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  1. E

    I want to know who these MOSFETs are!

    Yes some of them have little to none installed.
  2. E

    I want to know who these MOSFETs are!

    These seem to be commonly found in e-bike controllers, are pretty durable and don’t seem to have many issues. They can be improved by adding thermal paste to improve heat transfer. I think my common unmodified 12 FET KT 40a controller uses these and barely gets warm.
  3. E

    Suitable battery for an 1800W 48V 38A motor?

    The number of Amps will be printed on the controller. If it really is 38A, you will need at something like a 5p (5parallel strings) battery with high power 18650 cells capable of 10A or more each. For the budget, look at a 14S 5P 18650 battery using high power brand name cells like Samsung 25R...
  4. E

    Battery does not charge above 10% all of a sudden

    It might be one cell has gone bad, and the BMS is shutting down to protect the rest of the battery. If so the battery won’t work again unless it is replaced. If they are brand name cells (Samsung etc) it’s worth paying for someone to fix, if they are no-name cells then it’s new battery time...
  5. E

    Playing with high current 1S 161P Battery pack. Theoretically capable to 4830A output

    Whoa
  6. E

    Cyclone 3kW ===> 5kW????

    You need to run it in a lower gear so it spins faster. It’s producing too much heat at low revs. It doesn’t do well at ‘pedal assist’ speeds. My technique when I used it daily was to drop down a gear, give it a blast while ‘ghost pedalling’ then change up gear, coast/pedal for a bit, then repeat...
  7. E

    1st battery build (20s2p) - collective advice?

    So I have run a 13S 1P pack of 21700 VTC6A and it works well. However it does get pretty warm and doesn’t last long until the low voltage protection kicks in. Suggest trying for 2p if at all possible.
  8. E

    Cheap 54V 750W power supply/charger - Cisco 341-0533

    If anyone is after a 54v 14A power supply, a cisco 341-0533 for a POE switch could be used. Simply jumper the last 2 pins in the second row of small pins and it’s good to go. (Exact pinout unknown, I’ll be looking for a way to adjust to 58V if possible!) One set of contacts is 12.6V 20A and one...
  9. E

    Shaft slightly small for bearings

    The old mechanics trick is to use a punch and a hammer and put a handful of punch marks inside the bearing inner. This will make a shaft fit tightly but not so much that it can’t be removed later. You can also use a drop or 2 of Loctite or similar bearing retention glue.
  10. E

    Audi Cross Pro Build

    Awesome!! A great looking bike for sure. Will the battery be close to the front wheel at full shock compression?
  11. E

    Need experienced advice to let me know what to expect from those cells in real life

    Lithium Iron Phosphate batteries are lower energy density and therefore heavier for the same capacity as Li-ion. They have high C rate and god cycle life though. If you had a 2 parallel 16 series pack that would need 32 of these cells, which would weigh 7kg, not too bad but it would be bulky in...
  12. E

    What kind of safety measures do you take when building battery at home?

    Some chargers have a ‘Storage’ function which discharges to a lower voltage, that’s what I use to equalise the cells at a lower voltage. I wouldn’t short any cells as they can still give a big spark. Strongly recommend taping up any metal parts of the battery apart from the p group you are...
  13. E

    Build two wheel drive without cycle analyst

    You could use one half twist throttle and one thumb throttle to control the motors independently. You would need 2 displays ( or none and just use ones with Bluetooth and a basic cycle computer)
  14. E

    Electrifying a cargo bike - Mid drive or Hub?

    I have a Juiced ODK with front geared hub which works really well. it’s great to have 2 independent drivetrains; if your chain snaps with a mid drive you are stranded! A bit of reassurance with the little one on board that it is very likely to get to the destination. If those front forks are...
  15. E

    torque arm picture thread

    I bought some cheap adjustable torque arms from aliexpress and am pretty disappointed- they are loose as a goose with huge amounts of play in the teeth and the axle slot. I will attempt to shim the axles and epoxy the teeth but it’s a bandaid. Luckily they are on a thick steel fork of a factory...
  16. E

    Anyone familiar with this ML7280 clone?

    I have one of these and am looking to mod it to get better throttle response etc. Attached is a pic of the rear of the connectors. I think the round circular connector is for a display, and the programming cable is part of the 30-pin connector. (The real mq7280 from the mqcon website has its...
  17. E

    1Kw GEARED hubs finally here: New Bafang g0hs.1000.dc

    The motor comes with a plug on the end. Provided with it is a matching socket with cable, socket cable has bare wires at the other end.
  18. E

    1Kw GEARED hubs finally here: New Bafang g0hs.1000.dc

    Just connected same colour wires and it all just worked. Took a lot of changing P and C parameters to get it working nicely though. I am going to try a sensorless KT and then maybe move to a Sabvoton as the throttle response is just too slow on the one I’m using. Also going to try the open...
  19. E

    Mountain bike for commuting build

    The hard plastic fenders available are pretty robust (mine are tough polycarbonate) and can be cable tied securely; but it really helps if there are rear rack or fender mounting points on the bike; unfortunately its less common on full sus. You need a decent gap between the top of the wheel and...
  20. E

    in 2023, what are the great battery options out there?

    Have a look at the long term cycle life tests on this forum, should provide some Info.
  21. E

    Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc

    I have an offer of Mitsubishi PHEV cells- yuasa LEV46 in 8s1p modules, each weighing 13kg. But from what I can see each cell is 46AH for 1.5kg which is about half the energy density of a common 21700 cell. For an application like an e-bike where space and weight are important these seem like...
  22. E

    rusty bearings, and filling motor cavity with oil ?`

    I don’t think youll need a puller. There only should be a circlip or something holding the motor in the rim, or even just the pull of the magnets. Strongly suggest taking it all apart and replacing bearings, you’re practically there already. The motor won’t last 5 minutes with rusty bearings
  23. E

    sleeper powerwheels build, thoughts on battery

    Neat project! Perhaps you could fit some automotive cells in there - a couple of Hyundai ionic modules or mitsi outlander cells? Or just get custom 18650 pack - great thing about them is they can be made to any shape.
  24. E

    Closed thread

    I have had good luck with a geared hub motor using a KT S09P-BL sensorless controller. I use throttle and no PAS. Some setup in the mobile app required but after that nothing, just drive. 3 motor wires, 2 battery wires and a throttle.
  25. E

    New Meanwell 60V 4A Li-ion charger - NPB-240-48TB

    Looks like Meanwell has released a professional fanless constant voltage constant current Li-ion charger, adjustable up to 60V 4A. Available with screw terminals, Anderson or XLR. This will no doubt be a much better alternative to the cheap no name brands...
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