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NadineJ
User Rank
Platinum
Re: Coils of copper - tempting?
NadineJ   10/30/2013 3:23:54 PM
NO RATINGS
@shehan-I think if we all really thought about the effect of our decisions on the community as a whole, no one would be so desperate.  We'd take care of one another.

Today, it's a luxury to think about the big picture.  If your kids are hungry, you only think about feeding them--any way you can.

shehan
User Rank
Gold
Re: Coils of copper - tempting?
shehan   10/30/2013 2:58:24 PM
NO RATINGS
@jmiller – At times we feel ashamed that we are living in a society surrounded by thieves. Imagine someone stealing a manhole cover and selling it. This indicates that this equipment is definitely in danger. 

shehan
User Rank
Gold
Re: good alternative
shehan   10/30/2013 2:56:14 PM
NO RATINGS
@jmiller – They could develop a billing system to ensure that only people who pay can use this service. I'm sure you can't give it to the public for free. The equipment cost and the power consumption needs to be recovered. 

shehan
User Rank
Gold
Re: Coils of copper - tempting?
shehan   10/30/2013 2:51:40 PM
NO RATINGS
@NadineJ – I think it's important to think of the society and how stealing an equipment like this will affect the community as a whole. 

EVprofessor
User Rank
Gold
Re: Devil is in the details
EVprofessor   10/28/2013 6:59:04 PM
Leto, you said,"2 points on AL instead of Copper.
1st Copper is a better conductor than AL theirfore using AL will increase wasted energy as heat.  Opposite of making things more effecient.
2nd Mixing AL and copper is deadly if not done right it is a fire waiting to happen.  If done properly it is safe but a # of home fires happen every year from these 2 materials improperly mixed in wiring."

Sorry, you are not wrong. But, the reported data is flawed.

First, aluminum is less expensive and it is also a good conductor, one simply uses a thicker conductor to increase conductivity. In that way aluminum is just as efficient as copper for wiring.

Secondly, careful attention to detail is required but it is improper connections which are the problem, I have made many aluminum/copper connections and mine have Never failed however I have seen overheated connections in pure copper wire systems if they were not properly assembled. Electrical wiring is no hobby, become properly trained or hire someone who is properly trained. I expect a lot of home fires are the result of flawed copper home wiring. And considering the much greater usage of copper over aluminum the copper is likely the cause of more fires than the aluminum.

LetoAtreidesII
User Rank
Platinum
Re: chicken before the Egg
LetoAtreidesII   10/28/2013 6:25:33 PM
NO RATINGS
It accommodates your house but the average load will go up and out off sustainable under current system. Yes they should build more plants but regulators and greenly and local groups keep stopping them. California could even build a solar plant in the desert for fear of hurting a lizard. This my hole point we need to get capacity increased before we go he'd long down the EV path EV is the future but we are not ready yet on so many fronts and blind faith in it will not solve the engineering challenges ahead of us You other gas kW is just bogus run the numbers and you get each refinery requires a large nuke plant just to provide the power

J. Williams
User Rank
Platinum
Re: chicken before the Egg
J. Williams   10/28/2013 6:16:49 PM
NO RATINGS
The problems with the grid that increased wind and solar generation has more to do with the stability of the grid not the capacity of the system.  Paul Mauldin has very succinctly captured what the future for California might look like if steps are not taken to mitigate the issue.  As wind and solar generation ramps up and down over the course of a day, the base load generation will have relatively severe slew rates to accommodate the customer loads.

http://tdworld.com/generation-renewables/solar-will-shine-brighter-smarter-inverters 

Look at the slope of the red line in the graph.  This is the load changes that will be required of the conventional generating sources.  Here are some more articles alluding to the grid stability issues that result from large scale PV and wind generation.

http://tdworld.com/generation-renewables/grid-friendly-utility-scale-pv-plants 

http://tdworld.com/generation-renewables/can-smart-solar-keep-sun-shining-pv 

http://tdworld.com/generation-renewables/wind-power-making-it-play-nice-no-breeze?page=1 

Cheers !

 

EVprofessor
User Rank
Gold
Re: chicken before the Egg
EVprofessor   10/28/2013 6:02:08 PM
NO RATINGS
EXCUSE ME, my switching scheme alternates between charging and the major cooling load automatically so both can be acomodated into the future. The electric cars are not yet here (Only 200,000 os a small fraction of the 300 Million that are coming in the next 10 years.) Obvously the utilities need to upgrade the grid because of growth in consumer consumption already. Don't try to blabe the electric cars the grid is being overloaded NOW what are the utilities waiting for (More free taxpayer grant funding?) It is time to cut back on dividends and upgrade the grid NOW! And it is NOT the electric cars as only 0.06% of the automobiles presently in the USA. 

Kindly consider that the gasoline refinery requires energy to refine the gasoline from crude oil, in fact about 7.5 KWhrs of electric power is needed to operate the refinery in producing each gallon of gasoline produced. My electric car can drive over 25 miles for 7.5 KWhrs of electric energy, without using any gasoline but your car may get about as far from that gallon of gasoline. Don't you see we used as little electricity to power the electric car as the refinery used to refine the crude oil into gasoline for you to use driving your gasoline burning car the same distance, and we didn't need to import and burn the crude oil or gasoline refined from it either. I still say it is not the electric cars, it is the failure of the elecrtic utilities who need to cut back on dividends and upgrade the antequated grid at their own expense.

Charles Murray
User Rank
Blogger
Re: good alternative
Charles Murray   10/28/2013 6:02:06 PM
NO RATINGS
Same here in the Midwest, Ann. Pure EVs are still an unusual site, but conventional hybrids are everywhere and I'm starting to see an occasional plug-in hybrid, like the Volt.

J. Williams
User Rank
Platinum
Re: NO! NO! NO! and NO! - Is That Clear
J. Williams   10/28/2013 5:48:20 PM
NO RATINGS
I can believe the number.  I'm sure it was a trade-off between durability and efficiency and cost.  Pick any two.  I doubt rust would have been an issue because I am almost certain the core material would have been some type of ceramic ferrite which doesn't rust.  However, if the ferrite was "brought to the surface" of the paddle to reduce the air-gap, it would be more susceptible to physical damage as the ferrites are very brittle.

Electrical connectors are almost universally the weakest point in all electronics.   Eliminate connectors and your reliability goes up.  A lot.

I'm not a particular fan of wireless charging schemes but I also know well the pains that connectors and connections can cause in electrical systems.

I could design you a paddle charging system with about 90-95% efficiency, but I am certain it wouldn't meet any of the manufacturing cost targets and the users would probably not like the ease of paddle insertion/extraction necessary to reduce losses due to fringing. 

Like everything else in this world, TANSTAAFL.

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