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  1. flippy

    sillicone layer over cell tops

    as the topic implies, i am trying to find a nice solution for using a large 18650 battery in a quite moist/humid (mobile) application. my idea is to build the pack as usual and after welding it make a 1cm high edge from tape around the battery that i then pour a nice layer of sillicone over it...
  2. flippy

    PSA: dont underspec your strips

    ....because of you do you will end up with something like this: melty.... the customer came to me because often he would smell something "funky" after pulling full amps. this is from a pack that was built by "a friend" for him. he used the cheap 0.15 nickel plated steel and simply started...
  3. flippy

    changing sevcon behaviour

    govecs put a gen4 size 4 in all their scooters and they all seem to have the VERY annoying habit of "hunting" at the top speed. this means the max rpm fluctuates slighty constantly despite being under constant load. i am looking at DVT but i have trouble changing the right settings to stop...
  4. flippy

    Voltage versus current pack

    Just wondering what the general consensus is. If you can build a 16S25P battery or a 20S20P battery what would be better? My view is that you can get the the same power draw with less amps on the 20S pack. And have to limit top speed so it can drive at the same full (limited) speed the whole...
  5. flippy

    Heavy duty spot welding electrodes.

    I am starting to build bigger and bigger batteries. So far i worn out 3 chinese spot welders and currenty running a german one and have one on spare if it does blow up. My main problem right now is being unable to hold the electrodes due to heating and having to stop to let them cool. I...
  6. flippy

    Mean Well ELG 150W teardown

    i popped a ELG-150-36A a while back with overheating it constantly. decided that in the name of science i would destroy it even further. here is the link to the full res album: https://imgur.com/a/fVMnFP0 the pcb is made from cheap fiberglass. but all the components are...
  7. flippy

    mass life cycle testing

    Due to a cronic lack of decent testing results i concluluded that someone has to bite the bullet for this so i am planning on buying a 8 channel battery tester in order to finally get to the fine details on what is the best way to make your cells last as long as possible. so far my plans have...
  8. flippy

    more volts better?

    the time has come that i need to decide on what to do in life. right now i have a nice 16S25P battery. but the little voice in me is saying i need to rip apart the entire pack and rebuild it into a 21S19P battery. that voltage is at the limit of the controller (regular KLS7230) the goal for...
  9. flippy

    10" hub motor rubs after new bearings

    I have "rebuilt" my 10"hub motor (scooter, not a bike) with new SKF bearings to replace the chinesium ones that were completly shot. had to resort to using propane to heat it up to get them out. i just froze the new bearings and tapped them in. removed all the rust (a bit from water that got in)...
  10. flippy

    speed the same after increasing voltage

    long story short: i had a 120A kelly controller running 13S (54v 4.2v) and my speed was 48kph on a fresh charge running down to 43kph when empty. (hub motor is a 10kv i think) i stripped the battery and made it 16S (64v, 4.0v max charge for lifespan) and replaced the controller and upped it to...
  11. flippy

    replacement motor wire

    i am currently trying to rewire a standard chinese 10" hub motor for my fun scooter. (i have a different one for work) but it seems very hard to find high quality wires that can replace the crusty aluminium wires that can fit in the axel hole. does anyone have any solid shops were to get such...
  12. flippy

    maxing out phase amps

    currently i am running with a "120A" kelly controller and i am limiting the battery current to 50% in order to keep the motor from releasing the magic smoke. (2.5kW 10" hub motor) i have the phase amps at around 50% and have some questions about the actual limits of the motor. if i increased...
  13. flippy

    replacing FET's with contactor

    i need some advice on how to do this. my BMS is officially rated for 50A continuous (100 peak) but i blew the ass out of 8 of the 20 FET's after just 300km of driving with my controller at 60A peak (15A cruising). you can see part of the blown asses here: now i want to replace the FET part...
  14. flippy

    how to properly set up controller

    ...without blowing your controller or motor. i am working on the upgrade of a scooter i bought with dead lead acids and i need some input from experience. prehaps due to the size of the forum i cannot find a decent guide (for lack of a better word) on how to set up a controller properly. in...
  15. flippy

    bms hacking advice

    i am planning on building a 390 cell pack for the electric scooter for the missus that needs 100+km range and i plan to make it 13S 30P with samsung 29E's. scooter drivetrain is standard chinese (already modded the controller shunt and upgraded wiring and FET soldering quality) with a measured...
  16. flippy

    max current draw on standard bike

    first post, please be gentile. (or use lube) while scouring the forum for all kinds of data (johnny must have more input!) i seem to drawing a blank on a few. situation is as follows: got 2 bikes (identical, parents bought the secondhand) with bog standard 36v crappy chinese hub drives and...
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