Photo of sensors attached to a solar panel.

连接到太阳能面板的传感器。

The battery is charged by a solar panel whenever possible.

太阳电池板可随时为电池充电。

In 2008 and 2009, the average price of a solar panel halved.

在2008年和2009年，太阳能电池板的平均价格减半。

Other solar panel manufacturers are also struggling in the United States.

其他太阳能板制造厂也同样在美国艰难的运营。

Flipping it over though reveals the kicker-a solar panel for charging in the sun.

它的背面是个特色：那是一块太阳能充电板。