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  1. T

    left-side chainstay motor mount drive, cog->spokes attachment

    This is an example kit from amazon, $103 presently https://www.amazon.com/gp/product/B07H5FFJ53/ref=ox_sc_act_title_1
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    left-side chainstay motor mount drive, cog->spokes attachment

    Micah posted this video recently (below) on the $182 conversion - I'm trying to find some more discussion on this type of motor kit, eg. max speeds (reduction in the gear transmission), reliability, etc. etc. Sorry if there's a thread elsewhere, tried to look a bit...
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    greenworks 40V battery circuit help?

    I'm trying to make a battery to replace a Greenworks 40V battery. I've searched a lot. There are 4 connections from the battery : + , - , C , and Ohm (Omega). +,- are as thought. C appears to ground to - when the tool is operating. Ohm reads ~2.6V when tool is operating. The resistance on it...
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    Greenworks 40v G-MAX disassembled- 11C rating?

    Anyone figured out how to simulate what the 3/4th terminal of the battery is doing? eg, if wanting to make my own greenworks battery for one of their adapters? What was the diode doing mentioned above?
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    help to understand the Grin motor simulator curve

    I'm having trouble following the curve, the one attached has default-ish values populated after simulation. As you move toward faster speeds, eg. past 32.7kph as the vertical line indicates, the power (red) begins to decrease. Why is that? It would seem to imply that going faster past this...
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I'm sorry to ask a dumb question, have read through many of the pages: but is the highest power opensource compatible controller either this (psw : SKU:KT36/48SVPR-20A ) http://www.pswpower.com/ven.php?cargo.2016-3f-33c0 or (bms battery : s12s 500w)...
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    sources for 20" rear wheel disc brake DD motor

    Am having a hard time finding a source for these -- have seen the leafbike option (link below), but shipping is almost half purchase price. All the others are laced to a fat tire rim. Is there an ebay / amazon seller in the US? Are there significant quality differences between what's out...
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    mean well rpb-1600, programmable charger ~1600w

    Searched quickly, a programmable charger doing up to 58.8V / 28 A , controllable via PMbus , CC / CA. pdf spec sheet https://www.meanwellaustralia.com.au/file/11733/download?token=u4GTTiS- product page: https://www.meanwellaustralia.com.au/products/rpb-1600 ~$300 in the USA. About 3x...
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    Plausible to build custom variable voltage Lion charger?

    Someone has figured out the communication protocol, no need to buy Mean Wells programmer interface. https://github.com/Zweikeks/meanwell-enc-series-chargelog from http://www.irv2.com/forums/f54/program-and-monitor-mean-well-enc-series-of-battery-chargers-e-g-enc-120-12-a-342716.html Very...
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    What is the "Light Weight" go to "Hobby" Lithium packs

    Am curious for these types of packs -- how well are they maintaining their balance when used this way? What is the estimated lifetime of these types of packs - same as modern 18650 cells? Nice seeing a reasonable option, thanks for sharing.
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    This is a very interesting project, I can see you've done a lot of work here. Are you concerned that you won't have a platform for using it if BMSBattery stops selling this? Or if you've gotten the schematic well documented, maybe invite someone else to produce the hardware so there's no...
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    S12S Sine Wave Controller

    Curious if there's a source for these with less expensive shipping ($35 to USA). Shipping is same price as controller!! I'm interested in buying one to experiment with casainho's open source firmware. Any followups (bad) news from those that have been using this for a few years now? Thanks.
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    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Could you make a quick recommendation for helping with the project : I have a 48V standard "9c" type wheel - what controller would you suggest that would work with your firmware/development, that's around 1000 W or less. Several of the controllers seem to be in the low watt range, I'm more...
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    Testing the HP ESP-135 Server supply and isolation modding.

    I've read thru this and other threads talking about stacking several 12V power supplies in series, and then adding a lab type power supply that's current limited. I'm not sure I understand this really well -- the lab supply functions as the constant current part that will do the transition to...
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    Normal 48V cell # equivalent for LiFePO4

    Curious for others that have built their own packs, if you'd opted for 15s, 16s, or higher ?? for DIY'ing your own packs with LiFePO4 cells. It seems their discharge curves flatten more around 3.2V than their charging 3.6'ish V rating -- making you want to add another series group or three, to...
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    Plausible to build custom variable voltage Lion charger?

    I think you'd use the relay to turn off the charger completely (it breaks the NC connection to be open when the under current condition works, or you'd cheat the charger to be on while setting it, and let it operate as it would then be in the non-under-current mode, and it would remove power to...
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    Plausible to build custom variable voltage Lion charger?

    These are available stocked in the US for about $19 shipped, too, eg. https://www.ebay.com/itm/New-900W-DC-DC-Boost-Converter-8-60V-to-10-120V-15A-Step-Up-Power-Supply-Module/291861952982? This is a current detection board that could be used to force a cutoff when you get to C/10...
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    Toying with a cheap hoverboard BMS

    I've bought some of these packs, too, same as photoed above. One of the problems in these is that there is a single 8mmx0.15mm (or less?) strip of nickel carrying the series current in several links along the 10s strings. Many others have posted that the most current this would be suitable for...
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    Received 150 NCR18650GA cells from Nkon to California USA

    Some cells actually need higher discharge rates to get the rated value, eg, Samsung 25R I think needed 10A discharge to get a higher capacity rating, instead of a simple 1C or less.
  20. T

    cheap 1s-8s buzzerAlarm : doesn't work for 7/8s

    Thanks @AW// exactly the issue. There must be a million out there like this.
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    cheap 1s-8s buzzerAlarm : doesn't work for 7/8s

    http://www.ebay.com/itm/RC-Lipo-Battery-Low-Voltage-Alarm-1S-8S-Buzzer-Indicator-Checker-Tester-LED-Best-/282397825614 Tried searching to see if similar reports, I bought a good handful of these from 3 different sellers, and each and every one does not properly measure cells 7s and 8s. With...
  22. T

    BMS: inexpensive programmable balance points?

    Seems great being able to double or quadruple battery packs by charging to 4.0 or 4.1V per cell group, but it seems almost all the normal (<$30) BMS'es out there don't balance unless going all the way to 4.2V -- and perhaps the bulk charging is not perfectly precise, and then a specific group...
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    Homemade Battery Packs

    Dear DrkAngle : Have you had good experience with the accuracy of both that current meter you're showing, and the "Smart Battery Meter" that you have ? i have tried some of the $1.25 1s-18s RC alarm buzzers, and they do not work well at all. Thank you.
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    problems with cheap DC DC boost supplies for charging?

    http://www.ebay.com/itm/600W-DC-DC-Solar-Power-Adjustable-Step-up-Boost-Voltage-Converter-Module-Board/112402911989 Have gotten one of these to charge a lithium pack, it´s a 600W 10-60V -> 12-80V boost converter. This seems like an ideal bulk charging solution, but I was watching it with the...
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    New "TSDZ2 Torque Sensor Central Motor"

    Thanks @eyeBye, How are you seeing those values? I'm got a watt meter that I use on a bike that shows instantaneous current/power values -- is that how you're seeing those (11 / 13 / 18); or are you estimating what the values should be, based on the motor ratings? Any comments on what the...
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