Search found 846 matches

by dustNbone
Oct 11 2019 3:18am
Forum: Battery Technology
Topic: 54.6V charger on a 58.4V lifepo4 pack
Replies: 8
Views: 185

Re: 54.6V charger on a 58.4V lifepo4 pack

As long as you can verify that it's indeed a 16S LiFePo4 pack, then yes the 58.4V charger is the correct one.
by dustNbone
Oct 10 2019 8:44pm
Forum: E-Bike General Discussion
Topic: What could be the cause of a tripping bms
Replies: 17
Views: 232

Re: What could be the cause of a tripping bms

You're going to need to get rid of those bad cells somehow. Depending how the packs put together, and since the remaining cell groups are relatively unused it's probably worth replacing them. I'd do all 3 groups that went low just to be sure you're going to have a reliable pack that stays reasonably...
by dustNbone
Oct 10 2019 7:01pm
Forum: E-Bike General Discussion
Topic: What could be the cause of a tripping bms
Replies: 17
Views: 232

Re: What could be the cause of a tripping bms

Well, it could mean that as well but in this context it means that it can't deliver it's rated current anymore, because there's too much resistance through the cell. It's a sign of physical damage to the internal components of the cell. Resistance also means heat, so attempting to pull high current ...
by dustNbone
Oct 10 2019 6:54pm
Forum: E-Bike General Discussion
Topic: What could be the cause of a tripping bms
Replies: 17
Views: 232

Re: What could be the cause of a tripping bms

It's also possible that one of the cell groups that went dead is actually toast. It might be able to hold full voltage when you charge it but it sags below LVC under load due to high internal resistance.
by dustNbone
Oct 10 2019 6:53pm
Forum: E-Bike General Discussion
Topic: What could be the cause of a tripping bms
Replies: 17
Views: 232

Re: What could be the cause of a tripping bms

Sounds like the BMS is hitting it's current limit, or at least what it thinks is it's current limit. What's it supposed to be rated for? It's possible that it has multiple current sensing shunts and one (or more) of them has a bad connection to the PCB, which would cause the overcurrent to be trippe...
by dustNbone
Oct 10 2019 2:55pm
Forum: Battery Technology
Topic: 13s charger for low SOC charging
Replies: 29
Views: 442

Re: 13s charger for low SOC charging

Luna sells their "advanced" chargers with a 3 position selector for 80, 90 and 100% charge points. https://lunacycle.com/luna-charger-48v-advanced-300w-ebike-charger/ There are probably other sellers of a similar (or identical minus the logo) charger but that's the one that came to mind. Many of the...
by dustNbone
Oct 10 2019 1:16pm
Forum: E-Bike Technical
Topic: Blown 2 KT controllers in a row
Replies: 27
Views: 471

Re: Blown 2 KT controllers in a row

Yeah I'd also be looking for intermittent phase shorts, either in the wiring harness or possibly inside the motor.

Either that or you have very bad luck with controllers.

But good luck with AliExpress refunds.
by dustNbone
Oct 10 2019 1:06pm
Forum: Battery Technology
Topic: 36v DC to 240v AC(uk)
Replies: 8
Views: 188

Re: 36v DC to 240v AC(uk)

Whatever inverter you end up with, you'll probably need to install your own XT-60 connector on it. Not likely to get a truly plug and play solution here.
by dustNbone
Oct 09 2019 10:46pm
Forum: Motor Technology
Topic: is this post correct?
Replies: 5
Views: 166

Re: is this post correct?

Just incorrect data. If you want that motor to actually make it's rated 22HP, you'd need to give it enough work to require that 22HP. If it's not loaded enough, and can just spin up to operating speed, the current will taper off to only what is required to maintain that speed. A forklift motor will ...
by dustNbone
Oct 09 2019 5:49pm
Forum: E-Bike Technical
Topic: Source for bidirectional DC power meter?
Replies: 5
Views: 130

Re: Source for bidirectional DC power meter?

I used one of these and a little DPDT switch to reverse the shunt sense wires. Not automatic but as long as I remember to flip the switch it does the job.

https://www.ebay.ca/itm/Voltage-Current ... 3145508572
by dustNbone
Oct 09 2019 5:43pm
Forum: E-Bike General Discussion
Topic: Dozens of Bicycles Recovered!
Replies: 18
Views: 492

Re: Dozens of Bicycles Recovered!

Canmore has a courthouse?
by dustNbone
Oct 09 2019 4:33pm
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 17
Views: 383

Re: DIY Motor Dyno/load?

It's pretty easy to size an alternator as a load. A 10Kw one will be able to convert 10Kw of mechanical energy to electrical energy, it's literally what they're made to do. If you can't get it to do that, you either need to turn it faster or put a more appropriate electrical load. An ebike controlle...
by dustNbone
Oct 08 2019 8:47pm
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 17
Views: 383

Re: DIY Motor Dyno/load?

Whatever you do is going to turn mechanical energy into heat at some point, you need to consider where that heat goes. The way you're suggesting seems like all the heat is going to need to be rejected through the windings of the alternator/motor, and I don't see that working well for long. Moving mo...
by dustNbone
Oct 08 2019 6:52pm
Forum: Motor Technology
Topic: DIY Motor Dyno/load?
Replies: 17
Views: 383

Re: DIY Motor Dyno/load?

resistors in buckets This is probably the easiest, cheapest and least messy method available to the average person. As long as the water is kept below boiling point you can do this all day, with a pretty decent level of accuracy. You can even just buy bulk nichrome wire and cut it to length to get ...
by dustNbone
Oct 08 2019 6:12pm
Forum: E-Bike Technical
Topic: Portable 5-8 amp charger
Replies: 27
Views: 628

Re: Portable 5-8 amp charger

Yes many people here have stacked HLGs in series and parallel to charge batteries. They're fully isolated afaik.
by dustNbone
Oct 06 2019 7:52pm
Forum: General Discussion
Topic: Bicycle Speakers
Replies: 16
Views: 295

Re: Bicycle Speakers

Exactly, which is why you need to rely on your eyes. We're not good enough as humans at directionalizing sounds to depend on that as a defense mechanism. You need to be looking all around you, all the time. Mirrors just allow you to cover the area behind you without requiring you to look over your s...
by dustNbone
Oct 06 2019 7:37pm
Forum: E-Bike General Discussion
Topic: High power ebike means none of the rules apply to me
Replies: 40
Views: 1268

Re: High power ebike means none of the rules apply to me

Yeah I don't see anything especially dangerous to the public at large there. He's even using a deadman strap!
by dustNbone
Oct 06 2019 4:27pm
Forum: General Discussion
Topic: Bicycle Speakers
Replies: 16
Views: 295

Re: Bicycle Speakers

Get some mirrors, and a decent set of headphones.

You shouldn't be depending on hearing things coming toward you to save your ass from getting hit, or you will eventually be run over by an electric car with high efficiency tires.

It's like that old "loud pipes save lives" bullshit. They don't.
by dustNbone
Oct 02 2019 5:51pm
Forum: General Discussion
Topic: Epic fail- tried to pull out a tree stump, dug it out in 45 min- pulse 144
Replies: 30
Views: 860

Re: Epic fail- tried to pull out a tree stump, dug it out in 45 min- pulse 144

Lol just don't die. If you die the tree wins.

Well. I guess it would be a tie at that point.
by dustNbone
Oct 02 2019 5:32pm
Forum: General Discussion
Topic: How to charge this battery?
Replies: 17
Views: 377

Re: How to charge this battery?

It can detect the direction of current flow, it can shut off the battery from discharge and then when it detects voltage at the port it will reconnect the port to the battery for charging.

Fairly common design, replaces a few big expensive parts with some brains.

SIgn of the times man....
by dustNbone
Oct 01 2019 7:13pm
Forum: Battery Technology
Topic: Connecting ebike charger correct way round
Replies: 2
Views: 150

Re: Connecting ebike charger correct way round

You can't assume anything based on wire colors, especially when it comes from China. Check with your multimeter, then check again. Connecting reverse polarity could have results ranging from: The charger simply not working because it's smart enough to know what you did Blowing a fuse on the charger,...
by dustNbone
Oct 01 2019 6:09pm
Forum: E-Bike General Discussion
Topic: Front suspension or steel frame
Replies: 16
Views: 506

Re: Front suspension or steel frame

I wouldn't be afraid to try no suspension, if the roads you're riding on are half decent. I've been commuting 30+km a day on a 1974 Nishiki touring bike with no suspension (but a bendy road fork) and 38mm tires, for several years now. I've hit a couple potholes that concerned me, one that destroyed ...
by dustNbone
Oct 01 2019 5:47pm
Forum: Motor Technology
Topic: How to limit current of controller?
Replies: 14
Views: 360

Re: How to limit current of controller?

The shunt will run at about the same temperature it does now, because as you increase it's resistance the controller lowers the amount of current running through it accordingly.
by dustNbone
Oct 01 2019 7:00am
Forum: General Discussion
Topic: How to charge this battery?
Replies: 17
Views: 377

Re: How to charge this battery?

Those 3 wires could be for a few things: -A remote power switch connection to the BMS, possibly with an extra wire for an LED voltage indicator. You might need to connect two of them together to "turn on" the battery. -Output from a USB power converter inside the battery, to be connected to an exter...
by dustNbone
Sep 30 2019 7:53pm
Forum: E-Vehicles General Discussion
Topic: What are some good 3000 Watt hub motors for 26inch rims?
Replies: 4
Views: 344

Re: What are some good 3000 Watt hub motors for 26inch rims?

The Cyclone (4th one you listed) is not a hub motor. I think OP was looking for recommendations not the results of a Google search.