Chint Power CPS SCA20KTL-DO Installation And Operation Manual page 105

Note 3: When the altitude is higher than 2000m, the operating temperature of
the inverter needs derating, as shown in Figure 8-3:
Figure 8-3 SCA20/25KTL derating curve with high altitude
Note 4: The inverter can output the AC power with full loads under 90%~110%
of the rated grid voltage. When the grid voltage is lower than 90%, the output
current will be limited within the allowable Max. current.
Po/Pn
100%
80%
60%
40%
20%
Figure 8-4 SCA20/25KTL derating curve of grid voltage
Tamb(℃)
60
45
2000 4000
Altitude(m)
0.9*Un
101
1.1*Un