[Elecraft] Breakers for KPA1500?

[Bob McGraw K4TAX]

Per the manual 50% efficiency.  So at 1500 watts output the. input would be abt 3Kw. A 20 amp ckt at 240 V would supply 4.8 Kw. Seems reasonable to have adequate power for other equipment. 

Bob, K4TAX


Sent from my iPhone

> On Jul 10, 2018, at 12:34 PM, "john at kk9a.com" <john at kk9a.com> wrote:
> 
> I based that statement on the 20amp KPA1500 rating shown on page 28 of
> their manual. Obviously this is incorrect or it is very inefficient, but
> still a station can have multiple heavy duty rotators, computers, multiple
> transceivers, etc.
> 
> http://www.elecraft.com/manual/E740301%20KPA1500%20Owners%20Manual%20Rev%20A8.pdf
> 
> John KK9A
> 
> 
> Jim Brown jim at audiosystemsgroup.com
> 
>> On 7/10/2018 9:13 AM, john at kk9a.com wrote:
>> Yes you can run three conductor
>> Romex and have a 120v and 240v outlet but I do not see this as a good plan
>> as it could easily exceed 20 amps on one leg. Upgrading to higher amperage
>> circuit and you'll exceed the amperage rating for a standard 120v outlet.
>> Two separate circuits are much easier to manage.
> 
> It's hard to imagine how 20A on a 240V circuit split to 120V outlets
> (with neutral) could be exceeded in a single operator ham station
> running legal power, and powering only ham gear from that circuit. Let's
> say that the power amp is drawing 15A keydown. That's 3.6kW, and you
> still have 5A at 120V on each of the two legs. Now, let's say that you
> have an Astron 14.4V supply running on one of those outlets powering a
> tranceiver, even two or three tranceivers, only one of them TX at a
> time. I find it hard to believe that the Astron draws more than 3A,
> probably less. Add an old big iron computer to the other leg, maybe 1A
> on that leg. Indeed, a second power amp could be running off that
> circuit as long as only one is in TX mode at a time!
> 
> 73, Jim K9YC
> 
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