Thanks very much for the nice clear explanations for the whole group ... FWIW they are CSB, Long, and BB Battery( all APC standard vendors) - the majority are CSB.
Niel On Jul 30, 2010, at 8:38 AM, Lew Phelps K6LMP wrote: > This appears to be a very "standard form factor" product; you can > find batteries with exactly the same physical and electrical specs > online from a dozen or more different manufacturers. It is a > standard battery for use in UPS systems. > > While I don't know what brand Neil is providing, I found a spec > sheet for one manufacturer's similar product, which I have posted to > my web site in a folder where anyone can download it, at > https://files.me.com/lewphelps/mxvahl > . It's a 483kB PDF file. > > What the power curves show is that it will run for just under 4 > hours at a draw of 1 amp before it drops to 11.0 volts, which means > you could run a K3 in receive only on one battery for that time > (nominal 0.9 amp RX draw with no sub receiver). With a draw of 4 > amps (TX nominal for K-10 is 3 to 4 amps) the battery drops to 12.0 > volts in about 30 minutes (eyeball extrapolation of curves; use with > caution). I think a reasonable way to think about battery life would > be to run them in parallel but assume one battery is providing RX > current and the other TX current; hence, you with a pair of > batteries in parallel you could receive for 4 hours and transmit for > half an hour before you dropped below 11.5 volts. > > Each battery weighs 4.19 lbs. and measures 4.17" height (excluding > connecting tabs) x 3.98 x 3.54 inches. These batteries are too big > to put inside either a K2 or K3. (The "stock" K2 internal battery > has 2.9 ah capacity.) If one were to build an external power supply > box roughly the size of a K3 case, it could contain six batteries > and the charger circuit, and would weigh about 28 lbs. Assuming a > 20% transmit duty cycle, this "six pack" would keep a K3 running for > about 8 hours. YMMV. > > Lew K6LMP > > > > > > ______________________________________________________________ > 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 ______________________________________________________________ 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
