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  1. joe tomten

    lifepo4 cell group reverses voltage?

    Just hauled out one of my bikes that has a 12s lifepo4 battery connected to a signal lab bms (red blinkey led type). The first cell group is MINUS 1.5v, and all the others around Positive 3.2 - 3.3 v. how can this happen?
  2. joe tomten

    grunting at start - lyen sensorless

    I have a lyen 6 fet mini monster sensorless controller that I've been using for over a year . As of yesterday it has starting grunting and hammering the motor on start up, but once up to speed a bit - is still working fine. I've checked all the connections and they are good. Any ideas on...
  3. joe tomten

    Tadpole pickup - "15hp" Hub or other??

    My friend wants to build a tadpole configured pickup/utility vehicle for his solar business. He has asked me what i thought about a specfic AC drive from Evergreen drive systems. a quote for a CFR AM200 motor, Curtis 1238 controller, the programmer, and all the assorted bits and pieces...
  4. joe tomten

    Frame bashing - 24" minimundo

    Here's a 24" wheeled steel Huffy 'meltdown' that I'm going to modify into a smallish longtail. It has the same headtube and seattube angles as the yuba mundo, and since I've been wanting to try out that bike - I figured it would be fun to copy it. And while I've been wanting to mess with...
  5. joe tomten

    Any one heard from Papa lately?

    Diggin though some of the archives i found some posts by Papa. Any one heard from him lately? http://endless-sphere.com/forums/viewtopic.php?f=1&t=10046&start=15#p156966
  6. joe tomten

    Isolation and Dc-dc converters

    Occasionally I have a battery pack with a lazy cell group, and I'm riding along and hit the LowVoltCutout and then have to hobble home, even though the pack still has plenty of charge in all but one of the 16 cells (lifepo4 in this case). "1,500 Vdc isolation, input to output" is claimed by...
  7. joe tomten

    Testing a lifepo4 battery

    I finally got my Cycle Analyst (CA) to talk to my computer through the serial port, so I am now ready to conduct the meaty part of the review that I started here: http://endless-sphere.com/forums/viewtopic.php?f=4&t=27932 At Justin's recommendation I've obtained several 250-500 watt power...
  8. joe tomten

    Keling lifepo4 48v15ahr battery

    I purchased this battery in order to do a conversion on my friends bike. He’s an avid cyclist/bike commuter, who wants his mtn. bike converted so he can pull his kid around on a tag-along on occasion. He wants a bike that works, and has little tolerance for messing around with a complex...
  9. joe tomten

    dc-dc converter as an aux. pack charger?

    Today I added an auxiliary pack in series with my 16s 15ahr ping. It is 4s ~16ahr, and brings me up to a 20s pack. Big fun. I was wondering if i could use one of the lyen dc-dc converters (http://endless-sphere.com/forums/viewtopic.php?f=31&t=21459) to let me do an opportunity bulk charge of...
  10. joe tomten

    How about those Molex microfit connectors?

    I just received a number of the SMD LVC boards of the tppacks design from Geoff57 has developed. Li-fe varient. So now I want to connect it to cell logs for diagnosis and to a cell-level balance charger, and I'm interested in trying out the molex microfit 3.0(mm) connectors for a more robust...
  11. joe tomten

    ping signallab on a generic cyldrical lifepo pack

    I'm considering putting a signallab2.5 from ping onto a couple of 16s packs of cylindrical lifepo4 cells. the ping I have charges to nearly 60 volts (3.75v/cell) for the prismatic pouches, whereas the lifepo4 chargers i see elsewhere are limited to like 58.4volts(3.65v/cell). What is the...
  12. joe tomten

    elect. rider yesa lifepo4 yard sale batt.s

    Was wondering if anyone have given these lifepo4's from Yesa much consideration. http://www.electricrider.com/yardsale/index.htm I havn't seen them discussed here (though i easily could have missed it). i need to expand my battery stable and can't spend a whole pile of cash doing so.
  13. joe tomten

    x406-409 rewiring; combine both winding sets together?

    I guess you need to check the axle nuts on occasion. On my rear wheel crystallyte hub the left nut loosened and the axle spun, and went and shorted the leads. Never had that happen on any of my bikes. So now that I need to open up the hub and rewire it. I've never really used the "high...
  14. joe tomten

    Shorted windings xlyte: Cogging newly occuring in funct

    The grinding growling problem incorrectly termed "Cogging" and incorrectly blamed on the controller here: http://endless-sphere.com/forums/viewtopic.php?f=2&t=11843 Turns out to be a winding short circuit failure - of both sets of windings the in the (misidentified above) xlyte 406/408 hub...
  15. joe tomten

    Cogging newly occuring in functioning setup

    I'm running a Crystallyte 408/411 setup with a pedal to start controller. The controller (36-72v 20amp, power by a 48v nom ping 15ah) is a practically new replacement from ebikes.ca, maybe a month old now. Up till the other day the system ran nicely, but I just started noticing a couple of...
  16. joe tomten

    FET's measure ~110 kOhm - controller troubleshoot continued

    I measured the FET resistances to see if I had any shorted ones last night and all six of them measure in the 100 to 120 kOhm range. Not the 1.x MegaOhm range shown in Fectors troubleshooting101 pictures**. Doesn't seem like a short circuit anywhere (well, to this Noob anyway). **...
  17. joe tomten

    troubleshooting 36-72v, dual speed hub xlyte

    Hello, I have a pedal first 36-72v, 20amp dual speed hub xlyte controller setup (V1 i think) on my bike. It has stopped working and I've been cruising the site trying to figure how to diagnose it. The most i get out of it is a little grunt, and then nothing. I've begun reading the tech stuff...
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