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Old 02-22-2010, 12:18 PM   #1
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Submersibe pump

I have an existing water well pump 390ft. deep and the water level is at 386ft. It is a Grundfos 16s10-10, 1HP 230v 3-wire submersible pump.

Currently we power it with an 8000w generator, but want to run it on solar instead. Located in Northern Az. where it is always sunny, we wanted to run it at least 6hrs a day everyday to fill a 2,000 gallon tank, with overflow to irrigate.

Anyone have any suggestions on what solar system to purchase?

Where does the solar power go once the batteries get full and there is no grid or poco?

Thank you for your time!


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Old 02-22-2010, 01:13 PM   #2
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One horse power is considered to be equal to 746 watts!

You will require an inverter thats capable of providing at least this much! Probably a 1000 watt inverter, that provides 220 volts.
You will require a string of battery's to power the inverter. You would not want the pump to stop and start every time a cloud happened to pass by.
The number of battery's would depend on how long you want the pump to run, without the sun shining.
The solar collector if it produces 12 volts would have to provide 746 watts for the pump and some extra for controls and heat loss's, so for sake of argument 1000 watts are required, you would need a solar array that will produce about 85 amps. I(current)=P(wattage)/V(voltage) Amps=1000/12=85

I'm not an engineer, so I'll be looking forward to comments from others. I had to go back to my high school days to come up with this theory!


Last edited by Wildie; 02-22-2010 at 01:16 PM.
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Old 02-25-2010, 10:17 PM   #3
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I wouldn't run a submersible pump motor from an inverter unless it was a true sine wave type.

These motors are pretty high-strung, and won't tolerate distorted waveforms common to most inverters.

If you can find a true sine wave inverter, the motor will use about 1200 watts when running, and about 10,000 watts to start.

When a solar system has fully charged the batteries, it simply doesn't produce any more power than it needs to. Voltage at the panels goes up, and current goes down. It sort of rests.

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Old 02-26-2010, 09:27 AM   #4
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I wonder if its possible to buy a D.C. submersible pump?

This would save the conversion using an inverter!

Of course, this would increase the maintenance costs!
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