Search found 782 matches

by Ohbse
Sep 23 2019 1:30pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 1092
Views: 69278

Re: Tesla Model 3

? Are you suggesting they never ran a full lap ? But they just spent several days there running laps with the stated intention of setting a time. So why no time posted ? Not even an “unofficial” time ? They were happy to post a time for Laguna At least they qualified for the “Bongard” club. ! No ti...
by Ohbse
Sep 19 2019 4:44pm
Forum: E-Vehicles General Discussion
Topic: Taycan video with some useful information
Replies: 31
Views: 893

Re: Taycan video with some useful information

Based on my experience and research on battery thermal management, Tesla has done a very good job with the system they are working with, but it is by no means the best. It has been optimised for the task (driving a 2 ton saloon car down the road a long way) and it does that very well. But more supe...
by Ohbse
Sep 19 2019 5:09am
Forum: E-Vehicles General Discussion
Topic: Taycan video with some useful information
Replies: 31
Views: 893

Re: Taycan video with some useful information

But we know the “S”has always had an issue with thermal build up in their pack (and the motor.) Those issues are magnified at higher power levels (amps !) Induction motors are capable of huge burst power but have inherent thermal limitations with rotor cooling, the model S is a well optimised syste...
by Ohbse
Sep 19 2019 3:37am
Forum: E-Vehicles General Discussion
Topic: Taycan video with some useful information
Replies: 31
Views: 893

Re: Taycan video with some useful information

It's possible there are thermal advantages from the higher voltage relative to other inverter tech available to Porsche but it can't be assumed.. generally higher voltage capable silicon has a proportional increase in resistance. There are 'sweet spots' where system efficiency peaks and perhaps 800v...
by Ohbse
Sep 18 2019 4:40pm
Forum: E-Vehicles General Discussion
Topic: Taycan video with some useful information
Replies: 31
Views: 893

Re: Taycan video with some useful information

A great article with some very interesting details. Standout for me is the large number of additional components when compared to the Tesla drivetrain. In particular comparing Taycan to the construction of the Model 3 there's a lot of additional complexity. The transmission, multi plate clutch, actu...
by Ohbse
Aug 25 2019 11:17pm
Forum: E-Vehicles General Discussion
Topic: Battery dilemma - Voltage
Replies: 7
Views: 455

Re: Battery dilemma - Voltage

Unless you have a controller with >100v rating, then moving to 24s will most likely end in disappointment with a fried controller. There are many tales of people getting away with it for a period of time in the pursuit of peak performance, but that's not really relevant any more in this age of more ...
by Ohbse
Aug 19 2019 10:58pm
Forum: E-Bike Technical
Topic: Oil cooling your hub- NOT snake oil!
Replies: 608
Views: 107497

Re: Oil cooling your hub- NOT snake oil!

It's been 2.5 years since i posted that little blurb on sealing your hub.. for anybody new to this now, much has changed - just go buy some statorade and enjoy the same result with no mess!
by Ohbse
Aug 13 2019 8:27pm
Forum: Motor Technology
Topic: Legit electric motor technology breakthrough?
Replies: 19
Views: 1682

Re: Legit electric motor technology breakthrough?

Pretty obvious from their videos and marketing materials that their initial market will be "upscale" -- i.e. military, industrial, aeronautics, and certain construction technologies where there would be a premium for fail-safe operation. I can't see them moving downscale anytime soon. First product...
by Ohbse
May 29 2019 9:28pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Lightweight Retro Electric Motorcycle Design
Replies: 5
Views: 655

Re: Lightweight Retro Electric Motorcycle Design

My long term around town average energy consumption is about 52wh/mile over the past 20,000km. That's rapid acceleration, 35-40 mph cruise, bike weight of 42kg, QA v3 in 17" rim, 18650 pack, 20s 36ah from Samsung 30q cells. Top speed is >70mph. Power peak is around 12kw in daily ridden form. I weigh...
by Ohbse
May 02 2019 5:18pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: I blew up ANOTHER controller
Replies: 7
Views: 497

Re: I blew up ANOTHER controller

Root cause is Kelly are rubbish, I feel like we need a sticky at the top of the board with a PSA about their issues. Random detonations are par for the course unfortunately... People luck out and get one that won't explode and post positively about the experience, but unfortunately there are a lot m...
by Ohbse
Apr 28 2019 9:21pm
Forum: Items for Sale - Used
Topic: mobipus voltage
Replies: 9
Views: 581

Re: mobipus voltage

I started off with 20s, now I'm running 18s. Obviously higher voltage is going to offer potentially better performance, but in practice you're much more likely to hit some kind of protection as you'll be close to the FET maximums with 22s. Personally I would go with 20S and re-package the pack to ha...
by Ohbse
Apr 16 2019 7:34pm
Forum: Motor Technology
Topic: Choosing the right controller for QS205
Replies: 4
Views: 324

Re: Choosing the right controller for QS205

Build sounds good, you'll definitely have fun :thumb: What size wheels are you intending on? Here's the summary of most of the existing options: Kelly - Junk performance, Junk reliability Adaptto - Inconsistent performance, hate QS v3 hubs, junk reliability, literally can't buy them if you wanted to...
by Ohbse
Apr 12 2019 10:19pm
Forum: E-Bike Technical
Topic: Recommended Soldering Iron for 5AWG?
Replies: 11
Views: 623

Re: Recommended Soldering Iron for 5AWG?

Best soldering iron for wiring that size is no soldering iron, it's just not the right technique for connections at that scale.

Best option is to invest in a hydraulic crimper - they can be had pretty cheaply from ebay etc. I love mine.
by Ohbse
Apr 09 2019 6:29pm
Forum: E-Bike General Discussion
Topic: 21kw+ QS273 won't outrun a 250cc?
Replies: 38
Views: 1882

Re: 21kw+ QS273 won't outrun a 250cc?

mobipus 72200, asi bac8000 controllers i suspect will give better results(just from trawling,not personal experience yet) me i like smaller light bikes with good power/weight ratio over big heavy tanks...going over 100 on highway gets boring fast anyway. id be maybe ditching the kelly, changing bat...
by Ohbse
Apr 09 2019 5:18pm
Forum: Stand-up E-scooters and E-skateboards
Topic: I fear no man. But that ...thing. it scares me.( Thunder dual motor).
Replies: 11
Views: 1244

Re: I fear no man. But that ...thing. it scares me.( Thunder dual motor).

I rode one of these a couple of weeks ago - I know what you mean with regards to throttle response, it's pretty wild/non-linear. This thing would be SO much better with decent quality controllers with proper torque throttle. Dual Nucular 12fet would be ideal. My other observation was that with the d...
by Ohbse
Apr 01 2019 11:01pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Scratch built 33" Kicktail Monocoque longboard
Replies: 11
Views: 969

Re: Scratch built 33" Kicktail Monocoque longboard

Wow that looks good with the glossy varnish finish. Nicely done! I like the idea of having your cover held on by magnets, so convenient. And because its so convenient, completely removes the need for externally mounted power button, charge port, ect. Could always install some kind of retaining brac...
by Ohbse
Mar 31 2019 6:02pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Scratch built 33" Kicktail Monocoque longboard
Replies: 11
Views: 969

Re: Scratch built 33" Kicktail Monocoque longboard

So with the exception of the motor wiring that penetrates the deck right at the rear edge of the battery enclosure, there are zero holes or external controls at all. It has no power button, no external charge connector - the flipsky vesc powers itself on after the wheels move only a few inches and t...
by Ohbse
Mar 31 2019 5:30pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Scratch built 33" Kicktail Monocoque longboard
Replies: 11
Views: 969

Re: Scratch built 33" Kicktail Monocoque longboard

Woops didn't spot I had a reply :) CAD/CNC is a hobby for me but a business for my wife - I built the router myself, most of the mechanical stuff is kit from CNCrouterparts, but I ended up doing all the motion control/wiring etc from scratch. Day job I run datacenters in various places round the wor...
by Ohbse
Mar 24 2019 11:20pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 2517

Re: DIY HI POWERED PACK: First time, General questions

Jonathan1981 wrote:
Mar 23 2019 1:52pm
anyone have experience with these?
Good, but not quite as good as the 30q
by Ohbse
Mar 21 2019 6:59pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 2517

Re: DIY HI POWERED PACK: First time, General questions

it would be awesome to find a cheap mold-able material the could do that. I was thinking something like mixing aluminum powder into a soft two part epoxy and molding a thin layer around each cell?..... thoughts, links etc???? just trying to think of a cost effective DIY cooling solution for such a ...
by Ohbse
Mar 18 2019 7:41pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 4118
Views: 330877

Re: Sur-Ron - New Mid drive Bike

Now is this 4000 the controller that motomoto was working with ASI to tune or is this another controller version. It seems like they realized themselves, the 8000 is just stupidity. There is simply not enough space in the frame to power it reliably. You will need ultra short lived lipo to power it ...
by Ohbse
Mar 18 2019 5:06pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5284
Views: 210601

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The majority of NZ is rolling green hills with sheep and cows grazing. An enormous quantity of this could have very large turbines installed on the higher hills and have zero appreciable impact to the primary function of feeding agriculture. Quibbling over power density is utterly pointless when the...
by Ohbse
Mar 17 2019 6:06pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 2517

Re: DIY HI POWERED PACK: First time, General questions

your personal experience is not valid for this use case. this is a motorbike, not a scooter or ebike. 17km is done in less then 9 minutes with a motorbike on a highway. the >average< load for a motorbike is around 5kW. with your battery that would mean 70A continous (5.8A per cell). well into the r...
by Ohbse
Mar 11 2019 10:08pm
Forum: Battery Technology
Topic: DIY HI POWERED PACK: First time, General questions
Replies: 60
Views: 2517

Re: DIY HI POWERED PACK: First time, General questions

29e vs 30q is hardly a competition, the 30q is the correct cell for your defined requirements. I have built many packs with 30q - the one on my daily bike is 20s12p, I hit discharges of 160 amps every day. Peak pack temperature is <30c at conclusion of my journey of ~17km. This pack has done >18,000...
by Ohbse
Mar 02 2019 9:25pm
Forum: E-Bike General Discussion
Topic: Best controller to use with qs 205?
Replies: 58
Views: 2962

Re: Best controller to use with qs 205?

Yes I am, Samd from Ballarat ebikes is great to deal with, I purchased mine through him and he can assist with product queries. Yes, the Mobipus supports flux weakening, massively extending the speed range. I run with it disabled as my motor is quite a fast wind anyway being 3.5T. I have run this up...