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  1. rwaudio

    JP spot welder

    Mine has been going strong for years (10's of thousands of welds). Switched to a more flexible car audio power cable which makes it a bit nicer to use. Using 3S Sinopoly 100Ah LiFePO4 cells, quite degraded from use in a car, but works VERY well.
  2. rwaudio

    JP spot welder

    Get well soon! I assembled another pack yesterday and couldn't help but think of you.
  3. rwaudio

    200km Trek build with custom aluninum battery box

    That looks sweet, thanks for sharing, I'm going to have to try vinyl wrap now!!
  4. rwaudio

    200km Trek build with custom aluninum battery box

    Thanks for the pic chucho, I may have to look into that. I'm starting the proper battery box for my fat bike, maybe I'll plan to wrap that one. The current tool bag is functional but I need to work on the actual battery and box for the bike.
  5. rwaudio

    200km Trek build with custom aluninum battery box

    The bikes owner liked the look of the raw brushed aluminum so much that we left it that way. Mine was built in the same style on a similar Trek and will be painted black. If he prefers the aluminum look it will just get clear coat or anodized, otherwise it might end up black as well. I've been...
  6. rwaudio

    200km Trek build with custom aluninum battery box

    I don't see how they would break, but I guess only time will tell. The controller is built into the motor, the battery is the only thing in the box.
  7. rwaudio

    200km Trek build with custom aluninum battery box

    It's finally done so I figured I'd show off the results. The bike is a Trek DS8.6 which is a great platform for a cruiser/commuter. Motor is a Bafang 750w mid drive kit Battery is a custom 18650 pack 14S13P using Samsung 2.6Ah cells (1.75kwh) Battery box is a custom aluminum triangle to hold...
  8. rwaudio

    JP spot welder

    Thank you! I couldn't have done it this easy without your welder. Yeah, that's for the customers bike in the background, Trek DS8.6, he wants to be able to ride from Calgary to Canmore 104km (then possibly on to Banff another 27km). My fat bike may get a larger pack, less cells, higher...
  9. rwaudio

    JP spot welder

    First large pack done. 14S13P, 182 cells, Samsung 2600mah, should work well with the 750w BBS02. Welder worked great and once you get the hang of it you can immediately tell if the time is too high/low when you go to different materials or when welding through two layers etc. Very happy with...
  10. rwaudio

    JP spot welder

    I reconfigured for 3S and it works perfect. These are the reject Sinopoly cells from a car, they have high IR and some self discharge, might get away with 2S using good cells, but this gives new life to otherwise useless cells.
  11. rwaudio

    JP spot welder

    My device arrived as well, very nicely made and well designed. I think it's a little hot with 4 cells, (Sinopoly 100Ah cells) I'll probably drop down to 3 cells now that they're charged, not quite enough range on the dial on thinner material. It is nice that you have a bit of extra control by...
  12. rwaudio

    375Volts Celllog

    Very nice!! I've been contemplating copying his overlapping mounting technique when I actually get the full count installed in my Porsche.
  13. rwaudio

    a123 20ah short tabs

    I have a batch of similar cells and I'm having the same problem.. If the cells are cycled a few times with this "short" it eventually allows the cell to eat through the inner plastic casing and the electrolyte is then in contact with the aluminium layer of the casing, this speeds up the decay of...
  14. rwaudio

    celllog8s on EV1 Electfic Ford Ranger ( 350VDC)

    Very nice, I like the angled mounting of the boards (I hadn't actually thought of that when I designed the board), do you know if he's using the alarm loop or simply for logging?
  15. rwaudio

    Convert meanwell voltage output

    Yep that's getting closer! I've found that patience helps with finding the right dc/dc converter on ebay, so many surplus units pass through ebay it's just a matter of time till the right one comes up. (the question is are you still looking when it comes up though). Good luck.
  16. rwaudio

    How can I mod this watt-meter?

    That won't actually work as you describe. The best you could do is measure voltage of half the pack, but all other measurements are not possible. Current needs to flow through the meter so unless the OP is charging the pack with two separate isolated chargers each charging half the pack it...
  17. rwaudio

    Convert meanwell voltage output

    What you describe is possible but not with the dc/dc converter that you linked to. That one is not isolated, so as soon as you try to connect them in series you will be shorting everything out. You need to find suitable isolated dc/dc converters to make it work.
  18. rwaudio

    A123 Pouch Cell Recovery

    2.3v should be just fine for a one time event. The PL6 can't do 7 cells (the 6 stands for 6S charge/discharge) the PL8 would do 7 cells (or 8s)
  19. rwaudio

    Purchasing from ShenZhen Victpower Technology

    I've dealt with many good Chinese factories (but not a reseller) so I would say it's hit or miss just like buying from a US company. The short tab cells were $14.30US when I first sent payment but due to a "mistake" they were supposed to be $15.20 so before shipping I had to send an extra...
  20. rwaudio

    Purchasing from ShenZhen Victpower Technology

    I bought 152 cells, had similar issues that others are talking about. I can no longer recommend that anyone buys from Shenzhen Victpower. They simply will not stand behind their product, their mistakes or their promises. You may get lucky and actually receive what you order in suitable working...
  21. rwaudio

    A123 AMP20 Battery Pack Build...

    I honestly don't know anything about silicon bronze but a quick search of it's conductivity say's it's 5-20% as conductive as copper depending on the type. A 1/4" bolt with even 20% of the conductivity of copper is bad news at 450A. Your battery box is beautiful and appears to be very well...
  22. rwaudio

    A123 AMP20 Battery Pack Build...

    Nice pack, well designed and assembled. I have a couple of suggestion though, with my experience with these cells your end connections with the flat washer as the only thing "clamping" the outer tabs to the blocks. Is it possible to place a 0.125 - 0.1875" block between the washer and the...
  23. rwaudio

    Simple method of punching holes in A123 20Ah tabs

    I've tried a bunch of different methods of punching clean properly located holes in A123 tabs and nothing was working as smooth and efficient as I would have liked. Drilling makes very poor quality holes, hand held metal punches make better but still poor quality holes and are very tough to get...
  24. rwaudio

    Cheap and reliable BMS for a123 20 ah

    If you only want monitoring and not shunting my cell log 8 breakout module would do the trick for 24S (up to 32S on a single board) you would simply use 3 Cell Logs instead of 4. There are many ways to configure the alarms depending on your application.
  25. rwaudio

    My take on the DC/DC converter type charger

    Ever since I started my Porsche 944 conversion I've been working on an isolated DC/DC converter type charger that would allow me to charge/balance my LiFePO4 cells. This charger may never get used at full power because there are simply better more efficient options now that didn't exist when I...
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