Power in Flux

What's on your mind?


[140]

Live Feed

Spaceweasel clicked Likes for this post: Ride Videos - Tips and Tricks by Ted Dillard

27 Minutes Ago

luciarakan created the thread EV charging station news.
" In today's newspaper is an article written by Kevin G. Hall of McClatchy Newspapers, titled "Plug-in cars add urgency to building a smart grid". The article starts with a comment that on Friday, NRG Energy opened the first fast-charging electric station at a drugstore in Dallas, which was quickly descended upon by Volts and Leafs needing a recharge. The "pumps" (which look like gas pumps) are rechargers with 480-volt DC that can add 30 miles of range to an electric car in as few as 10 minutes. (I don't even want to think what it would do to most electric motorcycles. My batteries would probably start popping like popcorn in a microwave oven.)

However, the thrust of the article is that "carmakers and manufacturers of EV chargers have agreed on a common charging system plug that will work across the wide range of equipment providers". It also compares the needed charging system infrastructure with the construction of the interstate highway system, gasoline stations and related industries that were made possible by the popularity of IC vehicles. Except building charging stations will be a whole lot easier and cheaper than what it took to establish and operate stations to dispense gasoline.

Ed Kjaer, the director of electric transportation for Southern California Edison, was quoted as saying "The moment you put a plug on a car, you've got these two titan industries coming together and supporting a customer". The alliance between utilities and carmakers will lead to numerous changes, he predicts, including a faster build of the "smart grid", which involves the use of digital technology by utilities to allow consumers real-time measures of their energy use, as well as better management by utilities of their power production and distribution infrastructure.

Dennis Beal, VP of global vehicles for FedEX, recently said that 30% of his company's fleet could be electric if batteries with a 100-mile range became commonplace.

Genevieve Cullen, VP of the Electric Drive Transportation Association, an advocacy group for electric cars says about adding plug-in cars to the transportation mix that "a small increase in efficiency translates into huge oil savings".

The first wave of EV charging stations is likely to involve the owners of buildings and national retail chains that install car-charging operations for some small economic or marketing gain. Once a critical mass is reached in production and sales of EV, advocates say, the market could build out quickly. Constructing a charging system infrastructure is orders of magnitude cheaper and easier than installing a hydrogen or ethanol infrastructure, says Mahi Reddy, CEO of SemaConnect, a company in Annapolis, MD, that makes EV chargers.

EVs are not expected to overburden the utilities that are developing the smart grid. Ed Kjaer says that "There is so much excess capacity that there are no near- or mid-term challenges. Where we think there is going to be some issue, and it will vary across the country, is really the last 50 feet", referring to the power services to homes from the neighborhood transformers. Sherif Marakby, director of electric-vehicle programs for Ford Motor, shares that view.

My personal feeling is that if Oil companies have any smarts, they will start installing charging stations in their gasoline stations and sell junk food and cheap beer to EV owners while their cars recharge. Come to think of it, it would also make sense for the purveyors of fine fast foods to install charging stations. After all they have the parking spaces, greasy food and kid playgrounds to keep everyone occupied while the car is charging. And maybe soccer moms would appreciate charging stations at the local playground, too. The opportunities are limitless. "

34 Minutes Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
" I tried a Google search and it appears Tesla is using 2 contactors to disconnect the battery pack voltage...no mechanical switch.

Sent from my Pixel 2 using Tapatalk "

48 Minutes Ago

Ted Dillard replied to the thread VOR.WORX.EMC.v3.0.
"
Quote Originally Posted by Stevo View Post
Mike, Can you move the last few threads to the Fight Club and start a thread Necessity of a mechanical kill switch!
I will argue till I'm blue in the face about how stupid that racing rule is. If I were racing, I would wire one in just because it was required, but I'm not racing.
Seriously though...
Settle down, Sparky.

If you want to ignore a decade or so of EV design, it's your choice. I wouldn't consider running something with over 70VDC without a mechanical cutoff for the pack, and most everybody (no, everybody) I know who's built anything with that kind of voltage (ESPECIALLY for off-road use) uses one, but whatever. I have a 24yr old son, I'm used to being ignored. I'm also used to him admitting I was right when shit goes bad.

(crap, I used THREE EMOJI!!!) "

2 Hours Ago

Functional Artist replied to the thread VOR.WORX.EMC.v3.0.
"
Quote Originally Posted by Stevo View Post
Mike, Can you move the last few threads to the Fight Club and start a thread Necessity of a mechanical kill switch!
I will argue till I'm blue in the face about how stupid that racing rule is. If I were racing, I would wire one in just because it was required, but I'm not racing.
Seriously though...
If my pack goes up in flames, how is pulling a plug or flipping a switch gonna help put the fire out? I don't believe it will do one bit of good in that situation. And if there is a short in the system somewhere, the fuses will blow before I even have time to think about flippin a switch or pulling a plug.
I've always lived my life a lil on the edge, and this is a risk I'm willing to accept. If you want to wire in another possible point of failure, another possible point of water induced short, or another possible point of unnecessary resistance, go for it! But I disagree and I'll suffer the consequences if I'm wrong. I'm good with that decision.
I am not lookin' to fight, but your playin' with High Voltage & it's not just "all about you", think about the first responders. (in the case of a crash)

Look at it another way, OSHA mandates that all industrial machines have a "lockable" main power disconnect switch (located right at the main power source) in addition to "emergency kill switches". (located easily within reach of the operator)

* Since its a motor vehicle, maybe check with the NHTSA (National Highway Traffic Safety Administration) "

3 Hours Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
" I have no parasitic drain detected so far.

Sent from my Pixel 2 using Tapatalk "

3 Hours Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
" I still don't see the need. The way my system is set up, the main contactor's control cool is energized by the 12v Sevcon dc-dc, which is turned on by an isolated 12v Vicor dc-dc. If I flip the mechanical power switch to that system, the Sevcon dc-dc powers down along with main contactor. Absolutely no difference than what your suggesting to do.

Sent from my Pixel 2 using Tapatalk "

3 Hours Ago

frodus replied to the thread KwSAKI Mk1 (Ex 500).
" Mandres,
I rent the programmer, and also have been making some nice tweaks to the motor files over the last few months. It's pretty close to where I want it. I would say this combo right now is great power and people have been very happy. You would only need the programmer if you need to make changes to voltage, regenerative braking, etc. The main tuning is done. What I could do, is work out something so you get controller/motor (which includes programming) now, get it all mounted, ship to me and I'll program it with the latest I have. You just pay shipping. Or, you rent the programmer and we do it remotely.

Aggrc,
I wouldn't suggest trying to program it yourself. I'd suggest trying a starting point at the very least. The files I have should give you that. They're not a nightmare to program, you just need a good basepoint, with all the motor parameters already figured out. "

4 Hours Ago

frodus clicked Likes for this post: KwSAKI Mk1 (Ex 500) by Mandres

4 Hours Ago

frodus clicked Likes for this post: KwSAKI Mk1 (Ex 500) by aggrc

4 Hours Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
" Mike, Can you move the last few threads to the Fight Club and start a thread Necessity of a mechanical kill switch!
I will argue till I'm blue in the face about how stupid that racing rule is. If I were racing, I would wire one in just because it was required, but I'm not racing.
Seriously though...
If my pack goes up in flames, how is pulling a plug or flipping a switch gonna help put the fire out? I don't believe it will do one bit of good in that situation. And if there is a short in the system somewhere, the fuses will blow before I even have time to think about flippin a switch or pulling a plug.
I've always lived my life a lil on the edge, and this is a risk I'm willing to accept. If you want to wire in another possible point of failure, another possible point of water induced short, or another possible point of unnecessary resistance, go for it! But I disagree and I'll suffer the consequences if I'm wrong. I'm good with that decision. "

5 Hours Ago

Functional Artist replied to the thread VOR.WORX.EMC.v3.0.
"
Quote Originally Posted by Stevo View Post
Explain to me why a switch is required?
The Main Contactor will open the high current circuit when the control coil power is opened. I trust it wont fuse closed during operation. If anything, it will fail open if the control circuit fails open. Understand my logic?
#1 Emergency purposes, (like a crash) to be able to quickly disconnect the battery pack. (in an emergency)
#2 Maintenance, to be able to "safely" trouble shoot, do maintenance or repairs on the bike. (without having to manually disconnect a battery cable)
#3 Storage, to protect your battery pack (from parasitic draws, like Ted said) "

5 Hours Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
" Any number of things? Any specific examples?

Sent from my Pixel 2 using Tapatalk "

6 Hours Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
"
Quote Originally Posted by Ted Dillard View Post
ummm, I ALWAYS put a switch on the pack. It's kind of basic - you can have any number of things go wrong, and the switch lets you pull the pack offline immediately. The race bikes all require it - a big honkin' red button switch. Dice runs Anderson connectors and the one right under his knee has one of those handles on it, so he can pull it in a disaster.

I mean, if nothing else, it makes sure you won't have any parasitic losses when you park it.

Here's a post I did on switches, in particular the pack cutoff, with links to products: https://evmc2.wordpress.com/2011/01/...ectriccar-com/

Just found this too: http://www.ev-propulsion.com/disconnects.html
I despise those Anderson plugs!

Sent from my Pixel 2 using Tapatalk "

6 Hours Ago

flo replied to the thread Your "OTHER" projects.
"
Quote Originally Posted by Nicman View Post
Dynamic which what?

Sent from my SM-G955U using Tapatalk

Hi
since it would take a lot of explanation - a way to fly glider planes accumulating energy by dippin into the lee side of a hill. There is an incredible amount to be gaind. Rc gliders beeing able get up to about 500 mls/hr. Of course i am not that fast...
one of the best vids even if not at record speed:
https://www.youtube.com/watch?v=wY41yVq88mc

greets

flo "

7 Hours Ago

flo clicked Likes for this post: Your "OTHER" projects by Stevo

7 Hours Ago

Mandres replied to the thread KwSAKI Mk1 (Ex 500).
" The complexity of the Sevcon is the only reason I haven't pulled the trigger yet. I really want the performance of this combo, but not being able to make configuration changes over time or for different vehicles without splashing out on the programming kit (and an EE degree) makes me hesitate. I'm super excited to see how yours works out! "

7 Hours Ago

Ted Dillard replied to the thread VOR.WORX.EMC.v3.0.
" ummm, I ALWAYS put a switch on the pack. It's kind of basic - you can have any number of things go wrong, and the switch lets you pull the pack offline immediately. The race bikes all require it - a big honkin' red button switch. Dice runs Anderson connectors and the one right under his knee has one of those handles on it, so he can pull it in a disaster.

I mean, if nothing else, it makes sure you won't have any parasitic losses when you park it.

Here's a post I did on switches, in particular the pack cutoff, with links to products: https://evmc2.wordpress.com/2011/01/...ectriccar-com/

Just found this too: http://www.ev-propulsion.com/disconnects.html "

7 Hours Ago

aggrc replied to the thread KwSAKI Mk1 (Ex 500).
" Yes, I got the motor and controller through Travis (a real awesome dude). Travis loaded a the controller with a config so theoretically it will road out of the box assuming you have everything connected correctly. I will be taking a closer look at the programming over the next few weeks. If I was going to start from scratch programming it, best place to start would be reading the manual a few times. I keep having to go back to it and I am a good ways into this project.

Also I have no regrets with this mix of components

-Aggrc "

9 Hours Ago

Stevo replied to the thread VOR.WORX.EMC.v3.0.
" Explain to me why a switch is required?
The Main Contactor will open the high current circuit when the control coil power is opened. I trust it wont fuse closed during operation. If anything, it will fail open if the control circuit fails open. Understand my logic? "

9 Hours Ago