Search found 14780 matches

by fechter
Jan 17 2021 12:23pm
Forum: Battery Technology
Topic: BMS modding for more current
Replies: 35
Views: 6212

Re: BMS modding for more current

I've done something similar with pieces of heavy copper wire. It helps.
by fechter
Jan 17 2021 12:18pm
Forum: E-Bike Build Threads / Photos & Video
Topic: A2B Metro (Gen 1) Restoration and Upgrade
Replies: 35
Views: 958

Re: A2B Metro (Gen 1) Restoration and Upgrade

Are you going to try using the stock motor?
by fechter
Jan 16 2021 12:37pm
Forum: E-Bike Build Threads / Photos & Video
Topic: 3000w Mongoose girder
Replies: 22
Views: 764

Re: 3000w Mongoose girder

markz wrote:
Jan 11 2021 4:41pm
I laugh every time I see that video of the guy losing his shoe.
I need to find the specs for the monster! The big gear on the rear wheel.
Video says 50,000 mid drive, 2012 Francisco Ebike HIll Clmb race.
Will do another search later.
It was a Zero motorcycle motor.
by fechter
Jan 16 2021 12:31pm
Forum: General Discussion
Topic: Why a Co2 Laser PS has high voltage insulation only on the positive?
Replies: 8
Views: 138

Re: Why a Co2 Laser PS has high voltage insulation only on the positive?

It usually means the negative side of the power supply is grounded or close to ground. There will be HV between the positive and negative terminals regardless, but inside the power supply, one side may be connected to ground. If you had a HV meter, you could measure this.
by fechter
Jan 15 2021 9:31am
Forum: Large EV General Discussion
Topic: 1967 Ford Econoline Leaf conversion
Replies: 2
Views: 86

Re: 1967 Ford Econoline Leaf conversion

That's a real fixer-upper. I'll be interested to see how it turns out. I like the snowmobile thingy but I guess it's not electric (yet).
by fechter
Jan 15 2021 9:27am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Sondors x new bike the Metacycle
Replies: 36
Views: 573

Re: Sondors x new bike the Metacycle

At least it looks pretty cool. We'll have to wait until somebody (we trust) actually test rides one. There's room in the frame for more batteries :wink:
by fechter
Jan 13 2021 3:30pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1922
Views: 140482

Re: la Nina rears her ugly head

No rain here for at least a week. Possible record daytime highs this weekend. I may need to turn the irrigation system back on. :confused:

Where's El Nino when you need it?
by fechter
Jan 13 2021 9:19am
Forum: E-Vehicles General Discussion
Topic: Series Hybrid Drive - into a commuter velomobile?
Replies: 15
Views: 299

Re: Series Hybrid Drive - into a commuter velomobile?

If your pedal generator has an efficiency of 90% and the motor has an efficiency of 90%, the overall will be 81%. In practice it's hard to find generators with higher than 90% efficiency (including any gearing). Most I've seen are much worse. If you spend a LOT of money you might be able to build so...
by fechter
Jan 12 2021 11:06pm
Forum: Battery Technology
Topic: SUNKKO 709A Modifications (for example wrong voltage product)
Replies: 4
Views: 88

Re: SUNKKO 709A Modifications (for example wrong voltage product)

There is a topic about this here somewhere. I think it can be done.
by fechter
Jan 12 2021 11:03pm
Forum: E-Vehicles General Discussion
Topic: Series Hybrid Drive - into a commuter velomobile?
Replies: 15
Views: 299

Re: Series Hybrid Drive - into a commuter velomobile?

Even using the best motor and generator out there, the losses in a series hybrid system are terrible compared to a regular chain drive. You could design with enough battery that you really don't need the pedal input and just use it to get exercise and slightly extend the range. Another idea might be...
by fechter
Jan 12 2021 12:56pm
Forum: Battery Technology
Topic: Charge Daly BMS through discharge port, Still balances?
Replies: 18
Views: 842

Re: Charge Daly BMS through discharge port, Still balances?

I am a bit new to this subject. When the contributors are taking about charge and discharge ports how does this work with say these Daly BMS`s that have only a B- & a P- connections. As these BMS`s do not have a C- connection all charge and discharge takes place both ways in the B-/P- Wires. Is...
by fechter
Jan 11 2021 10:45pm
Forum: General Discussion
Topic: Retirement Time
Replies: 330
Views: 51356

Re: Retirement Time

nicobie wrote:
Jan 11 2021 4:44pm
Broken link? :cry:
I think I fixed it.
by fechter
Jan 11 2021 4:19pm
Forum: General Discussion
Topic: Retirement Time
Replies: 330
Views: 51356

Re: Retirement Time

We could make that electric wheel chair go waay faster. :twisted:

Like this:
by fechter
Jan 11 2021 3:35pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1370
Views: 122986

Re: APL's DIY axial-flux motor

Looking very nice. If the last pin is too tight, you might try cooling the edge of the disk with dry ice to make it shrink a little.
by fechter
Jan 08 2021 10:55am
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 148
Views: 38358

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

That's it. Just unplug it.
There is usually a little blob of silicone holding the plug but you can just pull hard and it will tear or you can slice it with a blade first.

If you're sure you won't ever want it again, you can also just snip the grey wire and leave the plug in.
by fechter
Jan 07 2021 10:55pm
Forum: E-Bike Technical
Topic: switch relay from 5V on the throttle connector.
Replies: 4
Views: 126

Re: switch relay from 5V on the throttle connector.

The 5v regulator output current is the important spec. The controller is going to use some, but varies quite a bit between models and also depends on what the controller is doing. 10mA on top of whatever the controller takes should be OK. Ones I've measured were something like 70mA peak but average ...
by fechter
Jan 07 2021 12:53pm
Forum: E-Bike Technical
Topic: Ego batteries.
Replies: 2
Views: 127

Re: Ego batteries.

Yes.
Just be very careful not to cross any wires.

The Ego batteries have some kind of serial communication with the charger and tools that is proprietary.
by fechter
Jan 07 2021 12:41pm
Forum: E-Bike Technical
Topic: switch relay from 5V on the throttle connector.
Replies: 4
Views: 126

Re: switch relay from 5V on the throttle connector.

The 5v supply in a typical controller can't supply much current. If you get a really sensitive relay, it might work. A solid state relay would be better but they are a bit more expensive.
by fechter
Jan 07 2021 12:37pm
Forum: General Discussion
Topic: Why my lights, tv, and everything else isn’t flickering.
Replies: 7
Views: 239

Re: Why my lights, tv, and everything else isn’t flickering.

Capacitors. Most AC powered things rectify the AC to DC and the filtering capacitors smooth the DC so there won't be any flicker. This does not apply to most lights that I have taken apart. They still flicker. The phosphorus in a fluorescent lamp reduces the flicker somewhat, as does the filament in...
by fechter
Jan 07 2021 12:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue
Replies: 148
Views: 38358

Re: DIY Fix for BBS02/BBSHD Pedal/Throttle Issue

It's pretty easy to open the side cover and simply unplug the PAS sensor. This disables the PAS completely and gives normal throttle response. I rode this way for about a year. If you want PAS later, you can reconnect the plug.
BBS02 PAS.jpg
BBS02 PAS.jpg (13.12 KiB) Viewed 102 times
by fechter
Jan 07 2021 10:55am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 1922
Views: 140482

Re: la Nina rears her ugly head

0.8" since last weekend. Looking for another 0.1" or so on Friday, then they say there will be a long dry period.
We need more rain! At least riding conditions will be great for a while.
by fechter
Jan 06 2021 11:20pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1370
Views: 122986

Re: APL's DIY axial-flux motor

Epoxy sticks great to titanium. Not so sure about the core material, but it's mostly iron so should stick well to that also. I've reworked several motors that were potted with some kind of epoxy. At 100c, the epoxy got rubbery and soft enough to break out easily with a small screwdriver. The wire in...
by fechter
Jan 06 2021 9:09am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1370
Views: 122986

Re: APL's DIY axial-flux motor

The idea with the pins would allow to disassemble the cores again from the plate, but was wondering why it have to be like this? I would keep it simple and glue the cores with epoxy to the plate after cutting slots. Not a bad idea. One issue is most epoxy types get pretty soft when hot. This could ...
by fechter
Jan 05 2021 10:53pm
Forum: Battery Technology
Topic: Battery to battery charging
Replies: 13
Views: 490

Re: Battery to battery charging

Parallel should be OK for identical units. You'd want to dial in the voltage of each one separately before paralleling the outputs. If one is off a little, it won't matter. Another setup I've seen is to just use a big 12v - 120vac inverter on a car (or truck) and run the engine while charging. Proba...
by fechter
Jan 05 2021 10:41pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 5342
Views: 592204

Re: Sur-Ron - New Mid drive Bike

Nice. It should last a long time in the snow. Maybe you can clear your driveway with it?