I used woot often. UPS sale today!
https://computers.woot.com/plus/cyberpower-battery-backup-systems-42
On Sat, Dec 30, 2023, 17:57 Keith Lofstrom wrote:
> Many laptops have some sort of stereo audio input jack.
> I can imagine a resistor+capacitor kludge that
> attenuates the "hot" and
On 12/30/23 22:43, Ted Mittelstaedt wrote:
Interesting I have a smaller 5000k Generac, gasoline powered also. But it's
old-school with the generator output directly feeding single phase 240 power.
It runs at 3600rpm and the armature is a 2 pole so the formula yields 60Hz
Small generator power
ffens
Sent: Saturday, December 30, 2023 5:03 PM
To: plug@lists.pdxlinux.org
Subject: Re: [PLUG] UPS shopping
On 12/30/23 16:00, Ted Mittelstaedt wrote:
> The problem with generators is that the frequency is dependent on how
> fast the rotor spins and the second you put an electrical load on A
Subject: Re: [PLUG] UPS shopping (pure sine ...)
Many laptops have some sort of stereo audio input jack.
I can imagine a resistor+capacitor kludge that attenuates the "hot" and
"neutral" legs of a power cord down to the stereo input levels.
A program on the laptop captures hot
Many laptops have some sort of stereo audio input jack.
I can imagine a resistor+capacitor kludge that
attenuates the "hot" and "neutral" legs of a power
cord down to the stereo input levels.
A program on the laptop captures hot and neutral voltage
waveforms, differences them, and (somehow)
On 12/30/23 16:00, Ted Mittelstaedt wrote:
The problem with generators is that the frequency is dependent on how fast the
rotor spins and the second you put an electrical load on
A generator you increase the magnetic field resistance to the armature and the
generator slows down.
When the
On 12/30/23 15:29, Chuck Hast wrote:
I am not sure you would have to check on each manufacturer, the best ones
are on line double conversion
the power goes through the UPS, it is rectified, the battery floats on it
and the DC feeds an inverter so that
the load never sees mains power. The rest of
then the frequency returns to normal.
Ted
-Original Message-
From: PLUG On Behalf Of Dick Steffens
Sent: Saturday, December 30, 2023 11:39 AM
To: plug@lists.pdxlinux.org
Subject: Re: [PLUG] UPS shopping
On 12/30/23 09:30, Chuck Hast wrote:
> Google 24v inverter there are boat lo
On Behalf Of Chuck Hast
Sent: Saturday, December 30, 2023 3:30 PM
To: Portland Linux/Unix Group
Subject: Re: [PLUG] UPS shopping
I am not sure you would have to check on each manufacturer, the best ones are
on line double conversion the power goes through the UPS, it is rectified, the
battery
I am not sure you would have to check on each manufacturer, the best ones
are on line double conversion
the power goes through the UPS, it is rectified, the battery floats on it
and the DC feeds an inverter so that
the load never sees mains power. The rest of them are some form of
standby/offline
On 12/30/23 09:30, Chuck Hast wrote:
Google 24v inverter there are boat loads of them for 24v PV systems.
Ranging from 300W on up.
https://www.amazon.com/24-volt-pure-sine-wave-inverter/s?k=24+volt+pure+sine+wave+inverter
If you are planning on running computers
and whatnot get a sine wave
0, 2023 12:15 AM
To: Russell Senior
Cc: plug@lists.pdxlinux.org
Subject: Re: [PLUG] UPS shopping - attention suspend?
On Fri, Dec 29, 2023 at 02:36:00AM -0800, Russell Senior wrote:
... UPS ...
> Does anyone have recent experience, either positive or negative,
> and/or any advice on r
Google 24v inverter there are boat loads of them for 24v PV systems.
Ranging from 300W on up.
https://www.amazon.com/24-volt-pure-sine-wave-inverter/s?k=24+volt+pure+sine+wave+inverter
If you are planning on running computers
and whatnot get a sine wave inverter, many switched PSU's do not like
On Saturday, December 30th, 2023 at 12:15 AM, Keith Lofstrom
wrote:
> ...
>
> A nearer term goal is to replace all the hard drives in the
> house with Samsung terabyte SSDs. My test machines suspend
> to SSD in less than two seconds, and reboot in ten.
>
Suspend doesn't save to your SSD.
On Fri, Dec 29, 2023 at 02:36:00AM -0800, Russell Senior wrote:
... UPS ...
> Does anyone have recent experience, either positive or negative, and/or
> any advice on replacements. I'd consider a used older model.
Since computation equals dodopaddle (er "smart phone") for
most of My Fellow
There are plenty of 24 volt input inverters available, typically for
commercial trucks.
NealS
On Fri, Dec 29, 2023, 12:00 Michael Ewan wrote:
> A related question for rolling your own UPS, I have two 12V sealed lead
> acid batteries that I recently replaced ($200) in my mother-in-laws scooter
> which she is no longer able to use. The battery unit for the scooter is
> removable and is
On Fri, Dec 29, 2023, 11:00 AM Michael Ewan wrote:
> A related question for rolling your own UPS, I have two 12V sealed lead
> acid batteries that I recently replaced ($200) in my mother-in-laws scooter
> which she is no longer able to use. The battery unit for the scooter is
> removable and is
A related question for rolling your own UPS, I have two 12V sealed lead
acid batteries that I recently replaced ($200) in my mother-in-laws scooter
which she is no longer able to use. The battery unit for the scooter is
removable and is 24V (the two batteries in series) with a trickle charger,
On Fri, 29 Dec 2023, Russell Senior wrote:
The long-and-short of the matter is that I'm now in the market for a
replacement UPS. The old one was a pretty old APC Smart-UPS 1000,
probably 20-ish years old and had seen numerous battery replacements.
Does anyone have recent experience, either
Out of my price range, but:
https://www.amazon.com/Tripp-Lite-SMART1000RM2UL-UPS/dp/B07VDQ7TZV
On 12/29/23 02:36, Russell Senior wrote:
Hi folks,
This isn't strictly a Linux question, but since it is to power a Linux
machine (or several) I think it is probably close enough.
I have several
Hi folks,
This isn't strictly a Linux question, but since it is to power a Linux
machine (or several) I think it is probably close enough.
I have several Uninterruptible Power Supplies scattered around the
house. A week or so ago, one of them started beeping at me a few times a
day to let me
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