Search found 1850 matches

by Voltron
Oct 12 2019 11:30pm
Forum: Battery Technology
Topic: Increasing range with parallel li ion batteries
Replies: 22
Views: 448

Re: Increasing range with parallel li ion batteries

The ratings aren't a direct indicator of how much you will get, as it changes with the discharge rate. What that is saying is it holds roughly 2.2ah, if you take the electricity out at .2 c discharge rate. It doesn't mean it you put 10 together for 22ah that you can pull 22 amps out for an hour. Its...
by Voltron
Oct 12 2019 11:11pm
Forum: E-Bike General Discussion
Topic: is a motor dedicated to 36v or 48v
Replies: 7
Views: 233

Re: is a motor dedicated to 36v or 48v

The heat build up goes with the watts... running higher volts, but lower amps for the same power can reduce overheating.
by Voltron
Oct 12 2019 12:57am
Forum: Battery Technology
Topic: Increasing range with parallel li ion batteries
Replies: 22
Views: 448

Re: Increasing range with parallel li ion batteries

Exactly... I wouldn't go that low on voltage on a 10s though.

I think you can run it on the charger also and see how much you're putting in...
by Voltron
Oct 11 2019 5:56pm
Forum: Battery Technology
Topic: Increasing range with parallel li ion batteries
Replies: 22
Views: 448

Re: Increasing range with parallel li ion batteries

You can buy RC wattmeters pretty cheap that will log how much actual watthours you're getting out of a pack...
WattsUp6.jpg
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by Voltron
Oct 11 2019 5:47pm
Forum: Battery Technology
Topic: Increasing range with parallel li ion batteries
Replies: 22
Views: 448

Re: Increasing range with parallel li ion batteries

Using 5 amps isn't the same thing as amp hours... .

Re the one picture, I think they're actually uninsulated solid copper wire, not solder. But yes, that's some big blobs all over.
by Voltron
Oct 10 2019 6:28pm
Forum: Battery Technology
Topic: Increasing range with parallel li ion batteries
Replies: 22
Views: 448

Re: Increasing range with parallel li ion batteries

These are plucked from the sphere, so sorry if I don't give proper name credit. The first one shows basically what you're talking about... A single row of cells, paralleled together, then hooked to the next row. 25r_welds.jpg The same kind of thing, but soldered, with the red lines showing where som...
by Voltron
Oct 10 2019 12:33pm
Forum: E-Bike General Discussion
Topic: How to test a motor
Replies: 6
Views: 144

Re: How to test a motor

If the battery is actually putting out voltage, you can usually probe the hall wire plug, and the throttle, and see if they're getting voltage to see if the controller is alive. Pictures help... Without seeing the plugs it's harder to tell you what to poke.
by Voltron
Oct 09 2019 11:48am
Forum: E-Bike General Discussion
Topic: is a motor dedicated to 36v or 48v
Replies: 7
Views: 233

Re: is a motor dedicated to 36v or 48v

Re the motor voltage, most systems are designed to run at a legal speed somewhere, so the 36v is wound to come out at roughly that speed. A 48v is wound for less rpms per volt, so it goes the same roughly legal top speed. It won't damage them changing voltage... It just changes the speed they were d...
by Voltron
Oct 08 2019 1:02pm
Forum: E-Bike General Discussion
Topic: haibike power curve modification
Replies: 7
Views: 177

Re: haibike power curve modification

Yes, and big company systems like that are just that...a system, and built for manufacturing efficiency, so every wire and every connector is built just as big as it needs to be. If you up the power thru the software, then maybe your main battery connector melts a little. Then you beef that up, and ...
by Voltron
Oct 08 2019 12:39pm
Forum: E-Bike General Discussion
Topic: BMS defect or unbalanced cells
Replies: 27
Views: 1009

Re: BMS defect or unbalanced cells

Yes, just bulk charging with them unbalanced is bad. If you're going to go that route, you need to either use small lightbulbs or something to discharge each of the high groups, but you really need to stay near it and not forget you're draining a group and let it go too low. Or charge up each low gr...
by Voltron
Oct 08 2019 11:38am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

Yes, that's the ocean, with some islands in the distance.

Edit.. In commuter mode I just run one battery module which makes it a lot easier to move around when off the bike. But then I don't punch it drag racing cars away from lights to limit the amp draw, which is hard 😀
by Voltron
Oct 07 2019 1:52am
Forum: E-Bike Technical
Topic: How to access and remove the battery of this ebike?
Replies: 36
Views: 607

Re: How to access and remove the battery of this ebike?

It's these things... Dendrites. The time scale is 42 hours. They grow. How much they grew inside your battery is a guess.

Dendrites_preview.jpg
Dendrites_preview.jpg (207.83 KiB) Viewed 43 times
by Voltron
Oct 06 2019 9:51pm
Forum: E-Bike Technical
Topic: How to access and remove the battery of this ebike?
Replies: 36
Views: 607

Re: How to access and remove the battery of this ebike?

They're overcharging it to get it to blow up of course, but that's the same kind of currents that will go thru a cell when the dendrites start piercing the separator layers and start shorting out the cell from inside... Again, it's not about charging at low amps or about fuses... It won't be a dange...
by Voltron
Oct 06 2019 7:28pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

https://youtu.be/FQAOSU6-LgY

And that's 90k at this sort of light riding around.. 😋

The middle part of the ride is just a lot of hypnotic back and forth with serious speed bursts in the later part... The last 30 sec is a great look of my hometown. Come for a ride sometime!
by Voltron
Oct 06 2019 7:24pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

And if you're building your own chargers, and resoldering shunts, then YOU'RE awesome :thumb:
by Voltron
Oct 06 2019 7:22pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

That's part of why I run the big pack a lot, as it shares the amp load over a lot of low grade cells. I get about 30k a module, so full pack is 90k-ish
by Voltron
Oct 06 2019 2:47pm
Forum: E-Bike Technical
Topic: How to access and remove the battery of this ebike?
Replies: 36
Views: 607

Re: How to access and remove the battery of this ebike?

Not trying to be discouraging, but if you think about the layers of safety interfaces between the BMS, the charger, and the battery that are meant to keep you from doing what you're trying to do, maybe give in and recycle that thing?
by Voltron
Oct 06 2019 12:01pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

And if it's working don't bother changing it until next time you take the wheel out.. . But you don't need another nut on the inside. In your last picture, where the two washers are between the frame and the brake cover, that's where the skinny nut you still have on the outside goes.
by Voltron
Oct 06 2019 11:56am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

Glad it's working out. And that's only 2/3 of the full pack! It's 3 modular units so I can run it lighter for short range. And the frame is surprisingly unmodified. It's a first generation Yuba Mundo cargo bike. The rack was bolted on on the early models instead of welded, so when taken off makes it...
by Voltron
Oct 05 2019 4:30pm
Forum: E-Bike Technical
Topic: Hub motor spins, wheel does not?
Replies: 5
Views: 154

Re: Hub motor spins, wheel does not?

Yeah... What he said.☝️ And yes, there is a clutch in there... It lets the wheel coast when the power is off. I don't know the exact bike... If it's front motor with rim brake, you might be able to just turn it around. If it's rear, or disc brake, or both, you have to start swapping the colored moto...
by Voltron
Oct 05 2019 1:09pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

Your motor looks to be about 97% the same as mine... it started out in a scooter too. But yours has the better aluminum stator instead of the stamped steel one on mine.
dirt.jpg
dirt.jpg (38.47 KiB) Viewed 140 times
:thumb:
by Voltron
Oct 05 2019 11:56am
Forum: Motor Technology
Topic: Help me
Replies: 1
Views: 122

Re: Help me

If it was sold for 72v, the motor will handle much more than that, in bursts anyway. It might melt, but it's not going to fly apart from the rpms, or burn thru the insulation. The whole rest of the system starts getting really sparky as you go up... You'll be surprised how much connectors start jump...
by Voltron
Oct 05 2019 10:37am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

The skinny nut is meant to hold the assembly in place when the wheel is off the frame. currie-12-1-2-x-3-0-complete-rear-wheel-assembly-with-drum-brake-for-schwinn-ezip-scooters-1.jpeg When it's tight enough, it should be pressing the brake cover against the inside spacer, which then rides on the in...
by Voltron
Oct 05 2019 10:26am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

You're right...I thought from the outside cover it was the band type. But I do think your washers and nuts got moved around before. Usually the skinny nut that is on the outside is the one thats supposed to be against the brake plate, and the flared nut with the knurling is the axle nut. Maybe one o...
by Voltron
Oct 02 2019 7:11pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Some help with ebikes
Replies: 21
Views: 733

Re: Some help with ebikes

Fyi, that's actually a band brake, not a drum brake. You can also have the brake, and still have regen. The motor will be ok, esp since you have a spare. Just figure out the missing spacer... It will be fine.