Reliable PV direct submersible? [RE-wrenches]

[Walt Ratterman]

Hello....

Walt Ratterman here.

I have done solar pumping projects in several developing countries - the
latest was the FATA area of NW Pakistan.  We too want to be sure the
systems work.....

Generally, the first step would be to see if your system size (by daily
water needs and dynamic head) put you in a range of a DC system pump and
controller.  If so, then you can feel comfortable with the products by
SunPUmps, Dankoff (now mainly Lorenz) and Grundfos.  All three
manufacturers have different areas where their pumps perform the best
(based on specific efficiencies, so check them all out...)  It is not
unusual to have these pumps in submersed for 10 to 15 years without a
problem in the pump.  The Grundfos and Lorenz models would be the
heliacal rotor pump.

Thanks,

Walt

-----Original Message-----
From: Mick Abraham [mailto:mick at abrahamsolar.com] 
Sent: Monday, February 26, 2007 7:01 PM
To: RE-wrenches at topica.com
Subject: Reliable PV direct submersible? [RE-wrenches]


Hi, Wrenchies~

A childhood friend just called me for help on a pumping system. His 
mechanical style windmill just got blown away due to high winds...again.

He's asked me about PV direct submersible pumping 700 to 1000 gpd, total

lift 120'.

Remember, this is my longtime friend whom I would like to keep as a 
friend. He is used to having pump problems once or twice a year but 
would like less trouble than that and would certainly not enjoy more 
trouble than that. As I review my history with PV direct pumping systems

it occurs to me that my clients have had frequent trouble with every 
major brand of pump/controller that I've worked with. That includes 
several major brands some of which were fairly expensive. I gave up 
entirely on this category several years ago, so I don't know the product

landscape very well any more.

Could any of you recommend a PV direct submersible system that would be 
highly reliable? Aerovironment's inverter solution with conventional 
pump looks good but seems cost prohibitive because of the high PV 
wattage required. I'm inclined to suggest the Grundfos SQFlex system 
this time. That's one that I've never had occasion to curse but also one

that I've never sold, so I hope to get opinions from List members with 
mud on their boots. 

I'm sorry to seem cynical but the past problems with this product 
category have stripped my gears. I definitely see the appropriateness of

PV direct pumping but I also need to stop selling things that break   
down. This pumping site is not close to my location so I need something 
with "set it and forget it" reliability.

Thanks all around,

Mick Abraham
Abraham Solar Equipment
Pagosa Springs, CO
www.abrahamsolar.com


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