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Junior Varsity
Experience running off diesel generators
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<blockquote data-quote="Rob Timmerman" data-source="post: 97688" data-attributes="member: 172"><p>Re: Experience running off diesel generators</p><p></p><p></p><p></p><p>kVA x pf = kW. The generator windings do not produce watts, they produce a current at a voltage (VA) at a specific phase angle relative to a reference. Ratings in kW may be provided as a convenience, but they always assume a power factor (typically 0.8) that may or may not reflect the actual load. An example of where the actual pf may be lower is with large banks of cheap SMPS units (this includes certain lighting loads). In such cases, it is more appropriate to use the kVA rating vs. the kW rating (both should be provided). For the entertainment world, this means that large intelligent/LED lighting rigs may require larger generators than you might initially expect.</p><p></p><p>Derating by 1/3 for single-phase operation makes sense, as you end up only using 2 of the three phases from the generator (with some transformer trickery to shift one of the phases by 30 degrees so that the 2 hot legs are 180 degrees out of phase vs. 120). Note that this is really 2-phase power, not the single-phase center tap that is typically seen in utility feeds.</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 97688, member: 172"] Re: Experience running off diesel generators kVA x pf = kW. The generator windings do not produce watts, they produce a current at a voltage (VA) at a specific phase angle relative to a reference. Ratings in kW may be provided as a convenience, but they always assume a power factor (typically 0.8) that may or may not reflect the actual load. An example of where the actual pf may be lower is with large banks of cheap SMPS units (this includes certain lighting loads). In such cases, it is more appropriate to use the kVA rating vs. the kW rating (both should be provided). For the entertainment world, this means that large intelligent/LED lighting rigs may require larger generators than you might initially expect. Derating by 1/3 for single-phase operation makes sense, as you end up only using 2 of the three phases from the generator (with some transformer trickery to shift one of the phases by 30 degrees so that the 2 hot legs are 180 degrees out of phase vs. 120). Note that this is really 2-phase power, not the single-phase center tap that is typically seen in utility feeds. [/QUOTE]
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Experience running off diesel generators
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