DIY – 12V Mini UPS

UPDATE – It’s important for this project to use a better 2S BMS board with overcharge recovery voltage feature.

A big Thank You to my patreons, especially my favorite – Kyle Shankin 🙂

My Patreon campaign: https://www.patreon.com/sorindiy
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If you are a nice lad and want to donate to me on Paypal, here you go: melcumlk@gmail.com

Schematic: https://imgur.com/a/35cMeDv

Components list:
2S BMS board: https://s.click.aliexpress.com/e/_AKYNqy
plastic box: https://s.click.aliexpress.com/e/_ABLymY
step up converter: https://s.click.aliexpress.com/e/_AeTP1i
charging plug connector: https://s.click.aliexpress.com/e/_A9UT4g
small rocker switch: https://s.click.aliexpress.com/e/_ALF78u
5.5mm connector lead: https://s.click.aliexpress.com/e/_9JLlc0
32V small digital voltmeter: https://s.click.aliexpress.com/e/_AMte1W
8.4V 2A charger: https://s.click.aliexpress.com/e/_9QwBl2

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50 Comments

  1. Bill Trapezanlidis on December 22, 2020 at 10:21 pm

    Great Job ! How we can activate a device (not the router) only in the power failure ? So the device will receive power from the battery only if electricity cuts off. By the way it will be great to make a video for emergency led lights when power failure! Thank you and continue the great job !

  2. Guhan Kumar.T on December 22, 2020 at 10:22 pm

    Fix the diode in the input ,so the current won’t follow to the charger

  3. Lloydie Desu on December 22, 2020 at 10:22 pm

    update on my build i just use it for 2 hours? why is that??

  4. Scotty 123 on December 22, 2020 at 10:23 pm

    Sorin what’s the purpose of using an voltmeter?

  5. Scotty 123 on December 22, 2020 at 10:23 pm

    Hi sorin I order 2s bms 20 amp before I get the product I would like to ask that can it use 6 18650 battery because I want bigger capacity please help me out

  6. chandrasekhar guntupalli on December 22, 2020 at 10:24 pm

    Hii , my d-link wifi router was not turning on , i used xl6009 module , router light was blinking and not turning on .what should i change..help me

  7. Tom111060 on December 22, 2020 at 10:24 pm

    … whatabout insalling a diode to prevent charger of drawing energy when offgrid? … would make project 110% …

  8. rodstartube on December 22, 2020 at 10:24 pm

    This is just a battery charger, as batteries are always being drained, either connected to wall adapter or not. The concept of UPS is that batteries will drain only when AC wall adapter doesn’t provide energy.

  9. din dro on December 22, 2020 at 10:28 pm

    Can i use 3s bms with 3 batteries in series with the default 12v 2amp adapter which come with router?

  10. Umer Wajihuddin Syed on December 22, 2020 at 10:29 pm

    Please make a similar 12v ups using a 3s configuration

  11. Ryan Salavaria on December 22, 2020 at 10:31 pm

    Sir can i buy that ups you made..👏👏🥰🥰

  12. Makunan Bastion on December 22, 2020 at 10:32 pm

    Hi Sorin, very good vídeo and very useful UPS. What is better to use, a step Up or a step down Converter?

  13. Josh Lopez on December 22, 2020 at 10:32 pm

    It is charging the batteries in the setup? please answer me. Thanks

  14. Anandhu Purushothaman on December 22, 2020 at 10:34 pm

    Would it be okay to connect 2 step up converters to the same 2S BMS protection board so that I can configure one with 12v output and the 2nd one with 9v output. I need to power a Wifi Router (9v) and an Optical Network Unit (12v). Also can I add 2 batteries parrallelly like you mention at 12:16?

  15. Rajesh Ruchandani on December 22, 2020 at 10:36 pm

    Very nicely presented. Thank you for explaining so well. 😊👍

  16. Muhammad Elias Melad on December 22, 2020 at 10:38 pm

    Why did you convert them in series first and then parralel… any advantage? curious. i would connect all 6 in parallel

  17. Long isGone on December 22, 2020 at 10:39 pm

    I like this build. There are many applications you can use this for, like emergency lighting when the power goes out

  18. Tech Channel on December 22, 2020 at 10:39 pm

    Don’t buy energy intelligence ups, it don’t work with jio fiber, router keeps restarting, when I requested for refund the agent said he is sending a adaptor which I never received and then he said we can’t refund because we have sent the adaptor and we want it back. Worst company. Worst products, worst service, better buy any other ups from Amazon atleast you can get refund easily. I have wasted Rs 70 for return shipping as well. 🙏

  19. 植栗イムティアーズ on December 22, 2020 at 10:44 pm

    Thanks for nice video
    I want to see the video for the other BOX which is you are showing in this(upper) Video.
    would you please upload or give me the link for the Video.
    Thanks

  20. Tama Mma on December 22, 2020 at 10:44 pm

    Is possible to make a 12v 3.5A Output UPS? My netgear router is 12v 3.5A powered

  21. James E. Tramel on December 22, 2020 at 10:45 pm

    Great Video, I also have a couple of VOIP modems that are next to my router could this be altered to put out 5v also, I’m sure it can, I have a UPC that I could keep with my Computer & TV if I had this for the modems, great idea, these batteries are easy to find & not expensive. Bravo!

  22. Jinyu Liu on December 22, 2020 at 10:45 pm

    Hi Sorin, great video! I would like to ask at 11:47, your adaptor is powered by the battery (in the case of power voltage). Do you think the adaptor can handle this ‘reversed power supply’?

  23. Pablo Pazos on December 22, 2020 at 10:45 pm

    where do you get an 8.4v charger?

  24. fitzdevlin on December 22, 2020 at 10:49 pm

    very impressive; nice and concise with just the right amount of levity. thanks for inspiring me to figure out some way of creating a solar connection to the new ONT that’s on it’s way—will be mounted inside. i’ve been using a RavPower array and battery pack when out camping, and i’d love to find a way to protect us from days without electricity in the DC area (notorious) in the event of big snowfall. Verizon will be running new fiber along side our old copper telephone wiring, and so i’m even wondering if there is a way to somehow use/reconnect the copper lines again during such an event…anyone have any ideas/links/etc?

  25. Akshay Kumar on December 22, 2020 at 10:51 pm

    Truthfully the first video i liked, subscribed and shared

  26. Brandon S. on December 22, 2020 at 10:51 pm

    2:47 why wouldn’t I want to use the 1803mAh and the 1795mAh cells? Does it even matter?

  27. josephwheeler1 on December 22, 2020 at 10:51 pm

    I love videos that give good instruction. That’s the reason I’ve subscribed to you keep up the good work.

  28. Debasish Basak on December 22, 2020 at 10:51 pm

    This is the first ever channel that I have intentionally subscribed. Liked it and much helpful.

  29. Marius Schäfer on December 22, 2020 at 10:52 pm

    5:55 Not a Dremel!

  30. suddakkan on December 22, 2020 at 10:53 pm

    your face match for a electrical engineer

  31. Abhay Dandekar on December 22, 2020 at 10:54 pm

    I saw a small flaw, its even powering the input ends when on battery … I think putting a zener diode will help fix that. Two diodes, one for positive and one for negative will work ? or a single diode on positive IN connection will work ?? Let me know .. 🙂

  32. Pitipu Corrado on December 22, 2020 at 10:56 pm

    We built a couple of these for out competition bots, they use a 12v access point and it’s a pain to have to wait for them to boot up

  33. Huzza TV - DreamBook on December 22, 2020 at 10:56 pm

    Need is mother of invention 👍👍

  34. Kannan Amirthalingam on December 22, 2020 at 10:57 pm

    Really your expectations is good thank you sir 🙏

  35. Agung Priambodo on December 22, 2020 at 10:59 pm

    the cat😺

  36. SAMIYAN MOJUMDAR on December 22, 2020 at 11:00 pm

    Veri helpful video.. Thank You so much bro

  37. theraque1 on December 22, 2020 at 11:01 pm

    subbed because of this vid. thanks bud! I’m looking forward to making this.

  38. Fattest Pigeon on December 22, 2020 at 11:04 pm

    I like your clear and concise explanations of what you’re doing in each step. But wouldn’t it be better to limit the charge to a lower maximum voltage (e.g. 3.9 or 4.0 V per cell)? That should significantly improve longevity and safety at the cost of a small amount of capacity.

  39. POWER ELECTRONICS By Prof. J B Jawale on December 22, 2020 at 11:05 pm

    Nice explanation
    #Profjitendrajawaleonlinelearningsolutions #onlineups # UPS

  40. AudioDogFlorin on December 22, 2020 at 11:08 pm

    Tocmai ce am trecut si eu la fibra optica si am si o gramada de celule si bms-uri, deci am ce face in weeknd! Multam de idee si cum ar spune americanu’ : keep up the good work !

  41. Deepak on December 22, 2020 at 11:09 pm

    did you make a new UPS yet? as you mentioned in comments

    waiting for you new design to make one myself with 4s for an output of 19v 2a for my router.

  42. Dan Baker on December 22, 2020 at 11:09 pm

    soldering lithium battery’s is a really really bad idea. it will ruin the battery life span or worse blow up in your face. Ive come close when they go it can happen faster than people can react

  43. Scotty 123 on December 22, 2020 at 11:11 pm

    Sorin can it charge with 9v 1amp charger? it’s hard to find 8.4v charger in my country

  44. الله أكبر on December 22, 2020 at 11:11 pm

    Dramatically fantastic. Thanks

  45. Liton Ullah on December 22, 2020 at 11:12 pm

    What type of fuses did you use?

  46. Gilad Itzhak on December 22, 2020 at 11:12 pm

    Hi Sorin, I mounted one to the modem and now I need for the router. The thing is, the router requires 12v & 3amp. How do I run 3amp? Thanks.

  47. Anderson Pyaban on December 22, 2020 at 11:13 pm

    GUD STUFF

  48. alsy2011 on December 22, 2020 at 11:14 pm

    can i use a buck converter (regulate to 8.4v dc) so i can use my 12v dc power supply? thanks

  49. Reajoan Mashfik on December 22, 2020 at 11:16 pm

    what type of onu u are using

  50. shawn pugon on December 22, 2020 at 11:20 pm

    i would like to ask about your dc to dc buck converter how it keeps 12v output even the 18650 battery are near to drain thanks

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