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

Power banks for Home IT equipment - anyone used them?

shabaz
shabaz over 2 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 2 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 2 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 2 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…
Parents
  • rsjawale24
    0 rsjawale24 over 2 years ago

    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 bulky because of the battery but the solid state switching is much faster than the inverters at my home. It switches to battery power immediately when the mains is OFF.
    Maybe a similar kind of UPS is available specially for network/IT instruments.  Also, since most IT instruments run on 12VDC it shouldn't be difficult to DIY a 12V DC supply powered using Li/ Lead acid battery.

    A quick amazon search showed these results

    image

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  • shabaz
    0 shabaz over 2 years ago in reply to rsjawale24

    That's very neat that the broadband modem came with in-built backup : ) 

    Here they usually don't but for that and router/wifi it is straightforward to back that up with a battery, and a BJT + relay + capacitor should result in a very reliable hot-standby solution easily. It doesn't even need to be rechargeable, since the batteries could be removed and charged up, and then the charge topped up if required every few months (assuming outages are very infrequent, which is the case here).

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  • vishwasn
    0 vishwasn over 2 years ago in reply to shabaz

    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 the 12V supply.

    Link: www.instructables.com/.../

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  • vishwasn
    0 vishwasn over 2 years ago in reply to shabaz

    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 the 12V supply.

    Link: www.instructables.com/.../

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  • shabaz
    0 shabaz over 2 years ago in reply to vishwasn

    Hi vishwasn thanks for the info! 

    Unfortunately the link isn't working for me, could you re-type it? or let me know the search term to find it on Instructables.

    I think you're right, 18650 cells will be sufficient to power the router for many hours, it's a great option. 

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  • vishwasn
    0 vishwasn over 2 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 2 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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