予よ備び電でん源げん

noun

backup power supply; standby power source

Refers to a secondary power source used when the main power fails, such as a backup generator or battery system. Common in technical and disaster-preparedness contexts.

• 停てい電でんに備そなえて予よ備び電でん源げんを設せっ置ちした。

  We installed a backup power supply in case of a blackout.

• このサーバーは予よ備び電でん源げんで動うごいている。

  This server is running on backup power.