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ATMOSPHERIC TEMPERATURE & HUMIDITY POWER LOSSES
These losses are generally considered to be nominal with values seldom exceeding 5%. Natural
atmospheric variations, however, can combine causing nearly 20% de-rating. For example, air of 120°F
(50°C) at 100% humidity. Even 100°F (40°C) temperature at 90% to 100% humidity will cause a 10%
de-rating. The local and/or field operating conditions must be evaluated and the power de-rated from
SAE J-1349 per these factors.
ACCESSORY POWER REQUIREMENTS
Additional power deductions should be made for any accessories that are installed. These deductions are
necessary to accurately identify the expected net power available for the prime power requirement. The
accessory items are variable for each installation / application, and can’t be determined or deducted by
the engine manufacturer. The following accessories are typical in a Stand-By Generator application.
Auxiliary Alternator / Generator End
Engine Alternator
Drive Belts and Pulleys
Cooling Fan
8
TEMPERATURE RELATIVE HUMIDITY
°C °F 30% 40% 50% 60% 70% 80% 90% 100%
25 77 1.000 .997 .992 .990 .984 .980 .977 .973
30 86 .985 .980 .973 .969 .964 .957 .954 .949
35 95 .966 .960 .953 .947 .940 .934 .928 .920
40 104 .948 .940 .931 .924 .915 .907 .899 .892
45 113 .928 .919 .907 .897 .886 .878 .867 .855
50 122 .910 .895 .882 .869 .854 .841 .830 .815
ATMOSPHERIC FACTORS CHART
POWER AVAILABLE DUE TO TEMPERATURE AND HUMIDITY VARIATIONS
57


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