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  1. Church1182

    Any interest for custom PCB for 4 bay USB charger?

    I'm with Korishan on using a different chip. I was looking into this myself last week, more to just see what it would take than seriously designing one, and there are a number of other charge controller chips out there with good features for very reasonable costs. Considering you can get TP4056...
  2. Church1182

    Lithium Iron Phosphate

    Wow! That could be a deal depending on what life is left and what they want for them. Spec sheet indicates to me an internal BMS as it says you cannot put them in series (last line under Max Operating Conditions) and it has high and low voltage cutoffs built in.So if you need a 24V solution that...
  3. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    I agree with Geek, I wouldn't call them a fake cell. It is an 18650 battery being marketed and sold as a LiitoKala battery, not Samsung. I just found it interesting that it said Samsung under the label. My guess is that they are one of a few posabilities. 1) They are a very cheap chinese cell...
  4. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    Ran across a decent looking cell on AliExpress that was the same price as what I picked up from Tom on eBay. Being sold as a LiitoKala cell. It says Samsung under the wrapper. I need 70 more to commission my Powerwall so I gambled on 80 cells. They arrived yesterday and the first 8 went right...
  5. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    Welp, on to Plan B for at least some of the components. According to the tracking number my ADUM1250 chip order was canceled by the shipper. They claim the carrier lost it. So not sure how that will play out, but I found 10 on eBay for a little more than what they were on AliExpress, so I'll...
  6. Church1182

    Harvested cells analysis.

    I would have to agree with Dallski. You've come this far, might as well see it through. Love the spreadsheets. Edit: Although if you are using cells that still have that much life, I would lean towards remaining life over actual capacity. Barely.
  7. Church1182

    Voltage difference of cells while building packs?

    I'm wondering the same thing and have not come up with a good answer yet. My solution though, I think, is that when I get to building mine I may use a resistor to connect the next cell to the group until the pack balances if it's off by more than 0.1V. Basically the lowest cell is going to be...
  8. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    I have not tried them yet, but I am adding it to my sources list. I have used Mouser, Digi-Key, and Newark/Farnell for various components over the years. They all seem pretty competitive price wise. I know I can use other sources and get parts A LOT cheaper, but then again they are cheaper...
  9. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    Status Update: Boards and most components have been ordered. Currently sitting at roughly $8 US per board for 15 units. According to the emails, I should be seeing boards and some parts by the end of the week. I went with a mix of Mouser and Aliexpress for the components. I have not ordered...
  10. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    So I decided on a BMS and am covering the details of that on this thread. In researching the various options I was simply not comfortable with the low end options, and it seemed like other than the Chinese protection boards you didn't really have a lot of options from there to the Batrium level...
  11. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    That lovely graphing is where Stuart, Colin, and Adam Welch have gotten the project. They have some videos on YouTube about using it. The code is developed for the ESP8266, but word is it can be done on several Arduino boards. Probably wouldn't take much to go to Raspberry Pi either.
  12. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    You got it. That was one of the main reasons for making this a separate thread from my build. I dug through a lot to get the information thus far and still have not come across a clean, concise set information on a build. Hopefully I can provide that. As I understand it the system is slave...
  13. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    I did check pcbway and I think they are the same company as allpcb. Their websites layout and function are almost identical. The colors are different, but that was it. I paid$23 US shipped for 15 pieces, $1.53/board seemed quite reasonable. :D
  14. Church1182

    diyBMS - Stuart Pittaway/Collin Hickey Ver. 3.0

    I've been digging around and researching various BMS systems and have come to the conclusion that "BMS" is a catch-all term. Anyway, I am moving forward with the design started by Stuart and forked on Github by Colin. I considered putting this in my build thread, but thought it might better go...
  15. Church1182

    Powerwall silly question

    Jofiferreira, Welcome! That is up to the individual user. If you were to account for the time it takes you to do all this, then apply a monetary value to your time the answer is no. I do not see how it could be worth it. Most of us though aren't doing it just to try and save money, we enjoy...
  16. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    I am! Primarily due to your work with it and review of it. I had been looking into them and there seemed to be quite the range of options, at least price wise. After reading what you have done with it, and at that price point, it seemed like a great value. As for the rest of it, yes. I agree...
  17. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    As I mentioned in the first post, I have an APC UPS that the batteries hit end of life in. Rather than trying to replace those with more SLA packs, I had two thoughts. One was to dismantle the UPS and salvage the parts to integrate into a Powerwall, the other was to build a smaller pack that...
  18. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    That was my take as well. Kind of a "salt to taste before watching" approach.
  19. Church1182

    Signs you may have a lithium addiction problem

    When you are calling up a potential new supplier and start trying to reason with them that RCRA does not apply because you want to buy "used" batteries, not "waste" batteries.
  20. Church1182

    Mockingbird Hill Farm(MHF) Powerwall 1

    This is also posted on another forum site, but it feels appropriate to document it here in different detail. This seemed like a good way to kick it off though... The Background A few years ago I moved my family back to the area where my wife and I grew up. Specifically the farm that my...
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