Search found 31 matches

by bigchief
Jul 31 2019 5:12pm
Forum: E-Bike Technical
Topic: Upload Your Circuit Schematics & Requests Here...
Replies: 530
Views: 177951

Re: Upload Your Circuit Schematics & Requests Here...

This thing is really kicking my butt since I'm reduced to trial and error. I took out the SMD for the 2000 and 2200 ohm resistors and replaced them both with higher and lower resistance. I also took out the 25k resistor and replaced that with higher and lower resistance. None of these value changes ...
by bigchief
Jul 27 2019 1:58pm
Forum: E-Bike Technical
Topic: Upload Your Circuit Schematics & Requests Here...
Replies: 530
Views: 177951

Re: Upload Your Circuit Schematics & Requests Here...

Removing the resistor makes it cut off just about instantly. I think I'm messing with the wrong resistor. Maybe it's actually the really tiny one next to it marked "222" and not the "2001". I was using file hosting services because the forum caps at 512kb which isn't that high of a resolution. Here'...
by bigchief
Jul 26 2019 5:13pm
Forum: E-Bike Technical
Topic: Upload Your Circuit Schematics & Requests Here...
Replies: 530
Views: 177951

Re: Upload Your Circuit Schematics & Requests Here...

I have a 48v ebike controller that I'm trying to adjust the LVC down for a 36v battery. I'm really sleep deprived at the moment and my brain isn't working well enough to sort out the exact resistor I'm to replace: Check out this thread: https://endless-sphere.com/forums/viewtopic.php?f=2&t=101242&p...
by bigchief
Jul 26 2019 5:04pm
Forum: E-Bike Technical
Topic: I think I need a new controller.......LVC occuring 39V, not 30V.
Replies: 16
Views: 530

Re: I think I need a new controller.......LVC occuring 39V, not 30V.

I have a very similar looking controller: https://imgur.com/a/Z2u2Zfv Mine controller is 48v, and I want it to run on my 36v battery. If I have the 36v battery charged to 42 volts it will run until I try to hit a high speed or climb a hill, when it cuts out from the voltage drop. I tried to do the s...
by bigchief
Jul 26 2019 3:22am
Forum: E-Bike Technical
Topic: Upload Your Circuit Schematics & Requests Here...
Replies: 530
Views: 177951

Re: Upload Your Circuit Schematics & Requests Here...

I have a 48v ebike controller that I'm trying to adjust the LVC down for a 36v battery. I'm really sleep deprived at the moment and my brain isn't working well enough to sort out the exact resistor I'm to replace: https://imgur.com/a/Z2u2Zfv Would anyone be able to eyeball that pcb and point out the...
by bigchief
Feb 23 2018 12:23am
Forum: E-Bike General Discussion
Topic: Most efficient end-to-end pedal generator?
Replies: 6
Views: 593

Re: Most efficient end-to-end pedal generator?

I can't really help with the hook up, but for sure your bike hub motor will make a decent, efficient, generator. Others have produced the same thing commercially using a basic direct drive rear hub motor. Use the power to keep a cheap lead 12v battery full. I wouldn't want to use a lead-acid as the...
by bigchief
Feb 22 2018 2:44am
Forum: E-Bike General Discussion
Topic: Most efficient end-to-end pedal generator?
Replies: 6
Views: 593

Most efficient end-to-end pedal generator?

I'm trying to power a PC from a bike pedal generator, and have some parts at my disposal, but I wanted to figure out the most efficient setup possible. The PC uses a "Pico power supply", so it is powered from 12 volts DC. It consumes between 40-160 watts depending on if I am gaming with the GPU or n...
by bigchief
Feb 16 2017 5:39pm
Forum: Battery Technology
Topic: How should I design this EV battery system?
Replies: 7
Views: 610

Re: How should I design this EV battery system?

Not into solar, but why not just hook the panels up in series to get the desired voltage of ~350VDC, then hook them direct through power diodes to the battery pack. Well, charging needs to be more controlled and tapered when charging lithium ion. As long as you never exceed max no load voltage, the...
by bigchief
Feb 13 2017 5:19pm
Forum: Battery Technology
Topic: How should I design this EV battery system?
Replies: 7
Views: 610

Re: How should I design this EV battery system?

Not into solar, but why not just hook the panels up in series to get the desired voltage of ~350VDC, then hook them direct through power diodes to the battery pack. Well, charging needs to be more controlled and tapered when charging lithium ion. Your project is a bit out of scope for most people o...
by bigchief
Feb 06 2017 6:00pm
Forum: Battery Technology
Topic: How should I design this EV battery system?
Replies: 7
Views: 610

How should I design this EV battery system?

I currently have 14 Tesla 24v battery modules (75kwh total) and I'm going to wire them in series for 312v nominal for an EV. There's two ways I want to charge the battery pack: 1) From any standard J1772 public charge station (PlugShare, etc.) at a minimum of 6.6kw charge rate 2) This is a box-van t...
by bigchief
Sep 13 2016 11:55am
Forum: E-Bike Non-hub Motor Drives
Topic: Would this pinion with rim-rack drive idea work?
Replies: 8
Views: 901

Re: Would this pinion with rim-rack drive idea work?

It's an idea that seems simple at first but will probably be a lot of work to make it effective. Aside from manufacturing the ring, tooth meshing will be a problem as the teeth won't be parallel due to the difference in inside and outside circumference. You'd need a pinion with slightly tapered tee...
by bigchief
Sep 13 2016 9:36am
Forum: E-Bike Non-hub Motor Drives
Topic: Would this pinion with rim-rack drive idea work?
Replies: 8
Views: 901

Re: Would this pinion with rim-rack drive idea work?

I was thinking of that, I could use an aero tri-spoke or full disk wheel; they are heavier than spokes but don't go out of true. A well built wheel with a high spoke count (like those used for tandem bikes) might be stiff enough too. If I mounted the motor directly to a brake arm, I could use the no...
by bigchief
Sep 12 2016 11:57pm
Forum: E-Bike Non-hub Motor Drives
Topic: Would this pinion with rim-rack drive idea work?
Replies: 8
Views: 901

Re: Would this pinion with rim-rack drive idea work?

Well, if I was going DIY, I suppose I could 3D print a ring in nylon easily enough to test with, or if I wanted to fabricate a piece of UHMWPE, maybe I could CNC a mold from metal, buy a long rod of UHMWPE, and heat it in an oven to try to thermoform it into the mold? I've done stuff like that with ...
by bigchief
Sep 12 2016 9:23pm
Forum: E-Bike Non-hub Motor Drives
Topic: Would this pinion with rim-rack drive idea work?
Replies: 8
Views: 901

Would this pinion with rim-rack drive idea work?

I was thinking of ways to use a high-RPM RC motor on an ebike, and I had an idea to attach the motor to the fork, similar to the way you would attach a dynamo. Instead of engaging with the tire like a dynamo or a friction-drive motor would, instead I would attach a steel pinion to the head of the mo...
by bigchief
Jun 22 2016 1:50pm
Forum: Large EV General Discussion
Topic: Need help designing a multipurpose low-speed camper platform
Replies: 0
Views: 375

Need help designing a multipurpose low-speed camper platform

I've been working on a project where I was going to add motorcycle-grade in-hub motors to a ~2000lbs camper-trailer, so that it can help push itself while my small EV car (Smart Electric) pulls it. I'm realizing that the better idea might be to just skip the car and hub motors, and create a self-pro...
by bigchief
Mar 19 2011 12:57am
Forum: Motor Technology
Topic: Got a free AC motor, it is strong enough for EV conversion?
Replies: 12
Views: 1449

Re: Got a free AC motor, it is strong enough for EV conversi

Some Googling seems to suggest that this is a discontinued "Belt Drive Condenser" from 1989, whatever that means. Could 15 Horsepower take a very light car (like a Geo Metro) to highway speeds? Or would this be more of an "around town" thing if it works? Is this a three phase AC?
by bigchief
Mar 19 2011 12:38am
Forum: Motor Technology
Topic: Got a free AC motor, it is strong enough for EV conversion?
Replies: 12
Views: 1449

Got a free AC motor, it is strong enough for EV conversion?

Hey guys, I've been into EV's ever since I got my electric bike working about a year ago, thanks in no small part to all of you. Since then I've been dreaming of an electric car conversion. Now, seemingly out of nowhere, my boss asked me to toss out an old motor in the basement of our building. I to...
by bigchief
Jul 10 2010 12:21am
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1089

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

OK, so get a load of this: I completely desoldered the leg of the crimped shunt, leaving only the middle shunt in. I was expecting the bike to have it's speed and acceleration gimped. Turns out the bike is now performing *exactly* the same as when I had both shunts in, only without any blown fuses (...
by bigchief
Jul 09 2010 5:25pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1089

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

Sounds good, I just de-soldered a leg and I'll give it a try. Thanks for the help!
by bigchief
Jul 09 2010 4:19pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1089

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

I attached a picture of the controller opened up. Is it these thingies here? There's markings for three of these jumpers, but only two are mounted. the one in front is bigger and has ridges along the top, and the second one is a smooth looking jumper and is shorter. So I should try filing down one o...
by bigchief
Jul 09 2010 2:10pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1089

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

Oh, I might have thought of something. People here talk about shunting (making a solder pool?) on a controller to draw more amps, right? Could I wick away solder from that area or use a small gauge wire or something to limit the current?
by bigchief
Jul 09 2010 1:36pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1089

Re: Blowing 20 Amp fuses on a 500w Direct Drive Hub

Does your controller have current limiting? Does the BMS on your LiFePO4 pack do current limiting? Preferably, the controller should be limiting the current, but BMS often includes a limiter to protect the batteries. Usually the BMS is a sharp cutoff, where the controller will just control the thro...
by bigchief
Jul 09 2010 12:26pm
Forum: E-Bike Technical
Topic: Blowing 20 Amp fuses on a 500w Direct Drive Hub
Replies: 13
Views: 1089

Blowing 20 Amp fuses on a 500w Direct Drive Hub

I just finished my new E-Bike; I'm using a 36v, 10amp rated (20amp peak) 10AH LiFePo4 battery with a 20 amp fuse, a 500 watt Direct Drive hub, and a controller of indeterminate wattage. The setup works great and takes me to 20-25mph without pedaling; the only problem is if I floor the throttle at mi...
by bigchief
Jul 05 2010 7:51pm
Forum: E-Bike General Discussion
Topic: Need fast/cheap motor for 36v 10a LIFEPO4
Replies: 5
Views: 566

Re: Need fast/cheap motor for 36v 10a LIFEPO4

I'd imagine it's whatever comes with the http://www.raybenmotors.com/Conversion%20Kits 500watt kit. I'm not sure what the exact rating is but maybe someone else here has the Rayben kit?
by bigchief
Jul 05 2010 10:11am
Forum: E-Bike General Discussion
Topic: Need fast/cheap motor for 36v 10a LIFEPO4
Replies: 5
Views: 566

Re: Need fast/cheap motor for 36v 10a LIFEPO4

I just won a 36v 500w RayBen on Ebay (with controller, rim/tire, throttle and charger but no batteries) for $125 shipped, it says it's lightly used but sounds like I got it at a steal because it's apparently a BaFang motor. My Lifepo4 had a dead cell but I have a replacement; guess it's time to sold...