Search found 4034 matches

by Punx0r
Apr 26, 2018 2:57 am
Forum: General Discussion
Topic: Self Driving Uber Kills Pedestrian
Replies: 111
Views: 2488

Re: Self Driving Uber Kills Pedestrian

Couple of interesting short statements from other self-driving / driver-assistance system manufacturers on this collision: In a related development, the chief of Intel's rival self-driving programme suggested its Mobileye tech would have prevented the accident. "We ran our software on a video feed c...
by Punx0r
Apr 26, 2018 2:49 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

There are no legitimate objections you can make - the science is well settled. Everything has been accounted for and the variables defined to a good degree of accuracy. Real-world data has repeatedly been shown to match predictions/models. Whether you realise it or not, you are just repeating alread...
by Punx0r
Apr 26, 2018 2:45 am
Forum: Battery Technology
Topic: Tesla module charging to full/degradation
Replies: 1
Views: 21

Re: Tesla module charging to full/degradation

AFAIK the cells are charged to the same voltage (I believe it is a little lower than 4.2V) whether the pack is new or old. The pack will just take on less charge and give less on discharge as it ages (and make more heat doing so).
by Punx0r
Apr 26, 2018 2:39 am
Forum: Alternative Energy
Topic: Biomass to Fuel?
Replies: 12
Views: 127

Re: Biomass to Fuel?

The IMO is targeting 50% reduction in CO2 for commercial shipping by 2050, but this has been criticised as being unambitious. Analysis showed a 90% reduction should be possible. As stated above, slower speeds (comparable to sailing vessels) make a huge difference. I did laugh a while ago when I saw ...
by Punx0r
Apr 25, 2018 2:02 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 350
Views: 18384

Re: Tesla Model 3

Seems like in that scenario you are paying for a lot of battery that you will never use, and have to lug around for the vehicles' lifetime.
by Punx0r
Apr 25, 2018 6:37 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 350
Views: 18384

Re: Tesla Model 3

You cannot achieve 200kWh @ 1000kg using 750 Hobbyking lipo packs because it would contain quite a few dud packs and burst into flames before you'd finished assembling it, which would dramatically reduce the weight, but also the capacity.
by Punx0r
Apr 24, 2018 2:56 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 350
Views: 18384

Re: Tesla Model 3

So 1000 kg seems to me to be achievable at that time. Yes it is still lot of mass but Roadster 2 will have advanced three motor configuration with torque vectoring. This kind of powertrain have possibility to almost "switch off" the problem of high mass in modern electric vehicles. It will be very ...
by Punx0r
Apr 24, 2018 3:06 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Please make the stupid stop :cry:
by Punx0r
Apr 21, 2018 5:24 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 350
Views: 18384

Re: Tesla Model 3

I thought the advantage of induction motors over BLDC was lower cost due to the lack of rare-earth magnets? Torque density for BLDC is supposed to be greater than induction. Increasing the number of components in a battery (or any system) ought to decrease reliability, but I was under the impression...
by Punx0r
Apr 21, 2018 4:53 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Magazine feature by Octopus Group investment group in the UK. They have fingers in many pies but have an arm for energy projects. The leader of this group says RE is the future and that the intermittency of wind & solar is not a major problem and can be solved with battery storage and load managemen...
by Punx0r
Apr 21, 2018 4:27 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

In 2017 Denmark met 44% (14.7 TWh) of its annual electricity demand with wind power: https://cleantechnica.com/2018/01/06/44-wind-denmark-smashed-already-huge-wind-energy-records-2017/ It's targeting 50% by 2020 with solar and biomass taking the total to 80% generated from RE. Closer to home, the UK...
by Punx0r
Apr 21, 2018 3:31 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Now ,..how about a real scientific experiment that can prove conclusively what the world climate will do with increasing co2 ? and presumably your assertion is that CO2 has no effect on global temperature? Can you produce even a single piece of even semi-scientific research to support that? if you ...
by Punx0r
Apr 20, 2018 3:24 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 350
Views: 18384

Re: Tesla Model 3

They also have a huge edge in the cost of battery manufacturing where as the others have to outsource adding a huge cost. True, the gigafactory is their ace card at the moment. I think they will need to keep innovating or die - keep pushing the tech. Performance they have pretty much nailed, but ne...
by Punx0r
Apr 19, 2018 5:21 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Stop trolling. You cannot possibly be that ignorant or misinformed.
by Punx0r
Apr 19, 2018 9:32 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

"known" fossil fuel reserves are (obviously) known. The CO2 released from burning them is known. The warming effect of raised CO2 on the planet is known. The projection of warming based on further CO2 is predictable to a good degree of confidence. This is established science. Refuting it will requir...
by Punx0r
Apr 19, 2018 9:26 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 350
Views: 18384

Re: Tesla Model 3

I see the biggest challenge to Tesla being the existing large ICE car manufacturers. Now the EV drivetrain is become mature and components & systems being offered by OEMs, it's becoming easier for them to nail together an effective EV and leverage their considerable existing manufacturing experience...
by Punx0r
Apr 19, 2018 3:23 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Very true. The security for a nuclear plant and the fuel & waste supply chain must be a nightmare if you need to prevent a terrorist attack or theft. It also happend that they needed imports during very hot summers. Often some nukes are in maintainace mode during summer and when it is hot and dry fo...
by Punx0r
Apr 18, 2018 10:01 am
Forum: Large EV General Discussion
Topic: XING Mobility Miss R - Electric Supercar Concept
Replies: 6
Views: 147

Re: XING Mobility Miss R - Electric Supercar Concept

What's the crack with immersion cooling of pouch cells? From what I've read, tab cooling is 3x more effective than cold plates sandwiching the cell, due to the terrible thermal conductivity through the cell layers. So even with liquid cooling, unless the tabs are also submerged it wouldn't be very e...
by Punx0r
Apr 18, 2018 9:57 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

So for $10billion according to that Wikipedia page you get a 2.4GW/2400MW nuclear reactor like in Belarus...If we could build x2.8 Belarus power stations for the $2.8billion a year over ten years $28billion dollars than ideally we could have 2.8x 2400MW = 6720MW or 6.72GW nuclear power-station roug...
by Punx0r
Apr 18, 2018 9:42 am
Forum: Motor Technology
Topic: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+
Replies: 53
Views: 3573

Re: Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

But at only 500 RPM and same 14kW, the power should be limited to about 2kW on the shaft to stay within the specs. Check how much power your motor actually outputs at 500rpm - it will be a lot less than 14kW! As a sense check I would take motor stall torque, multiply by driver pulley radius and che...
by Punx0r
Apr 17, 2018 7:35 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

20°C (70°F) and sunshine here and everything is growing. February is usually about the time it stops going down to freezing at night. We're much further North than New York as well (similar latitude to Quebec and Moscow), thanks solely to the Gulf Stream. If Artic warming continues there is a real d...
by Punx0r
Apr 16, 2018 7:49 am
Forum: E-Scooter and Motorcycle General Discussion
Topic: EU Road Legal Electrification (???)
Replies: 13
Views: 1189

Re: EU Road Legal Electrification (???)

Could you have the bike tested/certified in another country (where the rules are more friendly to one-off vehicles) and "import" it to your home country? I have known people from the UK who lived in an EU country, but used their UK car and didn't register it in their new home country. The only requi...
by Punx0r
Apr 16, 2018 4:33 am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

OK, I concede, you two are correct. The only way to prevent storms bringing down power lines and causing a blackout is to burn coal. Driving a generator with a propeller instead of a steam turbine clearly just doesn't work and it never will. I imagine the wildfire currently ripping through Sydney is...
by Punx0r
Apr 15, 2018 5:31 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1865
Views: 50464

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Well if that's the case why don't you quote the passge from an official report to the effect of "the inherent unreliability of wind turbines was a major contributor", or "if SA had had 100% coal generation a blackout would not have occured"? Because it seems pretty clear to me the root cause was win...
by Punx0r
Apr 15, 2018 11:29 am
Forum: Battery Technology
Topic: How to measure -60V to 1000V
Replies: 15
Views: 680

Re: How to measure -60V to 1000V

I guess anything grid-related they're used to kV so don't think twice about using it. However, I imagine it's actually a different kettle of fish with a battery system because it's always "live" unless cleverly designed with multiple contactors/disconnects to break up the series string.