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The solar-panel installer is replacing diesel engines in villages in India and other Asian countries.
Cheap panels from China have forced the U.S. solar giant to lay off workers and close factories, but the company says it sees a way out of its mess.
The secret is using existing technology.
No other means of storing energy may be able to reach the scale required to run Germany on solar and wind power.
A new design shrinks the device connecting solar panels to the grid, cutting installation costs.
In the short term, tariffs will help U.S. solar panel makers. But they could have unintended consequences.