Now you need either a variable power supply connected to the battery lines, or some kind of variable load.

现在，你需要一个可变电源连接电池线，或某种可变负载。

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You may also use your panel as variable power supply, by tilting it away from the sun while a fixed load is connected to the battery lines.

您还可以使用可变电源的面板倾斜远离太阳，而固定的负载连接电池线。

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By quickly storing and delivering charge, batteries could accommodate fluctuations in supply and demand, and help to incorporate variable sources of power such as wind and solar.

通过快速的存储和高效率的充电模式，电池可以很快的调节供应和需求之间的平衡，同时又可以吸收其他多变的能源，例如风能和太阳能。

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And these electrodes are then connected to a variable voltage power supply.

这些电极然后,和一个变压电源连接起来了。

麻省理工公开课 - 固态化学导论课程节选

That they are not including the cost of connecting wind power to the grid, the necessary costs of dealing with variable supply, of needed back up and so on.

FORBES: Grantham Inst. Report Shows That We Should Abandon Wind Power Subsidies