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Author Topic: Battery Backup and UPS Devices  (Read 240 times)

jelv

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Battery Backup and UPS Devices
« on: January 11, 2022, 05:37:50 PM »

[Moderator note: This post and those that follow have been split-off from Weaver's "Placement of NTU and related FTTP gubbins" topic.]

I have a APC Back-UPS CS 350 that just has my modem, NAS box and cordless phone base station. It runs for way longer than 15-30 minutes.

I recently bought a replacement battery for it - 18.99 - I don't consider that expensive.
« Last Edit: January 12, 2022, 05:55:14 PM by burakkucat »
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Alex Atkin UK

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Re: Battery Backup and UPS Devices
« Reply #1 on: January 11, 2022, 06:43:42 PM »

I have a APC Back-UPS CS 350 that just has my modem, NAS box and cordless phone base station. It runs for way longer than 15-30 minutes.

I recently bought a replacement battery for it - 18.99 - I don't consider that expensive.

That's strange as the official runtime graph suggests it should only do around 30 minutes on a 50W load.

Also look at the rating, its a 116A/h battery so if it was outputting only 12V it could run for most of a day at 50W.

Its also highly recommended to use a true sine wave unit on modern PSUs as modified sine waves can interfere with the power factor correction.
« Last Edit: January 11, 2022, 06:46:37 PM by Alex Atkin UK »
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craigski

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Re: Battery Backup and UPS Devices
« Reply #2 on: January 12, 2022, 09:48:48 AM »

I was curious when you said 116Ah, and price was quoted as 18.99 (a lot of battery for that price!).

I just checked spec in detail ,the UPS states 116 power-volt-hours, so assume Wh, the battery says 7Ah.

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Chrysalis

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Re: Battery Backup and UPS Devices
« Reply #3 on: January 12, 2022, 11:57:03 AM »

I have never had a UPS unit I purchased run even close to advertised run time, maybe I am unlucky on defective/aged batteries I dont know.

Personally I think mobile is enough for emergencies in populated areas, if a populated area does not have indoor coverage then there should be a legal prod towards mobile providers to get that sorted.  That leaves areas like properties in the middle of nowhere, which I guess BBU would be a need.  I have a cheap UPS in my living room, it advertises 45 minutes run time for 10w load, which probably means in reality 10-15 minutes.

EE are finally doing some mast work after lots of prodding as their 5G coverage is outdoor only for me where I live under 1 mile from the city centre.  Its an issue unless the phone is rooted to force it to 4G as it keeps jumping from 4G to 5G and back indoors causes loss of connectivity.
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Alex Atkin UK

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Re: Battery Backup and UPS Devices
« Reply #4 on: January 13, 2022, 12:03:39 AM »

I was curious when you said 116Ah, and price was quoted as 18.99 (a lot of battery for that price!).

I just checked spec in detail ,the UPS states 116 power-volt-hours, so assume Wh, the battery says 7Ah.

Darn spec sheets, I obviously missed that.  It did puzzle me that the difference seemed a lot bigger than it should be.

Personally I think mobile is enough for emergencies in populated areas

My mum wouldn't even know how to connect to WiFi, never mind how to turn on tethering on her phone, nor the cost of doing so.  So everything has to be automated and work should I not be around to fix it.  Granted not an issue during the pandemic as I never leave the house.

But as the router is run off a normal UPS due to having a 12v 5A PSU, the run time would be rather short anyway.  Thus why I'd rather like a beefier 12v UPS, although then there's the darn switch that HAS to run off a normal UPS so its not an easy problem to solve with my setup.
« Last Edit: January 13, 2022, 12:08:31 AM by Alex Atkin UK »
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craigski

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Re: Battery Backup and UPS Devices
« Reply #5 on: January 13, 2022, 01:13:17 PM »

Confusing, this UPS thread is now being discussed in two places, I will continue here  :)

What about a Eaton 3S mini, will do 12v and 19v, replaces the PSU for the device:

https://www.eaton.com/content/dam/eaton/products/backup-power-ups-surge-it-power-distribution/backup-power-ups/eaton-3s-mini-emea/eaton-pqed-dpq-3s-mini-datasheet-low-en-us.pdf.pdf
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g3uiss

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Re: Battery Backup and UPS Devices
« Reply #6 on: January 13, 2022, 02:50:42 PM »

That looks a great unit. I have commissioned Eaton AC UPS's on many occasions and found the devices great.

Do you know cost ? :-\

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craigski

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Re: Battery Backup and UPS Devices
« Reply #7 on: January 13, 2022, 03:23:03 PM »

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Weaver

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Re: Battery Backup and UPS Devices
« Reply #8 on: January 13, 2022, 06:32:48 PM »

Very nice, could be a rather larger battery than my powerinspired unit?
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Alex Atkin UK

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Re: Battery Backup and UPS Devices
« Reply #9 on: January 14, 2022, 01:21:58 AM »

For reference, the ones I were talking about before https://amzn.to/3Gr885J and I also stumbled onto this which is quite interesting.

Honestly the huge problem for me is disposing of used batteries, the nearest recycling center is a bus journey away and is not designed for foot traffic at all.
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