Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage. There are some interesting schematics online as well as some quite
cheap 'manufactured' options. But I'm wondering, maybe someone has
some experience / feedback to share?
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power
outage. There are some interesting schematics online as well as some
quite cheap 'manufactured' options. But I'm wondering, maybe someone
has some experience / feedback to share?
On 13/03/2024 13:18, Andriy D wrote:...
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage.
Any offers out there? Even something with a stack of AA
non-rechargeables would be fine.
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage. There are some interesting schematics online as well as some quite
cheap 'manufactured' options. But I'm wondering, maybe someone has
some experience / feedback to share?
Cheers,
\aID
--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3
systems I use APC smart UPS's connect to a large adaptor block that hold around
9 sockets with the APC unit being 1000Va. I did have a 2k2 VA but the
There are tons of different '5v usb ups' options on Aliexpress π
But if you've ever dealt with them, you know the quality ...
On 13/03/2024 13:18, Andriy D wrote:
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
No answers - but it's something I've been wondering about off and on
(albeit for a Pi4). All the commercial stuff I've seen much exceeds the
base Pi in either pounds [Sterling] or W (or both).
Any offers out there? Even something with a stack of AA
non-rechargeables would be fine.
You mean full blown AC UPS, like APC used to do? Or do you know some well-known brands producing USB UPS?I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage. There are some interesting schematics online as well as some quite
cheap 'manufactured' options. But I'm wondering, maybe someone has
some experience / feedback to share?
Any inexpensive backup power unit from a recognized brand will do. There is no
need to overthinkig it if you don't want to. The cool thing of an Uninterrupted
Building one yourself? I have never done it but it looks quite doable. Keep inThis is exactly my concern - I want this think up&running 24/7/365 and I don't want
mind that starting an electrical fire or spilling the contents of your homemade
battery on your carpet sucks. I'd use a self-made unit for the fun of it in a safe environment but I would not leave it running 24/7 so happily.
This is exactly my concern - I want this think up&running 24/7/365 and I don't want
it to burn my house down π
I guess this is where you'd say 'risk' and 'price' are in a inverse relationship π
--It is entirely possible to trickle charge a lithium cell at uber low
On 14/03/2024 07:57, Andriy D wrote:Majority of the schemes I've found so far suggest use of NiMH cells as
This is exactly my concern - I want this think up&running 24/7/365 and I don't wantIt is entirely possible to trickle charge a lithium cell at uber low
it to burn my house down :)
I guess this is where you'd say 'risk' and 'price' are in a inverse relationship ;)
--
risk, Essentially you want to current limit the supply at at one tenth
of the hourly capacity so e,g a 2200mAh celll would need to be charged
at no more than 220mA, and voltage limit the charge at 4.2V.
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage. >There are some interesting schematics online as well as some quite
cheap 'manufactured' options. But I'm wondering, maybe someone has
some experience / feedback to share?
Cheers,
\aID
I'm using a cheap APC, I believe 650 or 750, with USB monitoring hookup. Also have my router connected (with VOIP) to keep
communication possible for a little while (runtime abt 30 minutes). Battery replaced once, I believe it was some 7 years old.
On Wed, 13 Mar 2024 13:18:45 -0000 (UTC), usenet@dolik.dev (Andriy D) wrote:
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage.
There are some interesting schematics online as well as some quite
cheap 'manufactured' options. But I'm wondering, maybe someone has
some experience / feedback to share?
Cheers,
\aID
On 14/03/2024 15:51, Joe wrote:
I'm using a cheap APC, I believe 650 or 750, with USB monitoring hookup. Also have my router connected (with VOIP) to keep
communication possible for a little while (runtime abt 30 minutes). Battery replaced once, I believe it was some 7 years old.
Somehow that makes no sense to me..... current 650 is 227 pounds (maybe plus VAT) on the APC website. 5 times the cost of the Pi. I'm sure it's a
very nice UPS, but.... ???
On Wed, 13 Mar 2024 13:18:45 -0000 (UTC), usenet@dolik.dev (Andriy D) wrote: >>
Hi,
I'm considering adding some backup power supply for my RPi2 mainly
to avoid filesystem issues which may be caused by a short power outage. >>> There are some interesting schematics online as well as some quite
cheap 'manufactured' options. But I'm wondering, maybe someone has
some experience / feedback to share?
Cheers,
\aID
On 13/03/2024 03:32, Vincent Coen wrote:
systems I use APC smart UPS's connect to a large adaptor block that
hold around 9 sockets with the APC unit being 1000Va. I did have a
2k2 VA but the
And what's the standby current of such a UPS?
The Natural Philosopher <tnp@invalid.invalid> wrote:
On 14/03/2024 07:57, Andriy D wrote:Majority of the schemes I've found so far suggest use of NiMH cells as
This is exactly my concern - I want this think up&running 24/7/365 and I don't wantIt is entirely possible to trickle charge a lithium cell at uber low
it to burn my house down :)
I guess this is where you'd say 'risk' and 'price' are in a inverse relationship ;)
--
risk, Essentially you want to current limit the supply at at one tenth
of the hourly capacity so e,g a 2200mAh celll would need to be charged
at no more than 220mA, and voltage limit the charge at 4.2V.
they are less 'combustive'.
However cheap AliExpress devices do use Li-ion cells. Confusing :)
The Natural Philosopher <tnp@invalid.invalid> wrote:
On 14/03/2024 07:57, Andriy D wrote:
This is exactly my concern - I want this think up&running 24/7/365 and I don't wantIt is entirely possible to trickle charge a lithium cell at uber low
it to burn my house down :)
I guess this is where you'd say 'risk' and 'price' are in a inverse relationship ;)
--
risk, Essentially you want to current limit the supply at at one tenth
of the hourly capacity so e,g a 2200mAh celll would need to be charged
at no more than 220mA, and voltage limit the charge at 4.2V.
Majority of the schemes I've found so far suggest use of NiMH cells as
they are less 'combustive'. However cheap AliExpress devices do use Li-ion >cells. Confusing :)
Andriy D <usenet@dolik.dev> wrote:I had this thought as well, as all I need is to have enough power to
The Natural Philosopher <tnp@invalid.invalid> wrote:
On 14/03/2024 07:57, Andriy D wrote:Majority of the schemes I've found so far suggest use of NiMH cells as
This is exactly my concern - I want this think up&running 24/7/365 and I don't wantIt is entirely possible to trickle charge a lithium cell at uber low
it to burn my house down :)
I guess this is where you'd say 'risk' and 'price' are in a inverse relationship ;)
--
risk, Essentially you want to current limit the supply at at one tenth
of the hourly capacity so e,g a 2200mAh celll would need to be charged
at no more than 220mA, and voltage limit the charge at 4.2V.
they are less 'combustive'.
Indeed, but if the power requirements are low (a Pi Zero without any power-hungry USB/HDMI connections) then supercaps might be an easier
option. Since then you don't need to worry about over-charging,
which will still wear out NiMH, even if it doesn't then burn your
house down.
Mike Scott wrote:
And what's the standby current of such a UPS?
Standby ?
Assuming it is fully charged which would be normal (assuming no outage in the preceding 2 - 3 hours 95% or better.
Otherwise do you mean the estimated run time if so then system under power in watts per
hour under the rated size - 25% so lets say :
750 w
---- = 150 = long time :)
5 w
Assuming it is fully charged which would be normal (assuming no outage in
the preceding 2 - 3 hours 95% or better.
Otherwise do you mean the estimated run time if so then system under
power in watts per
hour
under the rated size - 25% so lets say :
750 w
---- = 150 = long time :)
5 w
Also e.g., my desktop / server system with an estimated consumption of
250w (and it is lower as using modular PSU, 85% eff or better ) would be around 3 hours but that assumes there is nothing else under load and
On 14/03/2024 15:51, Joe wrote:
I'm using a cheap APC, I believe 650 or 750, with USB monitoring hookup. Also have my router connected (with VOIP) to keep
communication possible for a little while (runtime abt 30 minutes). Battery replaced once, I believe it was some 7 years old.
Somehow that makes no sense to me..... current 650 is £227 (maybe plus
VAT) on the APC website. 5 times the cost of the Pi. I'm sure it's a
very nice UPS, but.... ???
...I'm using a cheap APC, I believe 650 or 750, with USB monitoring
hookup. Also have my router connected (with VOIP) to keep
communication possible for a little while (runtime abt 30 minutes).
Battery replaced once, I believe it was some 7 years old.
Somehow that makes no sense to me..... current 650 is 227 (maybe plus
VAT) on the APC website. 5 times the cost of the Pi. I'm sure it's a
very nice UPS, but.... ???
This one https://www.amazon.co.uk/Eaton-850B-UPS-Uninterruptible-Type -Black-white/dp/B0B3RQN8QTSpeaking of Eaton, I've found they have Eaton 3S Mini UPS which seems to
@ (today) 126 UKP is similar to the
APC, includes shutdown & monitoring via USB + software. I trust Eaton
as much (or more) as APC.
Make that 5 minutes * 500W/5W or 500 minutes which is indeed a long time but a lot shorter than the 150 hours you were expecting.
On Thu, 14 Mar 2024 21:00:49 +1300 nospam.Vincent.Coen@f1.n250.z2.fidonet.org (Vincent Coen) wrote:
Assuming it is fully charged which would be normal (assuming no
outage in the preceding 2 - 3 hours 95% or better.
Otherwise do you mean the estimated run time if so then system under
power in watts per
hour
You have units confusion. Watt is a unit of power, a rate of
movement of energy. Watt-Hours and similar units are units of energy.
Watts per hour is meaningless.
under the rated size - 25% so lets say :
Assuming you are talking about an APC SMT750I or similar they are
rated for a power output of 750VA or 500W. At full power the battery
is good for about five minutes.
750 w
---- = 150 = long time :)
5 w
Make that 5 minutes * 500W/5W or 500 minutes which is indeed a
long time but a lot shorter than the 150 hours you were expecting.
Also e.g., my desktop / server system with an estimated consumption
of 250w (and it is lower as using modular PSU, 85% eff or better )
would be around 3 hours but that assumes there is nothing else under
load and
No it would be maybe 15 minutes.
On 15/03/2024 10:51, Ahem A Rivet's Shot wrote:
Make that 5 minutes * 500W/5W or 500 minutes which is indeed a
long time but a lot shorter than the 150 hours you were expecting.
If you want 150 hours, you need to be looking at a backup generator, so
your UPS only needs to last as long as it takes for your generator to
fire up.
Watts
per hour is meaningless.
On 15/03/2024 10:51, Ahem A Rivet's Shot wrote:
Watts
per hour is meaningless.
Not as a ramp rate for a power station :-)
Mike Scott <usenet.16@scottsonline.org.uk.invalid> wrote:
On 14/03/2024 15:51, Joe wrote:
I'm using a cheap APC, I believe 650 or 750, with USB monitoring hookup. Also have my router connected (with VOIP) to keep
communication possible for a little while (runtime abt 30 minutes). Battery replaced once, I believe it was some 7 years old.
Somehow that makes no sense to me..... current 650 is 227 pounds (maybe plus >> VAT) on the APC website. 5 times the cost of the Pi. I'm sure it's a
very nice UPS, but.... ???
Sense or not, it seems to be a fact of life. The inverter/charger/transfer units
I used have vanished from Amazon, replace by units with four times the power and
double the price. Battery prices seem to have dropped very slightly, but are still a whisker over $200/kWH.
A 12 volt to 5 volt stepdown converter appears to be less than $10, small 12 volt
batteries range from $20-100 in the few AH range, a 12 volt 5 amp charger ranges
from $11 to $50. The charger would be the iffy part, since a smart charger on a
loaded battery is apt to get confused by what looks like high self-discharge..
Something reliable for less than $100 will take both luck and ingenuity. One possibility is finding a used UPS unit in e-waste and replacing the battery.
bob prohaska
side, you could put it all downstream of the Pi power supply
and skip line detection entirely. That's a big advantage.
Seems the rechargeable bit is the issue. For my part, and purely to use
as a short-term standby for the Pi until mains resumes or the system can
shut down cleanly - I'd be happy with something with a bundle of AA
cells or similar. I doubt a clean switchover circuit would be difficult
to design, but my electronics knowledge is decades out of date :-{
bp@www.zefox.net wrote:
side, you could put it all downstream of the Pi power supply and skip
line detection entirely. That's a big advantage.
On second thought, this is probably wrong. If one connects to a Pi a 5 volt supply in parallel with a blocking diode and a 6 volt battery, the diode is still forward biased and will drain the battery eventually. Some kind of switch is needed, controlled by line detection.
Maybe a three terminal regulator set for 5 volts out powered by a 9 (or higher) volt battery pack could be substituted. Still, one has to consider the idle draw of the regulator. TI's LM340 takes 6 mA roughly. Still,
that's a smallish supply for a Pi. You'll likely want something larger.
bp@www.zefox.net wrote:
side, you could put it all downstream of the Pi power supplyOn second thought, this is probably wrong. If one connects
and skip line detection entirely. That's a big advantage.
to a Pi a 5 volt supply in parallel with a blocking diode
and a 6 volt battery, the diode is still forward biased
and will drain the battery eventually. Some kind of switch
is needed, controlled by line detection.
Maybe a three terminal regulator set for 5 volts out powered
by a 9 (or higher) volt battery pack could be substituted.
Still, one has to consider the idle draw of the regulator.
TI's LM340 takes 6 mA roughly. Still, that's a smallish
supply for a Pi. You'll likely want something larger.
Apologies for the red herring!
bob prohaska
You mean full blown AC UPS, like APC used to do? Or do you know some well-kn brands producing USB UPS?
Somehow that makes no sense to me..... current 650 is Β£227 (maybe plus
VAT) on the APC website. 5 times the cost of the Pi. I'm sure it's a
very nice UPS, but.... ???
... For my part, and purely to use
as a short-term standby for the Pi until mains resumes or the system can
shut down cleanly
I think the chances of finding an 'ideal' battery are relatively slender.
You are likely forced into some sort of 5v switched mode regulator - and
its probably wisests at least for a single Pi - to have that permanently delivering power and just have the battery on permanent mild charge
For one Pi a 5 volt regulator connected to a battery
that's held on a float charger is probably the cheapest,
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