Search found 4942 matches

by Punx0r
Mar 19 2020 3:50am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The way we all waste energy at the moment with 20% efficient cars and badly insulated houses there is plenty of scope for more expensive energy that we just use less of. Sure, but how do you cook your breakfast at midday, cook dinner before you finish work, take your morning shower after you start w...
by Punx0r
Mar 17 2020 4:21am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

..........providing you accept that converting coal plants to burn wood Biomass is “renewable” and carbon neutral ? But if you consider that there can never be enough trees to generate electricity from,..or that trees are better used for carbon sequestration,...then the picture is little changed in...
by Punx0r
Mar 16 2020 11:14am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

If we're talking electricity rather than energy, by the end of 2019 the UK was at: 40% renewable (20% wind, 6% solar, 12% biomass) 39% fossil fuel (38% gas, 1% coal) ~20% nuclear 10 years ago it was: 80% fossil fuel (40% gas, 40% coal) ~20% nuclear https://www.theguardian.com/business/2019/oct/14/re...
by Punx0r
Mar 16 2020 4:10am
Forum: Motor Technology
Topic: 60kW 400V EV Motor Controller
Replies: 6
Views: 1030

Re: 60kW 400V EV Motor Controller

It was running from 3-phase 400V AC mains but I think it could also take a lower voltage single phase AC input and boost the voltage and convert to 3 phase. No idea if it could take a DC input - suspect it might but it wasn't in the manual. It was a WEG unit. IGBT based thing.
by Punx0r
Mar 15 2020 6:41am
Forum: Motor Technology
Topic: 60kW 400V EV Motor Controller
Replies: 6
Views: 1030

Re: 60kW 400V EV Motor Controller

I'm pretty sure the last 3 phase 400v industrial induction motor drive I messed with could also drive permanent magnetic motors via a sin/cos resolver. It was about 30kW and about the size of 1.5 shoe boxes
by Punx0r
Mar 15 2020 5:33am
Forum: General Discussion
Topic: Bitcoins
Replies: 288
Views: 51512

Re: Bitcoins

Image
by Punx0r
Mar 13 2020 8:33am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Yes, it is an expensive gamble but one worth taking IMO due to the huge potential payoff. The chance of a dead end or two is part of R&D.

Next gen nuclear may be quicker/cheaper to build but that's a) to be established yet and b) not ready yet, so you need to factor in the additional delay.
by Punx0r
Mar 12 2020 7:15pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The ITER timeline is probably realistic due to the scale of the challenges. I'd love to see a working prototype plant in my lifetime. All other obstacles aside, I have seen it claimed that there simply isn't enough time or skilled workers to build even traditional fusion at rate sufficient to effect...
by Punx0r
Mar 12 2020 7:07pm
Forum: E-Vehicles General Discussion
Topic: France bans illegal eMTB tuning with fines up to € 30,000
Replies: 39
Views: 3273

Re: France bans illegal eMTB tuning with fines up to € 30,000

"the dyno result is 251 watts - bring out the guillotine!"
by Punx0r
Mar 11 2020 8:27am
Forum: General Discussion
Topic: Need help with 80v Greenworks/Kobalt/Stiga chainsaw speed controller
Replies: 16
Views: 1215

Re: Need help with 80v Greenworks/Kobalt/Stiga chainsaw speed controller

My guess was going to be a simple thermistor return in the "dumb" battery to the controller in the "smart" tool to provide battery temperature protection, but if it's a PWM signal serving some purpose or other that's a bit of a nuisance. You might be able to salvage the board from a dead battery and...
by Punx0r
Mar 10 2020 8:35am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6282

Re: Electric Racing Chainsaw Build, Help Please

Boo. Although I wonder if doing so would exceed some design safety margin or whether they know from experience it will instantly grenade...
by Punx0r
Mar 10 2020 4:03am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 21
Views: 2026

Re: How to disassemble motor adapter from sprocket/freewheel?

Or a pair of digital or vernier calipers and a good eye
by Punx0r
Mar 10 2020 4:02am
Forum: Motor Technology
Topic: Hunstable HET Electric turbine
Replies: 10
Views: 896

Re: Hunstable HET Electric turbine

If it does work then it perhaps neatly answers the question of whether flux from end turns in a normal radial motor produces torque or not. I mean, it doesn't, but in the past certain people have insisted it does. There'd presumably be no point to this "HET" design if end turns normally did useful w...
by Punx0r
Mar 10 2020 3:51am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

An urbex video of an old paper mill and a video of people fighting over toilet paper. The rubbish that has been repeatedly posted in this thread by certain members is both saddening and annoying. But in the new world of every opinion being of equal value, of the "balanced" debate and the principle o...
by Punx0r
Mar 10 2020 3:44am
Forum: E-Vehicles General Discussion
Topic: France bans illegal eMTB tuning with fines up to € 30,000
Replies: 39
Views: 3273

Re: France bans illegal eMTB tuning with fines up to € 30,000

The earliest commonly cited speeding fine for a motor vehicle is from 1896 in Kent, England where the driver was doing 8mph in a 2mph limit. I'm sure I've seen an earlier one from Germany, though, where the driver's speed was simply stated as being so furious it caused the curtains of a nearby build...
by Punx0r
Mar 08 2020 6:18am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Oil and gas prices were high due to demand and, particularly, speculative investors, not because they were inherently expensive, scarce or difficult to produce. Prices for both collapsed after the crash and there was a glut on the market.
by Punx0r
Mar 08 2020 6:10am
Forum: General Discussion
Topic: Fatal ebike crash trial
Replies: 31
Views: 3012

Re: Fatal ebike crash trial

Hmm, you mean in Australia and elsewhere, passengers can be consuming alcohol having a grand old time while traveling in the vehicle so long as the driver passes the blood test? Yes, but most countries as well as far as I know. Here the old bill would take a dim view of a driver swigging from a can...
by Punx0r
Mar 07 2020 5:32pm
Forum: General Discussion
Topic: Fatal ebike crash trial
Replies: 31
Views: 3012

Re: Fatal ebike crash trial

That "open containers" law is AFAIK a peculiarly U.S. thing
by Punx0r
Mar 07 2020 5:56am
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 2408

Re: Adding capacitors for long battery wires

Ebike style controllers already have plenty of onboard capacitors. It's the smaller, RC style controllers that don't
by Punx0r
Mar 06 2020 2:39pm
Forum: E-Vehicles General Discussion
Topic: Adding capacitors for long battery wires
Replies: 30
Views: 2408

Re: Adding capacitors for long battery wires

They do, but your cells are not at risk - it's the controller out there on the other end of the wires on it's lonesome. That's why any caps have to be as close to the controller as possible.
by Punx0r
Mar 06 2020 3:20am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Yes, look what your thirst for iphones, stained glass and computer hard drives has done to the environment. Fortunately research in the fields of renewable energy means wind turbines and EV motors and batteries don't NEED rare earth elements.
by Punx0r
Mar 05 2020 10:01am
Forum: General Discussion
Topic: Electric Racing Chainsaw Build, Help Please
Replies: 129
Views: 6282

Re: Electric Racing Chainsaw Build, Help Please

Looks like a good candidate. Any idea on pricing and availability?
by Punx0r
Mar 05 2020 3:39am
Forum: E-Bike Technical
Topic: How to disassemble motor adapter from sprocket/freewheel?
Replies: 21
Views: 2026

Re: How to disassemble motor adapter from sprocket/freewheel?

They're all listed in the link I posted above
by Punx0r
Mar 05 2020 3:36am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 6137
Views: 338690

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Is this a Trump-esque strategy? Just a fact based on data. I didn't say it. Richard Heinberg said it in the essay I quoted above. Among many others. Some of Heinberg's work: https://scontent-ort2-2.xx.fbcdn.net/v/t1.0-9/s960x960/66509664_2296655167080249_866029981430448128_o.jpg?_nc_cat=101&_nc_sid...
by Punx0r
Mar 05 2020 3:16am
Forum: General Discussion
Topic: Fatal ebike crash trial
Replies: 31
Views: 3012

Re: Fatal ebike crash trial

The punishments for cycles are usually lower than for motorised vehicles: the drink drive limit doesn't apply, you just have to not be shitfaced, running red lights, going wrong way down a one-way street, cycling on the pavement(sidewalk) carry a fixed fine of £50.