Search found 236 matches

by atarijedi
Sep 19 2019 7:08am
Forum: E-Bike General Discussion
Topic: High Amperage BMS Reccomendation
Replies: 12
Views: 1756

Re: High Amperage BMS Reccomendation

If you are willing to spend the money, you could use the BMS24T from Chargery. It supports up to 24S, and up to however much current you want I believe. It uses 1 or 2 external contactors (relay) to control charging/discharging. So for 500A, you would just need a contactor that can support 500A, the...
by atarijedi
Apr 19 2019 7:46pm
Forum: Items for Sale - New
Topic: PV NextGen Controller FOC compact 150v 22kw Max - $499
Replies: 128
Views: 6480

Re: PV NextGen Controller FOC compact 150v 22kw Max - $499

Are you taking possible feature requests? There is a feature on the Mobipus controllers that I'd like to see on a PV controller. It's called Auto FOC I believe. AFAIK, it works like this, as soon as you hit a certain speed (as programmed into the controller), it will automatically enable FOC so you ...
by atarijedi
Apr 03 2019 9:18pm
Forum: Motor Technology
Topic: Installing CA 3 thermistor temperature sensor in QS motor
Replies: 4
Views: 339

Re: Installing CA 3 thermistor temperature sensor in QS motor

When sealing it back up, use RTV silicone gasket, you can get it at any auto supply shop.

Also, while it's open, maybe think about adding some statorade if you haven't, it will help keep the motor running cooler.
by atarijedi
Apr 03 2019 9:14pm
Forum: E-Bike Technical
Topic: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)
Replies: 2104
Views: 281667

Re: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)

I wanted a 18” wheel but I got a great deal on a 3.5T in a 17” rim with a matching 19” front. I run a 3.00 Shinko 241 tire on the rear and a 2.75 on front. Bigger is always better. I wanted to run a 3.5 with a 18” rim........ Go with a 3.00 minimum or better yet 3.50 if it will fit! Tom I'd like to...
by atarijedi
Mar 07 2019 1:41am
Forum: Motor Technology
Topic: Controller for QS205 50H V3 4t
Replies: 13
Views: 955

Re: Controller for QS205 50H V3 4t

Mobipus 72200, you can get them over on Ballaratebikes.com
by atarijedi
Mar 05 2019 1:48am
Forum: Large EV General Discussion
Topic: Lightweight AWD Sportscar
Replies: 47
Views: 6352

Re: Lightweight AWD Sportscar

Will you be driving this in the winter? Because it seems kinda low for snow, or speed bumps, lol. Anyways, for the motors, you should check to see if Revolt can do Halbach Arrays with the magnets. It should increase the efficiency of the motor, and higher power density. Might cost a bit more, becaus...
by atarijedi
Mar 05 2019 1:32am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Motor options for sportbike conversion
Replies: 22
Views: 1468

Re: Motor options for sportbike conversion

Depends on how you want to set up the bike. Do you want a mid-motor with sprockets and chains (or belts and pulleys like Zero). You have less space for batteries, a con, but also have less unsprung weight, a pro? Or do you want a hub motor with no sprockets or chains, more space for batteries, but a...
by atarijedi
Feb 28 2019 10:49pm
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 2041

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

I think you're confusing the stator iron with the back-iron iron. The halbach array eliminates the need for back-iron behind the magnets, but it doesn't get rid of the laminated iron in the stator core which is where most of the iron weight in a motor is located. For instance, in our Grin motor, th...
by atarijedi
Feb 25 2019 10:49pm
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 2041

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

I'd like to see some more halbach array motors. Yes, they are more expensive because they are more complex to put together, but they are much lighter because you don't need a metal armature core, thus no laminations. So you could have very, very, light rotors. The weight would be mostly from the win...
by atarijedi
Jan 10 2019 12:48am
Forum: Battery Technology
Topic: High current weld strips
Replies: 9
Views: 497

Re: High current weld strips

I would do what Tesla does, have individual fuse wires going from each cell to a bus bar. https://endless-sphere.com/forums/viewtopic.php?t=79950 https://endless-sphere.com/forums/viewtopic.php?t=88039 You will be able to size the wire better, and get much higher currents, than if you use nickel str...
by atarijedi
Jan 10 2019 12:44am
Forum: Battery Technology
Topic: Spot welder capable of 24 awg fuse wire?
Replies: 2
Views: 288

Re: Spot welder capable of 24 awg fuse wire?

The best I've seen is the latest aulakiria running a 4S battery, capable of doing up to .15 copper strip.
by atarijedi
Dec 11 2018 1:35am
Forum: E-Bike General Discussion
Topic: Another Stealth bomber (clone) build
Replies: 223
Views: 20043

Re: Another Stealth bomber (clone) build

I think there is little talk on the mobipus controllers, because the manufacturer had stopped selling them to retailers and wanted to do OEM only. I guess they are selling them again. Not sure when they changed their minds. Edit: Seems in March of this year they decided to starting selling them to c...
by atarijedi
Sep 13 2018 3:32am
Forum: Motor Technology
Topic: 15+kw hub motor?
Replies: 9
Views: 1064

Re: 15+kw hub motor?

Ill most likely be running 30s so 126 volt at full charge if my math doesnt suck too much. I know qs205 got many choices for wiring turns. Was just wondering if there was something "better". i know theres cromotor that seems to be very similar too. I got a crystalyte atm but they dont seem to make ...
by atarijedi
Sep 07 2018 11:18pm
Forum: Motor Technology
Topic: 15+kw hub motor?
Replies: 9
Views: 1064

Re: 15+kw hub motor?

You can supposedly hit 20kW (max) with a QS205 and hubsinks+statorade.

What will your pack voltage be though? The max voltage will determine the top speed.
by atarijedi
Sep 04 2018 2:45am
Forum: E-Bike General Discussion
Topic: My (almost)complete Electric Enduro
Replies: 10
Views: 1213

Re: My (almost)complete Electric Enduro

Looking similar to the one I'm building, my headlight even looks similar.

I have a different frame though.

Looks good!
by atarijedi
Sep 04 2018 2:37am
Forum: E-Bike General Discussion
Topic: Lipo Battery - HobbyKing to Canada, questions
Replies: 17
Views: 1199

Re: Lipo Battery - HobbyKing to Canada, questions

If you are willing to spend the money, Tattu makes amazing LiPo batteries. You can pick them up from GetFPV.com.
by atarijedi
Sep 04 2018 2:29am
Forum: Battery Technology
Topic: High balance current BMS please help
Replies: 6
Views: 554

Re: High balance current BMS please help

How much are you willing to spend? The BMS24T is a pretty badass system, but you need to buy a bunch of accessory items, like contactors, to use it. It can do 1.2A/cell.

It's about $330USD, that includes shipping.
by atarijedi
Aug 07 2018 1:38pm
Forum: E-Bike Technical
Topic: Enduro frame builders, how do you waterproof the holes you drill in the frame?
Replies: 0
Views: 188

Enduro frame builders, how do you waterproof the holes you drill in the frame?

All the previous frames I've used, typically came with pre-cut holes and grommets, going into the battery box area. My new frame has no holes, and I need to figure out a way to best insulated the interior battery area. I was thinking of using cable glands, maybe rubber grommets again. But I figured ...
by atarijedi
Aug 04 2018 1:39pm
Forum: Battery Technology
Topic: Anyone actually used the Boston Power 5300mAh cells?
Replies: 17
Views: 1823

Re: Anyone actually used the Boston Power 5300mAh cells?

It's just 2 18650s put in parallel, is it not? I don't see the point.
by atarijedi
Jul 17 2018 10:11pm
Forum: E-Bike Technical
Topic: EEB parts and support info
Replies: 54
Views: 3982

Re: EEB parts and support info

Green Werks asked me to post a little here so for what it's worth here we go. GW bought a set of forks and raved abuot them so much I bought a set and figured I would put them on a Luna cargo frame I have. Then the next thing you know he buys an EEB and carries on about that. I kept telling myself ...
by atarijedi
Jul 15 2018 5:48pm
Forum: E-Bike Technical
Topic: How do I set up a relay for BMS to turn positive pack voltage off
Replies: 8
Views: 590

Re: How do I set up a relay for BMS to turn positive pack voltage off

The BMS I have uses an external shunt for total current measurement to/from the battery pack (on the negative), individual cell voltage measurements, as well as 2 relay control outputs for charging, and discharging. Amongst other features (like an audible alarm). So for discharging, when it detects ...
by atarijedi
Jul 15 2018 5:23pm
Forum: E-Bike Technical
Topic: How to correctly estimate range and maximum power
Replies: 5
Views: 418

Re: How to correctly estimate range and maximum power

Check out the Trip Simulator over on Grin Techs (ebikes.ca) website. Get the specs as close as possible to what bike you have.

For input type, you can change it to Google Maps, and then plan out a route, and it will show you how much power you will use on that route.
by atarijedi
Jul 15 2018 5:13pm
Forum: E-Bike Technical
Topic: Spot welding fuses to individual 18650 cells?
Replies: 100
Views: 6297

Re: Spot welding fuses to individual 18650 cells?

That isn't exactly how it works. Adding resistors in parallel isn't actually lowering the resistance, it's adding another path for the current. If you have a 5V source running through a 1Ohm resistor, the current through the resistor is 5A. If you add a 2nd 1Ohm resistor in parallel, you now have 2...
by atarijedi
Jul 14 2018 2:12pm
Forum: E-Bike Technical
Topic: Spot welding fuses to individual 18650 cells?
Replies: 100
Views: 6297

Re: Spot welding fuses to individual 18650 cells?

Thanks for the response. I am very curious about this. The solder I use has a 60/40 Tin/Lead ratio (see link below). Since both tin and lead have higher resistance than copper, how can the addition of this solder actually decrease the resistance of the bus bars? I certainly hope your comment is tru...
by atarijedi
Jul 11 2018 3:30pm
Forum: E-Bike Technical
Topic: 20/21700 Batteries, are they here or what?
Replies: 2
Views: 646

Re: 20/21700 Batteries, are they here or what?

I have only seen 20700 4250mAh 15A Sanyo-Panasonic, and 21700 4800mAh 10A Samsung though. That is, in terms of batteries I trust. There are lots of rebranded ones out there, like EFAN and EFest, which never turn out as good as they are branded. You can get those 21700 and 20700 batteries from nkon.n...