36v UPS - https://amzn.to/2KFo4Wx
36v Batteries - https://jag35.com/products/two-wheel-balancing-car-battery-36v
Alternate 36v Batteries- https://s.click.aliexpress.com/e/_d9FLb88
DC power strip - https://jag35.com/collections/pcb-based-products/products/copy-of-7s-state-of-charge-meter-kit
28" Metal Enclosure - https://amzn.to/3cKyIaL
FAQ:
1) Where can learn more about batteries? http://j35.us/DIYlithiumBatteryBook
2) Where can I buy Lithium Batteries https://kit.co/jehu/lithium-battery-cell-sources
4) Where Can I buy Solar Panels? Flexible - http://j35.us/136wFlexSolarPanl
Glass - http://j35.us/100w-100-solar
DIY - http://j35.us/DIY-Solar-cells
5) Where can I buy a Battery Management System? https://kit.co/jehu/battery-management-system
6) What parts do you use on your Samba? https://kit.co/jehu/the-electric-samba-project-components
7) Why not use Supercapacitors?
A. Batteries work better at this time, caps are rare and expensive devices that are very good at doing things not needed for storage systems typically.
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16 thoughts on “Build a diy backup powerwall using a ups and scooter batteries”
  1. Avataaar/Circle Created with python_avatars Alan Day says:

    Why cannot I not find a place, in Florida, to convert my F150 into a F150 Lightning that does not cost more then an actual Ford F150 Lightning

  2. Avataaar/Circle Created with python_avatars jon mat says:

    Hi how can i purchase the hoverboard DC POWER STRIP PCB board on PCBWAY?

  3. Avataaar/Circle Created with python_avatars Wilfred Bucoy says:

    Happy Holidays Jehu. Thank you for all your videos. I have purchased scooter batteries with the intention to salvage the cells and put them into 12volt batteries (to replace the lead acid ones in my UPS). The UPS has 20 of these batteries in series to make 240v. I am using a BMS in each battery. Is there a limit to putting them in series? Thank you again.

  4. Avataaar/Circle Created with python_avatars Hรฉctor Berrรญos says:

    Hey Jehu, I'm working in something similar, same UPS. Did you find the LCD reading the correct SOC percentage while charging? Mine reads around 30% when the battery is almost 40v. It then continues changing the batteries until 42v then floating at 41v but the SOC is still reading 71% and going up very slowly. Thanks!

  5. Avataaar/Circle Created with python_avatars Cu Jo says:

    stunningly uninformative…

  6. Avataaar/Circle Created with python_avatars DryRoastedNutz says:

    I guess we now know why there are tons of e-scooters missing their batteries all.over towns now.

  7. Avataaar/Circle Created with python_avatars AffordYourNuance says:

    Chance of accidentally poking one of those and burning your whole damn house down in a firestorm?

  8. Avataaar/Circle Created with python_avatars myusernameislongerth says:

    Looks like the UPS was using Pb batteries, and your build is using Litium batteries. These batteries are chaged differently, does that not create a problem. Does the UPS you use have support for litium batteries as well, or did you do something to make this safe?

  9. Avataaar/Circle Created with python_avatars Mike Henriques says:

    How about a power wall that switches over automatically when the power goes out?

  10. Avataaar/Circle Created with python_avatars G Wiz, organized mixed content says:

    Yeah my backup battery for my computer wonโ€™t charge, or deliver power, with my solar system so thatโ€™s why Iโ€™m here. I want to be able to manually switch between grid power and solar

  11. Avataaar/Circle Created with python_avatars ZxRx7 says:

    Nice vid. One question though, why not use 3 x 12v car batteries?

  12. Avataaar/Circle Created with python_avatars james says:

    The batteires have a bms with a charging port. Did you leave that side disconnected? Thanks for the video.

  13. Avataaar/Circle Created with python_avatars Chomp says:

    I'm researching making a home power backup. Part of it would be an UPS that can handle 3000Wh for about 30 minutes until a gas-powered generator can be prepped, connected and started. Your design is interesting to me. However, I have a question: the UPS has an output of 1350W. Is that how much the electronics can handle? If so, what is the point of having 2.4KWh of batteries? Is that to have a longer run time, i.e. almost 2 hours at max 1350W load? Thanks for helping me understand the design.

  14. Avataaar/Circle Created with python_avatars ikempi says:

    I doubt you will read this, but heres an idea (I am thinking of doing it).
    UPS 5000W (yes a bit ovekill, but this is solely to cover peak needs at home) output over X amount of breakers to cover blackout coupled with lets say 20kW of potential power. This can be variable for personal needs, our average is about 10-12kW per day 24h, so could live 2 days blackout withotu being conservative. But this has a bonus side!

    But listen now, the idea is to make it possible to force the system to use battery over a schedule. If you feed in a schedule to use battery over a day and charge it up at night. We move more and more to the market where energy is expensive during the day (or at certain hours or periods), especially in winter time. 1kW cost up to 1.00 EUR for few hours a day, so you can imagine charging it at night at 0.1EUR per kW.
    How would you attack this idea? I am thinking of banking in on 10kW prototype and may be even think possibly sell and get maintenance contracts on top later if needed. If proto works, then find ways to make it cheaper and cut some profits while doing it.

    I can imagine this to work even on constant draws etc. For example fridges or facilities needing lighting 24/7.

    This all could save costs and pay for it self over few years. Plus you have UPS if total powerloss. Think about deep frozen jam, meat, icecream etc etc it could saved.
    Additionally it will take some pressure away from power plants and overall grid pressure when the demand is high.

  15. Avataaar/Circle Created with python_avatars Raj Gj says:

    Hi , i need a little help and suggestions… I have 8 60v (12-15A) lithium battery used from city coco bikes. And about 1 kw solar panels. My idea was to use the bateryes as they are ( with they bms inside) without opening them, just to conect them in parallel. Use a 2-3kw inverter and a solar controller. Will this project works ? Any suggestions plz ๐Ÿ˜ธ

  16. Avataaar/Circle Created with python_avatars aurf alien says:

    Wonderful vid and resource in general, one of my favorite resources on YouTube so thank you sir. I've a bunch of old 240V/split phase APC units lying around and now know what to do with em.

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