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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 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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  • 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…
  • beacon_dave
    0 beacon_dave over 2 years ago

    "...Our assumption is that the outage would not be longer than a day..."

    You might want to rethink that bit. Slight smile

    Ever since 'Storm Desmond' took the local substation out (without power for 4 days), I've been interested in some sort of off-grid solution. More recent storms have affected other areas in a similar manner. The emergency response wasn't and hasn't been that great and you are on your own as pretty much everything instantly shuts down around you due to modern overreliance on grid power. 

    The problem with the power banks is it's hard to tell how serviceable/reliable they are. I would prefer to have something that used standard readily available batteries and that charged and monitored them in a safe manner. Ideally with a provision for solar hookup so that you can make the most of the few daylight hours when available. 

    My other thoughts were to have a small LPG generator as some of these are very quiet, and bottled gas stores quite well. Enough to keep the fridge/freezer and boiler pump powered and to charge a few batteries. LPG can be used with camping stoves/heaters as well.

    It's going to get worse here soon when they switch the analogue PSTN service off in favour of VOIP as for many that will mean no phones as well as no power. From the last outage, it doesn't appear that the mobile phone infrastructure has the same backup power that the telephone exchanges currently have. 

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  • phoenixcomm
    0 phoenixcomm over 2 years ago

    Shabaz imagepersonly a 100w anything is way too small. A solution for you would be to roll your own. and then you will need a lot of batteries. I used to own, a large HP UPS I think its output was ~ 2000watts, and it had two rackmount units, one for the electronics, and the other for the batteries. together the unit was about 10" tall and used to sit at the bottom of my rack. this beast using keep my Cisco 7000 router. The two thick cables ran to two separate Adtram ISDN DSUs. The pic was taken when I started building out, when I was finished I think I had 8 DSU in total. 3 of them were private, to get more bandwidth we had a total of 4 DSUs bonded together at my upstream ISP. The USPs held up a lot of stuff. Including JAVA Stack Server (middle pic) and my Nortel phone switch. I remember we had a power outage that lasted over 6hrs and I was out when it happened I was out at a meeting. when I can back the light where out but there was a racket coming from my garage. It was my UPS I shut it down as my servers were on the other side of my house.  I made dinner on the gas stove and about 2 hrs later the power came back on.  After I reset all the computers I walk back to the garage and turned my UPS back on. ( prior to 2005)

    imageimage

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  • shabaz
    0 shabaz over 2 years ago in reply to three-phase

    Hi Donald,

    Thanks for the info! I'll check the latest electricity bill to find that code.

    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 had a look, it seems that Power Oak have a brand called Bluetti that seems consumer-oriented. I'm still looking for something with higher power delivery over USB-C, since the Power Oak and Bluetti devices offer 45W or so, and that's good for some laptops, but 90W or more would be preferable (mine cannot charge even with 90W, it needs higher, but I have a Chromebook and other devices that would be fine with 45W). Anyway, Power Oak and Bluetti will be top of my list for now in terms of reliability and safety, since you've not heard of any issues with that manufacturer devices.

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

    Hi Dave,

    Wow - yes, a 4-day outage was not something that we considered! : ) I hope the electricity firm compensated financially, but I guess it's minimal. I struggled to get any compensation even though I proved the voltage was out of limits after an outage, and it destroyed some LED lights.

     By the way, there are currently some scam firms online offering low-cost generators (like £100-£150 cheaper than expected). A friend got burned by one called "gar store . co. uk", Definitely worth checking Trustpilot etc before purchasing. 

    If I could find some ready-made USB-C PD boards that would accept 12 or 24V and output 90W or so, then a lead acid battery solution could be interesting. Cheap, and reliable even though it is large. It could be stored outside, in a garden storage box, removing some of the risk of storing so much energy indoors.

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

    Hi Cris,

    This is great info, and nice to see the photos of your gear! The 7000 series I didn't get to use, but the 7200 were super-feature-rich devices, I think they may have been similar. 

    Interesting that the entire 2kW backup solution was just 10" tall. That's more compact than I expected, which does enable it to be very feasible for home use.

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  • kmikemoo
    0 kmikemoo over 2 years ago

    shabaz  I used to have an APC UPS system on my home network.  Note the past tense.  We had a multi day outage a number of years back and that is when I learned that my cable and internet service provider didn't have backup for their distribution system.  While my home network functioned, there was no connectivity to the outside world.  I share this story because what I thought was a super cool system didn't turn out to be as cool as I thought.

    If I was going to do it again, I would opt for no AC output, just 12V (barrel jack and cigarette lighter output) and 5V USB.  The nice thing about the UPS was fast switching.  The Not Nice thing was the extra DC / AC / DC conversion.  Not efficient.  I'd get the car power supply and make it do double duty, car and home emergency power source.

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  • beacon_dave
    0 beacon_dave over 2 years ago in reply to shabaz
    shabaz said:
    If I could find some ready-made USB-C PD boards that would accept 12 or 24V and output 90W or so

    This will do 11-17V and output 60W+18W:

    https://www.hawkwoods.co.uk/Cine/P/I-PWC

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

    Hi Mike,

    Very useful info! I've had a discussion with some others here and the car battery idea is attractive, and using the AC inverter only where absolutely required.

    I've searched around and found a couple of USB 100W PD modules that accept ~12V input. I've ordered one from Aliexpress to test. I'll subject it to different input voltages and try to load it somehow (need to find a way to interface USB-C to an electronic load). I'll report back how it goes. If it works, then this solves the big part of this IT backup supply problem!

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

    I just took a picture of it. It's not amazing but works well enough to keep the WiFi router going for a few hours if needed. That's the little solar panel behind it - it was designed to plug into the cigarette lighter plug of a car to keep the battery topped up.

    True that the old tech seems to be more reliable in some ways.

    image

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