How do I choose the correct solar panels for the water pump?
A. First, look on the manufacturer’s specifications for the particular pump and find the wattage. Let’s take 250W as an example. You will need 20% more then the pump requirement because the solar panels will produce less then their power rating with aging, dust accumulation, etc. So, for a 250W pump, you will need 300W from your panels (250 x .70). You could use four 75W panels (4 x 75 = 300) or two 150W panels.
