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  1. W

    Votol EM-100 & EM-150 controllers

    Oh, if reverse engineering were not just that cumbersome :-\ would really be nice to test this on a brake motor test station.
  2. W

    Votol EM-100 & EM-150 controllers

    But still nobody out there who knows what this figure means exactly?
  3. W

    Kawasaki KL 250 A build

    Still worrying about battery temperature. Ordered power resistors in China for some package scale tests, but looks like they got stuck in Christmas parcel flood :oops: So I built a small test pack (4S1P) that fits my discharger at hand and pack it into some insulation to get a rough idea. I...
  4. W

    SilentEnduro conversions

    Thanks for the image :) Looks like an elegant, lightweight solution. You have good lathe including operator in your team :thumb: ? Have you tried smaller front sprockets? Could make live much easier. Why do you still use the genuine 14T there.
  5. W

    Ideas for EV farm machinery

    Thats not my business. Full stop.
  6. W

    Ideas for EV farm machinery

    ....well, yes, and a lot less material to buy in the beginning. :wink: But also a lot less money to make for the manufacturers and dealers, of course. May that be the reason why their prototypes still stick to the dino paradigm? :oops: Another motivation is that I like the way of living as...
  7. W

    Ideas for EV farm machinery

    When robo lawn mowers and robo vacuum cleaner entered the market, I kept laughing for quite some time. But in the mean, they are an established concept. Isn't this right the same idea of downsizing, combined with autonomous operation?
  8. W

    Ideas for EV farm machinery

    Interesting Image. I like the crane they use to handle the cable - looks like a standard piece of equipment, no need to reinvent the wheel. I also like the reeler. Hope they did not reinvent this one. A bit large for my taste, but I'd like to get such a thing. Where may I look? Crane...
  9. W

    Ideas for EV farm machinery

    Yes, that's the reason why I'd slow down for additional energy efficiency. I'm not sure where the optimum is, but I remember that somewhere above 4 km/h, power requirement increases at disproportional high rates, producing additional wear and soil compression. My plugh ran at 250 HP before, at...
  10. W

    SilentEnduro conversions

    :bigthumb: In the Votol-Thread, you mention a 2-stage transmission. How did you make that? Do you think that this high ratio is required? obviously, if you even want to use a larger rear sprocket? I'm going to convert an old KL 250, using a QS 138 with Votol 150, and I'd like to try it single...
  11. W

    Votol EM-100 & EM-150 controllers

    :bigthumb: :bigthumb: :bigthumb: to @SilentEnduro
  12. W

    Ideas for EV farm machinery

    regarding the question of till vs no till: That's not the point for me here. If can drive an electric gadget in parallel tracks over the field, I can let do it pretty much anything I want. So I'd like to leave evergoing agricultural discussions where they belong - they have their place there, no...
  13. W

    Ideas for EV farm machinery

    My Idea was to use ordinary standard industrial asynchronous AC induction motors. They are designed for 24/7 and quite cheap. Simplest design would be to attach each wheel to a simple worm gear motor. Had the advantage that I don't have to design for a brake. But worm gear may not be the best...
  14. W

    Ideas for EV farm machinery

    Yes, of course, you can use Glyhosate aka Roundup, of course. But I'm in organic farming, so well, let's say - I don't like that - OK :wink: I've been watching no plugh systems in organic farming coming and going for decades. Maybe in some areas it may work - in my area I don't know anybody...
  15. W

    Ideas for EV farm machinery

    still playing with the cable loss calculator. Losses scale inverse to the square of voltage, and DC is more effective than whatever fluctuating stuff such as AC. I think I should go for DC at max of the cabling rate. If I stay with H07RN-F - which is a standard cable type, produced at high...
  16. W

    Ideas for EV farm machinery

    The challenge of reeling and unreeling doesn't sound that complicated in the first instance. If I have GPS guided track and speed, I have reeling rate to compare against, I can check the cable tension and compare real reeling rate with real speed - to check for problems. I'm sure that's not a...
  17. W

    Ideas for EV farm machinery

    Just did a quick hack to check feasibility. (Used some online tool in German language) 10 kW, 400V-3P -> 14,43 A 500 m cable lengt, 10 mm² -> 5,3 % voltage drop This is more than recommendet for fixed installations in DIN 18015, but still OK I think. I even might live with more, 4mm² -> 13,25%...
  18. W

    Ideas for EV farm machinery

    Hm... interesting idea. Not sure how reliable this were. I run an irrigation machine that pulls the pipe towards a fixed drum. Needs quite some effort to control it. Well, technology from the 1980ies, and moving pipe. If it were possible to carry the reel on the tractor, there were no need to...
  19. W

    Votol EM-100 & EM-150 controllers

    :bigthumb: :bigthumb: not off topic at all imho That's the spec, that' where it starts and where the settings are supposed to go to. As people said, it all goes together, holystick or so, they called it :lol: You run the QS 138 on the Votol 150? May I ask you for your transmission rate and...
  20. W

    Kawasaki KL 250 A build

    Not my plan yet. Compared the batteries weight to the drivers weight :lol: and decided that it's not worth the hassle. I'll make 4 x 5S32P I'd attach quite fixed. When I want the controller to run at 200 or 250 A boost amps, I think 32P is really good for cell health, although the VTC4 might...
  21. W

    Kawasaki KL 250 A build

    I also finished spot welding my first quarter battery pack. Its being charged now, checking if it heats up. Next I plan to test it at 200 A - to make a decision about cooling requirement.
  22. W

    Kawasaki KL 250 A build

    Pulled the Kawa from the shed today Not nice, better not zoom in :wink: Do I really want to save it from the scrap pile? Anyway, let's have it a chance :lol: Put it on the scale, 119 kg unstripped - just for the records
  23. W

    Ideas for EV farm machinery

    Thanks for the flowers :wink: I think all the large manufacturers are working on projects like those, as some universities do as well. But when it comes to delivering, I expect them to try any available option of "customer lock in". So we'd expect a lot of propietary solutions, not...
  24. W

    bluetooth BMS?

    looked up mayibms.com, but can't get very far there. May be someone capable of Chinese language could go farther. They have an "EN" button, but that seems just to translate the menu, not the content. Their images still seem to display the old versions of the BMS. So I don't see what all those...
  25. W

    bluetooth BMS?

    hm. looks like they have changed the board. I has printed on silk RV24.1.4 ANT-BMS-24S WWW.MAYIBMS.COM The BT module is soldered to the board,so I don' want to unsolder this to connect a serial adaptor. Can I connect a PC software at all? Do I need one, at all? I don't see any other serial...
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