I'd generally run 75W, My activations 2-3 hours (I get tired) 20AH should make 
it from all the responses I've seen..Thanks, Marc KM7AZ


Sent from Yahoo Mail


On Tuesday, July 8, 2025, 9:35 AM, Mike Dodd via Elecraft 
<[email protected]> wrote:

On 7/8/2025 12:13 PM, Bob Stephens AF9W via Elecraft wrote:
> A consideration with the KXPA100 is that it requires a minimum of 13.8 volts 
> to get 100w out.  As the voltage drops below that amount, the output drops 
> also.  I owned one for 10 years and it didn't like operating from AGM 
> batteries.  At 12.6 volts I got around 80w.

Keep in mind that 20-watt difference is less than 1db -- one-sixth of an 
S-unit.

--- Mike N4CF

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