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Power & Energy
Forum Power banks for Home IT equipment - anyone used them?
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  • backup supply
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Related

Power banks for Home IT equipment - anyone used them?

shabaz
shabaz over 3 years ago

Several friends have been discussing the need to be prepared when/if there are power outages in the UK in Winter or Spring.

Our assumption is that the outage would not be longer than a day. Some of the battery backup systems cost thousands, which could be justified (say) over a 5-year life period, but it's unrealistic in the UK to want to be prepared with a backup source for 5 years for the home, given that any power outages won't be very frequent. Granted that backup systems could be used to obtain cheap(er) electricity at off-peak times, but it is hard to predict if the savings will be that significant enough to justify the big up-front expense commitment.

A generator is unattractive because of the noise, but we are open to it, but would definitely prefer a battery solution. Cooking food with an electricity source isn't too important; if there isn't natural gas connection in the kitchen, then camping gear could be used.

Then we noticed there are power banks. Some are in the $200 price range, many are $300-$500, and there are others circa $1000 and beyond.

There are lots of obscure power bank products such as the one below. It's a lot of energy to keep in a home, so whatever is used needs to be safe.

image (Image source: Amazon)

Backup lighting sources are cheap; there are even power tool ecosystems that use the same battery for task lights, so they could be used in a pinch. Not elegant, but it gets the job done at low cost.

However, we were not sure how to deal with IT equipment. Routers/DSL modems are straightforward because they operate from 12V or 5V and a backup supply is easily rigged up for that.

For laptops, it could be attractive to have a backup supply that offers USB Type C output, since many laptops (or lower power chromebooks) have a USB-C socket for power nowadays.

Any battery banks, or other backup scheme, that people can recommend? It would be nice to be able to charge (and run) laptops and power and charge anything that uses a USB connector. Perhaps a minimum of 100W power support would be needed, although really several hundred W would be preferred, so that a couple of laptops could be run, iPad, phones charged and so on. An additional 12V output would be a nice-to-have, to charge up or operate other devices. AC mains output is not essential. Hot-standby is not essential either, since a laptop will continue to run on its own battery while power connections are swapped. 

Any comments/ideas appreciated!

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Top Replies

  • rsjawale24
    rsjawale24 over 3 years ago +4
    I have fibre optic broadband at home. When it was first installed around 6 years back, I was surprised to see that the ONT had it's own 12V 6Ah battery supply for power outages. The power supply is quite…
  • three-phase
    three-phase over 3 years ago +4
    I use a 500wh portable station from Power Oak. I have had it a few years now and have not had any issues with it. I use it a lot on sites for powering test apparatus when there is no power close by. I…
  • vishwasn
    vishwasn over 3 years ago in reply to shabaz +4
    As a DIY solution to the WiFi router backup issue, I made this scalable battery bank using the 18650 cells and a BMS. Since required voltage is 12V. It is easy to have 3S balancer directly connected to…
  • beacon_dave
    0 beacon_dave over 3 years ago in reply to shabaz
    shabaz said:
    The past few times an outage occurred, the phone lines worked, since BT legally are not allowed more than a 6-minute outage as far as I understand (otherwise they have to report to the government) however I can't recall if that extended to DSL, it might just be for voice. I have a spare 4G/LTE modem so worst case I can get that going, it just requires a 5V DC source. Definitely a good idea to have a normal phone at home too, and not just cordless.

    I think that is all about to change after 2025 with the removal of the PSTN service. Originally Ofcom were suggesting that telecoms providers had to provide a backup power solution for the DSL router for VOIP during a power outage, however that appears to have been downplayed to vulnerable people only.

    I noticed that BT were suggesting that you now have a mobile for emergency use and that mobile providers suggest that you have a landline for emergency use... Anyone else see a problem here? 

    Your 4G/LTE modem won't be of much use when the mobile cells go out along with the power.

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  • beacon_dave
    0 beacon_dave over 3 years ago in reply to shabaz
    shabaz said:
    then a lead acid battery solution could be interesting. Cheap, and reliable even though it is large

    Ironically my lead acid battery backup + inverter solution failed during the storm. I think my solar trickle charger had possibly been gassing it.

    However, I've not had a great success with batteries in general. About 20 out of 25 of the UPS solutions I have worked with, have all failed within a very short space of time. Some didn't even make it through their warranty period.

    The trouble is they tend not to give any indication of a problem. They tend to pass the short self-test but then when you need them to deliver, they fail in use well before their rated capacity. 

    I was wondering if any of the standard LiFePO4 packs proved to be any more reliable. The other side of it is the battery management and charging modules.

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  • shabaz
    0 shabaz over 3 years ago in reply to beacon_dave

    Ah, just saw your comment. That looks about right, just the sort of product to DIY up a solution. The price is pretty reasonable too (£125), worth that for reliability/safety.

    I had a look on AliExpress earlier today, and ordered this (mainly because I saw a teardown on the Internet of another model by the same manufacturer, and it looked good, so I'm hoping this one might be too):

    image

    While I was at it, I also ordered the following unknown board, since it was cheap and worth a shot trying out too (both of these with a dummy load, not laptop!):

    image

    My laptop struggles to charge on 90W USB PD, but I could disable features/dim display, or use Chromebook/iPad etc, if things get difficult.

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  • shabaz
    0 shabaz over 3 years ago in reply to beacon_dave

    Why am I not surprised : ) Ofcom are useless : ) A bit like Ofwat, more in it to serve the industry rather than the consumers. If only they could get rid of the customers, all their problems would be solved : ) 

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  • phoenixcomm
    0 phoenixcomm over 3 years ago in reply to shabaz

    shabaz do yourself a favor and go for marine deep discharge batteries. If you go with volt units wire them in SERIES for 48vdc. Much more efficient than 12vdc. if you trying to get to 120vac but then again you may want 230vac (if you live across the pond. A lot of electronics that I used to use had a 48vdc input. 

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  • shabaz
    0 shabaz over 3 years ago in reply to phoenixcomm

    I see.. that's good to know. I'll research what I can find here. These look to be a reasonable price, and available (currently at least! there may be a rush to purchase batteries toward winter perhaps): https://www.yuasa.co.uk/rec50-12.html

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  • shabaz
    0 shabaz over 3 years ago

    I don't want to connect a laptop without confirming it works first, so I had a look and there were lots of Type-C USB PD power sink testers on Aliexpress, but in the end I went with this: https://www.mikroe.com/usb-c-sink-click

    image(image source: mikroe.com)

    It's cheap, simple, and I can connect it to (say) a Raspberry Pi or Pico, and use that to configure up a voltage and max current, and then connect a test load and 'scope to it.

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  • vishwasn
    0 vishwasn over 3 years ago in reply to shabaz

    Lol. Yeah, fixed the link. Here it is.

    www.instructables.com/.../

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  • beacon_dave
    0 beacon_dave over 3 years ago in reply to shabaz

    Waveshare do something similar using 18650 cells but with USB-C PD output and the option for solar charging.

    https://www.waveshare.com/wiki/Solar_Power_Manager_(C)  

    At the time I was looking for a power bank that had easy-to-replace cells so as you could pick known-quality cells and in addition for a power bank that could act as a mini UPS.

    They do some designed as Pi Hats that attach to the GPIO header as a mini-UPS.

    Unfortunately no 12v out for the likes of a router.

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  • shabaz
    0 shabaz over 3 years ago

    Another recent (today) discussion on something similar in some ways, but not quite the same:

    https://hackaday.com/2022/11/02/low-voltage-dc-network-build-incited-by-solar-panels/

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