I’m looking to find a submersible pump to place in a stream on my property for the purposes of pumping water to a small irrigation cistern about 300 feet away (and 10 feet higher in elevation). Preferably solar powered. Anyone have any recommendations?

Hi Chris,   Sorry, no advice on a DC pump but have you considered a ram pump? Found a video which seems to somewhat match your situation: Ram pump

Or a platypus pomp which has blades spun by the flowing water which pumps water away from the stream. Rams are beautiful works of engineering.