A PV system delivers power to a DC motor that in turn feeds a water pump. The DC motor is rated for 1.0 kW and is 85% efficient. Each PV module has 36 solar cells, arranged in a 9 x 4 matrix. The cell size is 125 mm x 125 mm and cell efficiency is 12%. Calculate the number of modules required in the array. Assume global radiation incidence normal to the panel to be 1.0 kW/m2.

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).