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Old 02-03-2010, 11:47 AM   #1
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Solar Installation


Hello all...I was trying to figure out what size of solar system I would need to run a water pump from a well to a 2000 gallon tank. Right now I use an 8000w generator to power it with 30Amps and takes about an hour and a half to fill. Its a 1HP 230v 16 S10-10 water pump. I also wanted to power a coupla circuits for lights and a tv during the weekends. Thanks for any advice!

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Old 02-03-2010, 12:37 PM   #2
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Solar Installation


You have several things to consider:

1. Your 1 HP water pump uses how many number of watts of power (746 if it is 100% efficient which it is not.)

2. You need to run it for how long in order to fill your 2000 gallon tank?

3. You need to fill this tank how often?

4. How many watts are your other loads?

These answers will help you determine how many joules or KWH of energy you need to store and how fast you need to recharge the storage. If your solar array is small you need more batteries, if your battery bank is small you need a larger solar array. Last is the ability of the solar panels that you choose to use to generate energy in your location which will be affected by climate, shade and latitude.

Bottom line is that this is not a back of the envelop calculation that you want to do. You need to consider a lot of variables before you decide on a set up.

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Old 02-03-2010, 12:58 PM   #3
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Solar Installation


That is a terribly complex question!

Electric motors need a "surge" of electricity to start up, then use less electricity to run.

A bit on electric motor "inrush current"...
http://findarticles.com/p/articles/m...8/ai_78573851/

So the solar system would need to be able to handle that surge.

Then the amount of light you get is how much electricity you get out of the solar panels. And this is different depending on where you are located...

Solar System Sizing calculation method...
http://www.ambassadorenergy.com/?page_id=35

Might want to ask a solar system dealer like this one...
http://store.solar-electric.com
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Old 02-03-2010, 01:16 PM   #4
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Solar Installation


Thanks trosenda...yeah this house is located in Az. so the sun hits pretty good. The tv uses 107 watts and lighting are a few 40w bulbs for a small ranch house. There is no electricity at the ranch and will only stay there on weekends..I have no clue bout the pump wattage but i know it was running off 30amps from the generator. We would need to fill it once a week.
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