Recent content by WheezyRider

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    Dc-dc off grid chargers

    If using a DC/DC converter for battery charging, it's important to set the constant current control (CC) to a suitable level for your battery pack. If it is set too high, it could do damage. Typically, (as VFR says) for a 10 to 15Ah/36V pack two to three amps is a good target. When the converter...
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    "ebike battery fire"

    Saw this today, anyone know any more detail about it, or is it just speculation? https://www.london-fire.gov.uk/incidents/2021/june/maisonette-fire-wood-green/
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    What do you use for cell welding?

    This guy replaced the secondary winding to get his to work properly:
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    What do you use for cell welding?

    This guy took quite drastic action to get his Sunko 788 working properly:
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    What do you use for cell welding?

    Interesting stuff. Here are some links I found that people might find useful: https://www.sevarg.net/2015/05/16/sunkko-788-welder-failure-and-repair/ https://georgehobby.wordpress.com/2016/11/09/diy-arduino-based-simple-spot-welder/ https://georgehobby.wordpress.com/2018/01/27/maxweldv2/
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    What do you use for cell welding?

    I bought a Sunko 737 welder, and I used it to build a few packs, but it is not at all safe and reliable. It relies on a 20A fuse in the 13A plug (with a mains cable probably rated at 10A) and after every 30 or 40 welds, it will blow that 20A fuse. It can also only be used in houses that don't...
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    Charging pack to 41V experiment

    Up to 150 cycles now. Pack voltage 41.044V: Bank no. ) Voltage 1) 4.1029 2) 4.1016 3)...
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    Schottky Diode Parallel Pack Adaptor

    Just bought a couple of these: Looks like it is based on the 4357 ideal diode chip, driving a power MOSFET: https://www.analog.com/media/en/technical-documentation/data-sheets/4357fd.pdf I'll try it out and report back.
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    Attaching a Li battery to a controller

    Will the low voltage cut off of the controller designed for lead acid batteries be ok for lithium? I imagine that will be set for about 34 to 35 V so it shouldn't do any harm, but range may be lower than might be expected.
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    ok to drill 2 holes in frame?

    I wouldn't want to go drilling holes in the frame. Best solution I've found is to 3D print your own mounts:
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    Tongsheng TSDZ2 with generic KT controller

    Had a look on Endless Sphere and there was this link about an external controller on this Italian forum: http://www.jobike.it/forum/topic.asp?TOPIC_ID=75861 So it seems possible. I wonder how well it ran.
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    Tongsheng TSDZ2 with generic KT controller

    I was wondering, has anyone ever tried controlling a TSDZ2 not with the stock controller, but a generic off the shelf 15A controller? Can it be done?
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    Rear hub motor recommendations for cycle courier bike

    Last week I sent an email to Bonnie to ask about Xiongda CST motors. Sadly, the company has decided to no longer sell to individual buyers :( Minimum order size is now 100 units. Any other options?
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    Genius, mad man, or common sense? Chain lubrication

    I am inclined to agree with you, but having hub gears means you then have to go mid drive or front drive.
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    Genius, mad man, or common sense? Chain lubrication

    Just so long as you've got the labels all pointing the same way you'll be fine... ;) With chains I think you have to be a bit pragmatic about it. It's the hardest working bit of your bike and once exposed to the elements, they don't last. Chains are so cheap now, if you ride a lot it's best...