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  1. D

    bluetooth BMS?

    Did anyone have a Problem with the new Elephant App V3? Since i installed it, which asked me for a pin, the charge and discharge fets are disabled and cant be enabled. I can hear some sort of ticking or cklicking from the bms. The BMS effectively doesnt work anymore. Does anybody know why?
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    Bluetooth DC energy monitor

    Awesome project, I think lots of people are looking for BL power meters! Great work you're doing here :bolt:
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    Which cell for long lasting battery

    Thanks for the input, I still have some headways laying around! But there to heavy for me :mrgreen:
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    Which cell for long lasting battery

    Thanks for the info! Can you specify your charge and discharge method, like Voltage, waiting time and so on. What cell would you recommend to me, it doesn't need to be super high energy. I'm only concerned about longevity under relatively mild conditions. I think about the Sanyo GA or Sam. 35E...
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    Which cell for long lasting battery

    A rough measure always was that I could ride to work, which are 52km total and another 15km until it was empty. As time passed I could barely go to work, so I had to reduce the speed on my way home. And it's getting worse and worse. First measurements took place with a resistive load and a...
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    Which cell for long lasting battery

    What do you mean with termination profile? I think you should be able to trust a manufacturers datasheet, right?
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    Which cell for long lasting battery

    I just found something interesting while digging around: Its about the Sammy 35E cell but anyway really suspicious or strange: From this datasheethttp://downloads.cdn.re-in.de/1400000-1499999/001499572-da-01-de-SAMSUNG_LI_ION_AKKU_18650__3500MAH_10A.pdf Thats the cycle life stats: So you can...
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    Which cell for long lasting battery

    I tought that too at my first design phase for the battery. But I'm limited to the triangle size of my bike. Which just fits about 91 cells plus the controller. So i have to stay high energy density cells, since I can't charge at work.
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    Which cell for long lasting battery

    Hey guys, at the moment i have a 7P13S battery consisting of 91 LG MG1 and after only about 170 cycles it lost already about 40%. I tested it multiple times and its quite disappointing. My setup looks like following: Charge overnight with about 3A or 0,3C. Commuting to work and back, each...
  10. D

    CHEAP NEW ORIGINAL 18650 21700 BATTERY CELLS, POUCHES AND PACKS

    I also ordered 140x Sanyo GAs for a project, everything went flawless. Including very good packaging. Big thumps up for your good service and good prices!
  11. D

    CHEAP NEW ORIGINAL 18650 21700 BATTERY CELLS, POUCHES AND PACKS

    I need to say some good words on tumich. I ordered multiple times from him, everyting went so easy, it couldn't be better. This time i got the cells within 72h !!! Really great service.
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    Which rear-geared-drive for bike that has 8 rear speeds?

    I've read the whole thread but i'm not sure about the motor windings. Does the 36V 201 and the 48V 201 have the same torque output? If yes i would run the 36V at 48V battery for more speed and torque
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    Super Commuter: 6T MAC 48V/120A Kelly in a 26" rim

    Very fine build ! 8) I also live in Germany and asked myself if you are not scared to ride in cities with such a bike. You know its not legal without a license :lol: ? What's your plan if the cops stop you?
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    Moonshine's Vector/MXUS/MaxE Build

    I'm also going to build a vector, and saw the chainline problem. So you use a multi speed freewheel and a chain tensioner, how do you secure the chain so it doesn't change gear itself? BTW very nice build 8)
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    Zero MX 2012 Battery Build

    Thank you all, helped very much :)
  16. D

    Turnigy multistar vs. Samsung 25R

    I just want to add a little story from me I'm an electronics engineer and 2 years ago i started to build my first ebike. At that time i didn't had too much knowledge about batteries, but i knew i want 18650 since they seemed to be way more safe. Lifepo wasn't a choice for me since its really...
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    Zero MX without battery

    Hey guys, i want to build a new battery for a zero mx and need to by a zero mx without a battery. But i really jas everything else like agni an alltrax and such. My question is how much should i pay for it on a european market. Thanks :)
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    STP 75NF20 false alarm. it has 28mohm Rdson

    These fets are not 2.8mOhm but 28mOhm according to the official ST datasheet! :O
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    Can hk lipo be beaten for this application?

    Wiht 18650 i mean, powerful cells like the Samsung 25R or the Sony VTCs with really low IR. They are way lighter than lipo,have bettery cycle life, are safe and just a tad more expensive. But if you really want high power, you only have the LiPo choice with 130C peak cells. But that amount of...
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    Zero MX 2012 Battery Build

    The 550A are just peak for max. 10 sec. Continuously the controller only draws 200A which are about 12A per cell, so no problem about that. But if i can i will reduce peak to 500Aor 450A 35P would be to heavy and expensive
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    Can hk lipo be beaten for this application?

    The first three are not LifePO but Lithium Ion with NCA Kathode from Samsung. But the 29E is way to weak. You need at least 6C if you only want a 1kWh pack. My suggestion would be using 18650 cells, because any kind of LiPo pouch is very sensitive and the HK is just bad quality and overrated...
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    Zero MX 2012 Battery Build

    Thank you very much guys, my plan is to use Samsung 25R in 18S18P configuration. I'm going to charge to 4.1V or 74V, internal resistance of the whole battery pack should be less than 25mOhm ! Can i really put 550A peak at 72V into the Agni of the MX ? That sounds really high to me, i might...
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    Zero MX 2012 Battery Build

    I'm aware of all that, since i study electronic engineering. But in cant find any information about the battery wich is labeled as ZF3. I only know they use 14 cells and the nominal capacity is 3kWh. Also are they using the Agni 95 or a Perm Motor, no idea. I would any information really...
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    Zero MX 2012 Battery Build

    Hey guys, i have a Zero MX 2012 without a battery.So i need to build a battery for it. Does anybody know how much Ah they have. I figured out it has 14 cells in series. But dont know the exact Ah but at 3kWh it would be around 60Ah Also very important, how much Amperes does the BMS draw from the...
  25. D

    BIG BLOCK alternative Motor

    So were can i get cheap sprockets for 420 chain ?
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