Re: [time-nuts] UPS for my time rack

Where I live, there are two problems. Frequent long outages. Solved with a natural gas standby generator, which has run several times in anger for extended periods since installed. (Vulnerable supply, low priority for restoration.) The bigger problem is transients. On a good night, my

Re: [time-nuts] UPS for my time rack

On 10/11/2015 12:07 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > Essentially the charging circuits are not designed to run as long as needed > to charge big batteries. Even on ones designed for external batteries, > there's a recommended limit on the size of them. So if you think you might

Re: [time-nuts] UPS for my time rack

Good morning all, On 10/10/2015 5:07 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: I was thinking of doing the same a while back, and intended getting a UPS and adding a large external battery pack, so if the mains failed late at night, I could run the GPS receiver and a few other things

Re: [time-nuts] UPS for my time rack

Hi Unless you live in an unusual location, long term power outages are going to be pretty rare. At the house I’m now in, we had a high voltage feed that was on it’s last legs. We had short outages on a “many times a week” basis if the wind was blowing at all. We had rare outages in the > 5

Re: [time-nuts] UPS for my time rack

Dave, You could use a 120V relay and switch the high capacity battery from its own charger to the battery pack in the UPS. When power comes back, the relay automatically switches the battery out and back to its own charger. Bob >>> -Original Message- >>> From: time-nuts

Re: [time-nuts] UPS for my time rack

Hi If your problem is transients, from lousy power companies or from lighting on your power line, there are ways to address that. High voltage at the service line into the building should be fixed at the point the line comes in. If you don’t, then you get into all sorts of neat “transient went

Re: [time-nuts] UPS for my time rack

Did the transient suppressors, too. A few years ago in a severe winter storm, after we got the neighbor's house on generator, his furnace still wouldn't work -- furnace brain fried. Took the repair guy 4 hours to make 20 minute trip . . . . my surge suppressors went in a week later. One

Re: [time-nuts] UPS for my time rack

I've also seen inverter systems that are designed for stand by power use in service at commercial sites in third world countries. Within reason they basically let you run what ever reasonable arrangement of rechargeable lead acid based batteries you want that will supply the required voltage

Re: [time-nuts] UPS for my time rack

Yes this is a complex topic. At one point in my career when I was responsible for the up time of several data centres for a high tech firm I had an Electrical Engineer on my team to (amongst other roles) work thru the various issues pertaining to UPS systems. I recall there were significant

Re: [time-nuts] UPS for my time rack

I'm fortunate that several of pieces of my time nuts gear (including two of my ocxo's) feature backup 24 volt dc power inputs. They were the only things in my house that stayed running during a recent 2 day power outage while I was away. I have two large 12 volt gel cells in series that I re

[time-nuts] Jackson Labs Fury and GPScon

Hello! This is my first time-nuts email list post so bear with me. I am also a new comer to the frequency-time realm and have much to learn! I have been referencing the list and “mining” info from the members for some time and it has been a great resource with as is the LeapSecond.com

Re: [time-nuts] UPS for my time rack

On Sat, Oct 10, 2015 at 9:20 AM, Chris Waldrup wrote: > Has anyone had bad experience noise wise with the APC brand units like are > available on Amazon and at Staples? I'd like to get one that doesn't > generate lots of RFI. I have an inexpensive CyberPower 825 AVR UPS, The

Re: [time-nuts] UPS for my time rack

Hi In the US, you dig those systems up either via R/V outfits or from the guys who set up big boats (think water borne RVs rather than super tankers). The other source are the off grid solar guys. A lot depends on just how fancy a system you are after. With reasonable effort you can pick up