Back to the original question about solar, generally if your application is heating water, you would go a solar-thermal route where the sun is directly heating the water, rather than using a solar panel and then trying to run a heater off the resulting electricity. If you think of how hot the water can get in a hose on a sunny day, that's the effect they mimic.
The solutions are a little different depending upon whether your goal is to prevent water from freezing or whether you are trying to create genuinely hot water. There are DIY plans and ready-made solutions for both around.
That said, as others suggested, I think you'd find that running electricity is going to cost you a similar amount, and electricity has the benefit of being more flexible and useful for more things.
For discussion of tools like shearing gear, trailers, handling facilities all the way down the line to hoof shears. Sources, experiences, etc.
- Chief Shepherd
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The other thing that I have seen is a solar panel running a bubbler. The movement of the water keeps ice from forming directly above the air outlet, and it takes significantly less power than heating a tub of water.
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