I’m hoping someone can help me.
I have several UPSs. Amongthem is a cheap Newpoint UPS. It’s something like 275W/550VA. I was recently experimenting with it, and found some very interesting behavior.
I have a 120V lamp with a LED bulb in it. It takes about 8W, 15VA.
if I fully charge this UPS, hook the lamp up, turn it on, and yank the plug, the light remains on for about 3 minutes.
here’s the kicker – if I fully charge the UPS, hook the lamp up with a “Kill-A-Watt” power meter between lamp and UPS, then pull the plug, it runs for 24 minutes.
the meter itself is simply measuring usage, yes? surely it doesn’t increase runtime 7x.
yet, this behavior is reproducible – at least with this lamp and UPS.
can anyone explain why?