Recent content by daniel.weck

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    My e-Brompton: Tongxin/Nano pulling steady at 360W+

    Nice for extra top speed! I would love to compare with the low-end torque of my 190rpm model. In case I am wrong in my assumption about mechanical gearing demultiplication (relative size of friction rollers), then the technical difference to achieve the various RPMs must be in the internal...
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    DIY stage 9: A123 "nano" battery pack [photos]

    A bit cheaper here by the way, but not in my layout configuration unfortunately: http://www.a123rc.com/goods-165-Free Shipping 6s 2300mAh A123 Battery Pack - Craft.html Dan vs
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    DIY stage 9: A123 "nano" battery pack [photos]

    Ah, I really just need one A123 cell, but given how expensive a single one is (AMR 26650 M1-A 2.3Ah, or even worse: the more recent M1-B 2.5Ah), I thought I might as well purchase another pre-built pack (6S1P) from sz_ohmygod @ eBay (Hong Kong): http://www.ebay.co.uk/itm/200919174943...
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    My e-Brompton: Tongxin/Nano pulling steady at 360W+

    Today's ride (as indicated by Cycle Analyst): 15km => 2.8Ah consumed from my 10Ah LiFePO4 battery. http://www.pedelecs.co.uk/forum/threads/diy-stage-2-received-li-ping-lifepo4-battery-photos.4734/page-2#post-216434 It's quite hilly around here, and it was windy today. Max current draw was...
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    DIY stage 2: received Li Ping LifePo4 battery [photos]

    It looks like the trick consisting of topping-up the 2x individual weak cells in my LiFePO4 pack has worked its magic (3.6V normal charge voltage + 1C charge current ~2.3A ... although I tried 5A as well on one occasion). The procedure basically boils down to balancing the pack manually...
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    My e-Brompton: Tongxin/Nano pulling steady at 360W+

    Yes, good memories! Experimentation, technical apprenticeship ... still learning though ;) Both my controllers are based on the EB806 board (precursor to EB206 which comes with an upgraded Infineon chip), so the programming options are limited. However, I get everything I need: - Speed...
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    My e-Brompton: Tongxin/Nano pulling steady at 360W+

    It's been a while since I last used the 36V Bafang "8-Fun" SWXK 255rpm hub motor (rated 250W) which I have laced into my 16" Brompton wheel. Instead, I have been riding with the much quieter 36V Tongxin 190rpm (rated 180W). Both motors are brushless no-Hall-sensors with 3 phase wires (I use the...
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    Changing the LVC of a controller

    FYI, as my controllers are EB806 board + Infineon XC846 (not the more recent EB206 + 116 chip model), I had to swap the pinouts as follows: Oh, and the EB806 circuit board does not seem to be supported by the cross-platform XPD (eXtended Parameter Designer) Python-based utility app, but...
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    DIY stage 9: A123 "nano" battery pack [photos]

    Ah yes! Thank you for the tip. :)
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    DIY stage 2: received Li Ping LifePo4 battery [photos]

    Interesting, thanks for sharing! I don't have any swollen pouch / prismatic cells in my pack though. I hope it is just a typical LiFePO4 cell discrepancy. I have not used this pack a lot actually, but I have owned it for some time. whilst in storage, I did not float-charge the cells frequently...
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    DIY stage 2: received Li Ping LifePo4 battery [photos]

    Okay, so out of the 12 LiFePo4 cell pairs, 10 of them settled at 3.6V after a full charge (allowing sufficient time for the internal chemistry to stabilise: from 3.7/3.8V immediately after end-of-charge, to 3.6V after ~30mn or less). The 2 remaining cells settled at ~3.3V, i.e. slightly above...
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    New "Flat-Less" Schwalbe Marathon-Plus Tyres for 2014

    I have had Marathon Plus tyres on my Brompton (16" wheels) for some time. Really hard-wearing, no punctures so far :)
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    Lidl Workstands

    My local LIDL has the updated version of the stand I bought some time ago. The main difference is quick-release fasteners, to replace the basic "screw on" design. I have been using the stand without any problems, great piece of kit for the price! Dan
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    DIY stage 2: received Li Ping LifePo4 battery [photos]

    Ah, one red LED is now constantly off, even after several attempts to give the built-in BMS some time to balance the prismatic pouch cells. Normally, each cell reaches full capacity (ceiling voltage threshold) at the end of the first phase of the charge cycle, all the red LEDs go red, and the...
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    DIY stage 9: A123 "nano" battery pack [photos]

    Ah, one A123 cell in my 6S pack is now "properly" dead. :( (~0V) Should I attempt to replace the cylindrical cell? (I have basic soldering skills, but the metal tabs look spot-welded, or something like that) I know Jerry Simon has tons of experience with self-made battery packs, thoughts? ;)...