system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Panasonic just announced solar panels with 22.5% efficiency, What does this mean exactly and what would the benefits be if it where 50%, 75% or a 100%?
gpt
It means 22% of the solar energy that hits the panel is turned into electricity.  So, if if the percentage were greater, you'd get more electricity.

Please note that watts aren't just a measurement of electricity, but a generic measurement of power.

Let's say 1000 watts of sunlight hits the panel.
If your panel is 22% efficient, that means that you get 0.22 times the power that hits the panel.
So, you get 0.22*1000, or 220 watts.

Now, let's say you've got a 50% efficient panel.
That means your power output is 0.5 times the sunlight 
that hits the panel. So, you get 0.5*1000, or 500 watts.

Most currently available panels are between 10 and 15% efficient, so with Panasonic panels, you'll get quite a bit more power.