Hi Probably an important question to ask - how much current does this sub-species of the Z series pull off of 24V?
My *guess* would be it pulls a couple of watts (say 6W) per box once the OCXO is warmed up. If so, that would be just under 1/4 A on the 28V supply and just over that as the battery crossed 24 V. If you have the full dual box setup, that would be 1/2 A on battery. A 7A SLA would get you 14 hours of run time. At least around here, that’s a long (and unusual) outage. There’s nothing in the house (except the Honda generator) that will run that long in an outage. I’d be quite happy with a 1-2 AH setup that gives me 2 to 4 hours (or half that if my power estimates are bunk). The 7AH’s are already dirt cheap. They make a ton of them. I’d save some money, but not a lot. The main thing I’d save would be space. Bob > On Oct 25, 2014, at 9:54 PM, Tom Miller <[email protected]> wrote: > > I really don't disagree with you. I did say run the supply at 28.0 and use a > diode off the supply to the battery. That would place the float voltage at > 27.3 or so. Best would be to follow the manufacturers float service > recommendations. Ideally it should also be temperature compensated with a > -2.4 mV/°C slope. Not a problem with how we use these in the lab though. > > And yes to get the longest run time, just power the main unit from the > battery as Bob suggested. > > Now I am just waiting on some DB-9 connectors. I ran out of them and the > local RatShak went TU. > > Tom > > ----- Original Message ----- From: "Christopher Brown" <[email protected]> > To: <[email protected]> > Sent: Saturday, October 25, 2014 5:32 PM > Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup > > >> >> Might want to dial that back a bit. >> >> Since 12V/7ah batteries are mentioned I am assuming standard small >> gelcell units. >> >> Proper float voltage for a deep cycle is lower than a SLI type, and >> gellcell even lower. >> >> Generally 13.6 - 13.8 would be the gellcell range, with 13.6 being right >> on for long life use of _small_ batteries. Equalizing charge wold be 14 >> - 14.2. >> >> Floating a small gelcell at 13.6 (27.2) v.s. 14 can mean the diff >> between 12 - 24 months v.s. 5 - 7 years service life. >> >> On 10/25/14, 11:39 AM, Tom Miller wrote: >>> These units are ideal for powering via a float charged lead acid battery. >>> Use two 12 volt / 7 AH batteries in series and adjust the regulated float >>> power supply to 28.0 volts. Be sure to use a diode from the supply to the >>> battery just in case the supply can't be back fed during a power fail. >>> >>> Tom >>> >>> >>> >>> ----- Original Message ----- From: "Bob Camp" <[email protected]> >>> To: "Bob Stewart" <[email protected]> >>> Cc: "Time Nuts" <[email protected]> >>> Sent: Saturday, October 25, 2014 3:01 PM >>> Subject: Re: [time-nuts] Lucent KS-24361/Z3812A GPSDO initial setup >>> >>> >>>> Hi >>>> >>>> Spend the effort, get an antenna outside the house. Beg / borrow / steal a >>>> UPS. Even a brand new one is less than you paid for the 3812. >>>> >>>> >>>> Bob >>>> >>>> >>>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
