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UPS Battery Life under Load

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wuchy143

Member
Hi,

I have been trying to figure out exactly how long my 120Vac input, 1440VA(865W), 120Vac output, UPS will last under load during a power outage.

It's APC's J Type Power Conditioner and Battery Backup J25B. Listing is https://www.amazon.com/APC-J25B-8-Outlet-Conditioner-Battery/dp/B003GSLL2E

Amazon give it's prediction but I wanted to calculate it out.

I know that I'm plugging to it a 120Vac load that draws at max 1amp.

so...VA = V X I
= 120V X 1A
= 120



How do I incorporate time? There has got to be another spec. variable I am missing?

Any help would be great.

Thanks
 

MikeMl

Well-Known Member
Most Helpful Member
Last edited:

wuchy143

Member
Thanks. I did have trouble viewing it. Very glitchy page.

Looks like I'm looking at about just under 1 hour for max load. I suppose that's not too bad.

I'm curious if anyone has any insight as to how one would normally calculate this for yourself? Perhaps, there just isn't enough info? If so what am I missing that the manufacturer isn't providing. Granted they provide the graph which is very helpful but I'd just like to know for my own knowledge.

Thanks again for the reply Mike.
 

tcmtech

Banned
Most Helpful Member
Looks like I'm looking at about just under 1 hour for max load. I suppose that's not too bad.
Uhh...

I see about 70 minutes at under 100 watts load and less than 4 minutes at max load on that chart. :facepalm:
 

wuchy143

Member
ah you're right! I read the graph wrong. didn't realize the scaling. so for 120watts it's a runtime of about 50 minutes.
 
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