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  1. T

    BBSHD + Grin Phaserunner (52V okay, 72V problem)

    Hi - I'm working on an external controller mod for one of my BBSHDs using a V2 Grin Phaserunner. Goal is to run 72V (20S) at 40A with smooth/ramped acceleration from a stop to minimize stresses. I made my own JST adapter cable for the hall sensors and motor temp sensor and added 10AWG phase...
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    Fastest Charging 18650?

    Does anyone know which 18650 currently has the fastest charging capability? Samsung 30Q datasheet lists a "rapid charge" as 4A.
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    Powering 5V rear light from BBSHD shift sensor cable?

    Does anyone know if you can safely draw <500mA of current from the 5V line of the BBSHD shift sensor cable? If this line is common with the display 5V supply, I suspect it may support 500mA since the DPC14 has a USB power port (assuming nothing plugged into this port simultaneously). I'm hoping...
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    Solar Charging - DC-DC Buck/Boost

    My current home solar charging setup involves 2 100W solar panels in series fed to a MPT-7210A charge controller which charges a 2 kWh 14S 18650 pack (with BMS) during the day. My bike also uses 14S packs, but I use new high power cells on the bike, and salvaged laptop cells for the solar bank...
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    Spot Welding to a Neodymium Magnet?

    Has anyone ever tried to spot weld nickel strip to a neodymium magnet? Does it work? Is it dangerous or damaging for any reason? I'm worried the high current might have some magnetic interaction. Basically, I'd like to make some low-current magnetic charging leads by putting nickel solder tabs...
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    DIY 52V Jumbo Shark/ Hailong-3 Packs

    Hi everyone - I recently bought 2 Hailong-3 cases from AliExpress and 70 cells each of Samsung 30Q and Sony VTC5A from nkon.nl. I'd like to make my own 52V (14S5P) packs with them. I have a spot welder and pure nickel strip, but I'm not quite sure what cell layout to use. I know lunacycle...
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    Best hub motor for bike generator?

    Well, it's dark and cold in NY again and I'm barely riding my road bike. I normally ride a trainer in the winter to stay somewhat fit, but this year I'm thinking about putting a rear hub motor on my trainer bike and pedaling against regen for my workout (still mounted on a trainer). I fully...
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    Anyone know more about this?

    http://qz.com/433131/the-story-of-the-invention-that-could-revolutionize-batteries-and-maybe-american-manufacturing-as-well/
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    My First BBS02 Build

    This is my 2nd E-bike (1st was an eBay 1000W DD Hub) and my first BBS02. I built it entirely from parts purchased online. I am very impressed with the bike so far - it is nearly silent, can climb any hill I've tried to ride it up (10-15% grades), and still can hit about 28 mph. I haven't had any...
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    ES BBSxx Sticker

    Hi ES - I'm doing a BBS02 build over the next few weeks and while I am a huge fan of Luna Cycle, I'm honestly not a huge fan of their logo. So, I decided I want to put something over it on the motor and then I thought of this...
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    Fasttech issued me a refund?

    Back in January I ordered 21 4-packs of Sanyo NCR18650BF cells from fasttech.com. They shipped as 3 packages of 7 4-packs. 2 of the 3 packages have since arrived and a capacity test on each cell indicated they are genuine. This morning, I got an e-mail from Paypal that said "FastTech.com just...
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    Cell-level Fusing

    Hi ES, I've been in the process of building five 14S8P 18650 packs over the last few months (whenever I have time) and it's made me think a bit about fusing. This video by 15-sec-of Fame https://youtu.be/5EE4TsuzD_Q convinced me to build one pack using PTC fuses (4A) at the cell level. The...
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    BBSHD on a Giant Seek 1?

    I'm about to buy a Giant Seek 1 (2016) to use as a pedal commuter with the intent to convert it to electric in the future. It has a Shimano Alfine 8-speed IGH and uses an eccentric bottom bracket for chain tensioning. Does anyone know if it is possible to install a BBSHD on an eccentric bottom...
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    Cycle Satiator Question

    Anyone know if the Cycle Satiator (24-48V) can run on DC? As in 60-80V DC through the normal AC input? Or will something inside not like it...? I emailed Grin, but haven't heard back yet (1-2 days since I sent it) so I figured I'd ask here. I'd like to use it on the output of a DC-DC boost...
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    Fire Safety with Lithium Batteries

    Hi ES, I came across this article that I think gives a good overview of fire safety for lithium batteries and thought I'd share it (we should all have this knowledge and practice our craft with safety in mind)...
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    Re-celling of Porter Cable 18V Batteries

    A friend at work gave me two dead Porter Cable 18V lithium batteries to work on since he knows I have built battery packs for my bike. I had spare high discharge cells (Samsung 20Q, LG HG2), so I decided to try re-celling the packs for him. Each pack is 5 cells in series with a BMS. For the...
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    Gearbest Experience

    Hi ES, I thought I would share my recent experience ordering 18650 cells from gearbest.com so others can benefit from it. I ordered 28 LG HE4's on 02-11-2016 and they just arrived today 03-04-2016 (23 days later). These are 2500 mAh 20A discharge cells. I paid $3.65/cell with free shipping to...
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    Grinfineon 20A current limit?

    I have a Grinfineon C3620-NC controller (24-48V 20A) that I am using with a CA3. Does anyone know if I can set the current limit to, say, 21A using the CA3 and have it actually draw 21A? Or does the controller itself have a hard limit of 20A? If it is possible, is it relatively safe? I'm...
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    E-Bike Touring with BOB Trailers

    I'm scoping out a long distance e-bike trip this summer in New England and I was wondering if anyone here has used a BOB trailer to haul batteries? Basically, they sell the Yak and the Ibex (adds 3" suspension). I'm curious to hear about people's experiences hauling large amounts of batteries -...
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    Is higher voltage better for laptop 18650 packs?

    Hi everyone - I have a seemingly simple question, but I'm curious about the implications for the rest of the e-bike system. I have probably 800 or so 18650 cells recovered from discarded laptop packs that I have tested for capacity at 1A discharge using 5 Foxnovo 4S units (20 cells can test...
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    Hybrid 18650 Pack?

    I'm currently thinking about building a 14s8p pack from a combination of reclaimed laptop 18650 cells (capacity and IR tested/matched) and Samsung 20Q cells extracted from RYOBI One+ power tool batteries I recently bought at Home Depot (2-pack of 18v 4Ah for $99 - not bad). The plan is basically...
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    Foxnovo 4S

    Just wanted to share with everyone my latest purchase - 2 Foxnovo 4S battery capacity testers. I got these on eBay for about $33 USD per unit...
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    Making Balanced Capacity Packs with help from Python

    Hi ES, This is my first post on these forums. This July I did my first E-Bike build with a 2003 Trek 4500, an eBay 48v front hub motor kit, and recycled laptop 18650 cells. The bike has been great (commuted about 300 miles on it so far). I figured I would share with the community a little...
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