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  1. bobmutch

    Electric Fat Tire Trike

    I'm buying it far a single mom with 6 children, 4 in the home, she'll use it to go get groceries and to go to the food bank, and other appointments, we're going to get a trailer that she can tow the two younger children seven and nine.
  2. bobmutch

    Electric Fat Tire Trike

    I'm very interested, I'll take it if I can arrange pick up, PayPal payment works for me or cash, I'm just working on geta someone in your area to pick it up for me. Can you DM me your phone number plZ.
  3. bobmutch

    kWeld - "Next level" DIY battery spot welder

    I understand E=Pt and P=IV. So I used 18J setting for 0.1mm nickel and 30J for 0.2mm nickel. My question was if I change from one approved battery to another will the J setting on the kWelder need to be adjusted or will it be the same. It sounds like the same Energy setting should work as long...
  4. bobmutch

    kWeld - "Next level" DIY battery spot welder

    I know you have to re-calibrate with each different battery you connect to the Kweld, That wasn’t my question.
  5. bobmutch

    kWeld - "Next level" DIY battery spot welder

    A couple questions to tatus1969: 1. With the kweld the adjustment for different welds is in energy J. I'm just wondering if there will be a difference in the weld energy used in each weld when your battery is fully charged and when the battery is close to the LVC? or will the setting of 20J...
  6. bobmutch

    My Chinese Ebay Build

    beautiful build, you did a really good job!
  7. bobmutch

    soldering vs spot welding debate

    3 second solder job Should do one one weld at a time as you go down the line and then come back and do the 2nd weld then come back do the 3rd weld. The worse I could find on the video Like this, one weld at a time. Video where you can see all this. THERMAL CAMERA Imaging of...
  8. bobmutch

    Grin Phase Runner / CA3 and BBSHD

    Could you post a URL to the that thread plz. I've read this thread over a few times. I'm considering getting a PRv2 and setting it with my CA3 and BBSHD. I ordered a BAC800 and 750C-72Vn from Allen so it will be fun to compare the two of them together.
  9. bobmutch

    Stealth Bomber & Frame w/Tons of parts

    I'm interested in the 4. 96V Charger -$80, what are the specs, 96 volts nominal? how many amps, CC/CV? adjustable?
  10. bobmutch

    18650 21s15p - 3 layers of 7s (balanced separately) advice

    I don't have as much experience as you do so... but I don't think they that the current which travels serial from cell to cell is not going to take the long way around and go from the cell over to half way between the next cell in it's P=group then across the copper wire back to the 0.15x7mm...
  11. bobmutch

    18650 21s15p - 3 layers of 7s (balanced separately) advice

    I like the plates, 0.15mm plates are 18mm and good for 18A, the 0.2mm plages are good for 1.33 times more or 24A. I like how you did the POS exit-wire by splitting the wire and soldering the braid pre-welding. Lots of guys are laying the whole wire down the length of the P-group but have there...
  12. bobmutch

    Big 100 Volt 54 ah Battery build

    I’m not sure which is the best way. Or I’m not sure which is the correct way. I guess the proper way would be to calculate the serial to serial nickel connection as an additional serial resister and the addition parallel to parallel Bickel connection as an addition parallel resister. Or perhaps...
  13. bobmutch

    Big 100 Volt 54 ah Battery build

    I don't see how you are getting the need to "sum both resistances". Rp = Sc / Pc * IRc is the correct calculation. Rp = Resistance pack Sc = Serial cells Pr = Pack & BMS resistance (rated at 2P for all packs) Pc = Parallel cells IRc = Resistance cell (IR of cell) Vs = Voltage sag I = current...
  14. bobmutch

    Big 100 Volt 54 ah Battery build

    Vs=I*Rp so Rp=Vs/I so (97V-84V) / 230A = 0.0565 or 56.5mOhm I don't think 56.5mOhm is all the bad for a battery pack but let's take a look at the pack calculation. Your using Samsung 30Q cells which have a 20mO IR DC https://eu.nkon.nl/sk/k/30q.pdf Rp = ((Sc + Pr) / Pc) * IRc Rp =...
  15. bobmutch

    ISDT BG 8s

    Did you ever find out if they can be run in series?
  16. bobmutch

    kWeld - "Next level" DIY battery spot welder

    This pack is using parallel busbars, current travels serial, don't copy this poor design.
  17. bobmutch

    Battery design for POS/NEG wire connections -- Which way is better? see pic.

    I don't see why that would be, the 1st and 9th cells in the last serial cell group are both connected to the "parallel wire busbar" by same size nickel strip that is used all the along the serial path from the first serial cell to the last. So it won't get any hotter than the other same size...
  18. bobmutch

    Battery design for POS/NEG wire connections -- Which way is better? see pic.

    Is my position in 1. right or wrong? Can I have some feed back 2. please? 1.Here is an example that looks good but in reality B- wire is only connected to the 2nd last cell (see pic below; pic from https://www.myah.com/blogs/diy-energy/18650-battery-safety-guide ). I see people doing this...
  19. bobmutch

    kWeld - "Next level" DIY battery spot welder

    Hi tatus1969, What is the oldest hardware version of the kWeld that can be updated with the new firmware and has all the features of the new r3.2/1804 (or what ever is the current model)? Ok I found the kWeld rev2 upgrade.pdf and it seems the "new voltage regulator with an extended input...
  20. bobmutch

    kWeld - "Next level" DIY battery spot welder

    Hi PaulD, I am interested in your parallel gap spot weld head setup. Did you do a thread anywhere on this unit? I would like to produce one very similar for my personal use. Looks like some of the parts where 3D printed? Thanks in advance for any information. Bob SMS text 519-636-6636
  21. bobmutch

    Meanwell clone- AD488.3-400W power supply mods

    What the configuration of your LiFePO4 pack? volts? Ah? kind of cells? BMS? What kind of a charger are you using? If you are doing a bulk charge to a non-BMS'ed battery pack you could monitor the cells with a 8S voltage monitoring unit. You can set a HVC and it will activate an auto alarm.
  22. bobmutch

    Meanwell clone- AD488.3-400W power supply mods

    I don't like the above PSU any more, this below is batship. What is the crazy stuff they want you to do below? Like you have to plug this adjust current plug into the PSU then set you current and shut the PSU off and then remove the plug then turn it on again. Thanks batship. Operational...
  23. bobmutch

    kWeld Spot Welder Questions 2018.09.27

    According to mToll's numbers 0.3mm is good for 2A per 1mm of Nickel so 0.3mm x 10mm will be 20A acceptable.
  24. bobmutch

    kWeld Spot Welder Questions 2018.09.27

    Look into CuNi18Zn20 (Copper Nickel Zinc Alloy) for connecting strips or plates for battery building. Timo Hoyer from Germany uses it. https://www.facebook.com/timucin.hoyer
  25. bobmutch

    kWeld - "Next level" DIY battery spot welder

    Do you have more information on this weld head system in the picture? Have you done a post anywhere else about this. I am very interested : )
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