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  1. geoff57

    DIY bms

    I want to build my own Bms not rely on a Bms bought off the internet where I am not sure what is going on. I will brake the designing of thiss down into several sections LVC, HVC, balancing, forced balance and amp limit on both charge and discharge. I want to be able up to 20 cells in series...
  2. geoff57

    ISDN batterygo BG-8S

    I found this a while back on hobbyking it is unavailable at the moment but banggood and aliexpress both have them in stock. It has a battery balancing function available similar to the battery medic that has been out for years but it is a lot more accurate. It does not have a discharge and...
  3. geoff57

    Size of heat shrink tube to use

    It’s been a while since I last had to build a battery pack and have forgotten some of the things that make a pack look neat. I’m building the pack out of turnigy 5ah 5cell battery “bricks” to wire them up I need to remove the heat shrink to get at the cell tabs. To keep the whole pack looking...
  4. geoff57

    15s lipo/li ion with 48v controller

    I have a 48v controller that has 63v capacitors in it. Will a 15s lipo (max 63v) work with the controller? At the moment it has a 14s battery it came originally with a 13s battery. Changing the controller would not be impossible but would not be easy. Geoff
  5. geoff57

    Laptop PSU with 60v+battery packs

    Hi With a battery pack less than 60v there is no problem finding a dc converter to get a low voltage (12 or 5 v) output, once you go over 60v we run into problems. I mostly work with 20s lipo “72v” batteries, are laptop PSU’s still the best method to get a low voltage output from the battery...
  6. geoff57

    single cell or prebuilt pack

    hi I need to build yet another battery pack and want to check which is the best way to go. the pack will be a 72v 20ah LiPo pack it will be in the 20S 4P configuration using turnigy 20c 5ah cells. The BMS and charger are sorted. The problem I have is what cells do I use multi cell battery packs...
  7. geoff57

    BMS Vs LVC/HVC

    Hi I want to make up a battery pack that has some form of battery management on it but am not sure Which route to take, an off the shelf BMS or build a LVC/HVC setup with no balance capability’s. The circuit I could make would have a plug in display for visual reference of the cell voltage and...
  8. geoff57

    Arduino powered Speedometer

    Hi This has been done in the past but not for 5 years as far as I can find. I want to make a speedometer using an Arduino and one of the hall sensors from a sensored brushless motor. So far I have managed to solder a wire onto one of the hall pads inside the speed controller, when measured on a...
  9. geoff57

    Speed sensor output from a controller

    Hi I have a problem with a standard cycle computer and the sensor, try as I might I cannot get the sensor and magnet to work reliably. I’ve decided to use the speed output from the controller in the same way as a cycle analyst does, since the controller output is governed by the number of...
  10. geoff57

    Cruse control on ebikes

    Hi Ever since I started ridding ebikes seriously the idea of cruse control has come in and gon out of fashion. Most controllers have a rudimentary cruise control switch that freezes the voltage the controller gets from the throttle allowing you to stop turning the throttle, this could be...
  11. geoff57

    How to measure amps

    Hi I know that to measure the amps coming from a battery you put a shunt on the negative wire and take measurements from both sides of the shunt, calibrate it using a meter you know to be accurate and there you have it, I have used a cycle analyst before. My problem is what measurements do you...
  12. geoff57

    Converting a controller from 48v to 72v

    Hi I bought 2 48v electric scooters with a lot of security features that I would like to keep, I want to up the torque of them by changing from 48v(13sr li ion) to 72v (20s LiPo) is it possible to convert the controllers, in next few days I’ll get some picks of one of the controllers. Geoff
  13. geoff57

    Multiple battery packs on same cycle

    Hi I have a bike with a 20s 15Ah LiPo battery pack with a BMS as a primary battery pack it has a MCB as an isolator switch on the positive power cable from the battery, I have a cycle analyst to monitor the battery. I want to add more battery packs to increase range some of the same voltage some...
  14. geoff57

    Adding battery packs together

    Hi I have an electric moped with a 20s 15Ah base battery pack with a BMS, for long journeys I want to add extra packs to the bike there are several compartments in the bike that extra battery's could be put. I'm wondering what would be the best way to connect the packs together if at all, all...
  15. geoff57

    Wh/mile on the fly

    Hi I know that the Cycle Analist has a Wh/Mi in it that after about half a mile it gives the average Wh/Mi since the last reset, what I am looking for is a formula for working it out on the fly so to speak. The measurements I have avalible to me is M/h, W ,A, V , distance in miles and W/h. I...
  16. geoff57

    Electric scooter conversion

    While on holiday I saw an electric pedal scooter for sale in a mobility shop for £400, I had been looking for such a project for a long time I enquired within and they were willing to ship it to my house for the same price it was a bargain as a frame to work from befor shipping they let me use...
  17. geoff57

    Slow charging system that is reliable

    Hi This thread and the ideas in it will not be for everyone but will work for some. Although the zephyr has now arrived I have been working on a method of charging my LiPo's reliably, I did not need to charge them super fast as long as if put on to charge in the evening after ridding my bike I...
  18. geoff57

    SMD LVC project

    Hi this is a replacement for the micro LVC thread I have been posting in as the project has changed so as to not reflect the micro LVC name. Geoff
  19. geoff57

    Problems with the prolific usb to TTL chip

    Hi i have been using the prolific usb chip in a lead on both my XP and VISA computers for programming infineon and now the latest XC116 family of controllers i also supply the leads to some ebikers in the UK. The first thing I do when I get new stock of leads in is check them to make sure...
  20. geoff57

    Infineon transistor modification

    Hi The transistor modification has gone through several stages of evolution, starting with a combination of an ideal controller that Knuckles wanted and a circuit design to achieve that by Fechter. Original circuit diagram by Fechter The Darlington transistor in this was found to be overkill...
  21. geoff57

    Infineon controller programing information

    this is by way of a sister thread to the thread knuckles is doing on the infineon controller techecnical thread. This thread Is aimed at showing just what the infineon can do with the advanced options. tests are being done with a Puma motor under no load, when these tests are compleat I will...
  22. geoff57

    Cycle Analyst Rshunt setting/calibration

    Hi all There is no fualt in the Cycle Analyst let me get that straight first. This thread has been done due to the popularity of the CA and the fact there is nothing else like it out there. The Guys at Ebikes.ca do a great job the Direct Plugin Cycle Anlyst or DP CA, when you buy a controller...
  23. geoff57

    Cycle Analyst Rshunt setting/calibration feedback

    hi all this is the feed back thead to Cycle Analyst Rshunt setting/calibration in EVBasic
  24. geoff57

    we've got another wargamer

    hi all look out guy there is another wargamer about :evil: yuyotuiie :evil: :evil:
  25. geoff57

    Torque Arm Feedback

    hi all I'm starting this thread to help ebikers out there who have hub motors and need torque arms for them advice from all is wanted as I want to make this as compleat as posable. companys that make arms axel hole shapes for diffrent motors size and thickness of arm for a motor at a voltage...
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