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what is battery capacity (derating) when discharged in 15 minutes?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.


what is battery capacity (derating) when discharged in 15 minutes?

This was originally posted on APC forums on 7/26/2012

Most UPS that I have seen use 12 volt 7.2 Ah SLA batteries. I looked up specs for two brands, and they say the 7.2 Ah is for 20 hour discharge. If you drain it in 1 hour, it is only worth 4 Ah.
That is 56% of nominal capacity.
Now most UPS also state you get 15 minutes at maximum rated power. So if you suck the life out of a battery in only 15 minutes, what do you get? Less than 50% of rated Ah?