https://kit.com/jehu/7s-state-of-charge-meter
Updated resistor values + https://scontent-sjc3-1.xx.fbcdn.net/v/t1.0-9/62130503_10158483948636978_9019448621728268288_o.jpg?_nc_cat=111&_nc_oc=AQmbtYjuzG1UaBrHNhSWHEftmB7qM3Qj_MDoPs99xX43xd78WDVk6lzXdP1nX93Nuy1woy2iAdyN112DheQltnu8&_nc_ht=scontent-sjc3-1.xx&oh=a7bdae78a2bee24671f5d58be938a33f&oe=5E502741
FAQ:
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2) Where can I buy Lithium Batteries https://j35.us/Recommended_Lithium_sellers
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6) What parts do you use on your Samba? https://j35.us/eSambaProj
7) What is the best fuse wire? I only use 1/8w resistor legs http://j35.us/ResistorLegs
8) 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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14 thoughts on “Populating 7s state of charge meter pcb”
  1. Avataaar/Circle Created with python_avatars Mike Hawkins says:

    How the hell does an open fuse cause 5 & 6 to function in unison? Must have been a short circuit between 5 & 6, shorting cell 5 and blowing the fuse.

  2. Avataaar/Circle Created with python_avatars Big Teddy Bear says:

    What happened to the SOC? On your website those are pictured but cannot be ordered.

  3. Avataaar/Circle Created with python_avatars MOKSH PATEL says:

    Hello sir can you make smart board like a add button to show level and 5s to turn off led and also notified by battery is lower then you set like 3.7 or 3.8.

  4. Avataaar/Circle Created with python_avatars Abe Coulter says:

    where did you get that battery monitor from?????? the small hand held one

  5. Avataaar/Circle Created with python_avatars Zulqarnain Ul Hassan says:

    Hey, can anyone send me a link to the gerber file?

  6. Avataaar/Circle Created with python_avatars AIONizando CR says:

    Can you upload a video explaining all components you already have designed for the full Power Wall? I would like to order everything but I'm not really sure how every component connects to each other. That rainbow cable confuses me

  7. Avataaar/Circle Created with python_avatars Steve Tyukodi says:

    Jehu, The kit you sent me contained 8 resistors per pack. There were 2 packs of 3K resistors, 1 pack of 7.5K resistors and 1 pack of 13K resistors and 1 pack of 1.8K resistors. I can place the 3K above and the 7.5K below the LEDs, but the rest don't add up to the drawing you show in the vid, help me out here bud.

  8. Avataaar/Circle Created with python_avatars Kata Seiko says:

    You snipped off I don't know how many legs.. Why not use them for bridging the pads? Also, for v3.2 maybe Sven can add THT holes for 2.5mm posts so you can use the jumpers that you know from a PC. That makes it less awkward to turn that off and on later on.

  9. Avataaar/Circle Created with python_avatars Melca K. says:

    Hi Jehu, I am in China teaching and looking around on the various sites and I came across the 26650 some at 3.2v and others at 3.7 v. Now the 3.2v is supposed to be lifepo4 and the 3.7 is limag or something like that. Can you let me know how these would work in a powerwall if lfp is suppoed to have so much better life etc why not use that instead of the 186650. Looking forward to your reply. Oh one other thing, there are a lot of other manufacturers that are making a ton of batteries and I think you might be able to do better than that revolt for price. you should check out more of the batts available and I think you will be able to get something half the price. they are hurting to get biz if you know what I mean right now. cheers.

  10. Avataaar/Circle Created with python_avatars DROID TEAM says:

    friend you could gift me with a led bar of this, pos I can not buy,

  11. Avataaar/Circle Created with python_avatars Tyler Watt says:

    should n't overcharge-led be red

  12. Avataaar/Circle Created with python_avatars MikeJ F says:

    What wattage is your soldering tool?

  13. Avataaar/Circle Created with python_avatars John Prusa says:

    How do you decide on which board in assembled stack is the bad cell and how do you replace it

  14. Avataaar/Circle Created with python_avatars Allan L Haensgen says:

    When will you have more boards?

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