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  1. 2

    Ebike Battery Monitoring and Control System

    Yes, pack surgery is tricky at the best of times. I always cycle test the individual cells a few times and measure the internal resistance to try and weed out duff cells before assembling a pack. So far, I've only had to do pack surgery once, and while it is tedious, it's not overly difficult...
  2. 2

    Ebike Battery Monitoring and Control System

    Nothing fancy. As long as it has minimum internal dimensions of 50 mm high (or 2") and 44 mm width (or 1 3/4") it will work. You could probably even use plastic rectangular gutter down pipe like this if it has the right dimensions. I just search for "extruded box section", cut it to length...
  3. 2

    Ebike Battery Monitoring and Control System

    Well, it's been quite some time but I've picked up this project again a few weeks ago. As I was the one originally bringing up the Intersil chip, I thought I'd at least report my progress. I've just ordered the revision 2 boards from OSH Park. 3 boards for US$20 shipped free world-wide is a...
  4. 2

    eBike Master Switch Design

    I buy most of my stuff from Farnell's (UK) and shipping is very reasonable. I'd be very surprised if they didn't have an equivalent type of P-FET. Have you tried searching their website by parameter as needed?
  5. 2

    eBike Master Switch Design

    You might want to try Farnell. They have distribution in Austria. Also, Ebay is worth a try.
  6. 2

    eBike Master Switch Design

    Can you use the renderings for further work? For example importing it into SolidWorks? Can you render it with components?
  7. 2

    Ebike Battery Monitoring and Control System

    Alan, any updates on this project. I am curious if you had a chance to power-up the board yet, or any other progress you've made.
  8. 2

    New freeride project - LMX P1

    You can also get them in 26" trials size.
  9. 2

    New freeride project - LMX P1

    Have you looked at BMX trials wheels? They are 19", even though they are called 20", and allow you to fit fat off-road tyres, and the rims tend to be stronger than bicycle ones. Something like this...
  10. 2

    New freeride project - LMX P1

    Is this you, bzhwindtalker? http://youtu.be/REeeYtp-8qE
  11. 2

    Ebike Battery Monitoring and Control System

    I used one like this: The front opening infrared toaster ovens are nearly impossible to get in the UK. I bought mine wholesale and it was cheap, about $30 in US dollars.
  12. 2

    Ebike Battery Monitoring and Control System

    Just built a reflow oven using one of these kits: http://youtu.be/fI2esJriqzg He's a young kid whose developed it. It works well and was about $50. You just need to buy a cheap toaster oven. Makes SMD assembly MUCH easier! Recommended.
  13. 2

    Ebike Battery Monitoring and Control System

    I have it on pretty good authority that purple circuit boards don't work all that well! :lol:
  14. 2

    Ebike Battery Monitoring and Control System

    Looks great! What did you use to render it and what file format is the output?
  15. 2

    Ebike Battery Monitoring and Control System

    That OSH Park supply sounds very good. I usually use a more local (to me) supplier which charges 55 Euros for about the same board space. I'll have to check if they do international shipping and whether that's still economical. At the cost of OSH Park, it not even worth bread boarding anymore.
  16. 2

    Ebike Battery Monitoring and Control System

    I just use a very low ground pin current voltage reg (< 4uA typ.) to keep the micro powered in sleep mode from which it wakes periodically. It then wakes the Intersil chip, measures the voltages, temp, etc., transmits results back to master and goes back to sleep. When charging, it's always...
  17. 2

    Ebike Battery Monitoring and Control System

    That's a pretty good list. While I've adapted the schematics and completed layout of my existing design to use this chip, I won't get much beyond that in the next 2-3 monts due to lack of time. That is, I won't actually build PCBs or rewrite the micro code. I *might* be able to sneak some time...
  18. 2

    Looking for a power supply

    I did think of putting them in series, but what happens if the constant current is unequal, even slightly? I want to have a means to set the current anywhere from 0.1 to 5A, sort of like dimming LEDs.
  19. 2

    Looking for a power supply

    Ideally, I'd like to have single box. I already have a setup like you're suggesting using a lab power supply and server supply combo. But, as I said, I'd rather a cleaner, single box setup. My BMS already does all the functions during the charging process. I just need an adjustable current...
  20. 2

    Looking for a power supply

    Yes, I looked through the Meanwell range but couldn't find a suitable one.
  21. 2

    Looking for a power supply

    I am after some pointers in the right direction for a new power supply that I want to use in a new project. Main specs are: - runs off-line, ideally something like 85-265VAC, 50.60 Hz - constant current output which must be adjustable from 0-5A - maximum output voltage 60V or higher - high...
  22. 2

    Ebike Battery Monitoring and Control System

    Has anyone taken apart one of those Cell Log devices? They are cheap, fairly accurate and would seem to be a good analog front-end for a BMS. How do they solve the level shifting? As it has an LCD display it presumably uses a microcontroller, but what's in front of it? Anyone know?
  23. 2

    Ebike Battery Monitoring and Control System

    Surely, it should be pretty straightforward to communicate over the I2C interface, no? I know, I know, famous last words!
  24. 2

    Ebike Battery Monitoring and Control System

    Here is what I got from an apps engineer at Intersil in response to a few questions. Answer 1 is encouraging. 1. The ISL94208 was just released, so it should have at least 10 years product life. 2. The TEMP3V, CFET, and DFET pins can be left unconnected. ISREF, CSENSE, DSENSE, VMON, and TEMPI...
  25. 2

    Ebike Battery Monitoring and Control System

    Alan, our designs seem to converge at an alarming rate! LOL. Planning on using as much balancing current as I can. Clearly some thermal management will be needed. The chip has a thermal pad, so hopefully that can be used to good effect. This is one of the things I want to test in an actual...
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