"Brian" wrote:

use solar power? Is it prohibitively expensive, or simply inadequate for
the power demands of most pond systems? I would love to hear if anyone is
using solar power and how they have things set up.

My pond, being under the canopy of a maple tree, doesn't get enough
light but to charge one solar led at one corner.

Good idea, it would be expensive. You'd need a battery setup to keep it
going at night, cloudy days, weeks, etc.

You can spend, er build, a big enough solar setup to do pretty much
anything you want.