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  1. O

    YesCom 48v noisy hub

    Perfect - Many Thanks!
  2. O

    YesCom 48v noisy hub

    Yes, same sound at same volume when coasting. But no wonky sound when not under load (my weight - 200 pounds).
  3. O

    YesCom 48v noisy hub

    Hi all :) Thank you for all the advice and help you've all provided. I have a question .. I'm hoping somebody here will be familiar with this issue. I have a YesComUSA 1000 watt rear install. The hub is increasingly noisy. I though a few spokes might be loose so I maintenanced them. But...
  4. O

    Bulk Charging ...

    I cracked open the case - here's a picture: Just as I thought - this brought no insight into what happened or how to fix this one power supply. However, the 450V capacitor looks scary. I bet that sucker is holding charge - Yikes! :shock: I think I bought myself an $8 eighteen inch piece...
  5. O

    Bulk Charging ...

    I went to my local electronics store. The guy there said he thinks the battery was drawing to many amps. I've got a power analyzer ... I wish I'd thought to hook that up so as to monitor the amperage. I guess I could hook it up on another one just to see and unplug it within 30 seconds. He...
  6. O

    Bulk Charging ...

    Here are the safety features advertised: Is it possible the battery was sucking down energy at a rate greater than 6a? It was only connected for less than 2 minutes and after initial connection and the voltage settled it seemed to increase cell voltage at a quick rate. The power supply was...
  7. O

    Bulk Charging ...

    The power supply fail is a reason? What is that the reason for? I thought fuses protect against power surges. I don't see how a surge may have occurred - what surged? The AC or my battery? I think what likely happened is the power supply detected sustained and building push-back from the...
  8. O

    Bulk Charging ...

    Sadness ensues :( I put andersons on my third power supply and decided to bulk charge one of my 3 cell zippy 8ah lipos. It started at 3.81v, 3.82v, and 3.83v. When I connected the charger which tested at 12.45v, the cells jumped to 3.85v, 3.86v, and 3.86v. It charged for about two minutes...
  9. O

    Bulk Charging ...

    I think there's just more than one way to skin a cat. And we all skin cats from within our comfort level and do it the way we want to. I don't know what's best. I know there are lengthy BMS vs no BMS debates here. Part of what I enjoy is being the BMS and my e-bike is for pleasure only. I...
  10. O

    Bulk Charging ...

    Thanks. I think of fuses as surge protectors. I'm not sure what fuses would be protecting against in this situation. I know I'm just a numbskull with regard to this - fuses probably serve a multitude of functions. I could see installing something that ensure electricity flows in one...
  11. O

    Bulk Charging ...

    Sort of a plea for input I think everyone here enjoys being helpful - and that's always a two way street - you just never know what somebody's going to think of. I also think it's natural for us to point out problems others haven't thought of. It's just human nature for some reason - I do it...
  12. O

    Bulk Charging ...

    Thanks cal3thousand ... That's what I'll do ... I've done one so far :) No rush here. dnmun ... that's a good question. No, I didn't think about it until now. Can that be simulated by simply unplugging one of power supplies during charge? I think the charge process would just halt? I...
  13. O

    Bulk Charging ...

    Power supplies in hand :) They're kind of smaller than I expected ... but that's good with regard to carrying them with me on the bike. I have a watt meter. I've only tested one. It draws 0.4 watts just plugged in with no load :(. Here's a pic of my volt meter testing the voltage: 12.62...
  14. O

    Bulk Charging ...

    I decided on 5 of these: http://www.amazon.com/gp/product/B003TUMDWG/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1 Don't have to worry about one switching off as they're just always on. I'm also having fun with LED lights around the house - so these actually serve an additional purpose. That's...
  15. O

    Bulk Charging ...

    Thanks for the replies! Thanks dmnum. It was silly of me to use approximate numbers for voltage. 2 of the power supplies are 19.5V @ ~4.5 amps and the other is 20V @ ~3.3 amps. I think what I could expect from that is 59V @ ~3.3 amps. But like you alluded to - there are things I just don't...
  16. O

    Bulk Charging ...

    Thanks TJ! Wow - that seems like a really good price for a 60V power supply. I may have to pick one up just because! I'll series the laptop power supplies I have and see what happens ... seems like it will work ... I hope any of the three don't switch off by itself. Riding up to your place...
  17. O

    Bulk Charging ...

    Thanks Ykick. My understanding of IR is that when IR of a particular cell is high that cells voltage will go up quicker - so that cell must be monitored even more than other cells. I like this bulk charger because I can actually carry it with the bike. My range with my 15S2P is about 35...
  18. O

    Bulk Charging ...

    No BMS. I just do it manually. I have a volt meter on my bike. Until now, or after I put this bulk charger together, I balance charge every time I charge. I prefer to not let my resting voltage drop below 54V (3.6v per cell) before I recharge. I always store my batts at 3.85V per cell. I...
  19. O

    Bulk Charging ...

    Hello ... long time ... cheers everyone :) I have 3 old laptop power supplies. Each one is approximately ~20V and they range in amps from 4 to 6. I'm thinking to cut the cord to the laptop connector and wire them in series. This would give me ~60V at ~5amps I think?? I run 15 cell lipo for...
  20. O

    ZIPPY Flightmax 8000mAh 6S1P 30C - HK.. YAY

    I think this thread will help with the charger: http://endless-sphere.com/forums/viewtopic.php?f=14&t=50546 I think the power supply is a meanwell 12volt 500watt power supply. I hope that helps ... If others chime in - these guys really know they're shite! I just wanted to respond because I...
  21. O

    Over Volt a Hand Held Vacuum?

    Could I put a 80watt 12v light bulb inline as my resistor and heat sink all in one? I don't know if a 80watt 12v light bulb exists. Is this a good idea? I don't think I need to be precise with the voltage drop I seek ... I want to target 7.5v-8v. Any drop in voltage between 5v and 9v I would...
  22. O

    Over Volt a Hand Held Vacuum?

    Can I put a resistor inline? I think the vacuum draws constant amps. So the voltage drop would be constant. I think I want an 8 volt drop. I think the vacuum draws 10 amps (but I'm not sure - that estimate could be way off). Assuming it does draw 10 amps would I need a .8ohm resistor to get...
  23. O

    Over Volt a Hand Held Vacuum?

    Hi, Kind of a screwy question but I can't find information on the web and this is likely a place where I can find good information. I bought a 12 volt hand held vacuum for my car. I cut the power cord, put some anderson power poles on and hooked it up to a 3 cell Zippy 8ah battery. Works...
  24. O

    LiPos, 300 cycles?

    ummmmm ..... Well Played Sir! :)
  25. O

    yescomusa 48V 1KW rear kit - Cruise Control & Regen Braking

    No, I opted to not pursue regen braking. My thoughts were as follows: I installed a torque arm. The torque arm helps keep the axle in place so as to not damage the drop outs and/or spin and ruin the wiring of the motorized hub. The torque managed by the torque arm is in one direction. Regen...
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