Search found 1869 matches

by billvon
Apr 25 2019 1:29pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

Cephalotus wrote:
Apr 25 2019 1:52am
This makes a nice comparison but is entirely irrelevant for the ecological impact of Tesla cars, as long as this solar power is not used to charge or produce Tesla cars.
Only if you ignore the emissions caused by driving the car. Those are real and they are significant.
by billvon
Apr 24 2019 11:55pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

cricketo wrote:
Apr 24 2019 10:35pm
That last part is incredible in its own. If I'm not mistaken, the number I've seen was something like 97% motor efficiency. Did you catch it anywhere, is that accurate ?
Well, keep in mind that going from 335 to 370 is only a 10% improvement, so a few percent per subsystem gets you there.
by billvon
Apr 24 2019 10:30pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

I'm sure people will drive different conclusions based on their preferences. Tesla is still the the leader with the best products on the market within each category. Two other bits that will get the haters going: Tesla has released a CO2 impact report detailing their generation of CO2 and mitigatio...
by billvon
Apr 24 2019 10:18pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Shooting the messenger again bill ? Doing the research to understand who the source is. Let's say someone posted an article by Al Gore. How would you react? PSI did not do the study.. ..they simply reported the Swedish Royal Institute of Technology (KTH) research findings. You didn't read the artic...
by billvon
Apr 24 2019 8:30pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

..... New science from Sweden proves oil comes naturally from rocks: Until now these believers in “abiotic oil” have been dismissed as professing “bad science” but — alas — a new study has proven them correct! PSI is an organization that claims that CO2 is a global cooling gas. Even prominent clima...
by billvon
Apr 24 2019 1:50pm
Forum: Battery Technology
Topic: BMS with lipo's
Replies: 2
Views: 55

Re: BMS with lipo's

I have the chance to get some single cell lipo prismatic cells. I will be making a 20s3p pack. Yes. From a BMS voltage threshold perspective, lipos are close enough to lithium ion that you can generally use the same BMS. (Currents of course vary from cell type to cell type, even between two differe...
by billvon
Apr 24 2019 12:30pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

If the video is real, then it was way more than just a few cells going off. Normally you see a pack burn much more slowly where one or two cells at a time are venting and it propagates from cell to cell. Perhaps. A lot depends on how the pack is built. If it relies on solid heatsinking to move heat...
by billvon
Apr 24 2019 11:10am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

Doubt it. Usually 1 cell ignites then another but the modules in a Model S are separate to make a smaller fire. So its more likely you will see some smoke then a small fire then a big fire if all the modules ignite. In an 18650 battery pack without protection (eutetic material between cells, very p...
by billvon
Apr 24 2019 10:59am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Pure speculation and idealism ! So "EVs are improving" - speculation. "Oil will last forever" - fact. You're a funny guy. I dont think that bill, ( you have trouble following discussions, dont you. ?).....that is the GND/IPCC/CAGW , brain fart. Nope. It is your claim. You have to take AOC's comment...
by billvon
Apr 23 2019 10:35pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Except that in 10 years you will still be producing even more EVs with the same “pre-polution” issue Nope. As time goes on, production costs (represented by energy) will go down dramatically, even if you assume your BS claim about "10 years worth of CO2" is valid (which it isn't.) The CO2 content o...
by billvon
Apr 23 2019 7:07pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Ignoring your “credit card” attempts to distract from the CO2 question.....You are saying then,..that its better to dump 10 years worth of CO2 into the atmosphere in one dose now, rather than the same amount progressively over 10 years ? Yes - if, in ten years, you can stop dumping altogether. That...
by billvon
Apr 23 2019 12:31pm
Forum: Electric Aircraft
Topic: Manned multirotor
Replies: 14
Views: 1120

Re: Manned multirotor

amazingdiyprojects wrote:
Apr 21 2019 3:07am
There is still headroom on the throttle but when flying the vehicle it is apparent that air resistant becomes a significant counterpart around 50km/hand the overall flight efficiency drops.
Thanks for the update.

Might a pusher prop allow a lower-drag presentation during higher speed flight?
by billvon
Apr 23 2019 12:27pm
Forum: Electric Aircraft
Topic: Manned multirotor
Replies: 14
Views: 1120

Re: Manned multirotor

How am I clueless? It's way too sketchy, otherwise you would do some real flying and not just skim along the ground. And you are 100% reliant on sketchy electronics that are not human rated and not designed to be. Sure you can tolerate 1 flight controller failing but what about 2? Could you tolerat...
by billvon
Apr 23 2019 11:30am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

No.. its not “like” that... It is exactly like that. With new credit cards, you can just keep spending, and don't have to worry about them until much later! What could go wrong? And with climate change, you can just pass your credit card bills off to your kids. No one wants to hear "no, you have to...
by billvon
Apr 23 2019 11:27am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Just what % of junked Tesla cells end up in Ebikes or BESS systems ?? Take a guess ... a realistic one , not a fantasy .... i will bet its less than 5% of the Mod S packs Tesla? Not sure, never looked into it, other than the ones I have. Given how quickly they fly off the shelves here there's a pre...
by billvon
Apr 22 2019 4:10pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

You can go to one of many scrap yard/insurance sites and see 100's of Tesla's that have been in an automobile accident with only a few thousand miles on the odometer, so these cars never got to displace an ICE vehicle's hoped equivalent emissions over time . . . Instead, those junked batteries go i...
by billvon
Apr 22 2019 1:19pm
Forum: E-Bike Technical
Topic: Bike shuts down after 10 mins of use until I recharge it.
Replies: 6
Views: 134

Re: Bike shuts down after 10 mins of use until I recharge it.

I have a pack of 3 batteries. How does it work exactly? For example, if one of the battery is faulty, can it just be removed from the pack? Also, what are the chances that the 3 batteries would be dead at the same time? Are they getting drained equally? 3 of what kind of batteries? Are they somethi...
by billvon
Apr 22 2019 1:03pm
Forum: Motor Technology
Topic: Thyristor-based load switching
Replies: 9
Views: 139

Re: Thyristor-based load switching

cricketo wrote:
Apr 21 2019 11:40am
Solid-state contactors are built on thyristors though, correct ?
AC contactors (SSR's) are built with thyristors; DC contactors are built with FETs or IGBTs.
by billvon
Apr 22 2019 12:30pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

But it doesnt matter because those batteries have made their CO2 contribution , all at once, in full, before they even turn any wheels....whilst the ICE will spread its CO2 over its lifetime . So if you believe the CO2 “crisis” needs action NOW...not in 10 years time,..then the ICE is the best choi...
by billvon
Apr 22 2019 10:57am
Forum: E-Bike Technical
Topic: Bike shuts down after 10 mins of use until I recharge it.
Replies: 6
Views: 134

Re: Bike shuts down after 10 mins of use until I recharge it.

Hello, The title is pretty self explanatory. After recharging my bike, the bike runs fine for about 10 mins then stops. It won't work until I charge it again (works at the second I put it on charge as well). I've been using this bike for aout 4 years for about 1500 kms a year. Your BMS is probably ...
by billvon
Apr 20 2019 9:43pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

A new study from Germany reconfirms what a lot of us already know, a battery pack in a Tesla is so big that its manufacture is about 10 years worth of co2 emissions pre-emitted before you start driving. Yep. I got a laugh on another forum about how EV's were killing everyone because of all the radi...
by billvon
Apr 20 2019 9:40pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 862
Views: 49947

Re: Tesla Model 3

Funny : From the article: ============ The Audi e-tron, once dubbed by avid Tesla critics as a potential “Tesla Killer,” is reportedly running into production problems due to a constrained supply of batteries and a slower-than-expected delivery of electric motors. These production problems have rep...
by billvon
Apr 20 2019 9:35pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Hogwash. The rule of regression to the mean suggests that to the nearest approximation, everybody's kid will be a liability. And to look at the world as it is, that's absolutely true. Definitely. But by the law of averages, looking at our lives compared to human history, we are all dead anyway. Not...
by billvon
Apr 19 2019 12:34pm
Forum: E-Bike Technical
Topic: TO-220 FETs (De)Soldering Technique
Replies: 3
Views: 93

Re: TO-220 FETs (De)Soldering Technique

Does anybody have experience with (de)soldering TO-220 MOSFETs and what is your favorite technique? 1) Cut the leads flush with the boards. 2) Reflow the solder on the remnants of the leads. 3) Slam the board against a piece of wood. Momentum will carry the lead out and should leave the thru-hole o...
by billvon
Apr 19 2019 11:29am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 3744
Views: 135625

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Frankly, I'm not surprised you find people turned off if they're repeatedly told we're all going extinct because fossil fuels are running out and there is no possible replacement. There is no possible replacement that is as cheap, as portable and as available as quickly. There are lots of possible ...