Search found 1194 matches

by docw009
Feb 21 2020 2:34pm
Forum: E-Bike General Discussion
Topic: Install hitch for bike trailer on 12 mm axle
Replies: 4
Views: 123

Re: Install hitch for bike trailer on 12 mm axle

The Q128 will have the power cable coming out of the axle on that side, and half of the metal is ground away, to let the wire exit, so there's not a lot of threaded metal rod on that side to hold additional nuts/plates. Even if the axle was long enough for extra nuts, I think mounting a plate that s...
by docw009
Feb 19 2020 9:30pm
Forum: E-Bike Technical
Topic: switching to a new 4 prong battery from 2 prong?
Replies: 15
Views: 503

Re: switching to a new 4 prong battery from 2 prong?

Maybe he flipped the second picture left-to-right. On my Silverfish pack, the terminals are like the top picture you showed with the "+ S -". In other words the positive terminal is nearest the drive chain.

I only have the one pack, but it only uses the two outer positions.
by docw009
Feb 14 2020 2:27pm
Forum: E-Bike General Discussion
Topic: 40v Ryobi e-Bike
Replies: 21
Views: 2610

Re: 40v Ryobi e-Bike

Can they be run in series? The risk with a series arrangement is you get the total pack voltage (84V) across one BMS if it happens to shut off, so its transistors need to be rated for that voltage. In this sketch, two batteries in series, with the BMS circuits represented by a switch. So I'm not goi...
by docw009
Feb 14 2020 1:53pm
Forum: Battery Technology
Topic: BMS not charging or discharging
Replies: 40
Views: 827

Re: BMS not charging or discharging

I don't see what you see, Molfped. I see the two red wires on the XT connectors changing to green and then connecting to the last terminal (B+ ?) but I could be seeing what I expected to see, and you probably have a better eye. By the way, is that an XT90 for discharge and an XT60 for charge? I kill...
by docw009
Feb 14 2020 1:10pm
Forum: E-Bike General Discussion
Topic: Newb...What do you recommend?
Replies: 32
Views: 936

Re: Newb...What do you recommend?

If the battery doesn't reset when you give it full throttle, it should be OK. Even if it does, you would pay more than $500 just for a new bike and motor. The big risk on these things is if it's stolen or if the battery wants to explode.
by docw009
Feb 14 2020 1:01pm
Forum: Battery Technology
Topic: BMS not charging or discharging
Replies: 40
Views: 827

Re: BMS not charging or discharging

The connectivity shown in KevMCA's pictures make sense to me. Might be a problem with the copper strips screwed down to solder pads passing current. Could be oxidation on both surfaces. Did he pull the balance connector and measure the balance voltages at the connector, using pins? What happens if h...
by docw009
Feb 13 2020 5:24pm
Forum: E-Bike General Discussion
Topic: 48V500W Rear Driving BikeConversion Kit
Replies: 28
Views: 942

Re: 48V500W Rear Driving BikeConversion Kit

A closer look and now it looks like a MOSFET overheated. Maybe there was a short circuit that you didn't notice.
by docw009
Feb 13 2020 1:45am
Forum: E-Bike Technical
Topic: Questions about KT controller and Q100 hub motors
Replies: 9
Views: 338

Re: Questions about KT controller and Q100 hub motors

One thing that seems different with my AKM motor. I measured the O.L.D. at 137 mm. I never had a fit problem with the BMSBattery motors fitting into a frame, but I've got an alloy one that is exactly 135 mm, and that won't go. I got it down to 135mm by taking 2mm off the spacer that sits inside the ...
by docw009
Feb 11 2020 9:50pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1676
Views: 482161

Re: Homemade Battery Packs

Glad to hear you're getting life back together, DrkAngel.

By the way, I ran my 10S-4P EVE 10AH combo down to 34 volts. Recharged it and it took 9.4AH, so it will be a serviceable pack for my ebiking.
by docw009
Feb 11 2020 9:42pm
Forum: Battery Technology
Topic: BMS not charging or discharging
Replies: 40
Views: 827

Re: BMS not charging or discharging

If the BMS turns the discharge mosfets off due to LVC, it should still leave the charge mosfets on to allow charging. The body diodes in the discharge mosfets still allow reverse current to flow through them back into the cells, even when they are off. So I don't know what your point is. If the BMS...
by docw009
Feb 11 2020 11:34am
Forum: E-Bike General Discussion
Topic: 48V500W Rear Driving BikeConversion Kit
Replies: 28
Views: 942

Re: 48V500W Rear Driving BikeConversion Kit

Looks like water got in there. You will need a 13S BMS with an on/off switch, with the same current rating as your battery. Probably 25A? And it needs to fit inside the case. Also, a balance BMS is better in my opinion, This might fit, but it's not a balance BMS and it's only 15A. https://www.aliexp...
by docw009
Feb 10 2020 8:59am
Forum: E-Bike Technical
Topic: HELP!! Changeover controller not working with KTLCD8
Replies: 5
Views: 158

Re: HELP!! Changeover controller not working with KTLCD8

The good thing about the various displays is that they use the same plug wiring,, at least for the battery/ground connections. Any display will power up with only battery and ground, if they are in the right pins. If they were not the right pins, 48V or 36V applied to the wrong would be popping the ...
by docw009
Feb 08 2020 6:56pm
Forum: E-Bike Technical
Topic: Brainpower Motor Controller - Throttle power issue
Replies: 5
Views: 137

Re: Brainpower Motor Controller - Throttle power issue

A well known fault on these Hall effect throttles occurs when the ground lead breaks and you get full throttle. This can be replicated by putting a diode between the Power and signal lead. Sometimes I pick up a controller and don't know which of the three pin plugs is for PAS or throttle (or speed s...
by docw009
Feb 07 2020 11:22pm
Forum: E-Bike General Discussion
Topic: Rad battery on kit build
Replies: 6
Views: 411

Re: Rad battery on kit build

A few systems, like BionX (bankrupt) will configure the battery with extra data wires whose main purpose is to tell the controller it''s a genuine Bionx battery. Sure, they can be useful for diagnostics too, but the main reason is to force the user to use the same brand of battery. Called proprietar...
by docw009
Feb 05 2020 10:39pm
Forum: E-Bike General Discussion
Topic: 48V500W Rear Driving BikeConversion Kit
Replies: 28
Views: 942

Re: 48V500W Rear Driving BikeConversion Kit

Charger shines with a green light , so seems to have stopped charging , after anothe 2 hours of charging , power of switch voltage is 45 volt , power switch on on is 54.6 V :roll: Step back. Is this still true? Your power switch sounds like it's working. While this is OK, if the 45 volts is just re...
by docw009
Feb 05 2020 10:16pm
Forum: E-Bike Technical
Topic: Questions about KT controller and Q100 hub motors
Replies: 9
Views: 338

Re: Questions about KT controller and Q100 hub motors

Clarpark, I take it back. Thinking about my MXUS motor, where I spent an hour trying to figure the gearing/magnet count from watching a hall sensor flash. The AKM's are 12.6:1 reduction ratio and you can get 201, 260 and 328 rpm. Amberwolf - that's a nice trick to run two controllers off one display..
by docw009
Feb 05 2020 7:09pm
Forum: E-Bike Technical
Topic: Questions about KT controller and Q100 hub motors
Replies: 9
Views: 338

Re: Questions about KT controller and Q100 hub motors

With a dual controller, I believe the major advantage is no second display to clutter up the cockpit. Having one display to set a common PAS level on both motors seems a plus. Having a built-in shared throttle is also nice. Separate controllers means two displays and more wiring. While you can jumpe...
by docw009
Feb 05 2020 2:38pm
Forum: E-Bike General Discussion
Topic: Newb...What do you recommend?
Replies: 32
Views: 936

Re: Newb...What do you recommend?

Ebikes not allowed on sidewalks in Illinois, but like others have noted, given a choice of riding on a four lane road where the speed limit is 45 mph or the sidewalk, , I'll take my chances on a ticket riding on the adjacent sidewalk. When we were down in Florida riding some of the inter-city bike p...
by docw009
Feb 05 2020 2:24am
Forum: E-Bike General Discussion
Topic: Troubleshooting
Replies: 15
Views: 800

Re: Troubleshooting

Karl Gesslein says "There are 2 kinds of BMS, ‘balancing’ (smart) BMS and ‘monitoring’ (stupid) BMS. " https://electricbike-blog.com/2015/02/15/nursing-an-out-of-balance-lithium-cell-back-to-health-without-dying-in-the-process/ Tom Jazewksi (he posts here sometimes) used to do some customer support ...
by docw009
Feb 03 2020 10:38pm
Forum: E-Bike General Discussion
Topic: Troubleshooting
Replies: 15
Views: 800

Re: Troubleshooting

I think your battery must be badly unbalanced. You have a few cells just barely above the minimum voltage, and the rest are almost at full voltage. When you try to charge it, the charger stops as soon as the high cells reach full voltage and the low cells can't get recharged. When you run the bike, ...
by docw009
Feb 02 2020 7:21pm
Forum: E-Bike General Discussion
Topic: 48V500W Rear Driving BikeConversion Kit
Replies: 28
Views: 942

Re: 48V500W Rear Driving BikeConversion Kit

The action of the LCD3 and confirmation from your voltmeter says the battery is not turning on. Your description suggests it charges the controller capacitors briefly, and when you turn on the controller. they discharge. I think you need to figure out why the battery isn't working. It's got a red on...
by docw009
Jan 30 2020 1:40am
Forum: E-Bike General Discussion
Topic: XLD 36v Controller
Replies: 7
Views: 803

Re: XLD 36v Controller

I find the the generic PAS orange sensors work fine with that controller. My only problem with it was that it's not very powerful at 13A. So I don't use it except as a motor tester.
by docw009
Jan 29 2020 10:08pm
Forum: Battery Technology
Topic: Help pls - New battery Unbalanced after 3 cycles
Replies: 7
Views: 580

Re: Help pls - New battery Unbalanced after 3 cycles

Was this pressure contact battery (Vruzend) or spot welded?
by docw009
Jan 28 2020 9:45pm
Forum: E-Bike General Discussion
Topic: can't turn on bike
Replies: 18
Views: 587

Re: can't turn on bike

Many displays will turn on if you just connect power/ground and press the start button. No controller needed.
by docw009
Jan 28 2020 9:22pm
Forum: E-Bike General Discussion
Topic: Troubleshooting
Replies: 15
Views: 800

Re: Troubleshooting

How old is the battery? Is it a brand name ebike? How far did you ride on a full charge when it was new? How far do you go now?