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by Drunkskunk
Jun 24 2019 8:16pm
Forum: Battery Technology
Topic: Fantastic BMS And Where To Find Them (?)
Replies: 3
Views: 109

Fantastic BMS And Where To Find Them (?)

So I have a history with BMS going back to my start in Ebikes. My First two tried to murder me. Back in like 2007 I nearly lost my house when a BMS failed and shorted out a lipo pack in my garage. Shortly after, I had a second BMS fail and ruin a second pack. I lost all faith in questionable automat...
by Drunkskunk
Jun 24 2019 3:24pm
Forum: E-Bike General Discussion
Topic: Undervolting question
Replies: 11
Views: 855

Re: Undervolting question

........ the SW900 controller has a setting for voltage - can I use that to set it to 36V and get lower power and maybe longer battery life? the thing is so powerful, I really want to slow it down!..... Nope. setting the controller for 36v will only reset the low voltage cutoff from 40-ish volts to...
by Drunkskunk
Jun 24 2019 6:18am
Forum: Battery Technology
Topic: Battery cell brand qusetions?
Replies: 3
Views: 74

Battery cell brand qusetions?

So I know the usual choice of 18650 cells is Samsung, LG, Sony(Murata), or Panasonic(Sanyo). Generally, anything that isn't one of those 4 is junk, and if the brand has "fire" or "core" in the name, it should be launched from a cannon as far away from you as possible. At least that had been true up ...
by Drunkskunk
Jun 23 2019 7:16pm
Forum: Battery Technology
Topic: Best cheap spotwelder?
Replies: 3
Views: 177

Re: Best cheap spotwelder?

Thanks! All 3 of those look great, and that style wasn't even something I had thought of before asking.
by Drunkskunk
Jun 23 2019 3:20pm
Forum: E-Bike General Discussion
Topic: Cant decide on 36v or 48v mid drive motor
Replies: 5
Views: 162

Re: Cant decide on 36v or 48v mid drive motor

The 48v motor will climb better, have more power, more speed for the same amp limit on the controller. The same wattage battery should cost about the same regardless of voltage. Lets say you have a 36V 17.5AH battery made of 2500mha cells. that would be 70 cells. (10S 7P). A 48v 12.5Ah battery made ...
by Drunkskunk
Jun 22 2019 7:22pm
Forum: Battery Technology
Topic: Best cheap spotwelder?
Replies: 3
Views: 177

Best cheap spotwelder?

So after years of messing with ebikes, I've decided to make the switch to 18650s. But every bike I have is unconventional, and will take custom batteries. The only real solution is for me to start building my own. I'm saving to put a down payment on a house, so I don't have a ton of free cash. Whats...
by Drunkskunk
Jun 22 2019 6:30pm
Forum: Battery Technology
Topic: Copper bus, plating with nickel for spot-welding.
Replies: 10
Views: 398

Re: Copper bus, plating with nickel for spot-welding.

I'm not sure you would ever be able to get deposited nickel thick enough or bonded well enough to work for spot welding. The mechanical properties of Nickel deposited in the plating process and nickel that was melted, pressed, stretched, and shaped are going to be different. What about copper platin...
by Drunkskunk
Jun 22 2019 5:14pm
Forum: General Discussion
Topic: Controller placement question
Replies: 4
Views: 130

Re: Controller placement question

Generalizations are generally generalized for the general public. While it's generally a bad idea to put a controller, a device designed to get hot, in an enclosed environment, it's sometimes perfectly fine. You know your setup best. Did your controller ever get hot before? Do you know how hot it ge...
by Drunkskunk
Jun 21 2019 3:41pm
Forum: E-Bike General Discussion
Topic: combo platter
Replies: 5
Views: 90

Re: combo platter

Your battery, with a continuous rating of 30 amps and a 30 amp BMS means you are are best matched to a 1500 watt or smaller motor kit. Wattage is figured by Volts times Amps. 48V x 30A = 1440 watts. So No, it wouldn't be a good idea to use your battery with a 3000w wheel kit. Understanding how all t...
by Drunkskunk
Jun 21 2019 1:57am
Forum: General Discussion
Topic: 2 stroke gas/350w front hub full Regen project
Replies: 9
Views: 174

Re: 2 stroke gas/350w front hub full Regen project

Welcome to the forum I started to do exactly this once, but then math got in the way. I realized it was actually not going to work. your total range would be less than it would be if you never used regen to fill the batteries. The problem is, you don't get something for nothing. It takes roughly twi...
by Drunkskunk
Jun 19 2019 4:11pm
Forum: E-Bike Build Threads / Photos & Video
Topic: DH Comp Rotomax Mid drive
Replies: 22
Views: 1178

Re: DH Comp Rotomax Mid drive

That thing is seriously awesome. Any plans to make a few and sell them?
by Drunkskunk
Jun 19 2019 11:28am
Forum: General Discussion
Topic: Steampunk Voltmeter?
Replies: 12
Views: 328

Re: Steampunk Voltmeter?

I got the back off, It's just press fit. Pic below. It's hard to tell from my shot, but there is a second thin wire coil wrapped under the heavy copper coil that works for the volt meter on this dual meter version. Now the down side. The volt meter pulls .35 amps at 10 volts. So about 2.8Ω. That mak...
by Drunkskunk
Jun 18 2019 10:14pm
Forum: E-Bike General Discussion
Topic: I'm down a rabbit hole
Replies: 48
Views: 1131

Re: I'm down a rabbit hole

E-HP wrote:
Jun 17 2019 12:53pm

I like how you got the controller to fit neatly behind the seatpost. What kind of controller it that?
Thanks. I think it's a 9 FET greentime, but I have no idea. it came with the motor.
by Drunkskunk
Jun 17 2019 9:28pm
Forum: General Discussion
Topic: Steampunk Voltmeter?
Replies: 12
Views: 328

Steampunk Voltmeter?

So I picked up a 100 year old volt meter to use as a battery gauge on my steampunk bike, and I have a few questions someone here might know the answer to. The case is a pocket watch style case, with no obvious seams. I need to get it open, as it seems to stick. I also need to modify it a little. Any...
by Drunkskunk
Jun 17 2019 4:42pm
Forum: E-Bike General Discussion
Topic: Direct Drive Gearless Hub Motor Drag Technical Q
Replies: 14
Views: 245

Re: Direct Drive Gearless Hub Motor Drag Technical Q

Welcome to the forum. Yes, direct drive motors do have a little drag. It's often called Motor Cogging , due to the way it feels at low RPMs. For a 500 watt motor, the drag is about like running a treaded tire instead of a slick on a normal bike. You'll be able to tell you aren't as fast, but it won'...
by Drunkskunk
Jun 17 2019 12:32pm
Forum: E-Bike General Discussion
Topic: I'm down a rabbit hole
Replies: 48
Views: 1131

Re: I'm down a rabbit hole

Welcome to the forum. Lets start with the good. EM3ev is a great company to deal with. you're right about the 48v 10Ah battery, if you keep speeds in the 15mph range. Building your own bike is more rewarding, and you can build a better bike for your money. 1.2K is a good working budget, and you shou...
by Drunkskunk
Jun 16 2019 8:34pm
Forum: E-Bike General Discussion
Topic: New battery or new bike?
Replies: 10
Views: 294

Re: New battery or new bike?

The only wearing parts on a direct drive hub motor are the bearings. Those are only good for 50-100 years, and 250,000 - 500,000 miles or so. And they cost a staggering $1.50 each. And there are so many of them throughout the motor. Well, 2 of them. So if your kids inherit your bike, and pass it to ...
by Drunkskunk
Jun 16 2019 5:14pm
Forum: E-Bike Build Threads / Photos & Video
Topic: What to do with a Free Sondors?
Replies: 12
Views: 280

Re: What to do with a Free Sondors?

Welcome to the forum yeah, it will pee it's self on any real hill without pedal assist. 350 watts is really just meant to assist the rider. It's enough power for 15-18mph on flat ground when rode like a motorcycle. it will handle ~5% grade hills ok, but anything more, and it will be begging you loud...
by Drunkskunk
Jun 16 2019 4:12pm
Forum: E-Bike Build Threads / Photos & Video
Topic: My Monster!
Replies: 6
Views: 352

Re: My Monster!

Awesome build.
Any chance you would share the files for those 3D printed parts? I really like that connector.
by Drunkskunk
Jun 16 2019 4:05pm
Forum: General Discussion
Topic: Red sox bicycle.
Replies: 2
Views: 124

Re: Red sox bicycle.

bestbikesusa sold Licensed collage and professional team logo painted bikes for just about any team. They wern't very successful, so only selling 3 of that sized bike with Red Sox livery is believable. The bike it's self is of the lowest end of walmart quality. Commonly called BSO, "Bike Shaped Obje...
by Drunkskunk
Jun 16 2019 2:10pm
Forum: E-Bike General Discussion
Topic: Hub motor recommendation?
Replies: 9
Views: 352

Re: Hub motor recommendation?

If you're looking at the Mac 6T, you're looking at bicycle hubs. A geared bicycle hub might be small enough to fit in an 8 inch rim if you have access to a machine shop. But being a geared hub, they make noise. Some are fairly quiet, like the MAC motor, but none are as silent as a direct drive hub. ...
by Drunkskunk
Jun 13 2019 10:42am
Forum: E-Bike Technical
Topic: Help,911 ...was riding in the rain and
Replies: 8
Views: 228

Re: Help,911 ...was riding in the rain and

Sounds like you blew the controller, and have only 2 phases working. What motor and controller are you using?
by Drunkskunk
Jun 12 2019 1:42am
Forum: E-Bike Technical
Topic: Low voltage systems
Replies: 3
Views: 192

Re: Low voltage systems

Massively thick wires, Special high amperage controllers, much more expensive switching gear, putting more strain on batteries by drawing high amps. Volts X Amps = Watts. It's easier and cheaper to handle higher voltage than it is to handle higher amperage. Other than that, no real reason. Watts are...
by Drunkskunk
Jun 11 2019 2:53pm
Forum: E-Bike General Discussion
Topic: Half way through a conversion, need help finishing it
Replies: 16
Views: 381

Re: Half way through a conversion, need help finishing it

Welcome to the forum. Can you return that kit? it doesn't look like it will meet your needs, and other kits on Amazon might work better for you. The motor is fine, actually possibly very good if it's manufactured by who I think it is. It's the rest of the parts that seem to be a mismatch. The contro...