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  1. D

    PHEV battery pack for DIY storage?

    Hello my friends, looking for some advice on a DIY energy storage project up to 20kWh (as close to) I've been looking to build an energy storage project for years, now I have some time. I have built ebike battery packs, and am working on 800V packs for work, so I have some idea how to keep...
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    70V-ish PSU advice

    Hi all, I'm looking for a AC mains to DC power supply of about 70V (min 66V) to power a 360W FRNSI DC6006L adjustable PSU. I'm not sure what is the maximum it can take, need to open it up, but spec says 70V. I have to assume it has 80V caps, but I'll check. After googling, ebay and alibaba...
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    New battery pack - sourcing question in the UK

    Hi all, I have a somewhat obscure question. Turns out due to Bxit, starting in 2021 when buying stuff from the continent, we need to pay VAT. I have purchased previously battery cells only from nkon.nl, and had very good experience with good quality cells, reasonably fast shipping and very good...
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    Sensorless Q128 cutting on high grade low speed - S09S

    Hi all, as the title says, I have a bit of an issue with my new setup. It's my first time using the S09S sensorless controller. Motor is a Q128 36V and 201RPM winding on a (for now) 24V battery. Top speed is a bit low as you would imagine, but the battery is capable of 7-800W in a pinch. I...
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    Battery not fully charging - ideas?

    nevermind, please delete
  6. D

    Strange ebike shutdown

    Hi all, I was wondering what your thoughts are about this fault. The ebike electrics have ran since 2014 just fine, with no issues outside of dodgy connectors that had to be swapped along the way. Some data: *Battery 14S5P Samsung 22F 2.2Ah cells (state of the art in 2013 :shock: ) *Infineon...
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    Slim handlebar throttle advice

    Hi all, I'm looking to de-clutter my handlebars. For a few years I used a half twist throttle, but I replaced it with a thumb throttle which was slimmer. Having used it for 2 years now, I find the thumb throttle quite tiring on my thumb and wrist on a 1+ hour ride (tried two brands, same...
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    Wiring harness ideas

    Hi all, I'd very much appreciate some direction. Here's the problem: my ebike, based on an em3ev kit with infineon 9-fet and 9C motor, has just turned 5. It's been 4 good years in which I commuted and ridden for thousands of miles. This year, it has been a bit dodgy and I'm taking advantage of...
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    BMSbattery S06S wiring help and S-LCD5 setup

    Hello team, I need a hand. It looks like I'm so close to having this setup working, but not quite. I have - Q100H, S06S, S-LCD5, a throttle and a PAS sensor powered by a 24V battery. What works - everything except the PAS assistance. I tried following the wiring diagram linked on the website...
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    Low voltage cutoff on BMSbattery controllers

    Hello, I wonder what the LVC values may be on the two controller bellow and if it ts adjustable: S06s: https://bmsbattery.com/ebike-kit/546-s06s-250w-torque-simulation-sine-wave-controller-ebike-kit.html S09s...
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    Controller with torque control capability - need some advice

    Hi all, I'm looking for a new controller. I have used for years em3ev's 9-FET Infineon 4110, but I haven't really searched for a controller since 2012, maybe you can help me. There are a few features that I like on the Infineon 4110 as it's not just a dumb DC-AC converter. Here's a very short...
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    First tesdrive custom battery pack

    Hey, I just went out for a test drive of my new pack. It's in a very "alpha" stage, basically just 12 cells and some conectors. The pack will be a 15s1p of LG HG2. For now it contains just 10 HG2s and 2 Samsung 25R I have around the house. The connectors work, it powers the bike at about 100W...
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    Precharge resistor required for 63V connection?

    Hi guys, help me out with a sanity check. I'm building a 15s1p LG HG2 battery pack and I wonder if I need a pre-charge circuit. My back of the napkin calculations with 63V max and 0.3Ohm (20mOhm per cell) gives an inrush current of 210A. I am obviously neglecting a few contact resistance mOhms...
  14. D

    New LG HG2 custom battery pack - need advice on BMS/charger

    Hello ebiker world In the last few monts at work I tested many many batteries and once the cells finihed the testing programme, my boss was happy enough to give them to me. I want to build a 15s1p LG HG2 pack, but obvioulsy aside from the cells I need a few other bits. I need some suggestions...
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    Q100 - Q100H - Q100C - what is the difference?

    Hi guys, I'm looking to buy a stealthy commuter bike and I'm looking at the Cute motors over at BMSBattery, but I am confused what is the difference between them. It doesn't help that some have drawings attached, some have power curves, but not all have both; bottom line is I find it hard to...
  16. D

    Need advice - a good 250W-ish 24V motor

    Hi, I'm going now for a second ebike project. My better half, having seen the light, decided she wants an ebike too. I already have a 24V battery in a pretty good condition, Samsung 22F cells with a nominal 8Ah of total pack capacity. I'm hopeful this would be good for 30km/19miles of mild...
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    25-40kW peak Electric Motor

    Hi guys, I'm thinking of the possibility of modifying an existing vehicle to have it electric. I don't need a lot of power, the idea would be more that I want to prove that I can do it. Now, although I don't really know what I want to do, I've done some computations and think I might need a...
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    250-350W rear hub motor advice?

    The title pretty much says it all, I need a motor for an ebike. It should be a small one in the max 350W on 24V (or 36V but will be used on 24). If possible I'd like to have it below 150$/€; if money were no object I could just get the Mac from Paul @em3ev for 250€. What do you think, is it...
  19. D

    Advice on two batteries from bmsbattery

    Hi, I'm refurbishing a bike for a friend and it needs a new battery. For some background info the bike is a cheapo 24V European bike which came with a low capacity lead battery - the battery dies, it includes the controller, both need to go. I already have an open loop (sensorless)...
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    Advice on debugging electric motor fault

    Hi, I'm relaying this question from a firend. He asked me, I gave my 2 cents, but maybe there's more to it. Here's the problem: about 5% of a type of motor consistenly have one phase hotter than the other two when under normal load. We have put sample motors in an oven to heat them at the same...
  21. D

    Twist throttle, hall type, advice on how to fix them

    Hi, today I (with some help) managed to brake my second half-twist throttle. It's an em3ev model, lovely feel, the one that has the 3-speed infineon switch and cruise. http://em3ev.com/store/index.php?route=product/product&path=41&product_id=91 Both have broken in the same way and I think it's...
  22. D

    Custom length spokes - how do you do it?

    I'd like to plan for a trip with the ebike some time next year. For this I'd like to have some spare spokes. My setup: EM3EV DD 500W motor (similar to 9C if not identical) on an Alex Rims 26" uhhh rim. The spokes as shipped by cell_man are 17cm (6.7"). I'd like to buy a few spares, so I...
  23. D

    Regen and the Infineon EB3xx controller

    Hi, I'm looking for some information about regen with my EM3EV Infineon controller. I looking for some safe settings to dial in the software to protect the battery: not overcharge, overvolt or charge at too high of a current. The setup is a 50V NMC battery (I think 100%SOC @58.3V), EB309...
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    EM3EV DD 500W Kit - 50km

    Hey, this are my first impressions on a EM3EV kit after 3 weeks of usage. First of all here's what I bought: *50V 12.3Ah Samsung Triangle Pack *500W Direct Drive Kit - 26" Wheel - Rear motor 305rpm (244rpm loaded) @36V - Controller Type 9FET 30A w/EB3 Program Cable *add to this spare...
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    Low cogging torque / drag motor advice

    I just can't stop making new threads :D but I have so many questions. As I said in other posts I am trying to design a light weight high range ebike to help me to ride just that little bit faster on long trips. The power needed is quite low, 200W DC or less continuous, so 4 amps DC for a 48V...
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