[Elecraft] Wattage Draw - K3S/100 vs KPA500/KAT500 - for UPS

[KQ5S-Tom]

Something is not right.  If your UPS is showing 350 with the K3S at idle and over 900 on transmit that is a difference of close to 600.  The K3S draws 17-22 amps at full key down and 100 watts.  Assume 20 amps at 13.8V.  That is only 276.  You are showing double that.

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KQ5S-Tom




> On Aug 30, 2017, at 6:16 AM, MaverickNH <cbjesseeNH at comcast.net> wrote:
> 
> 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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