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  1. sal_park

    WIRING CONNECTIONS TSDZ2

    Assume you are after something like pinout or wire colours ? Have a dig around here and you'll find some: https://github.com/OpenSourceEBike/TSDZ2_wiki/wiki eg https://github.com/OpenSourceEBike/TSDZ2_wiki/wiki/Wire-860C-850C-to-TSDZ2 hth
  2. sal_park

    New build advice

    Hi, I built a couple of ebikes a few years ago (since sold) and am getting the itch to build one again and thought it would be a good idea to check here in case there are other/better ways of going about this that people might be able to suggest. I'm looking to build a full suspension ebike...
  3. sal_park

    Battery question

    Looks like my old charger was toast: my new charger has just charged the battery to 41.87v.
  4. sal_park

    Discharging LIPO help

    As someone else said above use car headlight bulbs. I used 3 in series on my 36v li-ion battery and that was good for around 4-5 amps if I remember correctly. You need to match the voltage of the bulbs with the battery voltage so if your 4s battery is 14volts (close enough to 12v) then just put...
  5. sal_park

    Battery question

    Hi, I did do that, but didn't put the results in the post, I guess I forgot. When I measured the voltage of the first cell at various point in the charge cycle the voltage slowly rose to around 3.9something. I also measured the current which was a bit all over the place but the max I saw was...
  6. sal_park

    Battery question

    Yea, I tried to measure the voltage from the charge lead, but didn't get anthing - I suspect the resistance of the DVM was too high so the charger would not turn on. I then plugged the charger into the battery and the DVM into the output plug from the battery. With the charger off: 39.something...
  7. sal_park

    Battery question

    So I opened it up, and sure enough it's got a full in BMS in there :( I measured the cell voltages before charging it (it was at around 50% charge state at this point): (lowest 3.666, highest 3.775) 3.775, 3.775, 3.770, 3.770, 3.774, 3.769, 3.774, 3.666, 3.773, 3.770 I then charged on my...
  8. sal_park

    Battery question

    Thanks d8veh. Will update this thread when I've done that. sal
  9. sal_park

    Battery question

    Hi crea2k, I agree it would be better to use a balance charger, but right now I need to spend as little as possible to eek out some more use of this battery. In the medium term I'm going to replace it with some RC packs from hobby king which will be balance charged. sp
  10. sal_park

    Battery question

    Hi, I've got a 36v 10Ah Li-ion battery, and I've had it for a year or so and probably used it for 200 charges or so. Anyway, now it seems to be way down on range - it will cut out after a mile or so. If I turn the battery off/on it will always start again but would cut out (LVC) if I draw too...
  11. sal_park

    Final Year Engineering Dissertation

    Generic battery from china, 10Ah 36v
  12. sal_park

    Correct Wiring to Use Through Bike Frame Magic pie 3 1000w

    Have a look at this http://www.powerstream.com/Wire_Size.htm For a bike you need to look at the "Maximum amps for chassis wiring" and I would probably pick something like 12AWG which you can buy from here (hobby king)
  13. sal_park

    Correct Wiring to Use Through Bike Frame Magic pie 3 1000w

    the above post is trying to be help. Blunt sure, but help. The batteries and power in these system can be dangerous. Have a read through this thread here.. Something else that is really good to understand: the current carrying capacity of a system needs thick wires. The voltage carrying...
  14. sal_park

    Correct Wiring to Use Through Bike Frame Magic pie 3 1000w

    I would say that motor would be capable of drawing way more than 13 amps. I've not used one myself, but my 500W motor can draw more than 20 amps at times No, it too thin. It will probably heat up and melt the insulation. If you're lucky (and have a fuse) it will blow this and you'll have a...
  15. sal_park

    48 volt pack wires running hot

    I doubt it, I suspect that on the battery it says something like 4.6Ah ? This means that the pack can supply 4.6 amps for 1 hour or say 0.46 amps for 10 hours - it has nothing to do with the maximum instantaneous current the battery can supply. I suspect that your setup with a 1000W motor will...
  16. sal_park

    Open source integrated EV Electronics system

    Hi, not sure how useful this will be, but I built / developed and open sourced my electric range meter. Here is the sourceforge page: http://sourceforge.net/projects/bangxietymeter/ It's not complete, but works. I've not fully documented it, but would be happy to answer questions on it. It...
  17. sal_park

    Breaking UK/US Motor Wattage limit.

    I'm in the UK too (London) and would echo pretty much what d8veh said. I used to have a 250w front motor and have moved to a 500w bangfang (both 36v). I've never had any bother and almost everyone I've asked (90%+) don't even recognise it as an electric bike at all. My personal compromise...
  18. sal_park

    li-on battery charging question/problem

    About 2-3 hours which has been consistant over the life time of the battery. Yes yes, last time I check it was around 40 volts. Will do in a sec
  19. sal_park

    li-on battery charging question/problem

    Hi guys, I'm seeing some odd/different behavior when my battery charges (36v Li-on). The charger has always got hot (the case temperature is hot enough so you don't want to pick it up) and I've drilled some holes in the case to try and aid air flow. The only feedback on the charger is a red...
  20. sal_park

    Considering open source Cycle Analyst/APM

    I've got a 500w motor and keep the current below 30A as this is the burst limit for my bsttery. If you use an arduino with his sensor it's worth looking through the example code I linked to above because you will NOT get good results by assuming Vcc is 5v. Finally, I've implimented a current...
  21. sal_park

    Considering open source Cycle Analyst/APM

    what about this to measure current ?
  22. sal_park

    12s2p range compared to 12s3p

    Sorry, I think this is not correct. For a given/set voltage the amount of power (in watts) that the motor will draw from the battery pack will be constant and only *ONLY* depends on the electrical resistance of the motor assuming: the temperature of the motor doesn't change the voltage of the...
  23. sal_park

    Considering open source Cycle Analyst/APM

    you might be interested to look at this thread which give all the details of the above project. sal_park
  24. sal_park

    Bangxiety meter thread

    Hi, I've been working on a project for the last 18 months or so, and now that it's in a fairly useable/functional state I've decided to share it here. So what is it ? It's an open source power consumption and range meter :D Right now you can download and compile the source code (it runs on...
  25. sal_park

    Considering open source Cycle Analyst/APM

    I use an LM2576HVT to take power directly from my 36v battery. Note it is really *really* Important to use the high voltage version (HVT postfix). The standard non-HV version can take just above 40V and my 36V is over 40v when charged. See if you can guess how I know it's a bad idea ? :oops...
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