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Uninterruptible power supplies
I was watching an item on TV about use of batteries to balance the
national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? |
Uninterruptible power supplies
Scott wrote:
I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption a UPS generally does consume a background amount of power, how else do they cook their batteries with heat? The amount will vary depending whether it's an offline, online, or line interactive type. |
Uninterruptible power supplies
On Sun, 25 Aug 2019 14:57:31 +0100, Andy Burns
wrote: Scott wrote: I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption a UPS generally does consume a background amount of power, how else do they cook their batteries with heat? The amount will vary depending whether it's an offline, online, or line interactive type. Thank you. This is what I suspected. Could you quantify at all? Would a domestic UPS use more power than, say, a TV on stand-by? |
Uninterruptible power supplies
Scott wrote:
I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. Yes, but only journalists who can't do sums, and battery manufacturers, see a major role for batteries in solving this problem. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? It always consumes some, for the electronics and for charging the battery. And the best kind, with an inverter always online, lose power in the inverter. As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Yes. Depending on the filesystem and luck it could damage it even if it is not actively doing anything. -- Roger Hayter |
Uninterruptible power supplies
On Sunday, 25 August 2019 14:50:37 UTC+1, Scott wrote:
I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? The battery charger is not 100% efficient. Once fully charged the battery is often then overcharged continually. Turning 12v or 24v back to 110/230v is also not entirely efficient. As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? For sure, your filesystem can be totally borked - though it usually survives unharmed. NTFS has been much hyped as more robust in this respect, but it's only a limited subset of data that gets duplicated, so it's almost as vulnerable as FAT32. Roger summed it up very well with "Yes, but only journalists who can't do sums, and battery manufacturers, see a major role for batteries in solving this problem." Even if UPSes were 100% efficient, they would still not be practical for grid backup. The costs, pollution, energy consumption in manufacture and vast demand for lead would be problematic. NT |
Uninterruptible power supplies
On Sunday, 25 August 2019 14:50:37 UTC+1, Scott wrote:
I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Batteries have internal resistance. Which varies according to type of battery, age and state of charge. Ergo Ohms law applies. W=I2R Both charging and discharging. |
Uninterruptible power supplies
On Sunday, 25 August 2019 14:50:37 UTC+1, Scott wrote:
I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Don't fret. Buy yourself a laptop. |
Uninterruptible power supplies
On 25/08/2019 14:50, Scott wrote:
I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? https://delta.ecoflow.com/?fbclid=Iw...R3xD5Wny8e5QuA wonder how much that will cost.....? |
Uninterruptible power supplies
On 25/08/2019 14:50, Scott wrote:
As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Yes but so could a hardware fault or a software crash. This is why you need a good data backup system. It will allow you to recover from a corrupted disk caused by anything. Also UPS systems fail too. |
Uninterruptible power supplies
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Uninterruptible power supplies
On Sun, 25 Aug 2019 14:57:31 +0100, Andy Burns wrote:
a UPS generally does consume a background amount of power, how else do they cook their batteries with heat? My APC Smart UPS 700 doesn't any more. The Friday cut and the much longer one the follwoing Mondy proved that the mods I have made to it have stopped it killing its batteries. It used to kill a set of batteries in around 4 years. After the last lot almost went into literal meltdown (the smell is what alerted me) I made some mods before putting a new set of batteries in. That was March 2014, so without mods they would be dead or next to useless by now. The UPS kept everything it's supposed to up for the 20 odd minutes of the Friday outage. On the Monday it ran for the expected time before shuting down with low battery. The recharge time before switching back on was as expected as well. The mods where reducing the charge voltage, and fitting a temperature controlled fan and possibly some tweaks to firmware settings. A search back in here may well find more details. The amount will vary depending whether it's an offline, online, or line interactive type. At a rough guess I'd say mine takes 15 W +/- 5 W. -- Cheers Dave. |
Uninterruptible power supplies
In article ,
dennis@home wrote: On 25/08/2019 14:50, Scott wrote: As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Yes but so could a hardware fault or a software crash. This is why you need a good data backup system. It will allow you to recover from a corrupted disk caused by anything. Also UPS systems fail too. in the mid 1990s I was working in a building which sat astride the Great Weatern Railway and was a terminus for one of the London Underground lines. One weekend, We were warned that there would be work on our electrical supply so all computer equipment should be turned off. OUr IT people said "don't worry about that we have UPS". On the Monday morning it was found that every UPS had blown up because of over voltage. It was well after 2pm that my computer came back to life. -- from KT24 in Surrey, England "I'd rather die of exhaustion than die of boredom" Thomas Carlyle |
Uninterruptible power supplies
Dave Liquorice wrote:
Andy Burns wrote: a UPS generally does consume a background amount of power, how else do they cook their batteries with heat? My APC Smart UPS 700 doesn't any more. I did a minor adjustment with the "hidden" serial command, can't remember the exact float voltage I set 27.something, whatever the Yuasa spec said, even though they're not Yuasa batteries in it. Mine has 4 of the 18Ah batteries and now the electronics lump at the top of the case still gets warm (it's often running in buck mode) noticeably above ambient, but the battery lump at the bottom of the case is nowhere near as warm. The Friday cut and the much longer one the follwoing Mondy proved that the mods I have made to it have stopped it killing its batteries. It used to kill a set of batteries in around 4 years. Mine were last changed july 2015, I no longer do the weekly test, but they worked last time I checked. After the last lot almost went into literal meltdown Only seen that when someone had fitted "alarm" batteries, rather than "NP" batteries. At a rough guess I'd say mine takes 15 W +/- 5 W. I think mine was about 30W for a SU2200 plus the same again for an 8 way smart PDU, but then I realised I didn't exactly need to remotely power-cycle individual kit, so I no longer use that. |
Uninterruptible power supplies
Andy Burns wrote:
I did a minor adjustment with the "hidden" serial command, can't remember the exact float voltage I set 27.something, whatever the Yuasa spec said 54.05 volts. |
Uninterruptible power supplies
On 25/08/2019 19:34, dennis@home wrote:
On 25/08/2019 14:50, Scott wrote: As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Yes but so could a hardware fault or a software crash. This is why you need a good data backup system. It will allow you to recover from a corrupted disk caused by anything. Also UPS systems fail too. Decent servers have two power supplies. Wise IT people connect one to the raw mains, and the other to the UPS, so if either fails it keeps going. Andy |
Uninterruptible power supplies
On Sunday, 25 August 2019 19:57:13 UTC+1, Dave Liquorice wrote:
On Sun, 25 Aug 2019 08:55:48 -0700 (PDT), tabbypurr wrote: Even if UPSes were 100% efficient, they would still not be practical for grid backup. That'll be why 450 MW (ish) of battery was called upon to help keep the grid up the other Friday. Mind you it's not been stated for how long said "battery" could supply that power... The costs, pollution, energy consumption in manufacture and vast demand for lead would be problematic. More likely to be lithium than lead. But isn't there some other weird and wonderful battery technology about using molten sulphur or something? Half a gigawatt is a long way from running the grid NT |
Uninterruptible power supplies
"Scott" wrote in message ... I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? Depends on the type of UPS. The best of them charge the batteries all the time and use the batteries to power what it is powering, so all that happens on a mains failure is the batteries stop being charged. Those clearly do waste some power all the time. The other sort that switch over on a mains failure only waste power when replacing the self discharge. As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Not when defragging. It can happen when flashing the bios. With updates, it depends on whether you have a full backup etc. |
Uninterruptible power supplies
wrote in message ... On Sunday, 25 August 2019 14:50:37 UTC+1, Scott wrote: I was watching an item on TV about use of batteries to balance the national grid. I have also heard it said that the supply is likely to become less reliable with increased dependence on renewables. I have always assumed that an uninterruptible power supply must be energy inefficient for the same reasons as stand-by uses electricity. Is this a correct assumption or does a UPS not consume any electricity at all unless it is brought into use? The battery charger is not 100% efficient. Once fully charged the battery is often then overcharged continually. Turning 12v or 24v back to 110/230v is also not entirely efficient. As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? For sure, your filesystem can be totally borked - though it usually survives unharmed. NTFS has been much hyped as more robust in this respect, but it's only a limited subset of data that gets duplicated, so it's almost as vulnerable as FAT32. Its easy to defrag so no mains failure will bork anything. Roger summed it up very well with "Yes, but only journalists who can't do sums, and battery manufacturers, see a major role for batteries in solving this problem." Even if UPSes were 100% efficient, they would still not be practical for grid backup. But they can be viable to help with when a wind farm drops off the grid for whatever reason and provide a replacement for that short term loss from the grid until it reconnects. The costs, pollution, energy consumption in manufacture and vast demand for lead would be problematic. The dont supply the entire feed to the grid. |
Uninterruptible power supplies
wrote in message ... On Sunday, 25 August 2019 19:57:13 UTC+1, Dave Liquorice wrote: On Sun, 25 Aug 2019 08:55:48 -0700 (PDT), tabbypurr wrote: Even if UPSes were 100% efficient, they would still not be practical for grid backup. That'll be why 450 MW (ish) of battery was called upon to help keep the grid up the other Friday. Mind you it's not been stated for how long said "battery" could supply that power... The costs, pollution, energy consumption in manufacture and vast demand for lead would be problematic. More likely to be lithium than lead. But isn't there some other weird and wonderful battery technology about using molten sulphur or something? Half a gigawatt is a long way from running the grid It isnt meant to run the entire grid. |
Lonely Psychopathic Senile Ozzie Troll Alert!
On Mon, 26 Aug 2019 14:33:45 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: It isnt meant to run the entire grid. Oh, ****! And this little thread was Rodent-free, so far! tsk -- Richard addressing Rot Speed: "**** you're thick/pathetic excuse for a troll." MID: |
Lonely Psychopathic Senile Ozzie Troll Alert!
On Mon, 26 Aug 2019 12:13:22 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: Its easy to defrag so no mains failure will bork anything. YOU need your brain defragged (in a loony bin) occasionally, senile asshole troll! -- Marland answering senile Rodent's statement, "I don't leak": "That¢s because so much **** and ****e emanates from your gob that there is nothing left to exit normally, your arsehole has clammed shut through disuse and the end of prick is only clear because you are such a ******." Message-ID: |
More Heavy Trolling by Senile Nym-Shifting Rodent Speed!
On Mon, 26 Aug 2019 11:54:27 +1000, jeikppkywk, better known as cantankerous
trolling senile geezer Rodent Speed, wrote: With updates, it depends on whether you have a full backup etc. YOU need your medication updated, senile asshole! BTW, have you tried these pills already: https://thetravellingtiles.files.wor...b6f9820001.jpg -- about senile Rot Speed: "This is like having a conversation with someone with brain damage." MID: |
Uninterruptible power supplies
On Sun, 25 Aug 2019 21:01:19 +0100, Andy Burns wrote:
My APC Smart UPS 700 doesn't any more. I did a minor adjustment with the "hidden" serial command, Hardware mod on mine. If there was a firmware tweak it either didn't do what it said it would or had undesirable knock on effects. I have vague memories of the latter. Mine has 4 of the 18Ah batteries and now the electronics lump at the top of the case still gets warm Once I have a bit a spare cash I might get a set of batteries for the SU2200 I have sitting doing nothing... (it's often running in buck mode) It was getting the UPS that alerted me to the fact our supply voltage was high. Plugged it it, straight into voltage reduction mode, measure supply close to 250 V, rang DNO, engineer at door inside two hours, they measured agreed it was high, came back within a couple of days and andjusted the tapping on "our" pole transfomer. Voltage now 240 and, at that time, the consumption of incandescent light bulbs noticably dropped... -- Cheers Dave. |
Uninterruptible power supplies
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Uninterruptible power supplies
In message l.net,
Dave Liquorice writes On Sun, 25 Aug 2019 15:22:34 -0700 (PDT), wrote: The costs, pollution, energy consumption in manufacture and vast demand for lead would be problematic. More likely to be lithium than lead. But isn't there some other weird and wonderful battery technology about using molten sulphur or something? Half a gigawatt is a long way from running the grid True but it might be the half a gigawatt of dispatchable that keeps the frequency up just enough... Not seen one lately, but there have been a raft of adverts looking for roadside space next to high voltage supplies. Flavour of intent here.. https://www.ukpowernetworks.co.uk/in...uments/SNS1.2_ SDRC_9.1_Design_and_Planning_Considerations_Report _v2.0.pdf -- Tim Lamb |
Uninterruptible power supplies
On Mon, 26 Aug 2019 10:10:53 +0100 (BST), "Dave Liquorice"
wrote: On Sun, 25 Aug 2019 21:01:19 +0100, Andy Burns wrote: My APC Smart UPS 700 doesn't any more. I did a minor adjustment with the "hidden" serial command, Hardware mod on mine. If there was a firmware tweak it either didn't do what it said it would or had undesirable knock on effects. I have vague memories of the latter. We have several (mainly APC) UPS's here and my normal test to their efficiency (outside plugging them in my power meter socket thing) is how warm they sit when idle. Most of them are 'just warm' but I would be interested to learn if there was a specific procedure to lower the risk of overcharging the battery (assuming such hasn't already been applied as they are all s/h). We have one 'Back-UPS CS 350 (that is on 'Her' PC) and several 'Back-UPS 650's'. Ironically my Windows Home Server has sat there ~10 years but not on a UPS and has survived several power outages over that time with no issue? Mine has 4 of the 18Ah batteries and now the electronics lump at the top of the case still gets warm Once I have a bit a spare cash I might get a set of batteries for the SU2200 I have sitting doing nothing... I also have a 1000 and 1500 VA APC 'Smart UPS's' but like you I'm waiting for some spare cash (or reason) to get some batteries for them. ;-) Cheers, T i m |
Uninterruptible power supplies
On 25/08/2019 21:47, Vir Campestris wrote:
On 25/08/2019 19:34, dennis@home wrote: On 25/08/2019 14:50, Scott wrote: As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Yes but so could a hardware fault or a software crash. This is why you need a good data backup system. It will allow you to recover from a corrupted disk caused by anything. Also UPS systems fail too. Decent servers have two power supplies. Wise IT people connect one to the raw mains, and the other to the UPS, so if either fails it keeps going. Andy Decent systems have more than one server and more than one UPS. |
Uninterruptible power supplies
T i m wrote:
We have several (mainly APC) UPS's here and my normal test to their efficiency (outside plugging them in my power meter socket thing) is how warm they sit when idle. Most of them are 'just warm' but I would be interested to learn if there was a specific procedure to lower the risk of overcharging the battery Probably only applies to Smart-UPS rather than Back-UPS, but have a look http://www.jjoseph.org/notes/apc_smartups_battery_float_voltage |
Uninterruptible power supplies
On Sun, 25 Aug 2019 14:50:32 +0100, Scott
wrote: snip As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Possibly, depending on how well it could recover automatically from such etc, but depending on how the power is cut / re-connected, might damage the electronics themselves. Therefore, having a UPS between the supply and your electronics, may act as a buffer / filter or the UPS could act as a sacrificial link. I looked after a small office as a favour for a friend (because I enjoyed / missed it) and I covered his PC's and servers with a spattering of UPS's and the APCUPSD utility. I need to look into that (and NUT?) to cover several boxes (RPi / PC's running OMV NAS software) and possibly the Synology box, as only one can be physically plugged into the UPS at a time? Cheers, T i m |
Uninterruptible power supplies
On 26/08/2019 10:18, Dave Liquorice wrote:
On Sun, 25 Aug 2019 15:22:34 -0700 (PDT), wrote: The costs, pollution, energy consumption in manufacture and vast demand for lead would be problematic. More likely to be lithium than lead. But isn't there some other weird and wonderful battery technology about using molten sulphur or something? Half a gigawatt is a long way from running the grid True but it might be the half a gigawatt of dispatchable that keeps the frequency up just enough... 2GW probably would have, but we don't know for how long the batteries could supply it for. This is going o be the next "con".. FITs for installing batteries. It effectively government borrowing but it doesn't go on the books and the consumers pay for it in the end. harry will have one of them as soon as he can make enough cash from it. |
Uninterruptible power supplies
On Mon, 26 Aug 2019 11:23:53 +0100, Andy Burns
wrote: T i m wrote: We have several (mainly APC) UPS's here and my normal test to their efficiency (outside plugging them in my power meter socket thing) is how warm they sit when idle. Most of them are 'just warm' but I would be interested to learn if there was a specific procedure to lower the risk of overcharging the battery Probably only applies to Smart-UPS rather than Back-UPS, but have a look http://www.jjoseph.org/notes/apc_smartups_battery_float_voltage Thanks Andy, bookmarked. Cheers, T i m |
Uninterruptible power supplies
T i m wrote:
On Sun, 25 Aug 2019 14:50:32 +0100, Scott wrote: snip As an aside, could a power cut ever damage a modern computer (say if you happened to be installing an update or defragmenting a disc when it happened)? Possibly, depending on how well it could recover automatically from such etc, but depending on how the power is cut / re-connected, might damage the electronics themselves. Therefore, having a UPS between the supply and your electronics, may act as a buffer / filter or the UPS could act as a sacrificial link. I looked after a small office as a favour for a friend (because I enjoyed / missed it) and I covered his PC's and servers with a spattering of UPS's and the APCUPSD utility. I need to look into that (and NUT?) to cover several boxes (RPi / PC's running OMV NAS software) and possibly the Synology box, as only one can be physically plugged into the UPS at a time? Cheers, T i m I think anything that can run apcupsd can be networked easily to the box controlling the UPS. Remakably painless. It's only worth using NUT (which can allegedly follow an apcupsd server) if there's something like a NAS you can't install apcupsd on. NUT is less painless. -- Roger Hayter |
Uninterruptible power supplies
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Uninterruptible power supplies
On Monday, 26 August 2019 13:25:36 UTC+1, Roger Hayter wrote:
I think anything that can run apcupsd can be networked easily to the box controlling the UPS. Remakably painless. It's only worth using NUT (which can allegedly follow an apcupsd server) if there's something like a NAS you can't install apcupsd on. NUT is less painless. sounds like a pain in the .... |
Uninterruptible power supplies
On Mon, 26 Aug 2019 17:59:30 -0700, tabbypurr wrote:
On Monday, 26 August 2019 13:25:36 UTC+1, Roger Hayter wrote: I think anything that can run apcupsd can be networked easily to the box controlling the UPS. Remakably painless. It's only worth using NUT (which can allegedly follow an apcupsd server) if there's something like a NAS you can't install apcupsd on. NUT is less painless. sounds like a pain in the .... I'm controlling three UPS units here with nut. I have done for years. It just works. Setting it up is a bit involved but not hard. There's a good README. And once done, it's done. -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
Uninterruptible power supplies
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Uninterruptible power supplies
On 27 Aug 2019 08:54:14 GMT, Bob Eager wrote:
On Mon, 26 Aug 2019 17:59:30 -0700, tabbypurr wrote: On Monday, 26 August 2019 13:25:36 UTC+1, Roger Hayter wrote: I think anything that can run apcupsd can be networked easily to the box controlling the UPS. Remakably painless. It's only worth using NUT (which can allegedly follow an apcupsd server) if there's something like a NAS you can't install apcupsd on. NUT is less painless. sounds like a pain in the .... I'm controlling three UPS units here with nut. I have done for years. It just works. Setting it up is a bit involved but not hard. There's a good README. And once done, it's done. Assuming you have used APCUPSD Bob, how does NUT compare? Does it just work similarly or does it come at the problem from a different direction? Cheers, T i m |
Uninterruptible power supplies
On Tue, 27 Aug 2019 11:09:59 +0100, T i m wrote:
On 27 Aug 2019 08:54:14 GMT, Bob Eager wrote: On Mon, 26 Aug 2019 17:59:30 -0700, tabbypurr wrote: On Monday, 26 August 2019 13:25:36 UTC+1, Roger Hayter wrote: I think anything that can run apcupsd can be networked easily to the box controlling the UPS. Remakably painless. It's only worth using NUT (which can allegedly follow an apcupsd server) if there's something like a NAS you can't install apcupsd on. NUT is less painless. sounds like a pain in the .... I'm controlling three UPS units here with nut. I have done for years. It just works. Setting it up is a bit involved but not hard. There's a good README. And once done, it's done. Assuming you have used APCUPSD Bob, how does NUT compare? Does it just work similarly or does it come at the problem from a different direction? I never used apcupsd, since this is all BSD based. Pretty well the same. A 'master' copy of nut (there are two or three separate parts) monitors the UPS. It has slave copies on the other machines on the same UPS. When the battery level reaches a specified threshold, it tells the slaves and they run a script (usually to shut down). After a short delay, it shuts the server down. There are three master copies here, one for each machine group and UPS. One is a 'super master' that knows about the other two. It includes a CGI script so that a local web server (Apache here) can display the state of all of the UPS units (in and out voltages, battery remaining) all in a nice graphical way. It also allows you to look at (and set) the internal parameters of the UPS. -- My posts are my copyright and if @diy_forums or Home Owners' Hub wish to copy them they can pay me £1 a message. Use the BIG mirror service in the UK: http://www.mirrorservice.org *lightning surge protection* - a w_tom conductor |
Uninterruptible power supplies
Bob Eager wrote:
On Tue, 27 Aug 2019 11:09:59 +0100, T i m wrote: On 27 Aug 2019 08:54:14 GMT, Bob Eager wrote: On Mon, 26 Aug 2019 17:59:30 -0700, tabbypurr wrote: On Monday, 26 August 2019 13:25:36 UTC+1, Roger Hayter wrote: I think anything that can run apcupsd can be networked easily to the box controlling the UPS. Remakably painless. It's only worth using NUT (which can allegedly follow an apcupsd server) if there's something like a NAS you can't install apcupsd on. NUT is less painless. sounds like a pain in the .... I'm controlling three UPS units here with nut. I have done for years. It just works. Setting it up is a bit involved but not hard. There's a good README. And once done, it's done. Assuming you have used APCUPSD Bob, how does NUT compare? Does it just work similarly or does it come at the problem from a different direction? I never used apcupsd, since this is all BSD based. Pretty well the same. A 'master' copy of nut (there are two or three separate parts) monitors the UPS. It has slave copies on the other machines on the same UPS. When the battery level reaches a specified threshold, it tells the slaves and they run a script (usually to shut down). After a short delay, it shuts the server down. There are three master copies here, one for each machine group and UPS. One is a 'super master' that knows about the other two. It includes a CGI script so that a local web server (Apache here) can display the state of all of the UPS units (in and out voltages, battery remaining) all in a nice graphical way. It also allows you to look at (and set) the internal parameters of the UPS. NUT works with many UPSs other than APC ones. But it is not so versatile or reliable in setting parameters of some APC UPSs as apcupsd is. -- Roger Hayter |
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