Search found 11429 matches

by fechter
Dec 10, 2017 6:47 pm
Forum: General Discussion
Topic: Dirt bike fork on an ebike?
Replies: 7
Views: 56

Re: Dirt bike fork on an ebike?

Double crown forks made for bikes will fit the head tube. If you can find a set of triple clamps for a bike fork that has the same diameter as a MC fork, then you could just slide the fork tubes in and go.
by fechter
Dec 10, 2017 6:35 pm
Forum: E-Bike General Discussion
Topic: hand throttle instead of pedal assist
Replies: 27
Views: 588

Re: hand throttle instead of pedal assist

From the manual: A2B Hybrid Error Codes.JPG Somewhere between the motor or sensor and display. It is probably not having a good connection on one of the pins in the connector. Inspect the pins and make sure none are damaged. Look at the sockets and make sure the metal part inside isn't spread apart ...
by fechter
Dec 08, 2017 8:22 pm
Forum: E-Bike General Discussion
Topic: hand throttle instead of pedal assist
Replies: 27
Views: 588

Re: hand throttle instead of pedal assist

That looks like a great meter (nicer than some of mine). The trick is to make contact with the lines running from the motor connector up to the display unit. The pins on the connector are very small and easy to short. If there is another connector further up the line, it might be easier to probe. Wh...
by fechter
Dec 08, 2017 8:13 pm
Forum: Battery Technology
Topic: So confused, please help (24s 99.6V battery charging/safety)
Replies: 20
Views: 260

Re: So confused, please help (24s 99.6V battery charging/safety)

Just remember that if you charge with more than one RC charger at the same time, they each need their own isolated power supply. You can't run more than one off a single supply or you will have a short (smoke, etc.).
by fechter
Dec 08, 2017 12:05 am
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 130
Views: 8323

Re: How To, 50A BBSHD Controller Mod

Which model of display is that?
by fechter
Dec 07, 2017 3:28 pm
Forum: Motor Technology
Topic: Adding hall sensors to outrunners
Replies: 422
Views: 77906

Re: Is it work if I place hall sensor head (not a side) facing to magnet?

Not likely. The sensor chip inside the hall only detects in one direction. Hall Sensor orientation.JPG If you place them like shown in your picture, There isn't much magnetic flux going in that direction. It might work but I'd think it would be real prone to timing errors at high load. It looks like...
by fechter
Dec 07, 2017 3:05 pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 575
Views: 18216

Re: la Nina rears her ugly head

Good time to make sure your fire insurance is up to date.
My daughter lives in Van Nuys, directly downwind of the Creek Fire. The smoke is choking.
by fechter
Dec 07, 2017 11:04 am
Forum: Motor Technology
Topic: BBSHD upgrade from 48V to 52V
Replies: 7
Views: 129

Re: BBSHD upgrade from 48V to 52V

Robleman wrote:
Dec 07, 2017 3:35 am
Thanks again!

I wonder what is the low voltage recommendation for a 18650 52v battery. It will have BMS but I want to be carefull to avoid damage.

Should it be 45-46V?
Yes, around there. The voltage will sag more when the motor is pulling hard. 46v resting is pretty much drained.
by fechter
Dec 07, 2017 12:12 am
Forum: E-Bike General Discussion
Topic: Electric handbike
Replies: 11
Views: 193

Re: Electric handbike

How would you operate a throttle?
by fechter
Dec 06, 2017 9:39 pm
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 130
Views: 8323

Re: How To, 50A BBSHD Controller Mod

Nice to see the insides. Thanks for posting the picture.

I can't make out the numbers on the chips very well.

What's this one?
BBSHD display board.jpg
BBSHD display board.jpg (148.17 KiB) Viewed 82 times
by fechter
Dec 06, 2017 3:25 pm
Forum: E-Bike General Discussion
Topic: How To, 50A BBSHD Controller Mod
Replies: 130
Views: 8323

Re: How To, 50A BBSHD Controller Mod

About the safety voltage drop, I was talking about the display, not the controller. I don't know if the display's caps and voltage controller can take damage, and that's what I was worried about :) That's a good question. Since the display unit I have is potted, it's not easy to open up and check. ...
by fechter
Dec 06, 2017 9:45 am
Forum: Battery Technology
Topic: Wire or Cable size? 100ahr 12.8V Lifepo4
Replies: 3
Views: 82

Re: Wire or Cable size? 100ahr 12.8V Lifepo4

How much current does the motor actually take?
by fechter
Dec 06, 2017 9:43 am
Forum: Battery Technology
Topic: So confused, please help (24s 99.6V battery charging/safety)
Replies: 20
Views: 260

Re: So confused, please help (24s 99.6V battery charging/safety)

As long as the voltage on the Meanwells is set right and the cells are balanced, nothing will get over charged. If a cell goes out of balance, that's where things could get dangerous. If you run a charge cycle then measure all the individual cell voltages, you can get a good idea for how close the b...
by fechter
Dec 06, 2017 9:30 am
Forum: Battery Technology
Topic: Using a MPPT solar charge controller as a bulk charger
Replies: 16
Views: 233

Re: Using a MPPT solar charge controller as a bulk charger

You might try removing the MPPT and hook the boost converter directly to the panels and compare. Most of the boost converters have adjustment for voltage and current. I think you could tweak the current to get the maximum power (manual MPPT). This would eliminate any losses in the MPPT unit.
by fechter
Dec 06, 2017 9:17 am
Forum: General Discussion
Topic: Retirement Time
Replies: 97
Views: 3853

Re: Retirement Time

I have a leaf vac, but it was a pain to use. OK for a small area. The bag doesn't hold much and it's such a pain to drag the power cord around. It had a tendency to suck up little rocks, sticks, etc. that damaged the impeller. What I do now is use it as a blower and blow all the leaves into a big pi...
by fechter
Dec 06, 2017 9:13 am
Forum: E-Bike Technical
Topic: 36 Volt 350 watt controller how to connect?
Replies: 15
Views: 230

Re: 36 Volt 350 watt controller how to connect?

It should be fine with the PAS connector disconnected. The 3 speed switch will default to speed 2 with no connection. One of the 3 wires will be ground. Grounding one remaining wire gives speed 1 and the other wire gives speed 3. Anyway, the motor should at least run in speed 2. Does it have a LED o...
by fechter
Dec 06, 2017 8:59 am
Forum: E-Bike Technical
Topic: 14s bms help
Replies: 11
Views: 199

Re: 14s bms help

cycborg wrote:
Dec 05, 2017 3:57 pm
If I understand the specs correctly, the trip current is 100 A, whereas 30 A is the continuous operation rating.
That should be good. I didn't read carefully enough.
by fechter
Dec 06, 2017 8:55 am
Forum: E-Bike Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1683
Views: 469434

Re: Your Creation's Before & After Pics

That's an impressively fat rear tire. It's begging for more horsepower.
by fechter
Dec 06, 2017 8:51 am
Forum: E-Bike General Discussion
Topic: Run motor with insufficient amp batteries damaging?
Replies: 12
Views: 237

Re: Run motor with insufficient amp batteries damaging?

If the BMS has issues with tripping, it might be possible to increase the tripping point or even disable the over current protection. Since the thing won't have to run very long, FET heating on the BMS shouldn't be an issue. Also keep in mind a typical lead-acid car battery has somewhere around 50Ah...
by fechter
Dec 05, 2017 3:33 pm
Forum: E-Bike General Discussion
Topic: Run motor with insufficient amp batteries damaging?
Replies: 12
Views: 237

Re: Run motor with insufficient amp batteries damaging?

With A123 cells, I wouldn't worry about it much as you won't be running the motor for long periods of time. If you draw too much current from any battery, it can overheat and possibly be damaged or catch fire.
by fechter
Dec 05, 2017 3:30 pm
Forum: E-Bike Technical
Topic: 14s bms help
Replies: 11
Views: 199

Re: 14s bms help

Either one of those look like they should work fine but personally, I'd go for the first one since it has a higher current rating. In theory, your controller won't draw more than 25A so a 30A rated BMS would be OK, but in the real world, the controller often has a little "overshoot" on the current l...
by fechter
Dec 05, 2017 3:16 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike from China
Replies: 160
Views: 9534

Re: Sur-Ron - New Mid drive Bike from China

Trail riding and single track would work great with this bike. I would watch it on the long steep climbs as it would overheat. It's happened to me twice where something cuts the power in half suddenly. It's either the battery, BMS or the controller. The motor is always barely warm when the power cu...
by fechter
Dec 05, 2017 3:10 pm
Forum: General Discussion
Topic: la Nina rears her ugly head
Replies: 575
Views: 18216

Re: la Nina rears her ugly head

Freeze warning for tonight here. I'd much rather have rain than freezing weather.
by fechter
Dec 05, 2017 3:06 pm
Forum: Motor Technology
Topic: BBSHD upgrade from 48V to 52V
Replies: 7
Views: 129

Re: BBSHD upgrade from 48V to 52V

That's what I do.
The voltage number can't read higher than about 56.3v, so it will stay there for a while until the pack gets a little drained. Once it gets below that level, it seems to be reasonably accurate.
by fechter
Dec 05, 2017 9:17 am
Forum: Motor Technology
Topic: BBSHD upgrade from 48V to 52V
Replies: 7
Views: 129

Re: BBSHD upgrade from 48V to 52V

You can just plug it in, but the battery meter will be off. I haven't found any way to reprogram the scale on the battery meter. But you have a voltage number on the display, so you need to know your voltage cutoff point. In practice, I've found that when the battery bar graph first comes off full, ...