Typically, silicon solar cells are between 16 and 18 percent efficient.

一般而言，硅太阳能电池的效能在16%至18%之间。

The maximum theoretical efficiency of a silicon solar cell—the amount of energy in sunlight that is turned into electricity—is around 29%.

硅太阳能电池的最大理论效率（即太阳光中转化为电能的能量）约为 29%。

But, Warren notes, it would be better to compare them to solar cells meant to work in low light, such as the silicon solar cells in classroom calculators.

但是，Warren 指出， 最好将它们与在弱光下工作的太阳能电池进行比较，例如教室计算器中的硅太阳能电池。