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#littleinch, thank you for your response For your questions when the the gatevalve through suction side opened fully the pump not start running and it trips the motor. But when the gate valve through suction side is closed by 1/4 of full close the pump will run. What is the reason for such...

Hello everyone, I have a a single stage pump which deliver 89 L/s at head of 113m and the pump is not start unless you close a quarter of gate valve through suction side.why does this pump refuse to start unless its quarter valve is closed through suction side

@Enzoaus thank you very much, it's the best information.there is also https://www.grundfos.com/ which is used to size a solar water pump.

@LittleInch thank you so much for your response, its what I wanted and was very helpful.

@itsmoked thank you for your response, but I couldn't find prerecorded data for specific location in Ethiopia, that I am going to design for. Do you know any useful software that may help me in approximating the panel generating factor based on a given coordinate?

to size, the photovoltaic (PV) modules require panel generating factors. how can I get it for Ethiopia or East African country?