Diesel generator
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A diesel generator is the combination of a diesel engine with an electrical generator (often called an alternator) to generate electric energy.
Diesel generators are used in places without connection to the power grid or as emergency power-supply if the grid fails. Small portable diesel generators range from about 1kVA to 10kVA, while the larger industrial generators can range from 8kVA - 30kVA for homes, small shops & offices up to 2000kVA used for large office complexes, factories and power stations.
A Well known Diesel Generator distributor is named "Forest City" who have been in the industry since 1902 one of the oldest companies around. [[1]]
Ships often also employ diesel generators, sometimes not only to provide energy for electric systems, but also for propulsion. The use of diesel generators for propulsion is actually becoming more common due to the fact that in this arrangement the generators do not need to be close to the propeller and instead they can be placed in better positions, usually allowing more cargo to be carried. Such a diesel-electric arrangement is also used in some very large land vehicles.
Power generators are selected based on the load they are intended to supply power for, and that load's "mission critical" needs (i.e. a hospitial needs to have 100% redundancy and up-time, your backyard standby unit to keep a hot tub warm isn't nearly as critical)