Search found 1287 matches

by docw009
Jul 08 2020 4:21pm
Forum: E-Bike General Discussion
Topic: Is this a lie?! False Avertising
Replies: 7
Views: 214

Re: Is this a lie?! False Avertising

Your first seller could be called confused, if we were charitable, but I think he's a liar/scammer, Just avoid these bums. I've purchased a few batteries on ebay from Unit Pack Power, stating in 2015 when they were called elifebike. That first pack still works. Last one I bought was in late 2019, a ...
by docw009
Jul 07 2020 10:30pm
Forum: E-Bike General Discussion
Topic: BBSHD Future proof/worth it 2020?
Replies: 14
Views: 281

Re: BBSHD Future proof/worth it 2020?

It's just me, but I wouldn't use the Vruzend kit either unless it was for a little battery. I never owned one, but have seen a few people struggling with them on these forums, mostly not being able to maintain contact on big batteries.
by docw009
Jul 04 2020 9:34pm
Forum: E-Bike General Discussion
Topic: I need some help Wiring up my new controller to my new throttle.(images)
Replies: 8
Views: 130

Re: I need some help Wiring up my new controller to my new throttle.(images)

Easy enough to test. Hook the battery and throttle up. Leave the lock line (blue wire) free. Hit the power on the throttle and see if the lock line goes to battery voltage. I bet it does.
by docw009
Jul 03 2020 12:16am
Forum: E-Bike Technical
Topic: Hub Motor Upgrade 500W to 750W
Replies: 71
Views: 641

Re: Hub Motor Upgrade 500W to 750W

Even if they told you, you better measure the dropout yourself. It's not that hard to remove the hub motor.
by docw009
Jul 02 2020 8:05am
Forum: E-Bike Technical
Topic: Hub Motor Upgrade 500W to 750W
Replies: 71
Views: 641

Re: Hub Motor Upgrade 500W to 750W

Take off your existing motor and check the dropout distance first. I have an Ecotric 20" fat tire folding bike. I figured it was your typical 175mm dropout and bought a bigger motor.

After I spoked it up and tried to fit it in, I found my Ecotric model had 165mm dropouts, I couldn't use the wheel,
by docw009
Jul 01 2020 6:13pm
Forum: E-Bike General Discussion
Topic: 48 v controller on a 36 V TSDZ2 motor?
Replies: 6
Views: 121

Re: 48 v controller on a 36 V TSDZ2 motor?

Are we talking Tomg SHeng controllers, not an external model running the motor directly? I thought the main difference was how some firmware registers was populated, i.e., it's the same controller. I dunno. The huge thread on the TSDZ2 lost me.
by docw009
Jun 27 2020 12:56pm
Forum: E-Bike Technical
Topic: Chinese 3kW KIT PAS Problem
Replies: 5
Views: 153

Re: Chinese 3kW KIT PAS Problem

I had another kit (ebikeling) that used the SW900 display and had the same probkem. All PAS levels; seemed to do only one thing, They would race the bike up to max speed whenever the pedals turned. There were some parameter settings to modify this in the SW900 settings but they had little effect. I ...
by docw009
Jun 27 2020 12:42pm
Forum: E-Bike Technical
Topic: Increasing top speed by overvolting?
Replies: 10
Views: 334

Re: Increasing top speed by overvolting?

I'm pretty sure the Kt displays contain an onboard voltage converter to power the LCD circuits and the onboard uart for serial data. If you drop the voltage to the display, the unit will return that voltage to the controller. where it's used tp power all the lower voltage circuits in the controller....
by docw009
Jun 20 2020 12:28pm
Forum: E-Bike General Discussion
Topic: fixing flats..which brand?
Replies: 18
Views: 328

Re: fixing flats..which brand?

I use the normal adhesive rubber patch with a tube of rubber cement. Make sure the cement dries a little tacky and it held tight. No, the peel off and stick are useless w/o rubber cement.
by docw009
Jun 20 2020 11:23am
Forum: E-Bike Technical
Topic: Controller replacement question
Replies: 17
Views: 306

Re: Controller replacement question

You've done the first step by dIsconnecting the learning wires. Check the walk mode. Having PAS work could mean you've sorted that out, Does it run only with the crank turning? If it's always running, you may have the PAS connected to the throttle. On my Brainpower controller, which I bought in 2017...
by docw009
Jun 19 2020 7:28am
Forum: E-Bike Technical
Topic: XLD Brainpower motor controller XunLiDa
Replies: 116
Views: 45518

Re: XLD Brainpower motor controller XunLiDa

hola a todos, perdonar por meterme de por medio, tengo un problema.......como muchos de los aqui presentes jejejejejejej, tengo una controladora que pone asi; XLD BRAINPOWER ETC. 48V 1000W 38A BRAKE LOW, ITEM no. DG61. XuLiDa. En la salida pude encontrar dos cables para hacer girar el motor el acce...
by docw009
Jun 19 2020 7:17am
Forum: E-Bike Technical
Topic: Controller replacement question
Replies: 17
Views: 306

Re: Controller replacement question

Interesting, thank you. Could you tell me what type of speed sensor works with the Brainpower controller? Stefan First, tell us if your original KT controller used an LCD that displays speed. If it does, then locate the external speed sensor that must be on the front wheel. We're giving this sensor...
by docw009
Jun 18 2020 11:05pm
Forum: E-Bike Technical
Topic: Controller replacement question
Replies: 17
Views: 306

Re: Controller replacement question

The white on the 6 pin Hall connector is to support an internal speed senor from the motor. Your motor doesn't have an internal sensor if it only had 5 wires. Thats OK. If your original controller and LCD showed the speed, then there must be a external sensor on the front wheel. When you hook up the...
by docw009
Jun 18 2020 10:38pm
Forum: E-Bike Technical
Topic: Ebikeling 1200W Controller starts then dies
Replies: 7
Views: 402

Re: Ebikeling 1200W Controller starts then dies

What's the specs on your battery, jsr11?

This type of behavior where motor runs with load but causes a battery reset when the wheel is on the ground could mean the battery can't supply the current used by a 1200 W controller without sagging under LVC..
by docw009
Jun 15 2020 10:12am
Forum: E-Bike General Discussion
Topic: Single wall rim question
Replies: 16
Views: 282

Re: Single wall rim question

While you can make it work, it's a small expense for peace of mind. I pay about 30 dollars for a Sun RIngle double wall 20" rim. A double wall is much more forgiving if you ordered spokes a few mm too long and need washers. After getting used to double walls, putting rim tape over an exposed nipple ...
by docw009
Jun 03 2020 11:52am
Forum: Battery Technology
Topic: Smaller packs or 1 large battery?
Replies: 12
Views: 270

Re: Smaller packs or 1 large battery?

In my case, I did it for packaging. I paralleled two small batteries because I could put them on either side of the rack on my wife's ebike. Two BMS of course. I went with a single port BMS design so I could leave them in parallel and charge in parallel. Used a PVC drain pipe as a battery holder. On...
by docw009
Jun 03 2020 11:42am
Forum: Battery Technology
Topic: DIY Li-ion battery: first connect cells in series, then in parallel
Replies: 22
Views: 561

Re: DIY Li-ion battery: first connect cells in series, then in parallel

I believe it's electrically safe to take six strings of 10S-1P and then make them into a 10S-6p, as long as all the cells have equal voltages. Probably want to start at the negative end and add the straps in sequence. I've put two 10S-2P strings in parallel like this to make a 10S-4P. Whether it's m...
by docw009
May 31 2020 10:52pm
Forum: E-Bike General Discussion
Topic: controller for running Q100H at 48 volts, and motor maintenance
Replies: 4
Views: 143

Re: controller for running Q100H at 48 volts, and motor maintenance

How do you twist off the cover? I believe BMSbattery sent someone a tool. It's long bar of steel that screws into three of the screw holes you were talking about.

I've got a Q128 with a fried speed sensor. I didn't even try to open it. I just put on an external sensor.
by docw009
May 31 2020 4:07pm
Forum: E-Bike General Discussion
Topic: CNEBIKE 48v 1000W conversion kit
Replies: 7
Views: 198

Re: CNEBIKE 48v 1000W conversion kit

Displays are designed to work with specific controllers. You will have to post the label on your display. If someone reading has the same model and has the display they can make a suggestion. CNEbikes is a big seller of ebike parts in China. I bought something from them on 2015. Good grief. they sho...
by docw009
May 31 2020 2:13am
Forum: E-Bike General Discussion
Topic: Folding bike DIY help
Replies: 6
Views: 131

Re: Folding bike DIY help

I've used Q100H from BMSbattery or a AK100 (similar or same) from topbikekit.com. These will take 500W out of a 20A sine wave controller on 36V. run up to about 18-20 mph, and your pedals can't keep up with a 20" bike at that speed anyway. You will want the higher rpm models (I think it was 260 rpm)...
by docw009
May 26 2020 9:44am
Forum: E-Bike General Discussion
Topic: Lightweight City Hub Conversion shopping list
Replies: 7
Views: 397

Re: Lightweight City Hub Conversion shopping list

About your battery choice. I own several of them. The weakness is the plastic bottle cage. It cannot support the weight of the battery and will break. I hammered out a metal U-cradle for the front on my bikes and velcro the pack both in the rear and the front.
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by docw009
May 22 2020 9:11am
Forum: Battery Technology
Topic: USA Stock of BMS's?
Replies: 13
Views: 579

Re: USA Stock of BMS's?

Jeez. I thought my $25 BMS was like Cadillac/Lexus quality. They put the $5 BMS in most of my batteries.
by docw009
May 22 2020 8:30am
Forum: E-Bike General Discussion
Topic: Ninebot battery for my Ebike?
Replies: 5
Views: 140

Re: Ninebot battery for my Ebike?

I'm not too familiar with the ninebot ES4 external battery, but I have played with a couple of ES2/ES4 internal batteries. I tried to run a 36v hub with a generic motor controller with one of the ES2 batteries, and the BMS would cut out on a any significant voltage drain. I think if the BMS doesn't...
by docw009
May 18 2020 11:14pm
Forum: E-Bike General Discussion
Topic: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER
Replies: 12
Views: 358

Re: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER

The speed increase was the same as when I would put a 48V pack in place of a 36V pack. On throttle only, max speeds on my geared motor went from about 20 mph to 24 mph on an actual 50V from the booster. I picked one bike, a 500W geared motor on a 20" fat tire wheel.That bike hit 24 mph on 50V, and i...
by docw009
May 17 2020 8:24pm
Forum: E-Bike General Discussion
Topic: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER
Replies: 12
Views: 358

Re: INCREASE EBIKE SPEED WITH DC BOOST CONVERTER

Well, getting back to boosting 36V to 52V, I get 65-70% efficiency. Bike burns 2.25 AH, battery supplies 3.3 AH.

My unit is a 1500W that maxes out at 20A output, but can take 30A from battery. Cost me less than 20 bucks, Bought it as a curiosity.