A few thoughts. As I said repeatedly, this is illegal and can be dangerous. It was for informational use only, for those who find themselves in certain situations needing solutions. What I described is “back-feeding” the home, not the grid. It does not constitute “back-feeding the grid” until, if and when, the main breaker is returned to the “on” position while the generator is running and connected. It is perfectly safe (even though illegal) for all involved unless, as I also stated repeatedly, someone does something stupid like failing to throw the breaker before hooking up.
The researchers also applied data from this experiment to a simulation where their panels covered the roof of a two-story commercial office building in Las Vegas -- a hot, dry location where their panels would work best -- and contributed to its cooling system. They calculated how much electricity they could save if, in place of a conventional air-cooled chiller, they used vapor-compression system with a condenser cooled by their panels. They found that, in the summer months, the panel-cooled system would save megawatt-hours of electricity, a 21 percent reduction in the electricity used to cool the building. Over the entire period, the daily electricity savings fluctuated from 18 percent to 50 percent.