![]() ![]() so if you're on battery power and drawing a fairly high load you'd likely hear it kick in then as well).Īs I noted, you could test this by running it without a load and seeing if the power draw drops to a lower level after an hour or two. The fan is likely thermally controlled - when the charging circuit heats up, the fan kicks in (it will probably also come in if the source of heat is the inverter. a faster mode for when the batteries are discharged lower than some specific percentage and a slower, less intense mode for when they're getting pretty close to a full charge. I suspect that there are 2-stages of charging. I intend to try one the next time I lose a UPS (or if a replacement works out cheaper than the batteries ). I have read that some of the CyperPower UPS units have a quiescent power draw in the 2 -3 watt range. If I set my meter to VA, then I see about 21 - 22 VA, and the power factor reported is about 0.44.Īs jumperalex pointed out, some units can do a great deal better. Unless the UPS was charging the batteries at the time (and you say that it wasn't) then this looks like the VA reading, and I would guess that the actual wattage was probably about 10 -15 watts for a UPS rated 1500.Ĭhecking my APC BackUPS 1000 RS just now, it reads about 8 - 10 watts when idle with nothing connected and batteries charged. Other users here have had similar issues with strangely high off-state power readings when taking measurements of their servers. Some kill-a-watt style power-meters do not take the effect of the power-factor of the load into account. Was that meter measuring 60 watts or 60 VA? It sounds more like the latter. ![]()
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