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Idiomas disponibles
5.4 GENERATOR DERATING
5.5 GROUNDING THE GENERATOR
PORTABLE GENERATOR
All generators are subject to derating for altitude and temperature. Internal combustion
engines, unless modified, run less efficiently at higher altitudes due to the reduction of air
pressure. This translates into a lack of power and thus reduction in generator output.
Temperature affects both engine and generator performance. As temperature increases,
an engine will run less efficiently and more resistance will be found in electrical
components. Therefore, as the temperature increases, the output of the generator
decreases. Altitude also affects the cooling capacity of air—the higher the altitude the
less dense the air is and thus the lower its ability to transfer heat.
For every increase in altitude of 500 m (1650 ft.) above 1000 m (3300 ft.), the output of
the generator will be reduced by 3%. For every increase of 5° C (9° F) in ambient
temperature above 40° C (104° F), the output of the generator will be reduced by 3%.
Use the tables shown for altitude and temperature deration factors. It may be necessary
to consider both altitude and ambient temperature deration factors to determine true
generator output.
Ambient
Temperature °C (°F)
45 (113)
50 (122)
55 (131)
60 (140)
Altitude m (ft)
1500 (4900)
2000 (6600)
2500 (8200)
3000 (9900)
3500 (11500)
4000 (13100)
A ground connection (a) is located on the control panel. For proper operating safety, this
ground terminal must be connected to a good ground source. This ground connection
must comply with National Electrical Code standards, and state and local regulations.
Derate
Factor
3 %
0.97
6 %
0.94
9 %
0.91
12 %
0.88
Derate
Factor
3 %
0.97
6 %
0.94
9 %
0.91
12 %
0.88
15 %
0.85
18 %
0.82
en
GEEL 2i
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