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  1. Ekart

    Ekayak first project

    Thanks methods, just a fun project ... and very handy as I used to paddle up river and then the wind would pick up and nearly kill me to paddle into the headwind back to the car... if you don’t mind me asking ..where did you get your yellow battery packs from? Are they lithium , what...
  2. Ekart

    Converted alternator on ebike controller

    Thanks again Stan for your great info and knowledge on the subject, I really appreciate your help! I will look into those cell packs and do plenty of research before buying. I’m also interested in building my own “power wall battery pack” for my solar panels which will be about 10KW as the Tesla...
  3. Ekart

    Converted alternator on ebike controller

    Hi Stan thanks for all that great information! Running an alternator at 20,000 rpm you would hear it coming down the street! The RC 24v /80Amp batteries sound good! Where can I get those please? I bought my 1500w 48v controller for the ekart from Aliexpress for AUD$39. Which I thought was...
  4. Ekart

    Ekayak first project

    Yes lithium will be the next step .. and I can also use on my eKart and ebike!! (Other sections in this endless-sphere forum). Lithium would be lighter to carry down to the waters edge also!
  5. Ekart

    Converted alternator on ebike controller

    Wow thanks Stan, those charts really show the efficiency changes with those field current inputs. Yes the lead acid batteries were a cheap starting point. $50 for the four. But I’m looking at around $3-400 for lithium packs so thats the next step. Even making your own is not cheap .. 18650’s...
  6. Ekart

    Ekayak first project

    Hi guys just wanted to show you my first "E" project 2-3 years ago I made up a transom and attached to my Kayak then added a 34lb thrust WaterSnake (shortened the shaft) 5 speed outboard motor. I use two 12v 18Ah batteries in parallel and this gives me a range of about 10km on the river at up to...
  7. Ekart

    Converted alternator on ebike controller

    Many thanks Stan...that's great info and saves me wasting my time. I had thought to use it to "kick start" the ekart from standstill but probably not worth the effort and extra weight/cost involved. I will check out "Tucker, the man and his dream".. I appreciate all the great info you guys are...
  8. Ekart

    Converted alternator on ebike controller

    Hi markz Yes I saw Joker as well.. very “dark” movie, the first of a few I think! The pancake motor is rated at 36v dc and draws about 11.6Amps, so thats 417.6 watts which is just above 1/2 hp roughly, but I had it running on 24v only 2x12v in series, so maybe 1/3 hp realistically. It was ok...
  9. Ekart

    Converted alternator on ebike controller

    Hey markz, here’s my first project you may like .... an ebike using a printed circuit motor (pancake motor) running off two 12v 18Ah batteries in series. The motor is from a mainframe computer reel to reel tape drive ( from about 1976) I had kept for a rainy day. I used a DC controller for speed...
  10. Ekart

    Converted alternator on ebike controller

    Hi Stan, thanks for your thoughts and ideas, yes varying the field current on the alternator rotor would be good and I have worked with Arduino quite a bit with multiple sensor types. An inductive sensor could work well to monitor Alternator rpm and adjust current through windings accordingly. I...
  11. Ekart

    Converted alternator on ebike controller

    Hi markz, yes 12 volt on the rotor windings via a separate battery now. The shaft on the pulley was 5/8" threaded at the outer end to take the Fan and split pulley with lock washer and nut. These were replaced first with pulley and "V" belt and eventually replaced with sprockets and a large...
  12. Ekart

    Converted alternator on ebike controller

    :bigthumb: hi guys, just an update albeit a few weeks later! The Ekart is working!! I rewired the alternator for “Star” connected and away it went ! Draws about 14Amps at 46v whilst running at about 25 mph.
  13. Ekart

    Converted alternator on ebike controller

    Yes a rolling start has been tried and same problem..just stops, but will recheck, we've done some changes since then. My son thought of reversing the polarity on the rotor winding battery but have not yet heard of the result.....cheers!
  14. Ekart

    Converted alternator on ebike controller

    Hi markz, I watched the original idea video again here: https://youtu.be/IKqy3rRWJQE and his battery pack that apparently works is made up of 4 of 12v 12Ah gell cells and ours is 4 of 12v 18Ah gell cells so I’m thinking it should be ok?? Battery sag on full load goes down to 46v and LVC is 42v...
  15. Ekart

    Converted alternator on ebike controller

    Thanks eee291, I think you have it! I do not know enough about those batteries and how much instantaneous current they can/could provide. We will try better batteries .. I guess you guys use lithium iron cells in a pack? Lighter and able to provide 45amps?? Cheers
  16. Ekart

    Converted alternator on ebike controller

    Controller used is http://s.aliexpress.com/IrMjMze2
  17. Ekart

    Converted alternator on ebike controller

    Hi amber wolf, it’s a AUD$40 AliExpress controller model 2922043 brushless controller... here’s the specs Strong driving stability Phase 120/60 compatible Start the anti-speed function Waterproof and moistureproof Hall/Hallless Dual Mode Compatible Turn the line short-circuit protection function...
  18. Ekart

    Converted alternator on ebike controller

    Hi there, yes you have some very good points there... no BMS just 4 of 12v 18Ah gell batteries in series to make 48v for the stator windings and one 12v lipo battery for the rotor winding. Rotor winding draws about 1.5A max. Once the wheel turns slightly under load and stops I then have to...
  19. Ekart

    Converted alternator on ebike controller

    Hi eee291, yes I have a separate 12v battery running to the rotor windings through the brushes. I have contacted the guy that did the youtube video also ... https://youtu.be/IKqy3rRWJQE my controller is supposed to be a sensor or sensorless type so hopefully he can shed some light on it.
  20. Ekart

    Converted alternator on ebike controller

    Hi Flat tire, and thanks for your reply. Yes I think so I have reduced it to about 4:1 and the tacho reads about 3200 rpm at the alternator sprocket flat out. Sitting in the kart you get a definite jolt of a few inches then stops, almost like the controller is waiting for a “tacho” signal and...
  21. Ekart

    Converted alternator on ebike controller

    Hi eee291, thanks for your reply, no did not put magnets on rotor. Are they used for sensor triggering or some kind of pulsing back into the stator windings? I followed this chaps video.... https://youtu.be/IKqy3rRWJQE and he dosen’t seem to use any? Cheers
  22. Ekart

    Converted alternator on ebike controller

    Hi guys, just a new member and have a question if anyone has experience in connecting a brushed car alternator (I rewired it to a 3pole motor -Delta connection), connected to a 1500w 48v controller. It runs fine with wheels off ground but when under load moves a few inches then stops? The...
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