Emergency standby power refers to a backup power source that is used only in case of a power outage or failure, in order to provide essential services such as lighting, heating, cooling, and communication. It is typically used in critical facilities such as hospitals, airports, and data centers.

Optional standby power, on the other hand, refers to a backup power source that provides non-essential services such as recreational activities, appliances, and electronic devices. This type of backup power is usually used in homes, recreational vehicles, and other similar settings.

In summary, emergency standby power is necessary for essential services, while optional standby power is for non-essential services.

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