Its biggest advantage is that it is virtually maintenance free and absolutely reliable, because of the absence of moving parts; it is designed for ease of assembly, use, and maintenance. Its yet another significant benefit is that it offers an option for nations to rid themselves of avoidable dependence on oil for fulfilling their gross energy needs. It is a nascent technology possessing the long-term potential to create additional jobs for a strengthening of economies. It does not generate hazardous waste or cause atmospheric pollution by a release of gases like carbon dioxide, sulfur dioxide, nitrous oxide or mercury like many traditional forms of electrical generation do. It does not require liquid or gaseous fuel to be transported or combusted. It does not contribute to global warming, acid rain or smog. Its far-reaching benefits outweigh the high initial cost of the systems. Innovations in product design in recent times have led to the feasibility of execution of maintenance of roof-mounted PV systems from ground level, without taking recourse to body harnesses, ladders, and cranes for accessing the roofs in compliance with the safety requirements. In colder countries where snow accumulation on roofs could pose a maintenance problem, safety and liability issues associated with jobs involving working at heights with slippery work surfaces have virtually been dispensed with. Contrarily, in hotter tropical countries, where accumulations of dust and foreign matter over the PV solar panels pose a severe maintenance problem, it has been intelligently resolved by providing them with dust-repellant coatings and by mechanisms for auto-blowing of the dust periodically. High wind velocities are known to cause problems of stability of solar arrays. Gyro-controlled hydro-electronic devices engineered with dual axis tracking systems to align the arrays in a horizontal position to allow the flow of air above and below them in cyclonic weather has resulted in protecting them against undesirable stresses for enhanced reliability. Research and advanced technology have also made it possible for the solar arrays to align themselves with the trajectory of the Sun’s path so that the Sun’s rays are always incident upon them, leading to enhanced performance of the PV systems with the advent of similar control mechanisms. Functional and operational needs have led to the broad categorization of PV systems into two types - Stand Alone and Grid-Connected. As the name itself suggests, the former type of PV systems are ideally suited for DC and/or AC electrical loads and have established their reliability for daylight hour applications like water pumps, ventilation fans, small circulation pumps for solar thermal water heating systems and ventilation blowers etc. which are designed to operate independent of the electric utility grid; however, batteries could be used for energy storage, if deemed necessary, for specific end applications. Solardirect.com talks of the reliability of consistent AC voltage and power quality required by any utility grid is assured by the DC power generating PV arrays, which receive the energy feed from the core component of the latter type of Grid-Connected PV systems called the Inverter.
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An author of the essay "Photovoltaic Solar Cells: Alternate Energy Sources for Electricity Generation" claims that innovations in product design in recent times have led to the feasibility of execution of maintenance of roof-mounted PV systems from ground level…
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