Check the devices and add them up.
I have used Smart UPS RM-750`s before and they have an LED indicator on the front to show the "load" being drawn by the plugged in devices - from this you can also gauge how long it will supply power for before shutting down.
However, most UPS take kettle leads as the power inputs, so unless you get a converter or rewire yourself (dangerous) - I¬m not sure if there are UPS for plugs, but as I say I got around it by rewiring the device.
These arent meant for sustainable power when your supply gets cut off - they are meant for allowing sufficient time to shutdown / turn off the devices safely without and damage - thats why they are used on servers a lot.
I have used Smart UPS RM-750`s before and they have an LED indicator on the front to show the "load" being drawn by the plugged in devices - from this you can also gauge how long it will supply power for before shutting down.
However, most UPS take kettle leads as the power inputs, so unless you get a converter or rewire yourself (dangerous) - I¬m not sure if there are UPS for plugs, but as I say I got around it by rewiring the device.
These arent meant for sustainable power when your supply gets cut off - they are meant for allowing sufficient time to shutdown / turn off the devices safely without and damage - thats why they are used on servers a lot.