[RE-wrenches] PV water pumping

[Warren Lauzon]

The SQ-Flex can run directly from a high voltage battery/PV system, but with a battery based system at over 60 volts or so, you have a lot of problems finding a good charge controller.

So, even with the associated losses you are going to get with an inverter system, that is probably the only good option.

But I would also advise that systems such as that, especially those involving a large battery capacity, are very highly subject to failure through mis-operation, poor maintenance, and outright theft in many 3rd world countries, so if you end up designing the system keep that in mind.

From: Phil Undercuffler 
Sent: Thursday, February 10, 2011 6:59 AM
To: RE-wrenches 
Subject: Re: [RE-wrenches] PV water pumping

Tom, 


It can be done, depending upon how deep the static water level is and what additional lift or pressurization needs to be overcome.  


The SQ-Flex will run at highest capacity off an AC source, so I'd consider using an inverter system and grid power, with additional solar designed to supplement the grid.  You can run the SQ-Flex off a 120v source, so a single inverter works fine.  I run my Flex off my FX2024 along with all my regular household loads, no problems.


Size the array to cover the load through the longest expected grid outage (minimum) or you can size the solar to provide the majority of the power, and use the grid as "bonus" energy or to cover up for sizing shortages or the inevitable load creep.  


Phil Undercuffler 

"imagine if..."
  






On Thu, Feb 10, 2011 at 5:29 AM, Tom DeBates <habitek83 at yahoo.com> wrote:

        hello Wrenches,
          I have an organization in Haiti that I have assisted with PV projects in the past. They drill public wells and have a well (4" casing) that they would like to pump with PV. Problem (one) is that well will draw at ~ 20 gpm and they want ~ 25,000 gpd from the well. I have tried to look at every option I can and it looks like a battery bank will be necessary and an inverter ( 48 volt battery bank) to pump at the rate required. OOPPs, forgot they want to use a Grundfos SQ Flex pump, 16-SQF-10. The gird is "present".....very erratic and stressed, of course. They really would not like to stress gird further and do not want to add a generator. Yep, they made this easy. There are more details, but has anyone designed a PV water pumping system under these constraints and, if so, what have been your results?
        thanks,
        tom

        Tom DeBates
        Habi-Tek
        524 Summit St.
        Geneva,IL. 60134
        630-262-8193
        fax 630-262-1343 


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