Search found 69 matches

by wjr
Dec 22 2019 11:43am
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 697
Views: 58551

Re: 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.
by wjr
Dec 21 2019 5:26pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 697
Views: 58551

Re: Votol EM-100 & EM-150 controllers

SilverLine wrote:
Dec 16 2019 10:10am
...."flux weakening compensation" of 80, was the new default ....
But still nobody out there who knows what this figure means exactly?
by wjr
Dec 04 2019 7:20pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Kawasaki KL 250 A build
Replies: 9
Views: 1589

Re: 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 think th...
by wjr
Nov 29 2019 4:29am
Forum: E-Scooter and Motorcycle General Discussion
Topic: SilentEnduro conversions
Replies: 31
Views: 5416

Re: SilentEnduro conversions

here is how 2-step reduction is made: reduction.jpg Tried large rear sprocket 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 ...
by wjr
Nov 28 2019 4:56am
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: Ideas for EV farm machinery

Hillhater wrote:
Nov 27 2019 6:40pm
When you have individual cropping areas measured in many sqr kms,
Thats not my business. Full stop.
by wjr
Nov 27 2019 3:30pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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 a free fa...
by wjr
Nov 27 2019 11:47am
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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?
by wjr
Nov 27 2019 11:45am
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: Ideas for EV farm machinery

It appears that much of this is already being developed.. https://www.farmweekly.com.au/story/6217775/john-deere-trials-electric-tractor/ https://imagizer.imageshack.com/img922/9721/TCyfi4.jpg Interesting Image. I like the crane they use to handle the cable - looks like a standard piece of equipmen...
by wjr
Nov 27 2019 9:17am
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: Ideas for EV farm machinery

Even with a single plough your 20kW device will need 10,000Nm for a similar ground speed on a similar wheel size. 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 ...
by wjr
Nov 26 2019 3:10pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: SilentEnduro conversions
Replies: 31
Views: 5416

Re: 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 stage.
by wjr
Nov 26 2019 3:01pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 697
Views: 58551

Re: Votol EM-100 & EM-150 controllers

:bigthumb: :bigthumb: :bigthumb: to @SilentEnduro
by wjr
Nov 26 2019 2:57pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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 dou...
by wjr
Nov 26 2019 2:45pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: Ideas for EV farm machinery

Since you'll have torque from low speeds, it changes the nature of the gearing and differential massively - dual motors with planetary reductions? 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 t...
by wjr
Nov 26 2019 2:33pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: Ideas for EV farm machinery

Why do you need to Plough ?.... it is not considered to be necessary for modern farming techniques. 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 com...
by wjr
Nov 24 2019 5:46pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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 volume di...
by wjr
Nov 24 2019 2:44pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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 wheel ...
by wjr
Nov 24 2019 2:35pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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% , 226...
by wjr
Nov 24 2019 1:50pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: Ideas for EV farm machinery

A good reel system with a high voltage cable could avoid the need for mobile batteries. 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...
by wjr
Nov 24 2019 1:33pm
Forum: E-Vehicles General Discussion
Topic: Votol EM-100 & EM-150 controllers
Replies: 697
Views: 58551

Re: Votol EM-100 & EM-150 controllers

a bit offtop, :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 rat...
by wjr
Nov 24 2019 1:19pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Kawasaki KL 250 A build
Replies: 9
Views: 1589

Re: Kawasaki KL 250 A build

Did you consider splitting the pack into 20s 8p or 20s 16p modules? 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 thin...
by wjr
Nov 23 2019 8:45pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Kawasaki KL 250 A build
Replies: 9
Views: 1589

Re: Kawasaki KL 250 A build

I also finished spot welding my first quarter battery pack.
IMG_20191124_005746_30.jpg
IMG_20191124_005746_30.jpg (256.68 KiB) Viewed 1401 times
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.
by wjr
Nov 23 2019 8:20pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Kawasaki KL 250 A build
Replies: 9
Views: 1589

Re: Kawasaki KL 250 A build

Pulled the Kawa from the shed today
IMG_20191123_155642_30.jpg
IMG_20191123_155642_30.jpg (266.8 KiB) Viewed 1402 times
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
by wjr
Nov 23 2019 7:42pm
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 57
Views: 5887

Re: 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 compatible with e...
by wjr
Nov 23 2019 1:14pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1274
Views: 148830

Re: 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 unused...
by wjr
Nov 23 2019 1:05pm
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1274
Views: 148830

Re: 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 port than...