Tom,
Warren makes a good point that I'll build on here. Just because
someone asks for a particular output doesn't mean you should give it
to them!
If their desired gpd requires an extreme solution, Just Say No. If
you have to add a large battery bank and inverter in order to
achieve the desired goal, you have added all sorts of opportunities
for lack of proper care and maintenance to lead to premature
failure. There are plenty of systems in the less-developed countries
that sit there inoperational because the money's not there to
replace the prematurely failed batteries.
I would encourage you to run the pump array-direct only, with a
tracked array of maximum, optimized size (1,200 W?). What the pump
can produce in this setup is what can be done, period - likely
around 10K gpd. To attempt to exceed this invites eventual and
likely premature system failure. This just seems like the right time
to apply the KISS principle.
My $.02.
On 2/10/2011 8:17 AM, Warren Lauzon wrote:
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.
Sent: Thursday, February 10, 2011 6:59 AM
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
On Thu, Feb 10, 2011 at 5:29 AM,
Tom DeBates <habite...@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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