I wonder if 2 acres of
pond is big
enough to not need aerating. I don't know, but it seems to me natural ponds do ok without aeration.
If it fills from rain perhaps making the rainwater drop over an edge would be enough.
What I saw when I looked up the $3500 direct
solar aerators looked liked serious overkill. Those are made to look cool, I doubt anything near that is required.
What are you dredging out, dirt or plants? And if plants,what kind?
I don't know, but I'm watching this to see if you get any good answers. I'm curious too.