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by fechter
Oct 21 2021 4:16pm
Forum: EBike Build Threads
Topic: Around the world on a solar ebike
Replies: 333
Views: 58204

Re: Around the world on a solar ebike

Looking great so far. I hope the weather stays ok for you. It’s raining pretty hard here.
by fechter
Oct 21 2021 12:35pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2203
Views: 151595

Re: la Nina rears her ugly head

2.1" since yesterday here. Off to a good start. The atmospheric river event is still coming this weekend.
by fechter
Oct 21 2021 11:41am
Forum: Battery Technology
Topic: BMS Question.
Replies: 5
Views: 129

Re: BMS Question.

Awesome thank you, your explanation has helped me alot. Also does the BMS have to be the same voltage or higher then the pack itself? The 60a bms that I am searching up are all coming back 48v when my cell is 51.8 You want one made for 14 series Li-ion cells. Ignore the voltage. When searching, put...
by fechter
Oct 20 2021 3:01pm
Forum: EBike Technical
Topic: Power consumption sweet spot
Replies: 11
Views: 160

Re: Power consumption sweet spot

Snow is pretty bad for range but good for motor cooling :wink: If you have a meter that measures motor power or current, you can instantly see the results of speed, hills, snow, etc. As Chalo points out, if you pedal hard enough, your range will be unlimited. When you have hills or stiff head winds,...
by fechter
Oct 20 2021 8:48am
Forum: Battery Technology
Topic: BMS Question.
Replies: 5
Views: 129

Re: BMS Question.

BBSHD is limited to 30A stock. You should look for a BMS that is rated for at least 50A or so and have a balancing function. There are some fancy bluetooth programmable ones and some very simple basic ones. Personally, I like the simple ones. There are also "common port" and "split po...
by fechter
Oct 20 2021 8:25am
Forum: EBike Technical
Topic: Power consumption sweet spot
Replies: 11
Views: 160

Re: Power consumption sweet spot

Power consumption will be a function of speed. The slower you go, the more range you will get (down to about walking speed).

You can use the Grin motor simulator to estimate your range for various speeds:
https://ebikes.ca/tools/simulator.html
by fechter
Oct 20 2021 8:13am
Forum: EScooters/EMotorcycles
Topic: Sur-Ron - New Mid drive Bike
Replies: 5562
Views: 661543

Re: Sur-Ron - New Mid drive Bike

I feel fortunate I was able to get moped plates for mine. I have insurance and don't ride like an idiot. I've been pulled over once, but when I pointed out the plates and told him it was electric, he got back in the car and drove off.
by fechter
Oct 20 2021 8:07am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2203
Views: 151595

Re: la Nina rears her ugly head

Finally, some measurable rain. About 0.2". It's a start. Last measurable was back on March 19. That's a really long dry spell. Forecast is looking hopeful. Rain or chance of rain every day for the next week. I'm looking forward to riding my bike in the mud. I'm tired of the dry, dusty trails. M...
by fechter
Oct 19 2021 2:33pm
Forum: EScooters/EMotorcycles
Topic: USB TTL HELP e-bike
Replies: 5
Views: 199

Re: USB TTL HELP e-bike

It's hard to say from the picture, but it resembles the old "Infineon" boards. Check out this topic:

viewtopic.php?f=2&t=27927&hilit=infineon
by fechter
Oct 19 2021 1:08pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2203
Views: 151595

Re: la Nina rears her ugly head

Latest NWS model indicates an "atmospheric river" is forming and aimed in my direction. Over the next week, they are predicting up to 5" of rain here. That would be half of what I got all of last season. If this happens, it should put out all of the fires from here north.
by fechter
Oct 18 2021 11:39pm
Forum: EScooters/EMotorcycles
Topic: USB TTL HELP e-bike
Replies: 5
Views: 199

Re: USB TTL HELP e-bike

What kind of controller is it? Does it have any markings?
by fechter
Oct 18 2021 11:38pm
Forum: EBike Troubleshooting
Topic: Surron throttle not usable for slow speed
Replies: 9
Views: 149

Re: Surron throttle not usable for slow speed

Most standard hall throttles will work with the Sur-ron. I've had both torque and speed command throttles and each has it's advantages. It does take some getting used to. One other thing that may be worth trying is tweaking the throttle zero. If you need to advance the throttle more than a tiny amou...
by fechter
Oct 18 2021 8:15am
Forum: EBike Non-hub Motor Drives
Topic: Can only set BBSHD to 28amps max?
Replies: 14
Views: 1680

Re: Can only set BBSHD to 28amps max?

Was wondering if anyone knows of an "unlocked" version of the firmware that would permit changing of the max amps, sped etc. From what I understand there is an opensource version of the firmware, I just don't know how likely it is to brick the controller. Was hoping for something fairly s...
by fechter
Oct 17 2021 6:37pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2203
Views: 151595

Re: la Nina rears her ugly head

They're saying La Nina is officially back and should last through spring. This means more rain up north, less rain down south and about normal where I am. La nina.JPG Normal would be great at this point. The forecast here is looking hopeful. It would be the first measurable rain in about 6 months. 1...
by fechter
Oct 17 2021 12:01pm
Forum: EScooters/EMotorcycles
Topic: USB TTL HELP e-bike
Replies: 5
Views: 199

Re: USB TTL HELP e-bike

There are usually pads on the board somewhere. I don't see them in the picture, but probably somewhere else. Look for pads marked RX and TX. You will also need the right software to talk to the controller.
by fechter
Oct 17 2021 11:45am
Forum: EBike Troubleshooting
Topic: Surron throttle not usable for slow speed
Replies: 9
Views: 149

Re: Surron throttle not usable for slow speed

Yes, the controller behaves like it has "speed command", so even the slightest change in throttle can give a full power surge. It seems worse when the speed limiting is engaged. It does take some getting used to. What you want is a "torque command" throttle so a small sudden incr...
by fechter
Oct 14 2021 8:07am
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 578
Views: 35167

Re: C Cab Hot Rod Power Advice

If you went direct drive from the motors to the wheels, it could probably go too fast (downhill), but you need the gearing to prevent overloading the motors. If the gearing is too tall, the motors will never get close to their no-load speed on flat ground and most likely overheat. You'd lose a lot o...
by fechter
Oct 13 2021 3:03pm
Forum: E-Vehicles General Discussion
Topic: C Cab Hot Rod Power Advice
Replies: 578
Views: 35167

Re: C Cab Hot Rod Power Advice

It depends on the controller. Most inexpensive controllers will have a "speed command" where the motor speed is a direct function of the throttle setting. With the wheel off the ground or chain removed, the motor RPM should be directly proportional to the throttle. When starting out from a...
by fechter
Oct 13 2021 2:28pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12760

Re: DIY Toroidal Axial Flux PM

Very cool. When I steal your design I plane on using electric steel laminations for the jig fins and leaving them in when potting the stator. That's what I was thinking would be a good idea. Similar to the Lynch motor. You would still have some iron losses, but much less than a conventional stator....
by fechter
Oct 10 2021 12:06am
Forum: EBike Non-hub Motor Drives
Topic: Bafang ultra upgrade to 2500watt
Replies: 130
Views: 41691

Re: Bafang ultra upgrade to 2500watt

Looks like one for each phase and two parallel for the battery.
by fechter
Oct 05 2021 3:55pm
Forum: Motor Technology
Topic: First e-bike build: Need help diagnosing motor/controller problem
Replies: 3
Views: 134

Re: First e-bike build: Need help diagnosing motor/controller problem

If it's a geared hub motor and the controller is spinning it backwards, it will make noise but not drive the wheel.

Try some other hall/phase combinations. Don't give full throttle unless it sounds like it's running properly.
by fechter
Oct 05 2021 7:59am
Forum: General Discussion
Topic: Eternal outskirts of Moscow and beyond (LOTS of pics!)
Replies: 406
Views: 24981

Re: Eternal outskirts of Moscow and beyond (LOTS of pics!)

Nice. Thanks for posting. Soon it will all be covered with snow.
by fechter
Oct 05 2021 7:53am
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 2203
Views: 151595

Re: la Nina rears her ugly head

They were talking about a chance of rain this Friday, but now I see they took that out of the forecast.
I hope the showers down south hit that big fire. The smoke has been making it up here.
by fechter
Oct 04 2021 10:30am
Forum: EBike General Discussion
Topic: Can i tap charging lead to draw small power for light?
Replies: 5
Views: 203

Re: Can i tap charging lead to draw small power for light?

I use the charging input on my pack to run my electric air pump. As mentioned above, there would be no protection against over discharge and the maximum current you can pull will be in the ballpark of what the charger puts out. 18w should be no problem.
by fechter
Oct 03 2021 11:01am
Forum: Battery Technology
Topic: Thread for new battery breakthrough PR releases
Replies: 1765
Views: 278854

Re: Thread for new battery breakthrough PR releases

I think some of the weld-free packs done on the forum here look better than theirs. I'm still not convinced that weld-free compression packs will hold up long term. There will either be corrosion on the contacts or the ends of the cells will get dented. But I see some that have been working for a wh...