[RE-wrenches] Lorentz Sub Pump

Wed Apr 21 15:47:26 PDT 2010

We had about a 50% failure rate with Lorentz pumps and controllers and
stopped installing them, as Allan said "back when."

The Grundfos SQ Flex pump has been our choice and not even 1 bad one
yet and same pump for DC and AC. Pretty bomber Pump.

I would be glad to hear that they got it all sorted out.

Thanks,  Dana Orzel

Great Solar Works, Inc

web - www.solarwork.com

E - dana at solarwork.com

V - 970.626.5253

F - 970.626.4140

C - 970.209.4076

"We have been slow to give up on the myth of the Earth's generosity.

Rather grandly, we have overdrawn our accounts."

Barbara Kingsolver - Water is life.

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Allan
Sindelar
Sent: Wednesday, April 21, 2010 4:41 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Lorentz Sub Pump

We were burned pretty well by the period of bad Lorentzes and vowed
never again. Given the long time and close relationship between Windy
and myself, that wasn't decided lightly. Given Chris' and Jeff's
posts, I'm willing to cautiously reconsider.

Dave, you need to find out the vintage of the pump you're dealing
with. Our bad ones were around 2003-5, then we stopped using them.

I think the problem wasn't with the stator, as I never saw motor
failure. Rather, either the rubber compound or the manufacturing
tolerances/coefficient of expansion on the helical rotor surround were
off, causing failure. Also, a few controllers failed.

I'm surprised I've not yet seen a problem with the SQFlex yet.
Allan

Allan Sindelar
 <mailto:Allan at positiveenergysolar.com> Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com <http://www.positiveenergysolar.com/> 

Chris Worcester wrote: 

Hi Dave,

We have lots of the Lorentz systems in the field operating either from
PV direct, battery based or AC. I like them, and find them very
reliable. You need to check that the pump is matched to the well's
statistics. Did they install the low water sensor with the pump?

Sincerely,

Chris Worcester

Solar Wind Works
NABCEP Certified PV Installer
Phone: 530-582-4503
Fax: 530-582-4603
www.solarwindworks.com <http://www.solarwindworks.com/> 
chris at solarwindworks.com
"Proven Energy Solutions"

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Dave
Palumbo
Sent: Monday, April 19, 2010 12:41 PM
To: 'Wrench List'
Subject: Re: [RE-wrenches] Lorentz Sub Pump

Wrenchers,

Looking for advice on the following pump. Lorentz PS600-HR04H-1-48B
with power pack option and controller.  

I will be doing an off-grid system for a homeowner who already who had
purchased this pump, in fact it is down the well already, although not
working, or even  wired to anything yet. The dealer who sold her this
pump is no longer working this job. That dealer did not install
anything else. So, we have a clean slate except for this pump.

Homeowner is willing to go with another pump if I'm not satisfied of
this pumps quality, suitability for her home and reliability. 

I have never used a Lorentz pump before. I do recall some mixed
reviews over the years on this list on Lorentz pumps. 

Typically for a home like this (modest water needs) I would install a
Grundfos SQ AC pump with a standard pressure tank and run it off the
inverter. 

We could do a 48 volt battery bank for this home, so we could do the
Lorentz pump. This pump is designed to be powered with 48VDC nominal
correct?

Is it a reliable pump? 

Or will it be more trouble than the AC Grundfos?

Thanks,

Dave

David Palumbo, NABCEP Certified PV Installer

Independent Power LLC

Offices in Lamoille and the Champlain Valley

802.888.7194 

www.independentpowerllc.com 

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