Search found 30 matches

by cg_ebiker
Jan 04 2021 10:12am
Forum: EBike Technical
Topic: Lacing front mtb hub to 18" rim?
Replies: 7
Views: 212

Re: Lacing front mtb hub to 18" rim?

Also wondering what size tyre to get. The seller lists it as 85mm across but as you can see it isn't actually. I have up to 4" clearance in the dropouts so was thinking of some 90/90 tyres like these https://www.tyretectrading.co.uk/cst-c6 ... front.html ?
by cg_ebiker
Jan 04 2021 7:34am
Forum: EBike Technical
Topic: Lacing front mtb hub to 18" rim?
Replies: 7
Views: 212

Re: Lacing front mtb hub to 18" rim?

Oh well, I've bought the spokes now but I'll remember that for the future. There's loads of clearance between the spokes and the spoke holes so that isn't an issue, I just need to redo it so that the angle of the spokes matches the angle of the rim hole. As I've started tensioning the spokes, the've...
by cg_ebiker
Jan 04 2021 5:54am
Forum: EBike Technical
Topic: Lacing front mtb hub to 18" rim?
Replies: 7
Views: 212

Re: Lacing front mtb hub to 18" rim?

What spoke gauge are you using? 12 gauge I think I'm getting somewhere and realised I wasn't threading the spoke under another spoke on the 'loose' side. I still don't think I'm doing it right as there is a lot of tension and the spokes still look bent. Hopefully the photos show the right angles bu...
by cg_ebiker
Jan 03 2021 12:10pm
Forum: EBike Technical
Topic: Lacing front mtb hub to 18" rim?
Replies: 7
Views: 212

Lacing front mtb hub to 18" rim?

I'm at the stage of my build where I am trying to build the front wheel. I've bought an 18" rim and a Vector hub (room for 2 discs https://vectorebike.com/bike/other/disc-front-hub).Once they arrived I took some measurements and have settled on 193mm spokes after deciding on doing a 2 cross lac...
by cg_ebiker
Nov 21 2020 4:04pm
Forum: EBike General Discussion
Topic: Ebike ignition
Replies: 2
Views: 209

Re: Ebike ignition

I use a sabvoton and there's a connector called 'e-lock' which disables the controller until the two wires are connected by the ignition switch. Your controller might have a similar connector or it might not need one in which case it isn't needed.
by cg_ebiker
Nov 21 2020 6:33am
Forum: EBike General Discussion
Topic: Does anyone have a broken Sabvoton?
Replies: 1
Views: 141

Does anyone have a broken Sabvoton?

I was testing my motor a few weeks ago and used some jumper wires between the Sabvoton and the motor. I only found out after I 'killed' my sabvoton that one of the wires had a very high resistance so must have confused the controller into sending out power? Anyway, I've been diagnosing and testing e...
by cg_ebiker
Nov 14 2020 9:57am
Forum: EBike Technical
Topic: Wheel won't move and screeches!
Replies: 1
Views: 141

Re: Wheel won't move and screeches!

Well this is embarassing... :lol: Turns out I was using a faulty wire between the VESC and the motor. Now the motor spins normally but the Sabvoton still got damaged somehow :confused: . I'm trying to figure out what's gone wrong. It seems to try to start up but then very quickly turns off and repea...
by cg_ebiker
Nov 14 2020 6:24am
Forum: EBike Technical
Topic: Wheel won't move and screeches!
Replies: 1
Views: 141

Wheel won't move and screeches!

I need to add some ferrofluid to my wheel at some point anyway so I decided to practice getting the motor open. First I tried using a crowbar but popped off the wrong side (wire side) :roll: ! I then used a gear puller to properly remove the stator and it all seemed fine. There are a few potential i...
by cg_ebiker
Oct 16 2020 11:49am
Forum: EBike General Discussion
Topic: 18 vs 19 inch for ebike rims and tyres?
Replies: 4
Views: 256

Re: 18 vs 19 inch for ebike rims and tyres?

Sounds like 18" is the better option for the better acceleration and wider availability. Thanks
by cg_ebiker
Oct 11 2020 1:55pm
Forum: EBike General Discussion
Topic: 18 vs 19 inch for ebike rims and tyres?
Replies: 4
Views: 256

18 vs 19 inch for ebike rims and tyres?

I'm at that stage in my build where I need to choose the rims and tyres and can't decide whether to go for 19" or 18" rims. I was originally going to buy a set of rims and tyres that were 19" for the convenience, but I've looked around and found some good deals on 18" rims. I kno...
by cg_ebiker
Aug 07 2020 12:55pm
Forum: EBike Technical
Topic: Is it ok to use 60v on a 48v breaker?
Replies: 2
Views: 106

Re: Is it ok to use 60v on a 48v breaker?

Ok thanks, sounds like some good advice. Hopefully it will never actually be needed but it's not like I'm putting 200v through it so I think I'll stick with it.
by cg_ebiker
Aug 07 2020 9:02am
Forum: EBike Technical
Topic: Is it ok to use 60v on a 48v breaker?
Replies: 2
Views: 106

Is it ok to use 60v on a 48v breaker?

I'm thinking of putting a circuit breaker in series with my main positive power wire just in case the controller and BMS went bang, it would be an additional way of saving the battery. I've found this (https://www.carbuilder.com/uk/200-amp-surface-mount-circuit-breaker) which offers the current I wo...
by cg_ebiker
Jul 27 2020 4:17am
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Re: Best high current connector

I think that most large gauge connectors are crimp because of how hard it would be to heat large scale connectors. Can you imagine the size of iron you would need for 4, 2, 1 or larger gauge wire? The copper would suck the heat away like crazy! Crimping works great when properly done. Precisely! Ni...
by cg_ebiker
Jul 25 2020 1:35pm
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Re: Best high current connector

I like XT150's. Easy to disconnect and pretty easy to solder if you have a decent iron. You never see a solder-only high current connector in industrial machinery. Crimping is not only much faster and easier to do, it’s also much more reliable. I like the form factor of XT90s etc., but I would only...
by cg_ebiker
Jul 22 2020 1:03pm
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Re: Best high current connector

Tommm wrote:
Jul 22 2020 12:35pm
These and the anderson look terrible from a water/dustproofing standpoint. Just huge ugly blocky plastics. Not for ebikes.
It's all in an enclosed metal frame (enduro frame) so I'm not worried about water and dust
by cg_ebiker
Jul 21 2020 3:24pm
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Re: Best high current connector

Ok, I think anderson it is! I've already bought a hydraulic crimp for some lugs so I can use that. Thanks for the help!
by cg_ebiker
Jul 21 2020 11:37am
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Re: Best high current connector

Hopefully I won't have to disconnect very often at all, but as I said it's a tight space so the way the andersons clip together is very appealing. I also need something that can be crimped to and not sure if the bullet connectors offer that?
by cg_ebiker
Jul 21 2020 3:58am
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Re: Best high current connector

...8 kw ebike ...150A ...3-4 AWG wires Up the planned voltage. You will save money and weight in wiring alone. :D Andersons are expansive but hard to beat for safety and reliability. Any big crimped connector in a safe housing will be expansive. I wish I could, but the batteries I've chosen are hig...
by cg_ebiker
Jul 21 2020 2:48am
Forum: EBike General Discussion
Topic: Best high current connector
Replies: 33
Views: 1531

Best high current connector

Hi everyone, I'm building my own 8wk ebike and have got to the point where I need to put connectors on the ends of the battery pack. Originally I was thinking of using anderson connectors as they looked very suitable and easy to use. However given that I need them to carry 150a and fit a 3-4awg wire...
by cg_ebiker
Jun 27 2020 8:04am
Forum: Battery Technology
Topic: 2 14s lipo packs in parallel or series?
Replies: 6
Views: 300

Re: 2 14s lipo packs in parallel or series?

Yes, thanks for pointing that out. When I thought about it (I've ordered the cells now) I realised it would mean only having to run the balance leads once, and the 2p busbars were cheaper so win win!
by cg_ebiker
Jun 27 2020 5:55am
Forum: Battery Technology
Topic: co20b good idea for ebike?
Replies: 1
Views: 147

co20b good idea for ebike?

After a lot of research, I've settled on some CO20b cells that jimbob01 is selling here on the forum. They offer incredible capacity and discharge (40Ah and >200A discharge for just a 2p pack!) I'm building a high power ebike, hopefully around 8kW and just wanted to see if anyone could see a reason ...
by cg_ebiker
Jun 19 2020 1:37am
Forum: Battery Technology
Topic: 2 14s lipo packs in parallel or series?
Replies: 6
Views: 300

Re: 2 14s lipo packs in parallel or series?

As it's going to be in the bike, I'd ideally have a single charge port and do it through the BMS rather than having to connect wires to the individual packs. This (https://www.cloudsto.com/ebikes/bms-1/smart-bms-8-24s-for-vbms-detail.html) is the bms I want to use and it has 200mA balance current an...
by cg_ebiker
Jun 18 2020 3:14pm
Forum: Battery Technology
Topic: 2 14s lipo packs in parallel or series?
Replies: 6
Views: 300

2 14s lipo packs in parallel or series?

I am building an ebike and plan to use some C020 high capacity lipo cells at 14s 2p to give me <200A continuous discharge and 40Ah! (I only plan to use 150A max so should be a breeze for these!) Due to the size of the frame opening, I cannot create 1 large pack with two rows of 14 cells. I am going ...
by cg_ebiker
May 15 2020 6:18am
Forum: Battery Technology
Topic: Best Li-ion cell model for ebike pack?
Replies: 16
Views: 959

Re: Best Li-ion cell model for ebike pack?

The more I think about it, the more I'm leaning towards the c020 cells. They offer great energy density for the price and can easily be bolted together for easy maintenance or upgrades.If I was going to use li-ion, it would probably be the 40T but interesting to hear that some cells often fail in a ...
by cg_ebiker
May 13 2020 7:52am
Forum: Battery Technology
Topic: Best Li-ion cell model for ebike pack?
Replies: 16
Views: 959

Re: Best Li-ion cell model for ebike pack?

Thanks for pointing out the Samsung 40!. As you say it is basically identical apart from being 4000mAh instead of 4200. I'd probably trust it more than the molicel if they are a clone anyway. Same price as well. I'll look in to them a bit more