UPS on A10?

[Kal Rubinson]

Why does one care?  If the unit is not active when there is good AC available, it does not affect the sound.  If it makes noise when on battery back-up (which I doubt), who cares as long as it gives you time to shut down?  

[Kal Rubinson]

1 hour ago, FLA10 said:

I would agree but that's what I dont know. When there is a good AC does or can the UPS still add noise to the power?

Simple UPS devices are passive distribution boxes as long as the AC voltage stays in a suitable range.   If the voltage is too high or too low, it should switch to battery.  

 

OK, so it is unlikely to have any effect with proper voltage.  OTOH, it may be even a quieter source when running off battery but even if it is worse, you should just power down the whole system as the battery power provides you the time to do so properly.

 

Full-time, voltage-regulating supplies are another matter since the UPS is always running the system.  There you need a good one. 

[Kal Rubinson]

4 hours ago, Miska said:

Third and most expensive are so called online UPS, which are always regenerating the output voltage from batteries. Different models provide varying amount of output voltage purity depending on intended use cases.

This brings up the issue of how the UPS generates the sine-wave when on battery operation in all three of the types.  Most will output a digitally-synthesized sine wave of very poor resolution.   Only a very few can output a relatively pure sine.

 

However, that issue is of minor importance if the  only use is to let one execute an orderly shut-down.  For an online-UPS, though, it is very important.