Electrical power generators, also known as alternators, transform mechanical energy into electrical energy. They can be used for backup or emergency power or as an alternator on board a vehicle. Generators can produce either AC or DC power and are typically powered by a fuel engine.
Selecting electrical power generators requires an analysis of inputs, outputs, and portability. Typically, smaller units are movable while large devices are mounted or fixed in one location. Inputs usually include conventional fuel sources such as gasoline, diesel, propane, and natural gas; however, some electrical power generators use alternative forms of energy such as solar and wind power. In terms of outputs, some electrical power generators provide single phase or three phase AC voltage. Other devices output DC power. For AC electrical power generators, important specifications include AC prime power rating, which is expressed in volt-amperes (VA). For DC devices, important specifications include DC power, which is expressed in watts (W). As a general principle, both AC and DC electrical power generators should not be operated at maximum power output for more than 30 minutes or for periods of time exceeding manufacturer recommendations.
Electrical power generators can be customized with a wide range of attachments, components, and performance options. These range from simple electromechanical devices to advanced digital microprocessor-based controls, remote communication capabilities, sound-attenuated and weather-protected enclosures, fuel tank bases, silencers, batteries, alternators, governors, air cleaners, starting aids, and cooling options Gasoline and diesel electrical power generators often feature reduced emissions, open and pre-chamber designs, fast-burn pistons, and low-overlap cams.
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