Current draw of Smart UPS 1400 from wall

[Anonymous user]

I'm looking into getting a used Smart UPS 1400, and I'm somewhat current-limited in my new place, so I need to get a rough idea of how many amps this UPS pulls.

My equipment draws around 3A. When the battery is fully charged, how many amps will the UPS draw? What about after a 10-20 minute spell without power, and it has to recharge the battery?

[Anonymous user]

My Smart-UPS 1500 is measuring about .89amp/30watt while charging the battery or about 11watts not charging.

I've contacted support for my Kill-A-Watt meter because at 119.1v, something isn't adding up right. .89amps would be about 106 watts, not 30.

But at least that gives you a ballpark number

Take care,
Stew

[Anonymous user · Accepted solution]

Is it on "max" when you got the current? My energy meter cycles through volts, amps, max amps, watts, and max watts.

Could you run something off the wall and then through the UPS (powered from wall) to see what the difference in amperage is? I'm hoping it doesn't jump up too drastically.

[Anonymous user · Accepted solution]

Well, I'm not sure what exactly is going on. I checked the Kill-A-Watt meter against two lamps with a known wattage and got the results I was expecting.
-------------------------------------------------------------------------------
Lamp 1) 60 watt
Kill-A-Watt readings: Volt: 118.9, Amp: .47, Watt: 57

Lamp 2) 150 watt
Kill-A-Watt readings: Volt: 118.7, Amp: 1.22, Watt: 145
-------------------------------------------------------------------------------

Both of these add up correctly, now plug the Smart-UPS back in...

Test 1) Sitting idle, not charging, no load
Kill-A-Watt readings: Volt: 119.4, Amp: .82, Watt: 20

Test 2) Not charging, 150 watt lamp load
Kill-A-Watt readings: Volt: 118.6, Amp: 1.63, Watt: 165

Test 3) Charging and 150 watt lamp load
Kill-A-Watt readings: Volt: 118.7, Amp: 2.48, Watt: 270

Test 4) Charging, no load
Kill-A-Watt readings: Volt: 118.9, Amp: 1.13, Watt: 82

In none of the cases does the Kill-A-Watt 'Volts x Amps = Watts' formula add up with the Smart-UPS 1500 as it should. This is perplexing indeed, if anyone knows what the heck is going on, please let me know.

Stew.

Lowboy: The readings are real time, there isn't a max screen. Good thought though, the mystery deepens...

Message was edited by: Stew-2

[Anonymous user]

Odd indeed! Anyway, it gives me an idea of what to expect, thanks for doing that!