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  1. Jeremy Harris

    Web hosting/blog advice

    For the past year or so, I've been working towards building a new very low energy house (long story, it took a year just to buy the land). During the process of finding the plot, resolving legal issues, designing the house, submitting planning permission etc, I've amassed a fair bit of...
  2. Jeremy Harris

    Another Lebowski controller

    Ages ago Lebowski was kind enough to let me have a couple of programmed dSPIC30F4011 chips, as used in his neat controller and I promised to start a thread here when I started making a controller with them. I have plans to build a pretty big controller with one of the chips, but thought I'd...
  3. Jeremy Harris

    BMS and GBK are the same company.....

    Just a tip for those who, like me, have had somewhat mixed dealings with BMS Battery (see here for my tale of woe: http://endless-sphere.com/forums/viewtopic.php?f=3&t=42777). When my motor etc finally arrived from BMS Battery, there was an error made on my address, which has resulted in a few...
  4. Jeremy Harris

    Tablet advice - iPad or Android?

    Some background: I currently use an old Samsung netbook for browsing, email, viewing photos when out and about, etc. It's fine, but is showing it's age and there's a fair bit of wear and tear on things like the touch pad and keys, so I suspect it won't be long before it starts to get a bit...
  5. Jeremy Harris

    The joy of wheelbuilding............

    Although I've built/rebuilt a fair few bikes over the years, I've always fought shy of building wheels, for some reason. I decided that now was the time to have a go at building a wheel, just to see if it was as hard as I've always thought. I'm really pleased to say that wheel building really...
  6. Jeremy Harris

    Bafang BPM motor data

    Like others, I suspect, I've struggled to find good data on the true Kv (RPM/V) for the BPM motor. The vendors seem to advertise confusing, meaningless or just plain wrong data, expressed as "RPM at 36V", often without saying whether this is no load or loaded. I did manage to find a table from...
  7. Jeremy Harris

    Can someone measure a Zippy 6S, 20C, please?

    An odd request, but I'm hoping someone can help me out. I have a couple of Zippy 6S, 20S packs on their way, but need to try and work out a way of fitting them into a case I already have. I had some 3S, 20C Zippys and assumed these would be the same cells, so measured those and all seemed OK...
  8. Jeremy Harris

    Lightweight folder - build thread

    *** Title edited - this will now be the build thread *** Some background. I use my full sus folder ebike more than any other, it lives in the back of the car and gets used a lot, mainly for fairly short trips around the local city, never more than around 10 miles, mostly trips of maybe 4 or 5...
  9. Jeremy Harris

    The Cordless Canoe Challenge

    Last year a boat magazine got together with Makita and ran a race for cordless tool powered boats. I built a boat and entered, but my drive leg was damaged before the race by one of the spectators, stopping me from competing. This year I'm having another go, with a new boat. The boat I've...
  10. Jeremy Harris

    RFID power switch - (techie stuff!)

    One thing has bugged me with each of the ebikes I've built, the clunky way we have to turn them on and off. Up until now my daily use ebike has had a key switch, that turns the pre-charge and controller on, and a plug in power link that connects the main power. The turn on procedure is to turn...
  11. Jeremy Harris

    40kW motor?

    http://www.freeair.cz/freeairen/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=168&category_id=49&option=com_virtuemart&Itemid=53 Looks interesting, the weight is only 8kg, although the price is a bit steep. They also do a 20kW version...
  12. Jeremy Harris

    A different 12kW motor

    This was sort of linked from Marko and Hal's thread, but so as not to confuse, it's worth a thread of its own: http://www.freeair.cz/freeairen/index.php?page=shop.product_details&flypage=flypage.tpl&product_id=172&category_id=51&option=com_virtuemart&Itemid=53 The same company also do a 7kW...
  13. Jeremy Harris

    Simple low current LiPo charger

    I'm putting together a small LiPo pack for a non-technically minded person, so was looking for a plug-in-and-go charging solution, one that didn't involve pressing buttons or looking at displays. The pack is a modest 7S one, and there isn't a need for fast charging, 10 to 12 hours would be...
  14. Jeremy Harris

    Turnigy LiPo quality?

    The first batch of LiPo batteries I bought were 5Ah, 20C Zippys. They were excellent, all arrived with cell voltages matched to within about 10mV and they have stayed in balance extremely well in use. The next batch were Turnigy 5Ah, 20C and these weren't so well balanced when they arrived...
  15. Jeremy Harris

    DIY Dyno

    Whilst developing the simple BLDC controller, I've found that I needed to load the test motor predictably to see how the controller stands up to conditions like high torque, low RPM and make sure that the current limiting and controller protection circuit works properly. I was originally just...
  16. Jeremy Harris

    Best ebike build of the year?

    I thought it'd be fun to collect some views on the best ebike build on ES that was finished in 2010 (if any ebike build ever is really finished). Two stand out in my mind: - Kim's (a.k.a. Aussie Jester) "Turnigy HXT Powered Custom Cruiser", for it's style, design and the quality of its...
  17. Jeremy Harris

    Simple BLDC controller

    I've been working for a while (very slowly, due to other distractions) on a simple, no frills, BLDC controller, using an off-the-shelf linear BLDC controller chip. Today I managed to put some more time into it, and have knocked up the first prototype circuit board lay out. Here's the circuit...
  18. Jeremy Harris

    Mars Electric LLC Axial Flux Motor

    Well, I'm a bit pissed off. Unlike one or two on here I've no history with this guy, so don't have any prejudices. However. I've spent around 5 hours today doing some detailed analysis of the axial flux motor design that he detailed on here, only to find that all my work has been deleted by...
  19. Jeremy Harris

    15S LiPo charger using DC DC converters

    I've just found these on eBay: http://cgi.ebay.com/SynQor-PQ48050QNA20NNS-DC-DC-Converter-48V-5V-Out-/380224535349?pt=LH_DefaultDomain_0&hash=item588725fb35 They look interesting for building fairly high current (20amp) LiPo balance chargers. The spec on these SynQor converters is more...
  20. Jeremy Harris

    Anyone got pedelec working on a XieChang 116?

    I'm struggling to get pedelec to work on my folder. I want to have a play with different ways of processing the pedelec signal, but can't even get the darned thing to work! Here's what I've done: I have a double pole switch that in one position connects the throttle voltage signal to the...
  21. Jeremy Harris

    Simple ebike 'fuel gauge'

    I know that having a Watts Up or Cycle Analyst bolted to the handlebars gives you loads of useful information, but most of the time I find I only want to know two things: 1. How much battery capacity do I have left? 2. How much current am I pulling? For practical purposes you only really...
  22. Jeremy Harris

    Round the World - pedalling

    An aviating friend of mine is cycling around the World, on a fairly highly modified trike. He's pretty keen on electric propulsion, so I'm going to link him to the ES for some ideas. Meanwhile, here's a link to his blog/website (I warn you now, he can be a bit 'full on' at times!)...
  23. Jeremy Harris

    Finished eBay bargain ebike

    Over on this thread: http://endless-sphere.com/forums/viewtopic.php?f=2&t=21630 I mentioned a new ebike that I picked up on eBay. It came minus battery pack, charger etc and had a couple of niggling electrical faults, but I've now built a proper pack for it, made a BMS and modified a spare...
  24. Jeremy Harris

    Stealth folding bike - UPDATE

    Having sold my e-recumbent that I built a few years ago, and having finished the bargain ebike for my Mother in Law, I decided to build myself a lightweight, relatively low power, folding ebike: I happened to find another bargain on ebay, from the same seller of bankrupt stock that I bought...
  25. Jeremy Harris

    Bargain buy on eBay

    My mother-in-law mentioned a while ago that she'd like to ride her bike again, but was finding pulling out into traffic a bit tense, so I suggested a nice light ebike might be the answer. Lo and behold, this comes up on eBay: I made a daft bid and got it for just £129.99 (around $197) and...
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