Voltage drop with Bioenno (or any LiFePO4 battery) is much less that AGM chemistry. I normally see a minimum of 12.8 or 12.9 volts, under load, until the "bitter end". Then it's a quick decline.
73, Ken, KJ9B ________________________________ From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on behalf of Bob Stephens AF9W via Elecraft <elecraft@mailman.qth.net> Sent: Tuesday, July 8, 2025 12:13 PM To: elecraft@mailman.qth.net <elecraft@mailman.qth.net> Subject: [Elecraft] KXP-100/KX-3 integration 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. When running it as my base station, I set the power supply to 14.2 volts to maintain the 13.8 with the voltage drop across the power supply cable while transmitting. Message: 6 Date: Tue, 8 Jul 2025 01:59:42 +0000 (UTC) From: mjrosen <mjro...@cox.net<mailto:mjro...@cox.net>> To: <Elecraft@mailman.qth.net<mailto:Elecraft@mailman.qth.net>> Subject: [Elecraft] KXP-100/KX-3 integration Message-ID: <1749158500.1143383.1751939982...@mail.yahoo.com<mailto:1749158500.1143383.1751939982...@mail.yahoo.com>> Content-Type: text/plain; charset=UTF-8 I have the?KX-3. Considering adding the 100W amplifier which will only be used in the field. Not SOTA or hiking, car trips for POTA and, vacation use. I have a 20AH Bioenno battery that more than adequately powers KX-3 at 10-15W for QRP activations. I've considered 2 options: 1. Geta a higher capacity battery and run both radio and amp from one battery (think the 20AH will do?)?via the parallel power pole connection on the amp or 2. Just getting a separate battery for the amp. what are other folks' set ups? I seldom?on the air for more than 4 hours as the family/ spouse?looses patience. Thanks, Marc KM7AZ Sent from Yahoo Mail Bob AF9W ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to ken.k...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
