Why do UPS (back up power supplies) have such poor ratings?

laughing man

Trash Compacter
Oct 28, 2017
39
3
I am wondering if I should even buy one. They all have tons of poor ratings. And they can fry your equipment when they blow. Why is it so difficult to make these things?
 

Josh | NFC

Not From Concentrate
Jun 12, 2015
1,868
4,468
Biloxi, MS
www.nfc-systems.com
I've had an APC1000 for years and years and it serves me well. I've had to replace the batteries once.

Mine had a $10,000 guarantee if any damage to my appliances occurred so that gave me alot of confidence.