Search results

Date Relevance Most replies

  1. M

    light 20S battery build

    Hi all, I ride a 4t MXUS 3k with 80A Sabvoton @ 20S. I seek advice for a light 18650 build. Currently I have a 20S 15Ah Multistar 10C battery. I want something lighter and possibly smaller for shorter commutes. Before I had 10Ah Multistar and it did get almost hot at times, so I upped the...
  2. M

    Simple charge voltage limiter board

    Just bought this item on Aliexpress, in fact I've been wishing for a similar solution for years: https://www.aliexpress.com/item/3-7V-120V-CNC-Storage-Battery-Lithium-Battery-Charging-Control-Module-Battery-Switch-Protection-Board/32723941013.html?spm=2114.01020208.0.0.hMuZah So this little...
  3. M

    Troubleshooting controller / replacing MOSFET.

    So I probably blew my controller. It's an EB306 with 4110 fets from em3ev. Motor is 8 turn Bafang BPM. I was going full throttle at 74V battery voltage and about 35 to 45 phase amps (45 to 60 km/h) with this poor boy for about 3 kilometers when power suddenly cut off. I pedaled home and took...
  4. M

    Ghetto charger for 50S li ion pack

    Guys. I have a 10S20P touring battery for a 36V 20amp controller, made of five 10S4P Samsung 29E packs. I am thinking of making a switch to turn it into a 50S battery which seems like a great voltage for ghetto charging on 220V outlets. The resulting pack would be 210V fully charged. I am trying...
  5. M

    Turnigy Multistar - lightweight 10C cells

    HK has pulled out yet another bait. http://www.hobbyking.com/hobbyking/store/__56840__Multistar_High_Capacity_4S_5200mAh_Multi_Rotor_Lipo_Pack.html 15-20% lighter than regular Turnigy. Hope they haven't overrated the capacity even more than with my Zippy Compacts...
  6. M

    Phylion 36V battery won't charge

    I got an old bike with 10S 36V li ion Phylion battery which had limited range so I opened it up to recharge one of the cells that got too low. I disconnedted charge and discharge plugs within the battery, then reconnected them, but the battery won't charge anymore thru the charge socket now. The...
  7. M

    SHENGYI new style lighter 9c type DD motor

    Hi, I was looking for a substitute for my smoked em3ev DD hub and discovered this motor offered by a local vendor in Slovakia. http://www.elektrobike.sk/elektrobike/eshop/6-1-Prestavbove-sady-nad-250W/0/5/73-prestavbova-sada-Sinus-500W-bez-baterie Looks to be same diameter as 9c, with a...
  8. M

    Zippy Compact 35C cells overrated!

    Bought 7 of these (10S 4.5Ah) to make a 20S 13.5Ah pack and have one spare brick. The price was $60 a piece in NL Warehouse on flash sale, a real bargain for 35C cells. The box was damaged but cells arrived intact and well balanced, all within 3.82~3.85V, ready for paralleling. As far as...
  9. M

    using 2812 9c motor as a generator

    Hi All! A relative wants to build a stationary 4-person bike with a hub motor that generates electricity for some home appliances like water kettle, bulbs, music player etc. He wants the output voltage and power to vary along with the pedal power input. I want to keep it very simple, without...
  10. M

    using Thermal switch to cut power in hub motors

    I've done this in the past. I use this kind of switch epoxied on rotor windings to make a motor more durable. http://www.motorthermalprotector.com/supplier-thermal_cutoff_switch-25813.html I put it inline with hall supply red wire, so that temp rise above 105 deg. switches the halls off. Since I...
  11. M

    Going from 36 to 72 spokes on hub motor wheels

    I'm done with replacing spokes on rear hub motors. It seems like whatever I do, the spokes do break or come loose ultimately. Belleville washers are nice but introduce their fair share of issues. For my next build I consider a 36h setup hacked to 72h. Anyone done hub flange and rim hole...
  12. M

    Bafang 8FUN BPM spares gears cover clutch available at GBK

    So I had a 15-email exchange with Anna @ GBK the other day, explaining BMSBattery wouldn't provide any spares for the numerous BPM2 motors I have from them. It took her some time to understand what gears, clutch and side cover were, but luckily it didn't take long until she offered them to me...
  13. M

    Temperature inside hub motors - choosing a thermal fuse

    So I cracked my motors open the other day to replace broken halls. I saw the rear BPM was a bit roasty so decided to install a 105C temp cutoff switch inline with hall supply. I did the same on the front GM mini and epoxied the switch to the windings to have a direct contact for quicker...
  14. M

    2WD / 1WD dilemma for heavy rider

    Rider = my dad, fairly obese at 130kg, bad knees, wants solid assist up almost any hill, pedals mildly and steadily. I feel the bike (700c wheels) needs to be designed to work completely without pedal input for the worst case, and tackle 7-10% hills while at it. No more than 16 mph / 25 kph...
  15. M

    Choosing the correct motor wind

    Let's face it, many of us never get beyond the fuss of achieving our desired speed using a given voltage and motor wind. Which is fine of course, as long as we accept the reality of being limited to a certain choice of winds and voltages. But it's always raised a question to me, am I more...
  16. M

    Is it safe to run 24S lipo / 100V battery on 100V fets/caps?

    Although much has been mentioned in other threads, there had always been some degree of disagreement on this topic. There are a lot of controllers running 4310/4110 or other 100V fets and 100V caps, but they are mostly rated for max. 72-74V nominal battery voltage. Still, many use them with...
  17. M

    sourcing Big Chainrings + chain guards

    Running a dual 2807 @ 15S lipo gets me to about 60kph. At this speed, a 52/11 gearing is just fine. You can buy any road crank with 52T chainring, but few of them actually have any chain guard, so essential for commuting. I briefly googled and found these options...
  18. M

    9c geared motor thread

    I got my new 9c geared motor running today. Here are a couple initial impressions: - It does about 20mph @ 45V / 26" on flat and is pretty silent at higher speeds - I was afraid of using a 9-fet 30A lyen controller, but this motor never takes more than 15-20A under load with moderate pedaling...
  19. M

    Building a Kona Ute cargo/commuter bike

    Hi folks, thanks for lots of useful resource over here. This is my first post so plese be patient with me for some time. I have done road, mountain XC and DH races before, so I have been using pretty much all kinds of bicycles over the past 25 years. Recently I picked a Kona Ute 700c wheeled...
Back
Top