What power of diesel generator set is needed to start a water pump motor?

What power of diesel generator set is needed to start a water pump motor? 
Diesel generator sets are used as emergency backup power sources, and they are mostly employed as emergency power in situations where there is no municipal power supply, especially in the wild. Sometimes, water needs to be pumped using a water pump, but the motor of this water pump requires electricity. Its startup process is different from that of ordinary electrical equipment. Now, let's take a detailed look at the power configuration of the generator set required for the startup of the water pump motor. 
The starting current of a pump motor (also known as locked-rotor current or starting current) is typically 5 to 7 times its rated current, depending on the motor type and starting method. Here are the starting current ranges for different starting methods:
1. Direct Start (Full Voltage Start)
Starting Current: 5 to 7 times the rated current (most common)
Characteristics: High starting torque but large current surge, suitable for small power motors (generally ≤ 15 kW).
2. Star-Delta Start
Starting Current: 2 to 3 times the rated current (reduced by about 1/3 compared to direct start)
Characteristics: Starts in star configuration (reducing voltage) and switches to delta during operation, suitable for larger power motors (e.g., 30 kW and above).
3. Soft Starter (Electronic Type)
Starting Current: 2 to 4 times the rated current (adjustable)
Characteristics: Smooth start by controlling voltage or current slope, reducing mechanical and electrical shock.
4. Variable Frequency Start
Starting Current: 1 to 1.5 times the rated current (smoothest)
Characteristics: Soft start achieved through variable frequency speed control, with the smallest current but higher cost. 
Therefore, when you are choosing a diesel generator set to power a water pump motor, please calculate the required power and current of the diesel generator set in advance to avoid the situation where the starting current of the water pump motor is too large and the power of the diesel generator set is insufficient, making it unusable.
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