Search found 1047 matches

by docw009
Aug 15 2019 9:37pm
Forum: E-Bike Technical
Topic: 17a or 20a controller?
Replies: 13
Views: 228

Re: 17a or 20a controller?

Matador is probably right. PSWpower is selling the max current rating. Here's the inside of my 20A sinewave model. and there's only 6 MOSFET's. I've got the S12S, rated at continuous 25A, and I believe there are 12 MOSFET's in it. P1070640.jpg In any case. I've also been running the very mild manner...
by docw009
Aug 15 2019 6:38pm
Forum: E-Bike General Discussion
Topic: Hub motor not centered
Replies: 12
Views: 202

Re: Hub motor not centered

Is this a motor intended to work with a cassette or freewheel (in which case it will be offset by whatever is needed to attach the gearset)? Or is it a true front wheel motor, which is symmetrical? Either way, the spokes can be made longer on one side and shorter on the other (by adjusting the nippl...
by docw009
Aug 11 2019 12:14am
Forum: Battery Technology
Topic: Charging a 11S (46.2v.) battery with a 10S (42v.) charger.
Replies: 5
Views: 139

Re: Charging a 11S (46.2v.) battery with a 10S (42v.) charger.

You're charging to 3.8V/cell The pack will eventually get unbalanced and you have to charge to 100% to get a balamnce BMS to balance. I also think you give up a lot of capacity at 3.8V/cell. People say you only lose 10%, but that's at low current. If you start pulling 1C or 2C, it seems to me the lo...
by docw009
Aug 10 2019 11:55pm
Forum: Battery Technology
Topic: Questions about importing from China to US
Replies: 13
Views: 307

Re: Questions about importing from China to US

I just got a completed$300 battery from UnitPackPower (UPP) from CHina to Illinois. In spite of what I hear about tariffs, there were no extra customs fees assessed. Maybe doesn't apply for something small? It was properly labelled as a lithium battery.
by docw009
Aug 10 2019 11:50pm
Forum: E-Bike Technical
Topic: Upgrading Prebuilt ebike to 48v or 52v?
Replies: 7
Views: 252

Re: Upgrading Prebuilt ebike to 48v or 52v?

If you look inside your controller at the caps and if they are 45v or 63v. The later can handle 52v. Maybe not your display thou. I think he will be OK with the display. The 810LED displays come in 24V, 36V, and 48V versions, and they will have a sticker to denote the voltage. I have both the 36V a...
by docw009
Aug 09 2019 10:34pm
Forum: E-Bike General Discussion
Topic: Broken ebike..how to fix?
Replies: 43
Views: 1088

Re: Broken ebike..how to fix?

On many ebikes, the throttle only works after you have selected one of the available PAS levels. If your ebike powers up in PAS 1, then ignore this statement. So now you put your meter on the throttle output wire and see if it starts at 1.0 V and goes up to around 4 or 5 volts when you turn the thro...
by docw009
Aug 07 2019 4:36pm
Forum: E-Bike General Discussion
Topic: c- p- b- bms
Replies: 9
Views: 185

Re: c- p- b- bms

High current, high voltage power devices do cost money. On the other hand, controllers and comparator IC's are so cheap. I understand your concern that the low cost of a BMS could extend to the components and quality of design.
by docw009
Aug 07 2019 11:25am
Forum: E-Bike General Discussion
Topic: c- p- b- bms
Replies: 9
Views: 185

Re: c- p- b- bms

Aha thanks. Is there a diagram for just using the BMS for voltage monitoring, to open/close contactors rather than routing all current through the BMS? Would use separate protection, e.g. fuses for overcurrent and short circuit protection. If you paid someone enough money, he/she would tap off the ...
by docw009
Aug 06 2019 8:11am
Forum: E-Bike Technical
Topic: Upgrading Prebuilt ebike to 48v or 52v?
Replies: 7
Views: 252

Re: Upgrading Prebuilt ebike to 48v or 52v?

By the way, E=HP, I hadn't noticed your build report before.Nice job on that bike.
by docw009
Aug 06 2019 8:06am
Forum: E-Bike Technical
Topic: Upgrading Prebuilt ebike to 48v or 52v?
Replies: 7
Views: 252

Re: Upgrading Prebuilt ebike to 48v or 52v?

I agree that you can probably find a 48V silverfish battery. but 52V may not be available. Some 36V controllers will run on 48V, but the problem is that their low voltage cutoff (LVC) is still locked in for a 36V pack. In fact, my first DIY ebike with a 36V controller will run all day at 52V, but it...
by docw009
Aug 05 2019 12:46am
Forum: E-Bike Technical
Topic: Changing 48V to 36V
Replies: 4
Views: 150

Re: Changing 48V to 36V

There is a long long thread about the TSDZ2 here.
viewtopic.php?f=28&t=79788

In it, they talk about reflashing the motor firmware so it will run on 36V. You have to buy a couple of little electronic clip-ons, I was going to do that, but I never did.
by docw009
Aug 04 2019 11:04am
Forum: E-Bike Technical
Topic: Suzhou KT-LCD1 Cruise Control.
Replies: 4
Views: 94

Re: Suzhou KT-LCD1 Cruise Control.

Many KT controllers have a connectors that can be jumpered to enable cruise control.
cruise.jpg
cruise.jpg (36.38 KiB) Viewed 42 times
by docw009
Aug 04 2019 2:09am
Forum: E-Bike Technical
Topic: Suzhou KT-LCD1 Cruise Control.
Replies: 4
Views: 94

Re: Suzhou KT-LCD1 Cruise Control.

Are you sure you meant LCD1? My LCD1 controller only has P1-P5. You can buy a LCD3 or a higher lever controller that has the additional C parameters.

LCD1 has the buttons in the same case.
P1150355.jpg
P1150355.jpg (80.76 KiB) Viewed 58 times
LCD3 has the buttons in a separate unit.
P1650331.jpg
P1650331.jpg (160.09 KiB) Viewed 58 times
by docw009
Aug 03 2019 6:59pm
Forum: E-Bike General Discussion
Topic: HELP KT LCD3 error code 3
Replies: 45
Views: 1441

Re: HELP KT LCD3 error code 3

I'd agree with that. Sensor problem, either continuity or the component is bad. I don't know of any multimeter tests to help here.

Is it a US seller?
by docw009
Aug 03 2019 1:19pm
Forum: E-Bike General Discussion
Topic: HELP KT LCD3 error code 3
Replies: 45
Views: 1441

Re: HELP KT LCD3 error code 3

I just took delivery on a brand new ebike I purchased on ebay. It came with a hub motor and the KT LCD3 display. The very first time I tried to ride it, the error code 3 came in. I checked all the wires and connectors. They all look good. I then used my voltmeter to verify 5v going to the motor hal...
by docw009
Aug 03 2019 12:19am
Forum: E-Bike General Discussion
Topic: HELP KT LCD3 error code 3
Replies: 45
Views: 1441

Re: HELP KT LCD3 error code 3

Hey, Back with an update. So yeah most of you were right apparently the cable was broken.. I'm not sure how that happened but at least its fixed now. The motor cables seem to be pretty fragile Great. I didn't see your update when you posted originally, but glad to hear you figured it out! Me, I've ...
by docw009
Aug 02 2019 9:31pm
Forum: E-Bike General Discussion
Topic: dual mode/Universal Voltage controllers worth?
Replies: 3
Views: 115

Re: dual mode/Universal Voltage controllers worth?

Yes, I have used these PSWpower 36/48V 20A sinewave controlers. When a battery is attached, the controller looks at the initial voltage and will select either 36V or 48V. Normal range of a 48V pack is 42-54V. Normal range of a 36V pack is 30-42V. If You attach a discharged 48V pack that is at 44 V, ...
by docw009
Aug 02 2019 5:01pm
Forum: E-Bike Technical
Topic: upgrading my controller
Replies: 9
Views: 330

Re: upgrading my controller

I would do Blue and Yellow to 1 and 2.
by docw009
Aug 01 2019 11:33pm
Forum: E-Bike General Discussion
Topic: Troubleshooting shorted throttle controller
Replies: 11
Views: 200

Re: Troubleshooting shorted throttle controller

When repairing the cable, you obviously matched the wire colors. SInce you supplied the PDF, this is the likely definitions, Red VB: battery voltage, Has to be battery voltage if display can show battery status. Blue Control: The 880 probably connects blue to red to start controller. GND Black: batt...
by docw009
Jul 28 2019 10:13pm
Forum: E-Bike Technical
Topic: upgrading my controller
Replies: 9
Views: 330

Re: upgrading my controller

If you already have the display, then you have to know what controllers work with it. In general, compatible controllers and displays are made by the same company, or they sold by the same seller who knows that the pair work together.
by docw009
Jul 25 2019 8:56pm
Forum: E-Bike General Discussion
Topic: Do you prefer freewheel or cassettte for your hub motor?
Replies: 19
Views: 816

Re: Do you prefer freewheel or cassettte for your hub motor?

Only one time did I have a opportunity to choose a cassette, and that was the Q100C vs the Q100H. Since the Q100's are dinky motors, I chose the freewheel version because it's a little wider and BMSBattery said it had more torque. And because I put them in 20" wheels, I had to go with the DNP 11T-34T.
by docw009
Jul 25 2019 8:47pm
Forum: E-Bike General Discussion
Topic: How many throttles have you damaged?
Replies: 6
Views: 274

Re: How many throttles have you damaged?

Have not damaged any from electrical mishaps, but all were standard 3 wire units. If playing around with a model that brings in battery power to a start button, yes, you would probably smoke it if you miswired any of the low voltage throttle circuits to the battery,
by docw009
Jul 22 2019 10:37am
Forum: E-Bike General Discussion
Topic: Stupid. Stupid. Killed a battery but no fire.
Replies: 10
Views: 509

Stupid. Stupid. Killed a battery but no fire.

Last night I put a 48V charger by mistake on my 36V 10S-3P shrink wrapped pack. Worse, I had an XT60 adapter plugged into the XT90 discharge port, and thought it was the XT60 charge port. So no BMS protection. I discovered my error a few hours later when I unplugged the pack, saw it was too warm and...
by docw009
Jul 21 2019 9:50am
Forum: E-Bike General Discussion
Topic: Broken ebike..how to fix?
Replies: 43
Views: 1088

Re: Broken ebike..how to fix?

Well, if you can see the 7805, why not check the output. Left side is Vin. Ctr is Gnd. Right side is %V. How do I go about this? Simply connect the multimeter set at 20V DC to the two sides? I figured that if you knew what a 7806 was, then you knew how to use a voltmeter. Black pin on ground. Motor...
by docw009
Jul 20 2019 3:34pm
Forum: E-Bike Technical
Topic: Adding Pedal Assist option to motor controller..
Replies: 2
Views: 184

Re: Adding Pedal Assist option to motor controller..

Most ebike controllers use the voltage level on the throttle input to control motor speed. WHen they have PAS inputs, they count the pulses produced by the PAS sensor.

That means, No, you cannot connect a PAS sensor to a throttle input.