Some cutting-edge photovoltaic cells offer an even higher initial efficiency but fall behind when the DC power they produce is converted to grid-ready alternating current.

一些先进的光伏电池甚至可以提供更高的效率，但是由于要把直流电源转化为交流电，转换效率有所降低。

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The disadvantage is that reverse electrodialysis produces direct current, whereas the world runs mostly on alternating current.

不足处是反向电渗析产生的是直流电，而世界上主要使用交流电。

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Mains electricity in America is supplied as alternating current at 60 Hertz.

在美国，主要供应频率为60赫兹的交流电。

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Traditional inverters gather power from all or most of the panels in an installation and use transformers, capacitors and switches to change it from direct current to alternating current.

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That inverter changes the current to alternating current.

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An inverter converts the direct current from the battery into the alternating current for feeding the grid.

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