Generator Derating - Wacker Neuson GP2500A Manuel D'utilisation

Operation
CO detectors/ Install CO detectors/alarms in all areas that may be occupied by people or animals
alarms
while the generator is operating. CO detectors/alarms provide an extra measure of
protection against this poison that you cannot see or smell.
Install battery-operated CO detectors/alarms or plug-in CO detectors/alarms with
battery backup, according to the manufacturer's instructions. CO detectors/alarms
should be certified to the requirements of the latest safety standards (UL 2034,
IAS 6-96, or CSA 6.19.01). Test the CO detector/alarm batteries regularly
according to the manufacturer's instructions.
4.8

Generator Derating

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)
Derate
3 %
6 %
9 %
12 %
Derate
3 %
6 %
9 %
12 %
15 %
18 %
32
GP
Factor
0.97
0.94
0.91
0.88
Factor
0.97
0.94
0.91
0.88
0.85
0.82
wc_tx004573gb.fm