| 摘要 |
A fuel cell system provided with a secondary battery supplying electric power to an outer load and a fuel cell supplying power at least to the secondary battery is controlled such that, by calculating charge allowance amount level in the secondary battery and calculating an excess amount of electric power that can be generated by an excess amount of fuel gas produced in the fuel cell system when operation of the fuel cell is stopped, the charge allowance amount level in the secondary battery is equal to or higher than the excess amount of electric power.
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