Q: Will the PV system installed be replacing completely the diesel generator?
A: The PV system installed is capable to supply the load demand without the help of the diesel generator if properly sized. In other words, if the number of panels is sufficient in order to supply the energy during the sunny days, and the capacity of batteries is enough to store the necessary energy needed during the night, the generator will not be used at all.
Q: For what purpose the NETMETERING is used?
A: The NETMETERING will replace the original EDL meter in order to give the customer the ability to use the excess energy supplied by the PV System by feeding this energy into the EDL grid. This option reduces the EDL bill cost (the cost can be nulled), thus optimizing the use of the PV system.
Q: Over a year, how many sunny days are there in Lebanon?
A: The number of sunny days depends on the location; it can vary from coastal areas, mountain areas and inland areas. According to the Lebanese Center for Energy Conversion (LCEC), on average the number of sunny days in Lebanon is 290 days per year and it can reach up to 310 days per year in Inland areas. Thus the location of Lebanon will help to increase the efficiency of the PV system installed by increasing its yield.
Q: What is the difference between “kW”, “kWp (kW Peak)” and “kWh”?
A: KW is the unit of electrical power, it is calculated by multiplying the electrical current by the voltage ( volt x Amps), while the KW p is the maximum power produced by the PV system, this power is reached at noon and it is proportional to the number and type of panels. KWh is the unit of electrical energy. In other words, it is the energy used during 1 hour. Example: consuming 2KW during 5 hours is equal to 10 KWh (2Kw x 2h).
Q: Does the PV system installed require any maintenance?
A: Like any electrical equipment, the PV system requires almost no maintenance. The dust on the panels can be removed, for example by spraying water. The inverters and batteries require little maintenance. For liquid electrolyte batteries, water should be added to the batteries if needed every 12 months for compensation.
Q: Does the Power of the Panel vary during the day?
A: The power of the panel is variable; it reaches its maximum at noon. It should be noted that the voltage is almost constant all over the day, while the current varies according to irradiation and the sun position with respect to the panel. As a rule the panel can gives over 90% of its optimal power for at least 5 hours per day.
Q: What are the Safety Precautions that should be taken into consideration?
A: As a whole the PV system is considered very safe. No danger to life or harm can occur by touching the panels. The casing of the inverters can be opened only by qualified personals.The indoor and outdoor cables are well insulated. Working with the cables should only be carried out by skilled persons who are aware of the danger like any normal electrical installation. PS: Touching a cable which is not insulated can lead to harmful consequences or death.