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  1. dermot

    X5304 v BBS02

    I've been riding around for quite a few years now on my old 26" bike with an X5304 in the front. With my riding style and terrain, I average about 12Whr/mile on 52.8 V (16s 11AH LifePO4) with an ancient Crystalyte 35A controller. I'm thinking of shifting to a BBS02 750W - am I likely to see...
  2. dermot

    Wiring diag for Signalab 20S LiFePO4

    I have an unused Signalab 20S LiFePO4 BMS labelled E321748 and SH-S 94V-0 I've done a lot of searches here and elsewhere and can find pretty much everything *except* the one bit of information I need: How to wire the thing up to the cells and charger/controller. I have an older one with a...
  3. dermot

    Balancing time

    These little balancing boards can bypass 1.7A - good when characterising old used A123 cells. 5 cells down 115 to go....
  4. dermot

    Solar / low voltage charging

    Quite some time back, I commented on a thread about a DC-DC converter I was designing to charge up to 72V from a 12V DC input to charge my folder while it was in the car. Well, it sort of worked, but not reliably or efficiently enough to want to post it here. Recently, I bought several of...
  5. dermot

    Turnigy wattmeter repair

    Just doing some capacity matching/measurement on a bigger A123 pack and have popped my Turnigy 130A power meter - I'd forgotten that it had a limit of 60V - it has worked at 66V for a long time, but it hit 72V today for an extended period and the display flickered and there was a 'pop' sound and...
  6. dermot

    Charging batteries in the car

    For a while now, I've been looking for solutions to charge my folder batteries while the bike is in the car. I've built a couple of devices, but found them rather inefficient due to difficulties manually winding transformers. Also found a couple of low power DC/DC converters on ebay which...
  7. dermot

    Sensorless controller choices

    A question for the group mind, as I've still not resolved my sensorless controller problem: http://endless-sphere.com/forums/viewtopic.php?f=2&t=48391 So what is the sensorless controller (and supplier - I'm in the UK) of choice these days? I'm wanting something in the range of 72V max volts...
  8. dermot

    How to remove a Sunrace freewheel from an X-Lyte 5303?

    I need to remove this SunRace 5 speed freewheel from a 5303, but I can't seem to find information on the appropriate tool - all I have is a standard chainwhip and the usual hand tools. It may not be clear in the image, but it is stamped with SunRace Freewheel B0525 Do I need a specialist tool...
  9. dermot

    Sensorless Crystalyte

    Now that Spring is here and Summer is on the way (hah!), thought I'd pick up on a project started and then deferred last year - now I've forgotten where I'd got to. The one on the left (72V-45A) works fine (and interestingly, LVC cutoff is actually 41.5V rather the the 55V specified) just fine...
  10. dermot

    Nuts for 5303/4 motors

    I have both 5304 front and 5303 rear motors - the '03 came without nuts and I've just lost one from the front motor that I use daily. I'd previously ordered a couple of spares from Crystalyte Europe, but I've just tried to fit one and they are the wrong thread. Anyone know what thread/size...
  11. dermot

    Controller advice needed.

    OK, I have two Crystalyte controllers for which I need a couple of pointers: One (bought on here recently, but is a couple of years old) is a 72V/50A one - works fine, but LVC is 55V - Ideally, I'd like to drop the LVC to 48V or even a little less since I am using 20series LiFePO4 not LiPo and...
  12. dermot

    Magic Pie on Murdoch Mysteries?

    Just watching a recent episode of Murdoch Mysteries - Who Killed The Electric Carriage - and saw what appeared to be a Magic Pie in the rear wheel of a three wheeler. Although billed as being capable of over 50mph, it looked to be doing maybe 30mph peak. Still not bad for a single hub motor...
  13. dermot

    Seal of approval for Crystalyte controllers

    Looks like at least one member of the avian race has given the seal of approval for Crystalyte controllers.
  14. dermot

    Notes on fixing a Crystalyte controller.

    My Crystalyte 36/72V 35A controller (married to a front wheel X5) shuddered to a halt a couple of weeks back. I have a Lyen controller as a spare, but it didn't drop in at all well (more on that later*). Yesterday, I had a go at fixing it - when I took the board out of the housing, I found...
  15. dermot

    HS or HT for Dahon?

    I use a fullsize Dahon with an X5 for most of my riding, but also have a Dahon 20" folder with a front 209 for occasional use to take on the train/bus or in the back of the car. My back is giving me grief again (which is why I adopted e-bikes in the first place) and I'm finding that the 209 is...
  16. dermot

    cheap TC54 on ebay

    $7 including postage for 20 x TC54 2.1V detectors, as used on many DIY (and other) BMS designs. Surface Mount style, though I've soldered on tinned copper and covered in a blob of epoxy... From user - Connectorstock - have just ordered a pack. dermot
  17. dermot

    Cell matching software

    I have over 150 used A123 M1 cells and have tested them individually for capacity and leakage - they all run between 1.92 and 2.28AH each and hold above 3.5V for a week after charge. I want to assemble them into a 7P 20S pack and match them so that all parallel modules have the same overall...
  18. dermot

    Beefing up a 15Amp Signalab BMS - SUCCESS!

    This is a pic of a Signalab 15Amp BMS that I have, purchased from all-battery.. I now need a bit higher current limit on discharge; looking at all-battery, the only difference between the 15A and the 30A model is the extra 'resistor' on the shunt and two extra unmarked FETs on the output side...
  19. dermot

    How-To video to modify ATX PSUs

    http://jumperone.com/2011/06/atx-power-supply-tutorial/ Best tutorial I've seen to mod old computer PSUs. dermot
  20. dermot

    50cycles bike question

    Anyone happen to know if this bike: http://www.50cycles.com/product.htm?product=tonaro-bighit has the controller integrated into the motor, or the battery box? Having had one motor-integrated controller fail, I'm reluctant to recommend this to a friend unless it lives outside the motor...
  21. dermot

    prebuilt packs from an EU supplier

    I'm not in the market for any packs at the moment (apart from a handful of A123 2.3AH cells to fill out a couple of packs) but when browsing on Ebay earlier today, came across these people: http://www.ev-power.eu/index.php?p=productsMore&iProduct=366&sName=evbat36v10a-lifepo4-36v-10ah They...
  22. dermot

    How to keep cycle lanes clear?

    The mayor of Vilnius has an idea or two... http://www.bbc.co.uk/news/world-europe-14380367 dermot
  23. dermot

    T shirt idea

    Our local cycling advocacy group - Cyclox - has printed a few T shirts pushing cycling over driving and it occurred to me that one for e-bikes might be a bit of fun. I'm thinking of a skeleton image of a bike with a hubmotor and the electrical symbol for a battery on the rear carrier...
  24. dermot

    R/C Lipo monitor

    I picked up a couple of these 6 cell monitors on ebay for a song, but the vendor doesn't know the pinout details. I can make guesses myself, but I'd rather see if anyone has got these working before I start hanging wires on to see what happens. They can support up to six cells, so the two I...
  25. dermot

    Full suspension choices.

    The roads around here (Oxford UK) have suffered a lot of damage this winter and the county council has indicated that there is very little cash for road repair. I've been finding it very uncomfortabe these last few weeks (even with a suspension seatpost) - not to say dangerous, so thinking of...
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