Search found 858 matches

by Ohbse
Feb 19 2020 1:42pm
Forum: EV Business World
Topic: GM retreating into its shell ?
Replies: 36
Views: 3001

Re: GM retreating into its shell ?

Right... 90k income - Aus $22,597. NZ $21,871. You are familiar with the function of numbers right? I would have paid $3500 more in Aus this year, not including all the other ways Australia essentially taxes people, health insurance, car registration, mandatory vehicle insurance which are all an ord...
by Ohbse
Feb 19 2020 3:22am
Forum: EV Business World
Topic: GM retreating into its shell ?
Replies: 36
Views: 3001

Re: GM retreating into its shell ?

Small economies like Au have to have high taxes unless they have large trade surplus from natural resources like Oil, Gas, coal, Iron ore , etc. If you limit or eliminate the exploitation of those resources , you can expect even higher taxes. Mate, you post a lot of bollocks - but this takes the ca...
by Ohbse
Feb 17 2020 1:03pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1528
Views: 164873

Re: Nucular electronics - complete kit for ev! [beta]

100% buy the 12f. For what you're doing you will want the phase amps, power limit doesn't matter so much.
by Ohbse
Feb 08 2020 7:27pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10559

Re: Motortrend article with tons of info about Tesla’s Cybertruck

DSG gearboxes are great but I suspect will be expensive timebombs when a lot of these cars get to 10 years old. It'll probably end up being the case that if it goes wrong most people will scrap the car. I've also observed that approx 1990-2005 or so was a good period for cars in terms of refinement...
by Ohbse
Feb 08 2020 2:20am
Forum: Alternative Energy
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6413
Views: 363077

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Likely not economic to reuse, given how much larger newer wind turbines have become. There's also been a lot of iterative improvement in blade profile over the last 15 years.
by Ohbse
Feb 07 2020 9:17pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Observed trials bike designing
Replies: 104
Views: 8824

Re: Observed trials bike designing

Sounds cool. Not sure you're going to have enough phase amps or response out of the Kelly to snap the front wheel up though, they're known for being underwhelming on low end torque and low speed throttle response.
by Ohbse
Feb 07 2020 8:13pm
Forum: E-Bike Technical
Topic: Ebikes are they AC, DC or?
Replies: 56
Views: 2927

Re: Ebikes are they AC, DC or?

That said there are both BL AC motors and BL DC motors. 3 phase BL DC is "pulsed" direct current not to be confused with alternating (BL AC) current ... https://www.motioncontrolonline.org/products/ac-brushless-motors.cfm Not really true and somewhat confuses the issue further. AC inducti...
by Ohbse
Feb 06 2020 4:59pm
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

No, again, your graph is meaningless. The % figures you reference have ZERO bearing on how this works.

Forget you ever read the table with those figures as they have literally nothing to do with calculating lifespan, efficiency, power etc.
by Ohbse
Feb 06 2020 3:10am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Observed trials bike designing
Replies: 104
Views: 8824

Re: Observed trials bike designing

Running a motor on a lower voltage will merely reduce its usable RPM range, plus power in the higher portions of that range. Due to the effects of bemf, you will be unable to drive the same current as RPMs increase vs if you had a higher voltage pack. The low down torque will be largely unaffected h...
by Ohbse
Feb 06 2020 3:04am
Forum: E-Bike Technical
Topic: Controller comparison Nucular 24F, Power Velocity 25
Replies: 8
Views: 672

Re: Controller comparison Nucular 24F, Power Velocity 25

+1 for the Nucular. It's the full package. Control, power, reliability, feature set, support. I'm running 500 phase 250a battery on a Surron and it's absolutely fantastic. I've owned most controller brands, in some cases many variants - this is easily the best solution for lightweight EVs (and even ...
by Ohbse
Feb 06 2020 2:36am
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

What are you talking about? 3a doesn't kill a 30q. The percentages you're referencing mean *NOTHING* Read my previous post, look at the graph - what you're describing is utterly meaningless. I spent my journey with WILDLY varying power from -13,000 watt to +4000 watt under regenerative braking, vary...
by Ohbse
Feb 06 2020 1:31am
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

a cell is designed to work a certain way, if you putt around in a hot rod car at 900rpm, its going to start to run like crap and carbon will start to build up and eventually it will stall. samething with a battery if its running at 100% the matrix inside is working the way its supposed to. if a 30q...
by Ohbse
Feb 06 2020 1:18am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Observed trials bike designing
Replies: 104
Views: 8824

Re: Observed trials bike designing

It's impossible to replicate the functionality of a clutch, having the ability to dump that stored energy near instantly is pretty killer - but I think you could get pretty close with enough of a reduction ratio. I've got a Nucular 24f, I think it's absolutely fantastic. Votol/Kelly/etc are absolute...
by Ohbse
Feb 06 2020 12:54am
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

It's not relevant - measurement of mAh output is not the same as energy out. Higher discharges will output at a lower average voltage. The measured energy (wh) will be lower as discharge current increases due to losses.
by Ohbse
Feb 06 2020 12:36am
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

Where on earth are you getting these mysterious % figures? Any cell will deliver less energy the higher the discharge current as more is lost as heat due to cell IR. To get '100%' of a cells capacity, you should be aiming to run it at the lowest possible level of discharge. There is no efficiency cu...
by Ohbse
Feb 06 2020 12:31am
Forum: E-Bike General Discussion
Topic: MiniDyno motor test bench..scaleable 0-50kW
Replies: 33
Views: 4227

Re: MiniDyno motor test bench..scaleable 0-50kW

Awesome work Lars! How will you go about calculating the inertia? Last weekend I did a bunch of reading about doing exactly this! I came across one quite excellent solution which was an enormous AC induction motor. All of the stator copper was removed and a large hole cut in the top of the motor hou...
by Ohbse
Feb 05 2020 11:40pm
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

You're probably right - at 1c constant discharge (which yes, would be 3.0 amps) and 100% DoD cycle life will not be great. However in reality, it is impossible to actually do that regularly on an EV, or if you are - you have made a very, very bad battery pack for your requirements. Pack in question ...
by Ohbse
Feb 05 2020 11:10pm
Forum: E-Bike Technical
Topic: Ebikes are they AC, DC or?
Replies: 56
Views: 2927

Re: Ebikes are they AC, DC or?

+1 John. Here's a relevant video for precisely this discussion, measuring the output of a 3 phase brushless motor using a scope. To quote the author "Because the ESC provides a 3 phase output using a PWM signal which is then smoothed out into a sinusoidal wave because motors are a purely induct...
by Ohbse
Feb 05 2020 11:01pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10559

Re: Motortrend article with tons of info about Tesla’s Cybertruck

Im not arguing, just pointing out ..(as you confirmed) ...that there are issues and faults inevitable in any mass produced product. With cars, some issues are specific to ICEs, some are common, and some are unique to EVs As i said before, if you are trying to justify an EV on the basis of fewer fai...
by Ohbse
Feb 05 2020 10:48pm
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

Each time you clarify, it makes it significantly more confusing... A 30q that is cycled at 1a output will last for longer than one that's cycled at 3amps which will last longer than one cycled at 10a etc. Both time spent discharging AND number of cycles over its life. Put another way, a 30q that com...
by Ohbse
Feb 05 2020 10:34pm
Forum: E-Bike Technical
Topic: Ebikes are they AC, DC or?
Replies: 56
Views: 2927

Re: Ebikes are they AC, DC or?

So I asked a controller manufacturer. Here was my question: Hello, I was wondering what is coming out of a controller like my 8080h. Is it DC, AC or a pwm signal? Thanks. And the answer: Hi, It is supposed to work with BLDC Motor with three hall sensors. PWM signal techology is used to control the ...
by Ohbse
Feb 05 2020 10:30pm
Forum: E-Bike Technical
Topic: Ebikes are they AC, DC or?
Replies: 56
Views: 2927

Re: Ebikes are they AC, DC or?

I'm guessing this is from that facebook discussion on the AC vs DC poll? DC in - PWM is used to produce AC out is the short answer. +1 though I'd add that the controller outputs pulses of DC, but the way it directs the pulses to the 3 different phases based on the commutation sequence the motor is ...
by Ohbse
Feb 05 2020 10:27pm
Forum: E-Bike Non-hub Motor Drives
Topic: Hummingbird 20kw-ish Mid-Drive Concept Bike
Replies: 26
Views: 2759

Re: Hummingbird 20kw-ish Mid-Drive Concept Bike

I quite like your supermoto inspired mockup. In some regards I really like the square, but I'm wondering if making it somewhat more fitting of the available space would be an improvement. Conceptually the bolting of variable subframes to the universal monocoque containing the battery, controller and...
by Ohbse
Feb 05 2020 8:56pm
Forum: E-Vehicles General Discussion
Topic: Motortrend article with tons of info about Tesla’s Cybertruck
Replies: 111
Views: 10559

Re: Motortrend article with tons of info about Tesla’s Cybertruck

None of these things apply to EV's! Maybe not, but EVs have their own specific issues.. https://insideevs.com/news/376037/tesla-mcu-emmc-memory-issue/ Tesla transmission replacements.. Front suspension failure Leaf batteries Transmission or suspension issues are nothing specific to EVs - plenty of ...
by Ohbse
Feb 05 2020 8:41pm
Forum: Battery Technology
Topic: 100% discharge rate capacity
Replies: 109
Views: 5709

Re: 100% discharge rate capacity

52v luna wolf pack battery 14s4p 2 battery options lg mj1 and 30q recommend if requesting 50amp bms use 30q 4p of 30q is max 12.5 amps/cell for 50 amps a 30q has a 100% discharge rate at 10 amps does luna know something theres a lot of mixed reviews of the 30q 1. Luna definitely doesn't know much a...