How small can you scale it? Net energy metering for small-scale solar is not particularly widespread, and the terms are getting progressively less favorable over time. If you can make an inexpensive unit to turn a few kW of excess production for a few hours a day into fuel at 50% efficiency, you might be able to sell it in some markets. Think of it as a 25% round-trip efficiency battery with immense capacity that can supply winter heat or vehicle power.

edit: for some applications like this, alcohol might be a better end point than gasoline.