hr operating at 24Vdc. The solar panel, each giving a rated peak power of 110W.
A total of 16 lamps, each comprising of two 3 watts LEDs with electronic switching mounted in a weather proof outdoor lamp casing. The lamp is designed to operate at 5 watts, giving it an equal brightness of a 40 Watt incandescent lamp. These lamps provide security lighting around the factory building and the 6 houses in the compound.
Charging and monitoring of the batteries are provided by a charge controller, Morning Star Prostar 30. Wiring for the system uses a 6mm diameter copper wire which will provide minimum voltage drop losses along the wiring. The wires are places in a pvc conduit.
We have a build-in timer switch (12 hours) which automatically switch off the lights 12 hours later if the user forgot to switch it of during the day time.
