Go with LiFePO4 cells. Four cells will keep the voltage between 12 and 14.4 V from 10% to 100% state of charge and most of the time the voltage is between 13 and 13.5 V. I use small ones (3 AH )for backpack portable operation, 20 AH for fixed portable and my RV has 400 Ah to run the rig forever! The KX3 stays at the max 15W almost all of the time. No fuss, just works, and they keep their charge for months. Small ones start at about $50.
Regards, Mark On Mon, Jun 24, 2019 at 12:40 PM Fred Soop <fgs...@gmail.com> wrote: > I have looked at the power issue (even though I'm not yet a KX3 owner) and > with NiMH cells at 1.2 V, the 8 cell internal battery holder would only be > 9.6 V. I'm considering an external battery pack with (2) 6 cell holders for > 12 cells total. That would be 14.4 V total. A single series diode would > bring that down to 13.7 V. The NiMH cells do start at 1.5 V with full > charge for a short time, so some additional series diodes would be needed > with a fresh charge and could be switched out as the cell voltage drops to > 1.2 V. A voltmeter and rotary switch with 5 diodes would do the job. > > 73 > Fred Soop AC9RQ > > ______________________________________________________________ > 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 marklgoldb...@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
