[Elecraft] Off the Grid
Lynn W. Taylor, WB6UUT
KX3 at ColdRocksHotBrooms.com
Tue Mar 4 19:32:43 EST 2014
If I'm reading this correctly, on receive, you're drawing 240 to 280 watts.
At 12 watts, you're drawing 360 to 420 watts.
For 50 watts out, you need more than 800 watts in.
Someone else suggested that a 60 amp-hour car battery would probably run
the rig for a day. If I'm reading this correctly, you'd do no more than
3 hours if you did not transmit.
For lead-acid batteries, you don't want to exceed the 10 hour rate, so
the smallest acceptable battery would be over 200 amp-hours, and only
for just-receive.
Something seems a little off.
-- Lynn
On 3/4/2014 2:41 PM, Paul Grigorieff wrote:
> My K3, on receive, with the KAT500 in-line, the P3, and my massive 70A
> Astron p.s. powering the K3, drew about 20A DC. Putting the K3 in
> transmit mode, with just under 12W drive (so as not to kick in the
> 100w amp) required about 30A DC. Boosting the output to 50W drew
> about 70A DC. Running it "wide open," at 100W out, required about 80A
> DC. And finally, turning on the KPA-500, with 15W drive to yield 300W
> out, required 150A DC.
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