Search found 2148 matches

by Voltron
Nov 30 2020 3:56pm
Forum: E-Bike Technical
Topic: Stromer moter will do walk assist only
Replies: 6
Views: 214

Re: Stromer moter will do walk assist only

Hard to open... You have to undo all the spokes and pull the two halves apart... Not like regular ones where the sides come off
by Voltron
Nov 29 2020 12:13pm
Forum: E-Bike General Discussion
Topic: New build : Mid-tail ebike with hub motor
Replies: 4
Views: 232

Re: New build : Mid-tail ebike with hub motor

I lucked into this 1st gen Yuba Mundo frame that became my utility monster as I went further and further down the small diameter wheel rabbit hole... I also have a seat from a big scooter that clamps onto the rack for passengers. My kids were older, so less worry, but really really think about ways ...
by Voltron
Nov 29 2020 11:50am
Forum: E-Bike General Discussion
Topic: New build : Mid-tail ebike with hub motor
Replies: 4
Views: 232

Re: New build : Mid-tail ebike with hub motor

You're going to love it either way 👍 Mid cargo with powerful motor is just about the perfect car substitute. From my experience, I would pick direct drive. I really value reliability for this kind of utility bike, so direct drive is nearly indestructible, as long as you don't grind it uphill at low ...
by Voltron
Nov 24 2020 1:54pm
Forum: Battery Technology
Topic: Best way to do this?
Replies: 15
Views: 473

Re: Best way to do this?

Lots of premade ones out there too, to either buy or copy.
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by Voltron
Nov 23 2020 1:20pm
Forum: Battery Technology
Topic: Best way to do this?
Replies: 15
Views: 473

Re: Best way to do this?

From my 72v paralleling experience, a small mismatch in lengths and uneven wearing never turned out to be issues, esp if not used at crazy amp levels and super deep discharges. One thing to consider if using XT90 type is if you make it to where the system can run with one battery unplugged, the meta...
by Voltron
Nov 11 2020 4:30pm
Forum: Battery Technology
Topic: Internal Battery Balance BMS Board?
Replies: 14
Views: 416

Re: Internal Battery Balance BMS Board?

Ideally you should have a BMS hooked up all the time, that monitors each group during use, to prevent one from sagging too low before the overall battery low voltage cutoff happens, and they usually have amp limits to keep hooking it to a controller that draws too much current from damaging the enti...
by Voltron
Nov 11 2020 11:20am
Forum: Battery Technology
Topic: Internal Battery Balance BMS Board?
Replies: 14
Views: 416

Re: Internal Battery Balance BMS Board?

Another p.s.... it's not as safe, but you can run the battery without a BMS, and manually check it for balance periodically. The biggest thing is making sure the low voltage cutoff in the controller is high enough to not take the battery voltage too low during running. I get lots of batteries that h...
by Voltron
Nov 11 2020 11:14am
Forum: Battery Technology
Topic: Internal Battery Balance BMS Board?
Replies: 14
Views: 416

Re: Internal Battery Balance BMS Board?

I've got some leftover BMS boards from Solo wheels that were for split 14s packs. I'll send you one for experimenting if you want.

P.s. none of the stuff for balancing and temp monitoring is in a charger usually.
by Voltron
Nov 11 2020 11:07am
Forum: E-Bike Technical
Topic: Help with unknown ebike controler repair
Replies: 9
Views: 427

Re: Help with unknown ebike controler repair

I've got a giant bin of 36v controllers and throttles from dead bikes... I'll send you one if you pay postage. Feel free to pm me about it
by Voltron
Oct 24 2020 9:55am
Forum: E-Bike General Discussion
Topic: Hunting mid-drive build - frame choices
Replies: 18
Views: 767

Re: Hunting mid-drive build - frame choices

I would go fat tire if you have the chance vs 27.5, but there's been a few fat tire frames I set customers up with where the chainrings got too close to the seat stay, and we had to switch to a different frame. Just an fyi, on one customers aluminum fat bike frame, the pull on the chain from the mot...
by Voltron
Oct 24 2020 9:39am
Forum: E-Bike Technical
Topic: repair bike battery
Replies: 15
Views: 521

Re: repair bike battery

Not just basement generic batteries either.. it was like that in some Bosch packs I opened also.
by Voltron
Oct 23 2020 11:07pm
Forum: E-Bike Technical
Topic: repair bike battery
Replies: 15
Views: 521

Re: repair bike battery

All the ones I've seen have the power and charger wires soldered on, so you're at least looking at doing that, or finding one with short wires already attached, and splice to your existing wires. Making sure the balance wire plug matches is good... It sucks to have to splice all of those too, but th...
by Voltron
Oct 22 2020 9:44am
Forum: E-Bike Build Threads / Photos & Video
Topic: 24v EV Global E-Bike
Replies: 19
Views: 3540

Re: 24v EV Global E-Bike

You can't with the stock system. Some of the later model ones were 36v, so maybe that is why this one is slower.

Edit- could the other faster one you rode maybe have had aftermarket controller etc under the plastics?
by Voltron
Oct 21 2020 11:32am
Forum: E-Bike Technical
Topic: repair bike battery
Replies: 15
Views: 521

Re: repair bike battery

And you prob won't be able to find that exact BMS, they're pretty random. I've opened up outwardly identical packs from the same brand ebike, with totally different BMSs inside
by Voltron
Oct 21 2020 11:26am
Forum: E-Bike Technical
Topic: repair bike battery
Replies: 15
Views: 521

Re: repair bike battery

Can you get to the actual positive and negative of the battery, before the BMS? If you have normal voltage there, but none at the BMS, that usually means new BMS, unless you can find a broken wire or something... Usually no fuses between it and the battery, usually fuses are just on the charger inpu...
by Voltron
Oct 20 2020 6:08am
Forum: E-Bike Technical
Topic: repair bike battery
Replies: 15
Views: 521

Re: repair bike battery

Do you have a voltmeter?
by Voltron
Oct 18 2020 2:00pm
Forum: E-Bike Technical
Topic: Geared hub motor won't work, hard to roll backwards
Replies: 8
Views: 412

Re: Geared hub motor won't work, hard to roll backwards

The tester link didn't show up...
by Voltron
Oct 17 2020 10:53pm
Forum: E-Bike Technical
Topic: Geared hub motor won't work, hard to roll backwards
Replies: 8
Views: 412

Re: Geared hub motor won't work, hard to roll backwards

Being extra hard to turn is sometimes a sign of the phase wires being shorted together...

Cogging is what is usually called... Normal backwards spin on a gear motor should be harder than forwards, but like a gentle whirring, not super notchy.
by Voltron
Oct 17 2020 10:29pm
Forum: E-Bike Technical
Topic: Geared hub motor won't work, hard to roll backwards
Replies: 8
Views: 412

Re: Geared hub motor won't work, hard to roll backwards

Geared motors are supposed to be hard to turn backwards... That's when you're actually making to motor turn inside the outer shell... When you spin it forward the clutch releases and just the outer shell turns, unlike a direct drive where it feels the same both directions. As to why it's not running...
by Voltron
Oct 13 2020 12:54pm
Forum: Battery Technology
Topic: Split ebike battery
Replies: 67
Views: 1969

Re: Split ebike battery

Re. using thicker balance wires, thin ones are somewhat self fusing, and will melt if shorted...usually anyway. When you go bigger, then you also have to start thinking about individually fusing each one, in case the harness shorts in a crash, for example...
by Voltron
Oct 13 2020 12:40pm
Forum: E-Bike General Discussion
Topic: A Second Battery - Connecting permanently
Replies: 8
Views: 311

Re: A Second Battery - Connecting permanently

One plus of at least having plugs for the parallel-ing is you can separate the packs, and have two chargers, one per pack, and halve your charge time.... Here's one of my typical heap-o-recycled batteries setups.. 4 recalled Pedego packs, and 2 thrown away $900 Bosch packs that both got a drop of wa...
by Voltron
Oct 13 2020 12:25pm
Forum: E-Bike General Discussion
Topic: A Second Battery - Connecting permanently
Replies: 8
Views: 311

Re: A Second Battery - Connecting permanently

I don't have much personal experience with it, but have read certain BMSs don't like being in parallel. Assuming that's not a problem, then diode free is better, otherwise the packs won't try to equalize voltage with each other. If they aren't perfectly matched units, one will have slightly less cap...
by Voltron
Oct 12 2020 1:12pm
Forum: Battery Technology
Topic: Split ebike battery
Replies: 67
Views: 1969

Re: Split ebike battery

I just run a backpack battery on my full suspension builds, esp during the early days of a build when you're not even sure if you'll love the ride. It's the hardest part of the setup to get right, and I've had several times I was excited about a particular bike, and all the getting the battery turne...
by Voltron
Oct 02 2020 12:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: My Bafang Ultra G510 Motor Is Burned Up (Fried)
Replies: 6
Views: 372

Re: My Bafang Ultra G510 Motor Is Burned Up (Fried)

Re the overheating, the voltage won't make the motor overheat, it's the total power i.e. high amps at that voltage. Have you been changing gears so the motor isn't subtly bogging down on hills and slowly cooking? I ask as it's a powerful motor, and can keep grinding even though it would be happier a...
by Voltron
Oct 02 2020 12:14pm
Forum: E-Bike Non-hub Motor Drives
Topic: My Bafang Ultra G510 Motor Is Burned Up (Fried)
Replies: 6
Views: 372

Re: My Bafang Ultra G510 Motor Is Burned Up (Fried)

This is just guessing, don't know that exact motor, but that sure looks like a Hall wires connector, with the white wire probably being speed signal. I'm not sure the motor would even run without Halls working, does it fit any plugs on the controller, even though the board side might be white, and m...