I haven't read all the replies, don't know if I'm duplicating.
Go here first: http://nemosolar.com/dcsubmersiblepumps/index.html
These pumps are US made, quite simple and I have installed 4 so far and no issues. Get the 24 volt DC model, for fewer amps required, and smaller wire needed. Soldering in sealing the connection wires is critical to protect from water ingress.
Next go here: http://nemosolar.com/dcsubmersiblepumps/id51.html and use the charge controller they spec.
Next go here: http://nemosolar.com/dcsubmersiblepumps/id47.html get the float switch(automatic leveling).
Next go here: https://www.wholesalesolar.com/cms/solarland-slp120-24u-120-watt-module-24v-solar-panel-specs-2236047560.pdf and get the ~120 watt, 24V nominal panel. (or something very similar)
Finally here: https://www.batteriesplus.com/productdetails/sli24mdc or similar. Don't go weird on the batt, just stick with flooded lead-acid, stay low cost.
Get 100' of stranded 12Ga wire. While you are there, get a 100' coil of hard plastic vinyl 1/2" sprinkler tube, couple stainless 2" hose clamps, and a bag of good quality zipties.
Again, careful solder seal connecting the wires to the pump. Warm the sprinkler tubing end and fit it over the pump discharge flange. Secure with the hose clamp. Start running the pump, hose and wires down the bore. Secure the wires to the tubing every 10' or so. You will feel the resistance chance once you get into the water. Go down another few feet and secure the wires and tubing to the well case. I use a split block of wood that pinches the tubing gently. Connect the wires briefly to the batt, with red on + and black on -, and check you draw water up and out of the tube.
Connect the batt to the charge controller first, then the solar panel. Connect the pump + wire to the plus leg of the charge controller load, and run the other wire out to the float switch. Aim the solar panel at the sun, tip the float switch down, and check the pump runs and delivers water.
The last job is to attach the wire of the float switch to a suitable rod stuck in the pond at the approx level you want to maintain. Note that the height delta of the water level can be adjusted by how your attach the leash of the float switch cable to the rod. The longer the leash length, the longer the duty cycle, and the more delta you will have in the level. Use the other hose clamp to secure the float switch leash to the rod. I use a piece of hold hose sleeve around the pump cable to protect it from damage.
Mount your solar panel so it faces the sun, toss the float switch in the water, and the tubing into the pond and viola!
If the batt runs all the way down at first, the charge controller will protect the pump and the batt from damage. Just lift the float switch for a bit, and let the batt recover. Once you have it where you want it, the whole thing will work without intervention. In areas where there is a hard freeze, the batt should be protected from freezing, and the pump should be protected from pumping water into a frozen tube. Either shut it off, or lift the float switch and tie it up so it won't regulate the water level.
I've done a bunch of these, and so far they are all working fine.
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