For the past 15 years I've been running a small DC surface pump on a 70w panel at about 1gpm when the sun shines. But my spring dry's up early in the year these days so getting a 4 inch well drilled in a month or so. Will likely be <200ft deep. Im going to need a submersible pump and controller. I only need <3gpm from it since it will fill a 2500gal tank that gravity feeds my house. It only need to run when its sunny out. Im not there all the time. I have a spare 325w panel to use, its 47Voc and ~9.3amp Isc. From well ground level to tank level is about 40ft up. Ive been looking at Sun Pumps. Any pump/controller advice? Must have an off contact sensor input, I have a float switch when its full. Kind of on a budget since the well is going to cost a lot!