Technical data 135
Altitude derating
At altitudes from 1000 to 4000 m (3300 to 13123 ft) above sea level, the derating is 1% for
every 100 m (328 ft). If ambient temperature is below +40 °C (+104 .°F), the derating can
be reduced by 1.5% for every 1 °C reduction in temperature. For a more accurate
derating, use the DriveSize PC tool. A few altitude derating curves are shown below.
Derating factor 1.00
Derating factor 0.95
Derating factor 0.9
Derating factor 0.85
Derating factor 0.80
1500 m
1000 m
+25 °C +30 °C
+77 °F +86 °F
Ambient temperature
+40 °C
+104 °F
+35 °C
+95 °F
+20 °C
+68 °F
3300 ft
4921 ft
2000 m
6562 ft
2500 m
8202 ft
3000 m
9842 ft
3500 m
11429 ft
4000 m
13123 ft
Installation site altitude
1.00
0.95
0.85
0.90
0.80
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