Hi Coastal: Thanks for that. We got a few bloodgrass plants recently as well. Lovely colour right now. Pretty healthy pumps! Our solar system provides 24 volts nominal, which is inverted up to 120 volts. Just one of your pumps would show up as a 20 amp draw on our system. That would be certain battery death in nothing flat. I might try a single dedicated solar panel to run a 12 volt bilge pump. Of course, it would only run when the sun was out, but better than nothing. What do you have in the way of fish in your pond? Due to our resident herons, I think fish are out of the question here.