A controller is required to start our pump, and to prevent stalling in low sunlight conditions. Our controller is simple and robust. Failures are rare. The controller is easily accessible, above ground. I've never even seen a solar pump.
Installation requires nuts and bolts assembly and simple wiring.
It can be installed using the same technique as a conventional AC pump, or it can be installed by hand with sufficient manpower. We have shipped hundreds of solar submersibles to pump dealers, ranchers and homeowners. The first low power submersible diaphragm pumps were introduced starting in 1987 by Solarjack, followed by Shurflo and others. These inexpensive pumps are seriously limited in lifting range and longevity. Grundfos, McDonald, and Solarjack also produce centrifugal type solar pumps, that resemble conventional AC pumps.