Hey Dan;
If this just problem just started, I'm with Drake, you could have a
premature cell failure. I also agree with Allan, 2 wire pumps are
certainly problematic on inverters. Many well service folks don't even
install them because they don't last near as long as 3 wire pumps, so
your customer may end up needing to replace the pump soon anyway.
We've used the Franklin Sub Drive with a 1.5 Hp Pump that would start on
an SW 4024, but not on an Outback VFX3524. Worked well, no call backs.
I'm not sure if they will work with a 2 wire pump though.
Before you take that long trip, have the customer check individual
battery voltages while the pump is running.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 12/10/2016 3:43 PM, [email protected] wrote:
Have you checked the condition of the batteries. Unless the L-16s are
Rolls or East Penn, it might be about time for some cells to be going
bad.
----- Original Message -----
From:
"RE-wrenches" <[email protected]>
To:
"RE-wrenches" <[email protected]>
Cc:
Sent:
Sat, 10 Dec 2016 10:39:30 -0700
Subject:
Re: [RE-wrenches] Retrofit variable speed drive to old well pump?
Michael; Battery bank voltage at 75% SOC is around 24.7v, so it's
in the ballpark and the battery bank has only about 3 years on it
(8 x L-16) and not much abuse.
Dan Fink
Adjunct Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342
On Sat, Dec 10, 2016 at 10:34 AM, Shasta Daiku
<[email protected] <mailto:[email protected]>> wrote:
What is the battery voltage when the client says that SOC is %75?
VFD driven pumps are three phase. There are single phase “soft
start” controllers for pumps and motors designed for that
application, but not for a two wire fed submersible pump. The
pump, for mechanical reasons, not just electrical, may may be
resisting start up.
Michael
On Dec 10, 2016, at 9:11 AM, Dan Fink <[email protected]
<mailto:[email protected]>> wrote:
Hi Bob; I checked the connections for corrosion, and the
wire size looks like "the usual" for up here in this area,
it's only about 100 feet and the usual well depth around
here is 350 ft. Running stouter wire might be an option to
consider...but that's a lot of digging. I'm just hoping
VSD might be a quick and dirty solution.
Dan Fink
Adjunct Professor of Solar Energy Technology, Scotch
Institute be
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342
On Sat, Dec 10, 2016 at 9:53 AM, RE Ellison
<[email protected] <mailto:[email protected]>> wrote:
Don't know about the variable speed but are the wires
feeding the pump large enough for the distance?
Sounds like it might be voltage starved because of a
high resistance / bad connection or a long wire run
and the need for a larger wire ?
Just a thought,
Bob Ellison
On Dec 10, 2016, at 11:39 AM, Dan Fink
<[email protected] <mailto:[email protected]>> wrote:
Esteemed Wrenches;
I have a client in a very remote mountain location
who is having trouble with his inverter starting
his well pump when battery state of charge is
below 75%. 24v system, Magnum inverter.
It's a 2-wire pump, unknown age, model,
horsepower, or well depth. It has always given him
trouble, that's why he upgraded to 24v, and the
situation is better, but not ideal yet. I don't
think adding a hard start capacitor would help as
there should be one inside the pump itself, though
I suppose it could be blown.
Because of the distance and the rough road, it
would be super expensive for a well company to
come up there, pull the old pump and set a new,
modern soft-start one.
Has anyone here had any experience with
retrofitting variable speed drive units to an
unknown pump? If so, what models have you tried
and what do you prefer?
Thanks;
Dan Fink
Adjunct Professor of Solar Energy Technology,
Ecotech Institute
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342
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