Dear Mac, I do not believe you will find an efficient AC option because you only need a low pumping rate, and that is only efficiently served by a positive displacement pump. I would look further into the field of maintenance-free brushless helical rotor submersibles. These include Grundfos SQF, Lorentz distributed by GenPro (now nationwide), and some new offings from SunRotor.
Grundfos has the advantage of accepting AC or DC. Lorentz can do same with a converter option.
When there is excess energy at the main system, that can divert power to the pump, using a relay controlled by battery voltage (set up through any of the various controllers or inverters that now provide those functions). See the previous issue of Home Power that had a fine article on diversion controls.
Compare cost estimates of various options and see what shines.
Windy Dankoff
Founder, retired, Dankoff Solar Products, Inc.
Spin-offs: Positive Energy Solar <> Conergy USA,
Dankoff Solar Pumps (Div. Solar Power & Pump Co.)
Co-author, book in progress:
Solar Water Pumping (Taylor & Francis, Earthscan Expert Series)
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Note: I sent Mac's question to Windy and am posting his reply for him.
Allan Sindelar On 5/5/2015 8:36 AM, Mac Lewis wrote:
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