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  1. T

    New "TSDZ2 Torque Sensor Central Motor"

    Would someone using the 500w or 750w or 350w version care to give your "max current" obervations? Some other motor/controller combinations will say "500w", but for a few seconds will indeed pull almost twice that. A front hub I have easily gets into the 900watts when bogged down on a hill. Is...
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    dc dc cnverters, 12-80V -- where??

    Thanks for the replies; the question came from seeing a large range of headlights that are 12-80V compatible, that cost like $4 on ebay. So surely there must be a similar DC DC over that input range that could get down into the same ~5V output. I found a few low cost variants that cover the...
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    dc dc cnverters, 12-80V -- where??

    There is no shortage of $1-2 dc-dc converters for up to about 36V, ~10w total power output, but don't see many going at least to 60V, which gets into normal batteries that we're using on ebikes. Anyone know of some equivalents of these, with a slightly wide input voltage range? Just for...
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    Do I need a spacer between rear hub and freewheel? (+ pics)

    Thanks for responses; the other question I'm not so sure about either is if there should have been a larger sleeve that goes over the axle here; as it seems that any washer here (circled) is sitting on a very small shoulder to provide the resistance back against the inside of the dropout...
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    Do I need a spacer between rear hub and freewheel? (+ pics)

    Thanks @AW/ That's probably exactly the best solution. Just $15 shipping tho to USA. Gotta be a cheaper source of these things? Surely price per piece from China folks that include them with other kits is a dime or two. Ebay almost has nothing in this category.
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    basic question motor controllers -- max current

    @Al - so it sounds like the slow (average) current methods all depend on the peak instantaneous needs not getting chopped by the typical battery BMS, which also has a specification that's probably measuring in the same way that the cheap controller is. Any idea what typical motor instantaneous...
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    Do I need a spacer between rear hub and freewheel? (+ pics)

    Similar question -- on a 9c rear hub, the washer that sits on the shoulder (see photo, taken from ebikes.ca ad for 9c) -- the washer normally that would be compressed by the inside of the drive-side dropouts is not very secure here. It's not notched, so it's a real 14mm ID (for axle), which...
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    basic question motor controllers -- max current

    Thanks Alan/billvon; so this is the method (current measuring at FETs) used by even the cheap USD$20 chinese controllers that are hooked up to say 9c / Crystalite wheels? What are the sensors they're using to do that??
  9. T

    reasonably priced 0-60V power supply? ~10A or more

    There are a lot of 0-30V bench supples, 0-5A, 0-10A, but almost none for the higher voltage that are on multiples of the $30 price. CC/CV capable, similar to this 15A/60V that goes for $300. https://www.amazon.com/dp/B015QHVJR4/ Why are there so many buck/boost converters that are ~$10-20...
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    basic question motor controllers -- max current

    Sorry for basic question: I understand how the motor controllers, when they're rated for say 20A, will PWM the current coming from the battery pack to make an "average" current rating not to exceed the 20A. But if you're looking at the more instantaneous current demand : how is that being...
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    Good price battery supplier in USA. Don't order elsewhere

    @S - how long did they take to ship it out? Any idea when it'll be arriving? Thanks for report, nkons prices are really good.
  12. T

    Build your own charger

    Thanks for posting this, it's nice seeing what other folks are doing and what types of products they're inventing that may not already have a good off the shelf counterpart. Doing the current limiting resistors definitely means you're not doing a proper CC phase for the LiOns -- any thoughts on...
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    Bulk charging via digital DC-DC boost Minghe BST-900W

    Any suggestions for how to get this charger to cutoff at a specific low current rate? After the CC, CV, when the current under CV has dropped to C / 10? Someone had mentioned a low current dropoff circuit above, any one doing that? Thanks
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    My 1200W Charging Setup

    Does the manufacturer suggest these can be run in series? I looked on the HRP-300-24 data sheet and didn't see any mention of it. Thanks
  15. T

    bms (by definition) not allowing for low(er) voltage charge

    I've looked through a few functional diagrams for BMSs - it seems that if one desires to charge to 4.1V (on INR18650s), that it's basically impossible to ensure that the voltage spread will be correct. Further, if wishing that the proper CC/CV curve be followed, this definitely won't be...
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    kWeld - "Next level" DIY battery spot welder

    Hi Tatus - rather than the small hobbyking/LiPo packs, am curious what you think the suitability would be with these (now) very common "jump starter" packs that say rated up to 600 A at 12 V ? For instance...
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    JP spot-welder, FET-switched, timed adj. pulse

    Okashira / Flangefrog, Any idea what the residual energy is in the ad-hoc inductive circuit (after turning FETs off) that needs to be disippated by the TVS / Schottky ? With a normal car battery setup. I think the oscilloscope readings were all measured only across the FET s->d, in the well...
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