Recently, a paper was published explaining a hybrid inorganic–biological artificial photosynthesis system for energy-efficient food production. In short, a new artificial photosynthetic-inspired system that produces acetate that can be directly incorporated into plant, yeast, fungi or algae biomass was developed and was shown to be four times more effective than photosynthesis.
If such a system could be engineered into cyanobacteria/microalgae along with standard photosynthetic system to allow biomass production even during the night (by addition of acetate during night), that could result in much more effective food production from this home device. Maybe a combination of standard and engineered algae could be used to produce biomass. Even a fully engineered species could be used if small solar panel would be attached to the system and constantly "feed" algae with acetate!