Dick: A few more notes. Outgassing is not a normal occurrence of lead acid batteries. It occurs when there is substantial overcharge. That is why you always use a regulator so outgassing doesn't occur. Second SLA stands for sealed lead acid. These batteries are partially sealed to prevent outgassing. They do have blowout plugs to prevent explosions. Finally there are battery monitors available at reasonable cost. They will sound an alarm if your battery voltage is too high or too low thereby giving warning that something is not right. I also attach a 12vdc LED light strip to my power alarm. That way when the house lights go out I can still see the controls to shut things down if need be.
73, Fred, AE6QL -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Don Wilhelm Sent: Monday, December 22, 2014 12:06 PM To: Richard Fjeld; elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 13.8 VDC power Dick, Yes, hydrogen outgassing is a potential problem, and the area containing a normal lead-acid battery should not only be protected from sparks and ignition sources, but should also be vented to the outside. I would suggest that you look at a larger gel cell or an AGM battery. If you use a normal lead acid deep cycle battery, you could enclose it in a tight battery box (often used in RVs) which has a vent hose that you could route outside. 73, Don W3FPR On 12/22/2014 2:51 PM, Richard Fjeld wrote: > Wow, thanks to all for the greatly informative answers. I gleaned > many good ideas from them. > > This is my concern; I am interested in protecting my K3 from damage by > not being shut down properly should a power interruption occur while > the K3 is operating. For this design, I'm thinking about a worst case > scenario; in transmit mode at 100 watts/20 amps, plus accessories on. > > I am concerned about Hydrogen gas while charging a lead-acid battery > here in the furnace room. Since I don't need to operate by battery > power, I'd like to know your thoughts about if a Gel-Cel battery of a > 9 amp variety would handle the 20 amp load until I could go to receive > mode and properly shut down? > I haven't had any experience drawing that much amperage from a gel-cel > momentarily. I don't know if the load voltage would be adequate to > keep the K3 alive. I'd need to test it using an older style radio. > I'm hoping someone has had experience related to this. > > Thanks in advance for comments, > > Dick, n0ce > > > On 12/22/2014 1:31 AM, Richard Fjeld wrote: >> Is anyone floating a battery across their power distribution? >> >> Dick, n0ce >> >> > > ______________________________________________________________ > 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 > w3...@embarqmail.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 fptowns...@earthlink.net ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5577 / Virus Database: 4257/8787 - Release Date: 12/22/14 ______________________________________________________________ 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
