Allan - my understanding is that with a 2-wire pump, the start capacitor is integrated into the pump housing, underwater. I've never dealt with a 2-wire pump either....my experience has been with start capacitors in 3-wire pumps being located conveniently above ground in the pump control enclosure.
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 3:02 PM, Allan Sindelar <[email protected]> wrote: > 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* > [email protected] > NABCEP Certified PV Installation Professional > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > Founder (Retired), Positive Energy, Inc. > *505 780-2738 <(505)%20780-2738> cell* >
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