By S C Bhatia
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Extra resources for Advanced renewable energy sources. Part - I
Solar electricity is not produced at night and is greatly reduced in cloudy conditions requiring alternate sources of power. While many buildings with photovoltaic arrays are tied into the power grid which absorbs any excess electricity generated throughout the day and provides electricity in the evening, such systems use a grid tie inverter to convert direct current (DC) alternating current (AC) incurring an energy loss of 4–12 per cent. Off-grid systems use either storage batteries which also incur significant energy losses and require regular maintenance or enginegenerators which consume costly fuel.
5 Hour angle The hour angle is one of the coordinates used in the equatorial coordinate system to give the position of a point on the celestial sphere. The hour angle of a point is the angle between two planes: one containing the earth’s axis and the zenith (the meridian plane), and the other containing the earth’s axis and the given point. The angle is negative east of the meridian plane and positive west of the meridian plane or it can be positive westward zero to 360 degrees.
Barriers to further solar generation include the high price of making solar cells and reliance on weather patterns to generate electricity. Also, current solar generation does not produce electricity at night, which is a particular problem in high northern and southern latitude countries; energy demand is highest in winter, while availability of solar energy is lowest. This could be overcome by buying power from countries closer to the equator during winter months, and may also be addressed with technological developments like Infrared Solar Panel systems, which can capture energy in cloudy conditions and even at night.
Advanced renewable energy sources. Part - I by S C Bhatia