Question About UPS Back-Ups

Okay, I have always heard (and the UPS companies tell you not to do it) that you should never plug a UPS into another UPS and so on....

Why? What will it really do?? Anything bad??

The reason I am asking is because my father-in-law lives on a farm where they have a pre-planned power outage every three months for 6 hours. He wants to be able to keep a few of his household things running for six hours and can do it with a bunch of the APC UPS 650's.......buying a bunch of them is cheaper than a generator or a large UPS.

So, if he plugs a bunch of UPS's into each other......what might happen??

Thanks!

 

 

 

 

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