Re: [Elecraft] UPS Can Be a Noise Source

No, that's just about ideal for battery life. 73, Jim On 9/1/2017 10:32 AM, Phil Kane wrote: Second, a local computer guru, AE6KS, has observed that most UPS mfrs charge batteries at too fast a rate for good battery life. Both spec sheets show a recharge time of 16 hours. Is that "too

Re: [Elecraft] UPS Can Be a Noise Source

Keep in mind that by code, a device plugged into a 15 amp circuit must not draw more than 12 amps continuous. When you get into the larger UPSes, they might want to charge really fast, but charging at a high rate and carrying the rated load will exceed 12 amps. So depending on the rating of

Re: [Elecraft] UPS Can Be a Noise Source

On 8/31/2017 2:56 PM, Jim Brown wrote: > All of the APC units for which I've seen spec sheets are FCC Part 15> Class A > (the industrial spec, ILLEGAL to sell for residential use,> roughly 20 dB worse than Class B). The spec sheets for both of my APC UPS devices (BE550R and BX1500G) specify FCC

Re: [Elecraft] UPS Can Be a Noise Source

On 31/08/17 22:56, Jim Brown wrote: > On 8/31/2017 11:35 AM, Tox wrote: >> I had a couple racks of APC >> SmartUPS 2000 units with daisychained batteries to give extended >> holdup to >> a couple of racks of telecom and server hw. No clue how RF noisy those >> units are, though. > > All of the

Re: [Elecraft] UPS Can Be a Noise Source

On 8/31/2017 3:26 PM, Jim McDonald wrote: I have an APC SmartUPS 700, which I bought many years ago from http://www.refurbups.com/. The manual says it's certified as Class B. Thanks Jim. I looked at a half-dozen APC UPS units advertised on that site about 2 weeks ago, and studied their specs

Re: [Elecraft] UPS Can Be a Noise Source

On 8/31/2017 10:46 AM, Lynn W. Taylor, WB6UUT wrote: > What I did as part of my ISP was to remove the batteries from my UPSes > and replace 7 or 12Ah batteries with 100Ah batteries outside the case. > > That didn't get me to the 10 hours for maximum battery life, but it got > me to 8 hours.

Re: [Elecraft] UPS Can Be a Noise Source

It's not a bad design goal if you can plan on only 1 or 2 outages per year, if that. Probably not too bad if the generator kicks in and you only abuse the batteries for a few minutes. My observation was that the big APC units charged at about half the discharge rate, so yeah, charging too

Re: [Elecraft] UPS Can Be a Noise Source

And my old, but still functioning with a new battery, APC Back-UPS Office, 500VA/325W UPS is also certified Class B. It has a "stepped approximation to a sine wave." 73, Jim N7US -Original Message- I forgot to add that the manual says it produces a sine wave. 73, Jim N7US

[Elecraft] UPS Can Be a Noise Source

I have a couple CyberPower uninterruptable power supplies in my shack and I have noticed no issues RX or TX. John KK9A Randy Farmer w8fn wrote: Thu Aug 31 20:09:52 EDT 2017 Hmmm. I had a Cyber Power 1500VA unit for a while on my station, but one day I transmitted on 12 meters and something

Re: [Elecraft] UPS Can Be a Noise Source

Hmmm. I had a Cyber Power 1500VA unit for a while on my station, but one day I transmitted on 12 meters and something inside the thing made a "pop". This was followed by a loud "crack" and the UPS expired then and there. I should note I have an extremely difficult RF environment on my tiny

Re: [Elecraft] UPS Can Be a Noise Source

I forgot to add that the manual says it produces a sine wave. 73, Jim N7US -Original Message- I have an APC SmartUPS 700, which I bought many years ago from http://www.refurbups.com/. The manual says it's certified as Class B. 73, Jim N7US -Original Message- On 8/31/2017

Re: [Elecraft] UPS Can Be a Noise Source

I have an APC SmartUPS 700, which I bought many years ago from http://www.refurbups.com/. The manual says it's certified as Class B. 73, Jim N7US -Original Message- On 8/31/2017 11:35 AM, Tox wrote: > I had a couple racks of APC > SmartUPS 2000 units with daisychained batteries to

Re: [Elecraft] UPS Can Be a Noise Source

On 8/31/2017 11:35 AM, Tox wrote: I had a couple racks of APC SmartUPS 2000 units with daisychained batteries to give extended holdup to a couple of racks of telecom and server hw. No clue how RF noisy those units are, though. All of the APC units for which I've seen spec sheets are FCC Part

Re: [Elecraft] UPS Can Be a Noise Source

Good observations, Lynn.  A few more. First, I failed to observe that my 100Ah LiFePO4 battery runs ONLY my K3s. A big lead-acid from Costco runs other 12V gear and LED lighting. I do NOT try to provide UPS for power amps.  If I need them, I'll fire up the big 240V generator. Second, a local

Re: [Elecraft] UPS Can Be a Noise Source

That said, for my own use, I've got a 100Ah LFP from Blackwood Innovations for my ham hear; BioEnno has units all the way up to 300Ah for the deep-of-pocker. On Thu, Aug 31, 2017 at 11:35 AM, Tox wrote: > There are also UPSes meant for extended runtimes that are a little

Re: [Elecraft] UPS Can Be a Noise Source

There are also UPSes meant for extended runtimes that are a little less brutal on the batteries. One Upon a Time, I had a couple racks of APC SmartUPS 2000 units with daisychained batteries to give extended holdup to a couple of racks of telecom and server hw. No clue how RF noisy those units are,

Re: [Elecraft] UPS Can Be a Noise Source

I'm going to add that nearly every UPS made is meant to bridge the time between when the power goes out, and the (automatic) generator starts. If you don't have a generator, the UPS signals the computer(s) so that they can shut down gracefully and turn the UPS off. The (typically AGM

[Elecraft] UPS Can Be a Noise Source

A UPS consists of a DC power supply that charges a battery, and a DC-AC inverter to convert the battery voltage to 120VAC.  Both operations can be noisy. The DC power supply is probably a swtich mode, and the inverter is a square wave generator that is shaped to resemble a sine wave. Most UPS