Dan,
I have never had to work with a two-wire pump, so I'm on shaky ground
here, but I refer back to what I learned years ago from Windy. The third
wire in a three-wire pump carries the starting surge from the capacitor.
A two-wire pump lacks this, and thus gets its entire surge-under-load
from the AC source. This will be intrinsically difficult for an
inverter, as compared to grid. So Shasta's surge question below is
relevant. I'd determine both instantaneous surge and voltage drop; it
may be that the combination - of battery voltage leading to reduced AC
from the Magnum, voltage drop on the wires, and simply using the Magnum
- will keep it always problematic.
Years ago, when Dankoff Solar Products was in its prime as a
distributor, Phil U did a load capacity test on various inverters of the
time, including the Magnum MS4024. It had remarkably strong surge
capacity, but did this by allowing a much greater voltage drop - down to
around 80 VAC, if I recall, on a 120 VAC inverter.
You may be dealing with a structural issue, for which upgrading the pump
may be the best solution.
Allan
*Allan Sindelar*
al...@sindelarsolar.com <mailto:al...@sindelarsolar.com>
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*
**
On 12/10/2016 11:06 AM, Shasta Daiku wrote:
Dan,
Have you measured start up current?
On Dec 10, 2016, at 9:39 AM, Drake
<drake.chamber...@redwoodalliance.org
<mailto:drake.chamber...@redwoodalliance.org>> wrote:
The usual wire I see running to most pumps is #10 UF cable. A 450
foot run might create too much voltage drop. Maybe a buck boost
transformer would help.
Drake
At 12:11 PM 12/10/2016, you 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, Ecotech Institute
IREC Certified Instructorâ„¢ for:Â
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342 <ttel:970.672.4342>
Â
On Sat, Dec 10, 2016 at 9:53 AM, RE Ellison <reelli...@gmail.com
<mailto:reelli...@gmail.com>> 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 <danbo...@gmail.com
<mailto:danbo...@gmail.com>> 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.Â
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;Â
Dan Fink
Adjunct Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:Â
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