Power in Flux

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Podbuilder replied to the thread Podbuilder.
" Chargery's reply. "your consideration is correct, DCC is built-in arc-suppression circuit, generally, the DCC should be installed on the positive, but the DCC has mosfet, don't drive it on positive." So on the negative wire it goes. "

5 Hours Ago

Tig Cross replied to the thread Electrom LEV.
" sorry. duplicate. "

6 Hours Ago

Podbuilder replied to the thread Podbuilder.
"
Quote Originally Posted by Spoonman View Post
Hmm... from the reading of that it appears that it has some form of built-in inrush limiting, so it's not out of the question that it has TVS in there too but it doesn't say anything about it which I'd expect it would.

That being said, I don't see a break rating in there either which suggests to me that this thing is only designed to be used to open and close under no-load conditions - as long as that's the case then you can put it wherever you like.
The potential to induce an inductive response it linked solely to opening operation while the circuit is under load; so turning off the ignition which accelerating or decelerating hard basically. Even in that circumstance, if the break rating is low you may well find that the magnetic aligning force on the contacts simply won't let the circuit release until you're below the danger zone (this won't be by design, more a function of not being designed as a 'breaker').
Lots to take in here. I better read up on contactors so I have a better understanding of there specs. They are sold in differing amp ratings so you'd assume he's selling a functional product. But I'll ask the questions. I dont wish to damage a $600 controller. "

8 Hours Ago

Podbuilder clicked Likes for this post: Podbuilder by Spoonman

8 Hours Ago

Stevo clicked Likes for this post: Electrom LEV by Tig Cross

9 Hours Ago

Tig Cross replied to the thread Electrom LEV.
" Hi Stevo, thanks for the questions.
The Electrom is running a 72 volt, 40 amp-hour pack.
32 kph is the top legal speed for e-bikes here, but it can go much faster.
at 32 kph it has a range of 200 kilometers
at 40 kph it has a range of 180 kilometer.
at 45 kph it has a range of 150 kilometers.
This is all on flat ground. Of course in hilly terrain the range goes down, but the regenerative brakes help salvage a fair amount of energy in that situation.
The top speed is 65 kp/h with a full battery.

Speed is set via throttle so pedalling is not necessary, but as long as one is sitting around one might as well get some exercise.

The generator is rated as a 300 W, but can handle much more in short bursts. I can put out just over 600W for about 30 seconds, 150W all day. this generator is actually overkill as we regular humans can only put out about 150W continuously, but it was the smallest I could find that put out the required voltage at the RPM needed. "

9 Hours Ago

Richard230 clicked Likes for this post: Chevy crate motor by Spaceweasel

9 Hours Ago

Richard230 replied to the thread Harley's new bike.
" More likely this illustrates H-D's ability to stick their brand on any sort of Chinese-made product. I wonder if they will offer Screaming Eagle accessories for their e-bike? Such as a 100-watt CD player, bar end tassels and a beer can holder, along with Screaming Eagle playing cards to attach to the spokes. "

9 Hours Ago

Stevo replied to the thread Chevy crate motor.
" I think this is awesome news... with all of the unemployment, this gives some talented garage entrepreneurs a possible way to make some money. "

11 Hours Ago

Stevo replied to the thread Electrom LEV.
" What is the battery pack specs and vehicle range. I'm curious about the generator's output as well. What happens if you don't pedal at all? "

11 Hours Ago

Spaceweasel created the thread Chevy crate motor.
" I know, I know - not a bike. But the idea of a crate motor conversion kit is pretty cool.

https://arstechnica.com/cars/2020/10...lt-ev-hotrods/ "

12 Hours Ago

Tig Cross created the thread Electrom LEV.
" Hi Everybody, Here's an update on my project, the Electrom.LEV.

http://www.electrom.ca/wp-content/up...ed-for-web.jpg

The Electrom is an e-bike that has been designed from the ground up to offer as many of the conveniences of an automobile as possible while still legally remaining a bicycle. It can carry 100 liters of cargo or a small passenger, the Electrom also offers some weather protection for the rider as well as all of the lights and turn signals you would expect to find on a motorcycle. At the heart of the Electrom is the Generator & Chain Drive which allows the rider to pedal at a constant speed without having to shift any complicated bicycle gears.

At just 24 inches wide the Electrom can easily slip past stalled traffic like a bicycle and when you arrive at your destination you can park it anywhere you can park a bicycle.

The Electrom is designed to last with an aluminum frame and custom molded fiberglass and carbon fiber body parts. It has very few moving parts and uses mostly off-the-shelf bicycle components available in any bike shop.

Generator & Chain Drive system (GCD)
The Electrom uses a unique Generator & Chain Drive system (GCD). The GCD acts like an automatic transmission for a bike.

How it works:
The rider's energy is split and goes via two separate drive chains to both an on-board generator as well as to the back hub motor with one very low gear. The rider can help the motor get the vehicle get up to speed and to climb steep hills with direct pedal energy, but when the vehicle exceeds 15 kph The chain drive to the back wheel is in freewheel mode and all of the rider’s energy goes to the generator. The rider can just pedal at a constant cadence free from the need to think about gears while exercising and producing electricity to supplement the battery.

Benefits of the GCD system:

No Gears - It allows the rider to pedal all the time at a constant effort without the need to shift gears to match the human energy to the speed the vehicle is traveling. This is especially advantageous in stop-and-go city situations. An additional benefit is that as the Electrom has a top speed of 60 kph (electronically governed to match local laws) it would need a huge range of gears if it used a conventional drive train.

Choose your effort - Because the rider can pedal as little or as much as they want, they have the choice of working hard and sweating, or pedalling at a gentle pace with efforts similar to walking. This is a nice feature if one is on their way to work in an office situation. An added benefit of the Generator Drive system is that when the rider encounters a hill too steep for the motor to manage, the vehicle slows down to 15 kph and the freewheel engages so the rider’s energy returns to the back wheel to help the motor get the Electrom up the hill.

High quality exercise - Because the rider’s efforts are independent from the speed of the vehicle, they can pedal all the time agains a constant resistance, even when going down steep hills or slowing down. This makes for a superior quality of exercise. The Electrom’s peddling station is mounted high enough off the ground that there is no possibility of pedal-strike on tight corners which adds to the time one can spend pedalling.

Low maintenance - While the GCD may sound complex, the mechanisms that make it work are quite simple and time-tested. Because the drivetrain is under very little stain it does not stretch or wear out like a conventional bicycle drive-train and requires very little maintenance.

https://vimeo.com/434763216 "

12 Hours Ago

Spoonman replied to the thread Podbuilder.
" Hmm... from the reading of that it appears that it has some form of built-in inrush limiting, so it's not out of the question that it has TVS in there too but it doesn't say anything about it which I'd expect it would.

That being said, I don't see a break rating in there either which suggests to me that this thing is only designed to be used to open and close under no-load conditions - as long as that's the case then you can put it wherever you like.
The potential to induce an inductive response it linked solely to opening operation while the circuit is under load; so turning off the ignition which accelerating or decelerating hard basically. Even in that circumstance, if the break rating is low you may well find that the magnetic aligning force on the contacts simply won't let the circuit release until you're below the danger zone (this won't be by design, more a function of not being designed as a 'breaker'). "

15 Hours Ago

Spoonman replied to the thread Harley's new bike.
" Interesting move.

This quote is promising:
"Entering the electric bicycle business underscores efforts to remake Harley-Davidson into a more nimble company that reacts quickly to market conditions and consumer preferences."

This line is entirely laughable:
"...combines Harley-Davidson’s world-class product development capability and leadership in two-wheel electric propulsion..." "

15 Hours Ago

Richard230 created the thread Harley's new bike.
" Here is the latest new bike from H-D: https://www.usatoday.com/story/money...nd/3746133001/ "

17 Hours Ago

Podbuilder clicked Likes for this post: Podbuilder by Spoonman

19 Hours Ago

Podbuilder replied to the thread Podbuilder.
"
Quote Originally Posted by Spoonman View Post
Breaking on the negative pole has the potential to induce an inductive response on the upstream side of the circuit if you interrupt while there's significant current flowing.
As such I wouldn't recommend it.

Breaking on the positive pole on the other hand basically leads to brownout in the downstream systems which definitely preferable.

If you're stuck with breaking on the negative pole then I'd put in some appropriately rated clamping(TVS) diodes to in there so that any such spikes don't exceed the ratings of any other connected hardware.
I'm trying to determine if I am stuck or if I can fit it to the positive lead or it has suitable safety hardware built in. I bought a BMS24t which looked good with all the bells and whistles and within my budget. They also offered a DCC300 contactor that replaces two contactors. I only realised after the fact I shouldnt have a circuit breaker on the negative side which the DCC unit suggests. It does say it has inbuild safety protection but Im yet to get an answer from the owner. There's a link if you're interested in having a read. "

20 Hours Ago

Spoonman replied to the thread Podbuilder.
" Breaking on the negative pole has the potential to induce an inductive response on the upstream side of the circuit if you interrupt while there's significant current flowing.
As such I wouldn't recommend it.

Breaking on the positive pole on the other hand basically leads to brownout in the downstream systems which definitely preferable.

If you're stuck with breaking on the negative pole then I'd put in some appropriately rated clamping(TVS) diodes to in there so that any such spikes don't exceed the ratings of any other connected hardware. "

20 Hours Ago

Podbuilder clicked Likes for this post: Podbuilder by Stevo

22 Hours Ago

Stevo replied to the thread Podbuilder.
" I don't know the answer. My contractor is on the B+ side and I'm using a Sevcon. I have no experience with Kelly.

Sent from my Pixel 3 using Tapatalk "

1 Day Ago