Calculating UPS Requirement

POST DELETED

Edited by Tacitus (Mon 29-Nov-21 12:17:08)

Hehe. It was a fair question @Tacitus and I had an answer for you but you wiped out your OP before I could reply.

Suggest that you have a read through the latter part of this thread on here too, where this line if discussion has been fleshed out some more.

There is something to be said for using mini DC only based backup solutions (a power bank on steroids) rather than a full blown traditional UPS especially for routers, access points and VoIP DECT bases.

In reply to a post by Pheasant:

Hehe. It was a fair question @Tacitus and I had an answer for you but you wiped out your OP before I could reply.

Suggest that you have a read through the latter part of this thread on here too, where this line if discussion has been fleshed out some more.

Thanks @Pheasant. I found the thread you refer me to which did give me some idea of tyoical values, hence my deletion of my post.

Having read it I'm surprised there aren't more DC based backup solutions as most of the traditional solutions on offer are desgined to allow PCs/servers to shut down gracefully and that's about it. AFAIK, most comms stuff runs on 5V or 12V with the occasional 24V - I think there's some PoE kit that uses 24V. The advent of VoIP suggests a gap in the UPS market, as you say particularly for routers, WiFi access points and DECT bases. The lack of a decent mobile signal round here means I'm forced to use WiFi calling, so something that backed up all of the foregoing would be ideal.

Whilst power is mostly restored in less than an hour, outages of 4 hours or more are not unknown, something which would need a sizeable power bank.

Edited by Tacitus (Thu 02-Dec-21 15:04:35)

Old school telco gear was all 48 vDC powered, because exchanges had wacking massive 48 vDC backup supply. Still to this day a lot of telco equipment comes powered this way.

PoE is a good proxy as you can efficiently centrally UPS power a lot of kit, such as wired IP handsets, WiFi and DECT access points, IP camera, even small computers (if your switch or injector is of a high enough PoE class output). In fact it’s quite a bit more efficient doing it this way than having scattered UPS units, though I suspect most homes in the UK won’t have either the cabling or need really…

For a domestic situation with a fairly standard ISP supplied router/WiFi base unit or the equivalent maybe a separate DECT cordless base then yeah the little mini DC units like the suggested Eaton 3SM36B 3S Mini UPS are a good shout. Basically if it’s got a barrel type DC input it’s a sensible option to explore imho.

I know you have deleted the post but it reminded me of a couple of youtube videos I had seen in the past where folks made their own homebrew DC UPS with good results. They didn't have monitoring but were functional.

Go to youtube and search for "DC UPS" then scroll down until you find the videos by "Sorin - DIY Electrical Nerd", "Mikes Inventions" and "Open Green Energy".

Yep - If we need whopping masses of backup 8 , 12 hours or longer and go the 'agricultural' route (no offence to all the great farmers out there, you guys and girls are amazing) - then all you need is a decent size leisure /deep cycle battery and a battery charger with sufficient output to run your devices and keep the battery topped off and a regulated 12V output (with a fuse!)

In reply to a post by DanielCoffey67:

Go to youtube and search for "DC UPS" then scroll down until you find the videos by "Sorin - DIY Electrical Nerd", "Mikes Inventions" and "Open Green Energy".

Some interesting links thanks.

A bit beyond my DIT capabilities though. The last time I tried anything of that sort was when as schoolboys me and a mate built a single valve radio. Yes it was that long ago, just before Heathkits came in for build it yourself HiFi.