Worked well for the first few hours but blew out after the fourth hour. The engine just hums. Wires are thin 20 gauge, should be 1 size larger. It drew 0.75A from my 12.5 volt battery, 0.9A from the 16.5 volt solar panel. I measured about 1 gpm at a head height of about 5 feet. A little less with a battery, a little more with a solar panel. There were no instructions so I was never told what not to do. I tested partial panel shading and had no problems. Maybe he won't survive the sunset. But I thought that was the point. This is a solar water heating pump, so pump when it's sunny, stop without sun. I've emailed the seller, let's see if he responds. Only worked 4 hours :-( I was only checking for that reason because if the pump ever fails your solar water heater will trip the P/T safety valve and water will flow all day. If the P/T safety valve fails, The Hose near the solar water heater may burst.
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