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: [email protected] <[email protected]> on behalf of Bob Stephens AF9W via Elecraft <[email protected]> Sent: Tuesday, July 8, 2025 12:13 PM To: [email protected] <[email protected]> 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 <[email protected]<mailto:[email protected]>> To: <[email protected]<mailto:[email protected]>> Subject: [Elecraft] KXP-100/KX-3 integration Message-ID: <[email protected]<mailto:[email protected]>> 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
