You could solo mine to help with decentralization. The Avalon Nano 3's pack a punch (4Th/s) and use about 125Watts. You could buy a few of these and have them solo mine on your generated power whilst still exporting to the grid. That way you have a possibility of finding a block which is worth a fair bit, whilst also earning from your export. It's a win win IMHO.
Not sure solo mining with this setup would be beneficial... even at 20TH you would have 683 years between blocks, according to solochance.org
A lot of people are buying small miners now just for this. It's of course a lottery. There was a single BitAxe that found a block back in July with only 500Gh/s.