The reason I would want to run them in series rather than parallel is to obviate the need to manually switch over the valves.
If they are in series, that would allow me, for example, to run the electrical pump every night for a couple of hours on a timer AUTOMATICALLY to supplement the solar pump should it prove necessary.
The solar pump would not be working at night, and the timed electrical pump would not work during the day, so they would never both be working at the same time.
Of course, for this to work, both pumps would have to allow water to pass through when they are not working without creating significant resistance and without damaging themselves over time. Both these are iffy propositions, and I have recently been advised against the series installation due to just this long-term damage potential.
Sometimes I really wonder why it is that the world doesn't work the way my own logic tells me it should.
Ideally, I should be able to hook up two pumps in series, work one from solar, and spill the leftover energy (if any) into my home grid. This while maintaining the regular pump as an in-series redundant back-up. All the while setting it up cheaply enough so as to amortize within three to four years. That;s what my brain tells me. Now, to squeeze reality into that box...
As an aside, I would really like to know why there are no import exemptions or incentives on solar and wind technology in a country that cannot produce enough power for it;s population. ARRRRRRGH!!!!
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