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8. Inverter Functions Operation Manual

T (℃)

1.0

1.1

0 5025 45

Nominal value

1.2

L1 = 2%Pn/℃

L2 = 10%Pn/℃

-35

P/Pn

Fig. 8-5 Inverter temperature derating function

Note: Pn is nominal power

Ambient temp. T

Inverter operation situation

T≤-35℃

Inverter needs to start with the aid of auxiliary heater

-35℃<T≤45℃

Operate for a long time at 110% of the overload condition

45℃<T≤50℃

Operate with derating at 2%Pn/℃

50℃<T≤60℃

Operate with derating at 10%Pn/℃

T>60℃

Enter into protection mode;

Automatically restart when temperature drops below 50℃

8.8 Maximum Power Point Tracking

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

Uoc

MPP

Current (A)

Voltage (V)

Power (W)

“I-V”curve

“P-V”curve

Fig. 8-6 I-V curve

Sungrow SG1250UD User Manual

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