Temperature Derating; Mppt - Sungrow SG2500-MV System Manual

System Manual
10.6

Temperature Derating

When the ambient temperature is below 45℃, the inverter can operates at 110% of the
overload condition. When the temperature reaches 50℃, inverter can keep the nominal
power output. When the temperature is above 60℃, inverter enters into protection mode.
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Note: Pn is the nominal power.
Ambient temp. T
T<-35℃
-35℃<T≤45℃
45℃<T≤50℃
50℃<T≤60℃
T>60℃
10.7

MPPT

Maximum Power Point Tracking (MPPT) is a technique that the inverter uses to get the
maximum power from the PV arrays. PV arrays have a complex relationship between solar
irradiation, temperature and total resistance that produces a non-linear output efficiency
known as the I-V curve.
P/Pn
1.2
1.1
1.0
Nominal value
0 25
Fig. 10-4 Inverter temperature derating function
Inverter operation situation
The inverter starts with the aid of auxiliary heater
Operate for a long time at 110% of the overload condition
Operate with derating at 2%Pn/℃
Operate with derating at 10%Pn℃
Enter protection mode;
Automatically restart when temperature drops below 55℃
10 Inverter Functions
L1 = 2%Pn/℃
L2 = 10%Pn/℃
Temperature (℃)
45 50 60
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