Posted by
jh3sif on
Aug 30, 2017; 12:00pm
URL: http://elecraft.85.s1.nabble.com/Wattage-Draw-K3S-100-vs-KPA500-KAT500-for-UPS-tp7633842p7633845.html
100W of output power normally needs 200W of input power. My K3 (not S) with sub-RX and other options draws around 18A from DC13.8V power supply on RTTY. On CW or SSB, the DC current goes rapidly up and down according to the modulation.
I guess your UPS does not assume its output current going up and down rapidly, so its high current alarm is triggered by the rapidly changing output current.
73 de JH3SIF, Keith
> 2017/08/30 20:16、MaverickNH <
[hidden email]> のメール：
>
> As mentioned in another thread, I'm running my shack on a UPS that is rated
> 1500va/900w. With my K3S/100 and other hardware plugged in on the same input
> the UPS often max's out at 900W at < 100W on the K3S. Typically, the
> baseline with K3S on RX is ~350W and it spikes over 900W with TX at 100W and
> the UPS limits output. So it seems 100W isn't 100W.
>
> I'm looking to switch in another UPS rated 2200VA/1320W, or 420W higher, for
> use with the KPA500/KAT500 I just acquired from another forum member. so
> from a 100W station to a 500W station. Might this work or is the increase in
> watt TX not equal to the watt drawn?
>
> BRET/N4SRN
>
>
>
> --
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