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Also referred to as PV modules, these are the 'solar cell' part of a complete system.
The current and power output of photovoltaic modules are proportional to sunlight intensity. At a given intensity, a modules output current and operating voltage are determined by the characteristics of the load. If that load is, say for instance, a battery, then the batterys internal resistance will dictate the modules operating voltage. For example a module that is rated 17 volts will put out less than its rated power when used in a battery system. The working voltage would be more like 12 and 15 volts. As wattage is the product of "volts" times "amps". For example: a 50-watt module working at 13.0 volts will produce 39 watts (13.0 volts x 3 amps = 39 watts).
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