[RE-wrenches] PV water pumping

[penobscotsolar at midmaine.com]

Tom,
    You might consider just using an SQ-O series Grundfos pump. They
operate at 120 VAC (or 240, 
depending on the model) and have the capability of pumping up to 10 GPM.
You could buy two for the 
cost of one SQ Flex and have the other as a backup. I use one of these at
my (solar powered) home and 
have had no problems for the last six years since I installed it.
    FYI, I have had 18 solar panels stuck in customs for the last TEN
MONTHS in Haiti, so leave yourself 
plenty of time for that installation.......

Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design

Original Message:
-----------------
From: Phil Undercuffler solarphil at gmail.com
Date: Thu, 10 Feb 2011 05:59:22 -0800
To: re-wrenches at lists.re-wrenches.org
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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