Search found 11982 matches

by fechter
Apr 19, 2018 1:22 pm
Forum: Battery Technology
Topic: Battery charge port:
Replies: 2
Views: 45

Re: Battery charge port:

Yes. I have tried it and it works. The charge port can't handle a lot of current, but the pump takes less than 2A. There is no protection for low battery or over current using that port, but it shouldn't be a problem for the amount of time it takes to pump a tire.
by fechter
Apr 19, 2018 1:18 pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 765
Views: 27927

Re: la Nina rears her ugly head

Our chance last night evaporated before it hit the ground, so zero in the rain gauge. Back to sunny, warm weather, which I am ready for.
by fechter
Apr 19, 2018 1:15 pm
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3136

Re: Supercapacitors vs batteries. Capacity.

Hillhater wrote:
Apr 18, 2018 6:27 pm
..if they are using those, then they have also invented "anti-gravity" !! :shock:
At 5.2 Wh/kg , it would need ~~ 700kg to give 3.55kWh capacity
I missed that. Well, I guess we can eliminate that possibility.
by fechter
Apr 19, 2018 1:11 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 61
Views: 1417

Re: Throttle Behavior

I managed to find a small Darlington transistor and tested it. 2N5308. With a 100k base resistor, it turns on right around 1.15v. This is pretty close to the desired point. I think ideally we want it to turn on at 0.95v to 1.0v. One other thought I has was if you are pedaling and hit the throttle, t...
by fechter
Apr 19, 2018 9:23 am
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 171
Views: 13756

Re: How To, 50A BBSHD Controller Mod

racingame wrote:
Apr 18, 2018 6:45 pm
Sorry for the interference, but isn't "Ludicrous" version just a Luna internal name for a controller where they switched out the shunt (and maybe also replaced aluminum case IIRC)?
Yes. It may also have a steel gear instead of the plastic one.
by fechter
Apr 19, 2018 9:21 am
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 77
Views: 989

Re: The ultimate torque arm (For <2kW and standard axles)?

Really reminds me of this story https://www.nytimes.com/2000/01/18/health/among-the-inept-researchers-discover-ignorance-is-bliss.html Anytime somebody starts bragging about how great they are, it's a red flag. What the members here have is a lot of practical experience, which I consider to be more ...
by fechter
Apr 19, 2018 9:09 am
Forum: E-Bike Reviews & Testing
Topic: A2B Metro - www.ultramotor.com - Video Page4
Replies: 404
Views: 63318

Re: A2B Metro - www.ultramotor.com - Video Page4

I'll have to find those settings on my old laptop. It might take me a while to dig them up. I think there is a setting for the throttle voltage but I don't recall having an issue with mine. Low throttle should be around 1.0v. If you see a setting for this in the programming, you want it to be lower....
by fechter
Apr 19, 2018 8:48 am
Forum: Stand-up E-scooters and E-skateboards
Topic: GOPED ESR750 Battery Question
Replies: 8
Views: 72

Re: GOPED ESR750 Battery Question

A custom 18650 pack would be fairly easy for someone with the right tools.

I think you want your pack to be able to supply 50A maximum current, not 50Ahr capacity (two different things).
by fechter
Apr 19, 2018 8:42 am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 945
Views: 47975

Re: Sur-Ron - New Mid drive Bike

The Husky looks like he has a rechargeable battery on his collar. Is he cheating?
by fechter
Apr 19, 2018 8:39 am
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 61
Views: 1417

Re: Throttle Behavior

I should really try to do more testing, but I think a 100K trimmer would be better. Temperature drift might still be an issue since the controller heats up quite a bit as you ride, but I think it will be OK. When building, I recommend attaching the CCW leg of the pot to the ground side so that turni...
by fechter
Apr 18, 2018 11:21 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 61
Views: 1417

Re: Throttle Behavior

I used a 2N5550 I just happened to have lying around and simulated that part of the circuit on a breadboard. The single 100k base resistor will be pretty close, but I don't know the exact threshold where the PAS will inhibit. I know what a pain it can be to dial in a pot. One reason I like the 10 tu...
by fechter
Apr 18, 2018 7:18 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 61
Views: 1417

Re: Throttle Behavior

OK, good news on the testing. In reviewing the datasheet for the transistor, it seems the super simple circuit with one resistor might have issues with temperature drift. The first one with two resistors will be better in this respect. The easiest thing would be to use a 20k trimmer pot in place of ...
by fechter
Apr 18, 2018 2:35 pm
Forum: Stand-up E-scooters and E-skateboards
Topic: GOPED ESR750 Battery Question
Replies: 8
Views: 72

Re: GOPED ESR750 Battery Question

That battery is a little weak for the ESR750. Ad states 15A continuous. You should look for something that can do 50A. By replacing the lead bricks with lithium batteries, you could probably triple the range and reduce the weight quite a bit. What are the dimensions of the battery compartment? Or me...
by fechter
Apr 18, 2018 1:53 pm
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3136

Re: Supercapacitors vs batteries. Capacity.

Here is a datasheet from Maxwell for a new product they call a "Pseudocapacitor"
https://www.mouser.com/ds/2/257/CE_2017 ... 274211.pdf

These may be what they are using.
Pseudocap.JPG
Pseudocap.JPG (98.33 KiB) Viewed 21 times
by fechter
Apr 18, 2018 1:14 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 77
Views: 989

Re: The ultimate torque arm (For <2kW and standard axles)?

Alan B wrote:
Apr 18, 2018 9:12 am

This is all interesting to think about, but the reality will not be known until tested. Even with the best engineers and simulations, rockets require testing, and things don't always go as planned.
rocket-explosion.jpg
rocket-explosion.jpg (101.77 KiB) Viewed 150 times
by fechter
Apr 18, 2018 8:23 am
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 33
Views: 949

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

Most MPPT controllers are made for stationary panels and have a really slow response to changes. This might be a problem for a moving bike. Maybe there's a way to speed up the response? If the panels are just run to the pack directly it will probably be rare they need to be disconnected due to full ...
by fechter
Apr 18, 2018 8:09 am
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 contoller PCB parts replacement questions
Replies: 2
Views: 52

Re: BBS02 contoller PCB parts replacement questions

Here's a picture of the area on an un-fried one. But it's a bad sign the inductor burned up. This generally means the voltage regulator was trying to feed full pack voltage into the 12v supply and something downstream fried, possibly including the 5v regulator. You could try replacing the parts, but...
by fechter
Apr 17, 2018 4:05 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 61
Views: 1417

Re: Throttle Behavior

I see blue. It should be possible to tap into the wire there. When I want to tap into a wire like that, I try to keep the copper intact and carefully cut the insulation in the desired spot, then just push the insulation back to expose some of the copper. Solder tap wire and tape. It might be a while...
by fechter
Apr 17, 2018 3:58 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Nova Cruz Voloci Re-vamp
Replies: 83
Views: 12657

Re: Nova Cruz Voloci Re-vamp

I was thinking about this a little today. All these parts are regular Tomos brand moped items. Do you think they would work at 12vdc. You would think thats what it steps down to anyway. I will try it out on one of the crappier bikes. Yes, I think the on-board dc-dc converter outputs 12v for the lig...
by fechter
Apr 17, 2018 3:55 pm
Forum: E-Bike General Discussion
Topic: Voltage boosters
Replies: 3
Views: 130

Re: Voltage boosters

I've seen a few people try them. The amp ratings given are generally exaggerated quite a bit. If you get one "rated" for about double what you want and use a cooling fan, it might work OK.
by fechter
Apr 17, 2018 3:01 pm
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 33
Views: 949

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

That's quite a long ride. And through some pretty dangerous territory. And HOT. Using the solar panels for shade will be a really good idea. Getting lost along the way could be bad. Congratulations on getting married. Just make sure you both come back in one piece. Here's a link to the technical rul...
by fechter
Apr 17, 2018 2:39 pm
Forum: E-Bike General Discussion
Topic: Alternate bbs02 switch ?
Replies: 5
Views: 94

Re: Alternate bbs02 switch ?

I had to look it up to see what you're talking about. PAS shifter.jpg Several others have wished for something similar to work with a Bafang. A crude way might be to take a regular grip shifter and remove the cable and springs, then attach a rod to the moving part that makes contact with the stock B...
by fechter
Apr 17, 2018 2:21 pm
Forum: Battery Technology
Topic: The poor mans cycle satiator
Replies: 14
Views: 631

Re: The poor mans cycle satiator

what mods did you do? can you make a picture from the inside? these meanwell clones come is a few versions. That's an understatement. I've seen dozens of different layouts. Current limit adjustment. 2K pot across this resistor: Current Limit.jpg Increase voltage adjustment range to 60V. 2K across t...
by fechter
Apr 17, 2018 2:05 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Throttle Behavior
Replies: 61
Views: 1417

Re: Throttle Behavior

Yes, on mine the throttle signal wire is blue.
BBSHD Throttle Signal Wire.jpg
BBSHD Throttle Signal Wire.jpg (110.87 KiB) Viewed 49 times
by fechter
Apr 17, 2018 12:56 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Nova Cruz Voloci Re-vamp
Replies: 83
Views: 12657

Re: Nova Cruz Voloci Re-vamp

I'm not sure about the Voloci, but many early ebikes could be 'spoofed' by feeding 36v to the key switch line but use 48v to the main controller wires. If you measure the voltage on the key switch, you might get an idea. A little 48v to 36v dc-dc converter would go downstream of the switch. In the o...