I worked a battery backup Y2K project back in '99. Covering the server room and close to 50 bank branches, and never learned as much about UPS's as I did in the last 20 minutes. Love going to your school Professor Dave.

@wickedcode007

Жыл бұрын

Dave crushes every topic which is why I have mad respect for the man.

@aaronperl

Жыл бұрын

My dad volunteered to be on call that New Year's Eve. He was convinced nothing bad would happen, and he said he could charge as much as he wanted. I don't know how much he ended up charging, but as expected, nothing did happen, at least not on his watch.

@nathnathn

Жыл бұрын

@@aaronperl some things did happen but it was companies that completely ignored patching the issue beforehand and then acted surprised the thing they’d been warned to patch happened. Personally i never got why in a lot of cases it would even cause any long them issues as its not like most servers had data under 1901. Though anything that referenced back to the previous years may or may not work depending if it would buffer overflow the other direction. And honestly if they worried they could have always run a test server that they’ve manually clocked forward to just before 2000.

Dave, I'm a generator guy among other things. It seems like you once mentioned that you were running a 70kw backup genset. If you haven't already, do a "lights out" test. Kill your utility and let the generator run the house for a few hours or half a day. The UPS's are kicking off some really wild power factor. The old rule of thumb was that the genset needed to be 5x the total UPS load to handle the pf. I've had it bite me a few times. Maybe your generator guy knew how much UPS load you have, maybe not, maybe he sized things ok, maybe not. Either way, test run everything before you have to rely on it.

@wickedcode007

Жыл бұрын

Something to consider when I install a generator, thanks! 🤔

@dennisfahey2379

Жыл бұрын

Interesting. Inrush currents can be insane. I recall hearing when switching power supplies started to become the norm it created massive issues during brownouts. In the old days when your house mains dipped things just shutoff; when it returned they fired back up. But with switching supplies which have very wide operating voltages when you dip due to a brown out the supply compensates by pulling more current. So the brownout goes into avalanche mode as thousands of houses just pull more and more from the grid rather than backing off nicely.

@docferringer

7 ай бұрын

@@dennisfahey2379 Most high-draw appliances nowadays will have a delayed startup time after an outage. Those brownouts will wreck an AC or refrigerator compressor. For older appliances you can buy wall plugs that wait for things to stabilize before powering the appliance and they also shut off if there is a brownout.

Great rundown Dave! In the telecommunications industry we never loaded a UPS or a generator more that 80% of its nameplate kVA. So your 1200W (1500VA) workstation would require a UPS rated at1875 kVA. VERY important to know your loads. Super important point!

@craigpeacock1903

Жыл бұрын

Shame... With computer engineering any computer not running at 100% all the time is considered wasted resources... Should try a real man's field sometime

@wayando

7 ай бұрын

​@@craigpeacock1903... I imagine that the official computer spec normally already has some built in overhead protection. Meaning they can do more than they say they can do ... So the 80% thing is already in there from the manufacturer. With the power systems, when you hit the written capacity, they immediately flash overload and go off ... Meaning they are honest, and you have to do the 80% thing yourself.

I have a garbage picked APC 1400 XL. It's been backing me up for 23 years now. I hard wired it into my main panel with permits on my critical circuits. I got rid of the internal 4x7 Ah batteries and have two 100 Ah external batteries in series. I can't believe it's still working perfectly after 25 years.

@rw-xf4cb

Жыл бұрын

Depends on the outages here when someone sneezes the grid power goes down and often long enough to kill the batteries in my APC700. But saying that I am just about on my second set or 2x7ah replacements and had them since 2016 so about 3yrs a set. I have thought about putting larger AH batteries in place but in the end bought for fun an MPP Solar PIP5048 and 8 300AH batteries and got the place on a manual transfer switch so when the grid goes out don't have to sit in the dark or go to bed early - with latest outage I realized I don't have a simple method to tell when power is back on as all that's a bit remote so looking to run a mix of critical and non-critical loads. The whole place is transferred to the PIP on manual cut over so you cant use heavy appliances or will trip it but its mostly to keep lights and internet up to ride out the outage.

This video is amazingly timely for me. I've been thinking that I should get a UPS for my little home server, just so that I can have it shutdown cleanly (which takes a few minutes, to shutdown all the VMs). My dad worked his whole career in this area, designing large UPS systems like you showed with the rooms full of batteries and diesel generators. He retired about 15 years ago, but got sick with cancer during COVID. I got a chance to ask him about a month ago how I should go about selecting a UPS, and he did seem to perk up as he tried to explain it to me, but he didn't have the energy to really go into it. He passed a week ago, so I only had and incomplete explanation to go on .. until now. He had told me that I first need to find out the power factor, so I've been meaning to pick up a Kill-a-Watt, but haven't done so yet...

@michaelhanson5773

Жыл бұрын

Damn that sucks... Sorry for your loss... This video did do a really good job explaining things though without going into marketing crap and other nonsense...

@mjc0961

Жыл бұрын

Sorry for your loss

@clickallnight

Жыл бұрын

Sorry to hear that about your dad. I lost my mother to COVID. Those remembered conversations and thinking of things you would ask if they were here really lingers

@reoencarcelado5904

11 ай бұрын

@aaronperl: I’m so sorry about your dad 🥺😭😢. My condolences 🥺.

This is probably the best explanation of the various factors affecting UPS selection that I have ever come across, especially concerning Watts and VA, off-line, interactive, etc. The only thing to add (probably a full video on its own) would be a feature on the software options for UPS management (Windows, Linux, environments like Unraid, etc.). For what it's worth, I use my Unraid server for my UPS with the desktop PC as an apcupsd slave.

@michaelhanson5773

Жыл бұрын

And this video actually came at the right time as well since i was in the middle of trying to figure out if the issues i have been having with a new switch is a result of it being sensitive to power fluctuations and what type of UPS i would need to get to hopefully stop a switch from resetting every time the ups returns back to main line power...

@GodmanchesterGoblin

Жыл бұрын

@Michael Hanson Does the switch have an internal or external power supply? I have replaced a couple of supplies on small switches that simply failed due to age / heat / poor component quality. Since the mains supply can be missing for half a cycle or so when your UPS switches to and from the mains (depending on UPS type), it's possibly the switch's power supply that is at the root of the reset issue you are seeing. I would try an alternative supply first if that's an option.

The VA to Watts conversion I never really understood, despite owning and buying several UPS's over the years. Now I do! Thanks Dave!

Electrical engineer here. Very good explanation on real/reactive/apparent power and power factor, congrats. It gets even funnier when you consider the harmonic distortions that typical IT loads impose to the grid. Good UPS systems have filters to mitigate that.

I live mobile and have a few UPSs to backup and filter power here. Super good information and helped me verify I am doing it correctly. Since my place is essentially a faraday cage I tend not to worry but with Summer coming up I think it best I establish a full grounding of the cage. Thank you, Dave for another solid lesson!

To say that lithium batteries have an environmental advantage because they don't have lead might be a bit off. Lead acid batteries are one of, if not the most recycled consumer good in the world. 99% recycle rate. You can drop off lead acid batteries at virtually any auto parts store. (Some even give a store credit if you're not bringing one back as core for one you bought from them!) Lithium battery recycling, while improving, has a way to go.

@JimmyRussle

Жыл бұрын

The lack of Lithium battery recycling is due to the insane amount of disposable devices you can find them in. People just don't bother. In a UPS with lithium battery packs, when those go bad and get e-wasted, they are VERY likely to end up being recycled.

@bdhale34

Жыл бұрын

Lithium battery production is far more polluting than anyone who recommends them seems willing to admit as well. Matter of fact they always seem to completely gloss over (not even mention it at all in in 99% of cases I've seen/read) how dirty actually getting usable lithium is while at the same time criticizing the same aspects in other power sources.

@vismachman

Жыл бұрын

​@@JimmyRussle Agreed on the mobile / small devices being the biggest source of "loss" in the lithium recycle circle of life. The thing would be to incentivize turning them in for recycle instead of tossing in the trash. That's what happened with lead acid batteries. They started adding a core charge to new unit purchases, and as I said before, some places offering credit / $$ even if it wasn't a core return for a purchase made at that establishment. Note that I am in favor of lithium batteries as a whole, and do plan on converting my UPSs over to LiFePo4 the next time the lead acid units need replacing. Would have done it the last cycle, but the projected cost per year of service was still too high in comparison to lead acid.

@xeobit2781

Жыл бұрын

Yes I was looking for this comment! Is one of the main advantages of lead acid batteries aside from safety

@wickedcode007

Жыл бұрын

Good point and lithium brings different issues and agree the recycling of lead acid is far ahead of lithium.

Thank you so much for making this! Hugely informative. I'm going to bookmark this for future reference and share it with others.

on my servers at work a have two ups, each running from a different phase, and each feeding one of two redundant PSU in the servers. This allows to loose a phase, or an entire UPS and still have the system up and running.

I kept wanting to listen to this later but was learning so much I stayed and stayed! Thank you.

The following is more info than you need in your video but a few may be interested: Your example of what manufactures call modified sine wave (more like modified square wave) is very generous. Most products with modified sinewave use a square wave with 3 levels: max positive, short time at 0, max negative, then back to 0 for a short time in a way that averages to the usual AC rated voltage. Some may use 5 levels so they have a half step positive & negative added (each used twice per cycle). For a given resistance, the AC RMS voltage is equivalent to the same amount of DC voltage through the same resistance giving the same power flow, but sinewaves make it complicated. AC voltage sinewave means it goes higher than that RMS average for some of the time but the non-RMS average (if you divided cycle time into 12 or more evenly spaced samples) is slightly different to the RMS average.

When you put out the most useful video on April 1st. I needed this video a few months ago. Glad to have it sir.

This is an absolutely fantastic video! Thanks for all the effort it took to produce this.

Fantastic, concise, thorough, and to the point UPS video. Loved it! Thanks!

Great vid...clear & concise covering all of the various options. Thanks!

Thanks for sharing the specifics of what you do at home for power protection. I trust your opinion and find it helpful.

Great Video Dave. Love your life knowledge. God bless you in anything you do.

Thanks for a very informative video. This will help me spec a UPS for my networking system that i put off for years now.

@Dave's Garage - I've always relied on an UPS to protect my desktop PC. But to save myself some money, I bought a used small capacity UPS unit and connected it instead, to two high capacity 12v leisure batteries wired in series, thus replacing the two original internal series wired lead acid cells. The UPS easily keeps my desktop PC, two monitors and router running for much longer than normal as a result.

I upgraded our UPS at work, and am so happy with it. We have power outages all the time downtown, and it was sooo annoying to get calls randomly 2-3 times a month. Especially during thunderstorm season. I got one that is 3000VA to run our 2 servers, the switches and the router. It's overkill, but it wasn't that expensive compared to one at half the price. My rule of thumb for anything electronic, is always get a power supply/UPS that is double what is needed. That way, they'll tend to run more efficiently.

Thanks for the excellent overview of UPS, I use them at work and at home. At work we run a dual 600 KVA Online UPS system into separate switchboards and then dual power all the equipment from each UPS, because UPS do fail sometimes. We also run some dual power systems with UPS and Raw, Again although the Raw power fails more often, we have had the UPS fail and Raw power keep going so critical services stay up. A Minor correction at 19:42 when you were talking about your fathers IBM UPS having huge banks of 1.5 V Lead acid cells, I would observe that Lead Acid cells have a nominal voltage of 2 Volts per cell and a low to high range of 1.85-2.35 Volts. This is why a 12V battery has 6 series Cells.

Used online UPS units are usually pretty cheap because companies switch them for new units whenever they install new servers. They will need new batteries but those can be cheap if you buy from a wholesaler in bulk. One thing I can’t recommend enough is setting up a NUT server to shut down all your computers and servers even if they’re not connected to the USB port of the UPS.

@DavesGarage

Жыл бұрын

Yup, I've bought a few off eBay and then just put a new battery in it.

@BorkToThe3rd

Жыл бұрын

This is what I did. Got a Tripp Lite 3000VA online UPS rack mount for under $200 and found batteries for $150. It is showing a 10% load for the whole server rack!! (Only minor whining point is the WEBCARDLX managment card costs about as much as I paid for the whole UPS.)

@philarmishaw3730

Жыл бұрын

@@BorkToThe3rd don’t bother with network card, just use NUT server. Once you get it setup it’s easy to add new clients.

@SomeMorganSomewhere

Жыл бұрын

@@DavesGarage Yup, that's where all of my UPSes came from including the rather large 6kVA online unit with the 240V DC bus (and about a quarter tonne of batteries after I was done with it) which I ran basically my whole house off through a number of 2+ hour power outages when I was living in a place with really bad power (mostly in summer because of all the A/C's, reason I went so big was so I could run MY A/C off it ;) ). Currently running an 3kVA online SmartUPS (oldschool, commercial-grade, pre Schneider) and a 3kVA dual-conversion Eaton unit (each on a separate, dedicated circuit) in my rack that feeds out to outlets in my study.

The info delivery here is on point

Very helpful, thank you!

Good video Dave! So many things require electricity and there is incredible risk involved with incorrect usage.

Nice down to earth explanation on the subject that many people (myself included) don't completely understand when they need to buy an UPS.

Great video sir. Very informative, thank you! Subbed

Great video as always Dave. When i upgraded my whole computer system 2 years ago, first thing after buying my gear I looked at was a ups system... Peace of mind was my overriding factor for power outages whilst I am using the system and came with a guarantee if the shit hits the fan and I do get an actual surge I am covered for up to $20,000 of damages for ten years. Now that's peace of mind 😉.

Great video. If you do a follow up episode it would be interesting to cover: - the difference between LiPo cs LiFePO4 - interactions between UPS and whole-home battery like Powerwalls

VERY informative, Dave. I will send a link to everyone I have talked to about UPSs and their absolute need. Hell, I have at least 8 in my house alone, guarding every sensitive device. Thanks again.

Thanks! Good info.

80% power factor and 80% max long-term load are good rules of thumb. Plug your dual power supply servers and switches into a UPS-backed PDU and a grid-backed PDU. Make sure the PDUs run consistently ≤ 40% so that if the grid fails, the UPS will handle the full load and the PDU will be running ≤ 80% rated load. Just remember that the load and runtime listed on the UPS will be halved if it becomes active

Dave this is a fantastically complete review of all UPS types and technologies. I suffered through learning all this the hard way with older technology UPS units in the 90s and 00s. Back then it seemed that the manufacturers all set the battery charging voltage too high so that the battery would prematurely fail. Your video mentioned but didn't dive into the "costs" of power issues. That'd be another great video topic. Please keep up the great videos... always very informative, and your production quality makes watching them very enjoyable!

Thank you thank you for explaining the difference between "Online" and the other two types. I've spoken to so many IT and facilities professionals who have no idea what the difference is and it's a very important distinction to make especially if you have the possibility of dirty power from the grid or a questionable genset.

Thank you for this great explanation. Would like to see some links in the description of some of the equipment that you use.

Thanks for the info!

Hey there's PF and VA right there on my Kill-ah-watt! About half way through...still listening to this.

Wow that was thorough

Interesting subject thanks

Great overall guide to UPS selection. As long as it needs to be but not longer.

I wish I found you a long time ago. Great channel.

We learned some basics about VA and Reactive Power in DC/AC circuit analysis class. Trying to get an associates degree in electrical engineering. Its cool to finally have an idea of what you are talking about for a change :)

Solar Powered Threadripper -- that's a name for my new Band.

This was a great video, thanks! Can you go into detail about connecting these, or other UPSs to a computer (Mac/Win/Nix) and properly get shutdown signals?

Excellent explanation of what they do and how they work! I personally use a unit big enough to run my entire work space (4 computers, 12 monitors, 2 printer, all of my led work lights and other miscellaneous devices) for between 3.5 at full load and almost 7 hours with minimal load. Even for basic home users I highly recommend having one for any desktop computer.

@dh2032

Жыл бұрын

yes, new information, I did not know existed or was a thing UPS I thing is more completed than small computer, them small UPS, large computer, the larger UPS, ?

@d3xbot

Жыл бұрын

Just remember: don't plug laser printers into undersized UPSes. You can cause house fires that way

Thanks Dave.

Hot dang. Dave is a mind reader. Im in the process of shopping for a new UPS and this gets published 9 hours ago.

People often forget cooling power when designing a whole room UPS. One place I worked had around 50-60 servers that were used for development and QA. The UPS took one whole rack, with 3 racks for the batteries. One day the power went out and we discovered that the room was simply too hot to leave the servers on. Turned out someone forgot to pay the utility bill and it would be over a day to sort out. The batteries would have run the servers that long. or so it was said, but with the AC would have been good for only 4 hours or so .

Just like the book, the explanation I wish I had before buying my UPS. Mine is amazing and all, but I think I could've spent less, even while this is an old model. Thanks, Dave!

You're a prince, Dave. Thanks!

Thanks for explaning these things. Am in the market for one (or 2). New teleprompter?

I got my hands on a free APC 750VA unit because the batteries were knackered .... It's now modified with better heatsinking / fan cooling and running from 3 x 12v car batteries charged from my 2 240W solar panels. it runs my old 4770K workshop pc for ....well its never run out yet despite using it for well over 4 hours at a time also powers the network switches and router but they're loads are very small in comparison.

I just bought a 1500 VA APC lithium unit due to time. Just had to power a Synology and a few switches. When I get the time, I am going to adapt small 12v Victron inverters coupled with 4 cell LiFePo4 batteries.

I have the same APC smart-ups 1500 that you showed in my house for my server rack. I doubled its battery capacity by adding 2 more batteries. Keeps my rack of switches online and internet for around 6 hours if I want or server for about 2 hours. I have a whole home generator but it's manual transfer.

COOL, that what i looked for, even Germany we can concerned about black outs. Thanks!

I used to work for a UPS manufacturing company called Galatrek Int'l, they manufactured the 6min backup for desktops all the way up to full cabinet versions supporting Hospitals, Water treatment plants to name but a few...

@fss1704

Жыл бұрын

Cheez'us, 10c is torture.

UPS's have gotten me through several power outages and surges. I also have my entire home theater protected by a UPS since if any parts of that fail they can't be repaired like a PC and would be a pain to swap out.

In a town full of furniture manufacturing, we found the voltage protection against sags, especially in plants that already had low voltage (105 a lot of times) and equipment turning on randomly, kept data from corrupting overtime. Boss swore he had to reload Windows at least yearly till he started running with a UPS.

Thank you so much for this. I wish this had existed a couple years ago when I was shopping for a UPS. I did eventually figure out that I wanted line interactive since online wasn't in the budget, and that I wanted a proper sine wave for my gaming PC. I never could figure out a proper explanation of VA though, just that it's "capacity", so I ended up just getting 1500 VA since it the highest capacity available in what I was considering and I'd rather have too much than not enough.

I came here for the brown trucks.

Cool, thanks man!

excelllent discussion of power factor but do not forget inrush to capacitive or inductive loads. inductive loads with large transformers can have enough inrush to trip breakers do to resetting the core polarity

You said they have surge protection - well - that's a "maybe". In my last job, we had three GE UPSes - 15kVA or so - and a longer offline job was planned. Since we didn't have a generator, we hired one from the power company. They came and put it outside, laid down the cables and switched off the main power - the UPSes took over. Then they powered up the generator and for some reason, it sent a 4kV pulse into the UPSes, which paniced and went into passthrough and sent it all into the datacentre. Popcorn time! Quite a few PSUs were fried among with some disks. IIRC no motherboards were damaged. Interestingly, the stack of SuperMicro machines just buzzed on through this mess - nothing even in the logs. Good PSUs on those.

I did service on ups for 300,000ft building. We had industrial jumper cables, crazy arcing!

I found out the hard way that line-interactive has another drawback, you have to get much bigger than you think you need. I had one loaded to about 80% but when the power failed the surge from the capacitors in the PSU draining during the switchover caused it to overload when they tried to charge back up again.

Great overview. Loved the simple explanation of power factor. Try the conversion of transmitter power to ERP (Effective Radiated Power. Hox you can put a bunch of RF into a conduit and get four times that power out makes the "free energy" crows drool all over thenseves. We were feed 440 three phase at 60Hz. KCP&L (our local utility) would drop a phase on us without warning and smoked our input transformer. Those were over a grand apiece in the 80's. I built a "crowbar" curcuit. Three transfomers (440 volt to 120 volts), three relays with contacts in series, and a heavy duty three phase contactor. If one phase drops the contactor opened in way under a second.👌

@uploadJ

Жыл бұрын

re: " Try the conversion of transmitter power to ERP (Effective Radiated Power. ... a bunch of RF into a conduit and get four times that power out makes the "free energy" crows drool all over thenseves." Prime failure here is know that it is in ONLY the direction of desired 'coverage' where this increase occurs. The other area loses EIRP ...

@crankshaft3612

Жыл бұрын

@@uploadJ Yes, it is a theroretical increase not a real one. But it reminds me of all the "free energy" crap that you see.

@uploadJ

Жыл бұрын

@@crankshaft3612 Well, it is an increase, but only in a limited, predetermined area and at the 'cost' of another 'area' of coverage (speaking geographically now) ... but you get the concept. In the case of a vertical omni antenna, it is useful, as coverage at high elevation angle is useless for persons 'on the ground' or surface of the earth. Antennas designed to talk to aircraft, though, need the high elevation angle ...

An important feature to look out for is the hold-up time at the intended load, I've just seen a cheap UPS offering 1 minute hold up time at rated VA, which is probably not long enough for an instant orderly shut down. As ever the issue is trying to better the usual mains MTBF while having the facility to switch out batteries or a whole UPS. A really good UPS will be tracking the mains waveform to cut in with little noise and sync to an incoming AC waveform for a clean zero voltage point change back to mains or generator.

awsome video! learned alot and it is helpful not to dig around for infos! tnx! :)

I currently have pure-sinewave line interactive units backing up my desktop computer and some of my networking gear. So far this has seemed fine for me, but I wonder if I should go a different route.

I use the APC 1500VA Smart UPS like you on my workstation. An AMD 7900X and 4080 FE. I took my 3960X and tossed it into a server chassis running XCP-ng. My rack has a V7 (3000VA)

Been working around the APC UPSs for over 20 years now. All that they guarantee is every 3 years your server will lose power when the battery goes dead.

@necronom

Жыл бұрын

Yeah. I have a low opinion of UPSs. I've only used APC ones, but they seem to cause power problems, and since we almost never lose power they have almost never saved anything. Overall we have had much more problems having UPSs than if we hadn't bothered.

@daviddeakin2172

Жыл бұрын

Amen to this comment. Having also worked in it for 23 years I too have experienced more power losses caused by APC UPS failure rather than the grid. YMMV on other brands but APC are not alone in what seems like poor design.

@scottyno03

Жыл бұрын

Have had the same experience with APC UPS. Have stopped production a few times due to the UPS suddenly dying.

@zaphodbeeblebrox2911

Жыл бұрын

They seriously caused more problems than they solved at my hospital. We abandoned ever replacing the SLA batteries because the electronics failed so often. Not even going to mention the medical grade "smart" power strips we had to use that disconnected as soon as the USP fired up...🙃

@Slay_No_More

Жыл бұрын

Are they dangerous by chance? I got one between my legs under my desk. I'm afraid of the batteries going off

Great video

So happy you touched on Generators. I do nto have a whole house yet. I purchased and setup a 15000watt generator at 50 amps to run things in the house like my well, and internet and some lights. Turns out I only use about 40-50amp at most> I can run the whole house with exception of my water heater.I have 11 Cyberpower UPS. Turns out only 2 of them are sinewave and all others will not work on the generator since its dirty power. The 2 sinewave work. UGH, had to learn the hard way. I will get a Generac 24kw in the late summer and all should be fine. From now on, I will purchase only Sinewave/Smart App units that aid in this transfer and will continue to power and protect. Anyhow, thank you for the explanation.

I have a standby gen with an ATO, so the vast majority of the UPS units I have around the house are very small. Generally, they are under 600VA with a couple being only 425va. Those small units are more than enough to power AV equipment and networking equipment for a minute or two until the standby gen set starts providing power. For my desktop, I have a 1500va/1000w model. The bad news is that if you need to power a 13900ks paired with a 4090, you may need a larger unit than a 1000w UPS and the prices go up dramatically once you get past 1500va/1000w.

@iankester-haney3315

Жыл бұрын

I have a 12900K w/3090 and 10980Xe w/2080Ti protected by a big UPS. Running on a dedicated 20Amp circuit. Luckily I have a backup generator (nat gas) that picks up within a few seconds. Lots of smaller units on POE switches and network.

This is why I have my Rackmount 1540W UPS on a dedicated circuit. It only has to cover for a few seconds while the Gas Generator kicks on automatically. I put all my Network gear, POE switches and Rpi Servers on UPSs as well. Not dropping my main Machine amd network during a power outage. Same reason I currently have both FiOS and Xfinity services with Failover and VLAN routing for streaming.

@bobbydazzler6990

Жыл бұрын

Q1. How does "VLAN routing" improve the availability of your setup? Q2. VLANs are a Layer 2 construct while routing happens at Layer 3 so what exactly is "VLAN routing?"

@wickedcode007

Жыл бұрын

Smart!

As someone that did environmental systems for computers, I have been trained on computer power. One of the things that I was taught is to NEVER feed a UPS with a UPS. One UPS will fight the other. You can see this if you look at the current and voltage between the two UPS. Almost every time I've seen this done, it has caused problems. The exceptions were the computer room sized Liebert UPS that can handle 100kW and more. But there you really didn't need the second UPS. Still, while I know that specific APC UPS, I know nothing about the Ecoflow. Maybe it was designed to handle a UPS. Most standard UPS can't handle powering a UPS or being powered by a UPS. But I am willing to update my recommendations. So here it is: Unless you have Dave's budget and expertise, never feed a conventional USP with a conventional UPS.

thanks

I have always been too lazy to research the VA information you provided. Thanks

5:47 "It sounded like imaginary numbers to me." I had quite a chuckle at this since VA consists of a real part (W) and an imaginary part (VAr) in the complex number space.

Plugging your home/office router into a UPS means that you can have internet/phone when the power is down. Even a small UPS can keep your router running for a long time.

Given the number of UPS's you need to have (basically running like an office) would you ever consider a whole house battery backup with an additional Solar charging system?

I've been running an EATON 1500VA 5S1500LCD for sometime. I added my own larger batteries to get well over 4hrs at 300watts

Another alternative is a low voltage ups, i build one for my rack at 12 V, the microtic switches working at 12 V and my Microserver has a MicroPSU, the POE Injectors are even using 12V, the benefit of a lower power System is that the efficancy is much better, i have only one longlive power supply with 12V, which works constant at a point where it is at > 89% efficancy, although the runtime at power lost is mich longer, the dc supplys are all very efficant compared to the dc to ac and dc to ac conversion from normal UPS. My UPS has even a usb/serial connection for monitoring it is recognized by the os as normal UPS. I even build one for work at production testing systems with an intel NUC it just works great and has a runtime of 12 hours, equipt with LiFePo4 batterys. I can just recommend it, there are even 12/24V UPS ATX supply’s for this.

Thanks Dave. That is the most impressive talk about UPS that I have ever heard in 70 yrs of ac & dc systtems working. Yes, VI Cos theta / thi is the way to calculate for the "imaginary" element which is as you said the A vs V differential phase. But you did slip in a short comment about 3 phase. Are there really requirements & solutions that are 3 phase mains? Servers or data banks I assume. Well done for being so pedantic.. Others could learn a lot from your great talks.. About time you polished gramps old truck.

You'll be amazed how most of UPS behave when tested with oscilloscope during heavy load or using power tools/other parasitic sources near them

@DavesGarage

Жыл бұрын

I know... and you should hear my air compressor when run off a square wave inverter! Sounds weird!

@wickedcode007

Жыл бұрын

Ill be hooking up my scope to get insights here, thanks for the tip!

@wickedcode007

Жыл бұрын

@@DavesGarage I thought square waves would shorten the life of heavy inductive loads. Thoughts?

@GbpsGbps-vn3jy

Жыл бұрын

@@wickedcode007 I'll be more panicked about how my computer's PSU withstand against the UPS with modified sinewave or UPS that failed. Usually at power outage some of them behave badly against active PFC supplies (especially those with low hold time and shitty filtering design (15-20ms is ok, can't remember what ATX specs say)

@volodumurkalunyak4651

Жыл бұрын

@@GbpsGbps-vn3jy ATX spec is 17ms, at 47Hz and full load and minimum input voltage. Translated from specs to real data could mean somewhere in the region of 15ms at 60Hz mains to 20ms at 60Hz (a bit shorter than full mains cycle to a bit longer). If specs were to take PFC into account, than those could be following: "17ms, at 47Hz and full load and any input voltage".

To be honest most of devices using power electronics should withstand one skipped AC cycle under full load. 1ms switchover time is just nothing for them (unless device is severely derated due to aging).

Good low-down - but.... The story starts with surge protection. Having correctly installed surge protection devices (SPDs) is an essential element. They should be installed in the consumer unit - or 'panel' and be connected to all supplies. In Australia - we connect them to all three in-coming phases (3 of them) and bond then to a main bond. We configure for 64A of surge current for domestic supplies - or 200A commercially. from there - we have bonded secondary SPDs in comms racks, computer rooms, building services rooms, pumps, etc.. They are also protected by an equipotential bonding arrangement. This way, the UPS shouldn't see much over 150V US or 300V/phase in the rest of the world.

I have a smaller UPS that my ISP provides (and maintains) for my network gear. I run line conditioners on all my electronics. Even have one on my refrigerator. These line conditioners are not just cheap MOVs that only deal with spikes. These clean up the AC and correct under and over voltage situations. Tripp Lite LC1800 or something similar. You can get 120V and 230V versions. When power goes out my network runs on UPS and I use my laptops.

I recently learned a good visual example of Power Factor. You pour a glass of beer to full. The bottom 3/4 of the glass is beer and the upper 1/4 is foam. So the PF would be .75 as the good stuff is at the lower 3/4

As a 13 year APC employee, great video !!

@DavesGarage

Жыл бұрын

Awesome! Thank you!

I modified an APC smart 3000VA rack unit with custom firmware to use deep cycle marine batteries. I have 8 giant batteries for a total of 400ah at 48volts. I can survive a decent power outage with my whole network powered... I do have to keep them topped up with distilled water about once a month. They are also heavy AF.

Car audio amplifiers and subwoofers are great example of a/c reactive load. Lots of KZread channels test the amplifiers on amp dyno that’s a resistive load giving you s best possible power output of the amp at specific ohm loads also a good stress test on the amps to see if they are quality built or go up on smoke😂

Thank you. Awsome. Just a small advice. I need an ups just to power my synology and my router. Nothing else. And I need power for an hour maybe. Do I need pure sine wave or can I get by with a quality apc or cyberpower stepped sine wave? I figure since synology has an external psu that converts AC to DC pure sine wave isn’t crucial.Or….

I have an UPS. Last year, PG&E threatened to shut down electricity. I think I'm too close to the Apple HQ. The UPS started to go click-bzzzz-click-bzzzz. I thought the UPS was dying, but it turns out that the electrical circuit was dipping down to low volts, and the UPS was kicking in. The shutdown never happened, but wow, I'm glad I had the UPS. I also got a cheap UPS for my modem due to power clicks for a while. My Internet connection kept having momentary drop-outs for several minutes, and the UPS keeps the modem running. I realized that my modem and router together costed more than $400, so got the UPS.

21:06 These are great features in a UPS - no doubt come with a price but pay fro themselves in the long term.

Nice detailed overview. But it looks like one of your Delta Pro blow warm air into another Delta

In my 20+ years of using UPS I had noting but disappointment from consumer grade standby devices. My go to for a long time was the Eaton Powerware line. My only complaint is the price. They have been discontinued for a bit now, but replacement batteries have continued to be available and fairly cheap. I will have to give Extreme a look for future purchases.

@uploadJ

Жыл бұрын

Well, from the late 1990's I had good luck with a consumer/office grade 500VA APC unit ... I was doing daily recording of voice material, so this solved power glitching issues which caused missed recordings!