There are some solar panels made by Fafco that can be placed on the ground, a fence, etc. I believe there is a 2' x 20' panel that wouldgive you 40 sq. Ft. But you will probably need to run a seperate pump. I think that if you have room for 2 panels, you could size a pump for the flowrate required by the panels and not spend a whole bunch of money. Something likethat would probably extend you season considerably.