Search found 772 matches

by dustNbone
Aug 24 2019 9:58am
Forum: Battery Technology
Topic: clamp meters
Replies: 15
Views: 198

Re: clamp meters

I've never seen one off by more than .02A, so I'm not sure where you get your 5% from. low current versions are probably better, but i only use the 100, 200 or 300A range and those shunts they supply are pretty shit. accuracy of these things is mainly a case of winning the shunt-lottery. Ahhh ok th...
by dustNbone
Aug 24 2019 9:23am
Forum: Battery Technology
Topic: clamp meters
Replies: 15
Views: 198

Re: clamp meters

flippy wrote:
Aug 24 2019 2:04am
Those are off by about 5%.

The small clamp meter i pointed to is less then 1% and does not require you to cut into the wireing system.
I've never seen one off by more than .02A, so I'm not sure where you get your 5% from.
by dustNbone
Aug 23 2019 7:57pm
Forum: Battery Technology
Topic: Does a 12S liPo balance charger exist?
Replies: 14
Views: 295

Re: Does a 12S liPo balance charger exist?

Makes sense if he's using A123 pouches. Unless you're hamming on them (which means 100A+ discharge) they don't go far out of balance. I have a 16S pack that I put 2x6S and a 4S balance leads on, normally bulk charge at 5A and do a balance a few times a year. With a 50W iMax B6 charger doing all 3 "p...
by dustNbone
Aug 23 2019 7:44pm
Forum: Battery Technology
Topic: clamp meters
Replies: 15
Views: 198

Re: clamp meters

I have several of these and they are disturbingly accurate.

Image
by dustNbone
Aug 23 2019 3:28pm
Forum: Battery Technology
Topic: clamp meters
Replies: 15
Views: 198

Re: clamp meters

It just indicates 2 ranges you can use. You'll get more precision on the lower range (an extra decimal place displayed).\

Probably .01A on the lower range and .1A on the higher one.
by dustNbone
Aug 23 2019 2:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBHD 48v 1000w: Controller dead?
Replies: 11
Views: 143

Re: Bafang BBHD 48v 1000w: Controller dead?

Like I said before, you should be able to get a speed reading in Km/h on the display by turning it on and spinning the wheel by hand. If it stays at 0 there's a problem with the sensor/wiring. The LED being unlit indicates it's probably not getting power. There should be 3 wires for the sensor, +5V,...
by dustNbone
Aug 23 2019 8:08am
Forum: E-Bike Technical
Topic: 2x Li-Ion 48v, ground path question
Replies: 4
Views: 148

Re: 2x Li-Ion 48v, ground path question

It will work, at least initially, but the problem I foresee is where you make your connections to the frame.

Electrolysis is going to make a mess of things if you aren't very careful about using compatible metals, it will eat through your frame if it happens.
by dustNbone
Aug 22 2019 10:55pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBHD 48v 1000w: Controller dead?
Replies: 11
Views: 143

Re: Bafang BBHD 48v 1000w: Controller dead?

If it's driving the motor at all the controller is probably fine. Did you verify the speed sensor is functioning? You should be able to get a speed reading on the display by spinning the wheel, even without the motor running. The symptoms you described are literally identical to what will happen if ...
by dustNbone
Aug 22 2019 7:00pm
Forum: E-Bike General Discussion
Topic: Hub motor stopped working. Help!
Replies: 15
Views: 309

Re: Hub motor stopped working. Help!

If you have a multimeter it should be fairly easy to check for winding shorts, and with a bit more effort you can test the hall sensors.

You'll probably have to turn the motor backwards to do the hall test, as the clutch in the motor will prevent the wheel moving forward from turning the motor.
by dustNbone
Aug 22 2019 6:54pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBHD 48v 1000w: Controller dead?
Replies: 11
Views: 143

Re: Bafang BBHD 48v 1000w: Controller dead?

Wheel speed sensor would be my guess. Make sure it's connected and the magnet and pickup are passing each other as the wheel turns. The motor will cut out after a preset time if it doesn't get a signal from that sensor. Normally it will spit out an error code on the display when this happens but I'v...
by dustNbone
Aug 22 2019 4:56am
Forum: E-Bike General Discussion
Topic: Rear hub or Mid-drive (should I just flip a coin?)
Replies: 26
Views: 704

Re: Rear hub or Mid-drive (should I just flip a coin?)

For reference, here's a photo of a ferry entering Departure Bay on Vancouver Island.

You could call those mile high rocks in the background "hills" I suppose.
12444457175_2e2f123bb5.jpg
12444457175_2e2f123bb5.jpg (88.09 KiB) Viewed 95 times
by dustNbone
Aug 21 2019 8:56pm
Forum: Battery Technology
Topic: LifePo4 Vs Lipo 48v packs in electric racing kart setup
Replies: 25
Views: 417

Re: LifePo4 Vs Lipo 48v packs in electric racing kart setup

flat tire wrote:
Aug 21 2019 8:33pm
140kw/kg is worse than high discharge rc lipo and way worse than less high discharge lithium ion. Lifepo4 has advantages in cycle life and safety, THAT'S IT. It is NOT a performance chemistry in any sense.
I dunno, the 400A peak capable under 20lbs. pack on my rack might disagree.
by dustNbone
Aug 21 2019 8:07pm
Forum: General Discussion
Topic: Cups
Replies: 5
Views: 138

Re: Cups

Hmmmm. I don't want to die from too much plastic in my blood. But I also hate washing dishes. Gonna have to think on this one..... As for a drinking vessel though, I drink mostly from a stainless steel starbucks cup, unpainted. My "desk" coffee cup is a 16oz pyrex measuring cup. Not because it's not...
by dustNbone
Aug 21 2019 6:50pm
Forum: Battery Technology
Topic: LifePo4 Vs Lipo 48v packs in electric racing kart setup
Replies: 25
Views: 417

Re: LifePo4 Vs Lipo 48v packs in electric racing kart setup

It really depends on the racing class rules, if there's a minimum weight requirement then energy density might not matter at all.

A123 pouches have excellent power density, especially considering their lifespan.
by dustNbone
Aug 21 2019 1:55pm
Forum: E-Bike General Discussion
Topic: Rear hub or Mid-drive (should I just flip a coin?)
Replies: 26
Views: 704

Re: Rear hub or Mid-drive (should I just flip a coin?)

Also consider the ability to hide a rear hub motor under the rear pannier bags hanging off the rear rack. There is no hiding a mid drive motor. True you can't hide it, but the vast majority of people need to have the presence of my BBS02 pointed out to them. If you live on the Island, you want a mi...
by dustNbone
Aug 21 2019 1:45pm
Forum: Battery Technology
Topic: BMS restricts current way too much
Replies: 17
Views: 277

Re: BMS restricts current way too much

500mA is baseline USB charging current, so that just indicates the phone isn't negotiating a higher rate. That could be a limitation of the USB board (converter) or the USB cable, but it's probably not because the input current to it is being limited. The only way for it to limit the current would b...
by dustNbone
Aug 21 2019 1:33pm
Forum: Battery Technology
Topic: LifePo4 Vs Lipo 48v packs in electric racing kart setup
Replies: 25
Views: 417

Re: LifePo4 Vs Lipo 48v packs in electric racing kart setup

All else being equal, LiFePo4 operates over a narrower voltage range than LiPo, so you'll have a wider gap in top speed between full and dead. My 16S LiFePo4 pack ranges from 58.4V to 48V, but spends most of the discharge between 56 and 50. My 14S Li Ion pack goes from 58.8V to 42V, and goes down in...
by dustNbone
Aug 21 2019 6:01am
Forum: E-Bike Technical
Topic: BBSHD hall sensor plug/connector, what is that plug called?
Replies: 1
Views: 70

Re: BBSHD hall sensor plug/connector, what is that plug called?

I'm pretty sure it's just a 5 pin JST connector, it was a while ago when I swapped my controller. I just spliced the old plug on to my wiring harness, it was a bit of a pain getting all the silicone out of the socket but it's been fine for a few years now.
by dustNbone
Aug 20 2019 5:36pm
Forum: E-Bike Technical
Topic: Phaserunner TTL to USB converter : RS232 to TRS
Replies: 7
Views: 256

Re: Phaserunner TTL to USB converter : RS232 to TRS

For future reference, serial connections need to have the TX and RX pins crossed over.

So RX on one end to TX on the other end, and vice versa.
by dustNbone
Aug 17 2019 4:53pm
Forum: E-Bike Technical
Topic: Regenerative braking + fully charged battery
Replies: 12
Views: 310

Re: Regenerative braking + fully charged battery

Couldn't you just use a dummy load that engages across the battery when the voltage reaches a certain threshold and releases when it drops? Basically a big ass bleed resistor circuit. You'd need so pretty hefty switching gear but it's totally doable. You could even have multiple loads that engage se...
by dustNbone
Aug 17 2019 12:47am
Forum: Battery Technology
Topic: bogus power supply?
Replies: 21
Views: 409

Re: bogus power supply?

Not necessarily, I'm just assuming that it's an adjustable "bench" type power supply, normally used for electronics work. The kind with a digital readout and "Current" and "Voltage" knobs. You mentioned it being 0-60V, that's why I made that assumption. These are generally not going to like running ...
by dustNbone
Aug 16 2019 10:59pm
Forum: E-Bike General Discussion
Topic: Is this used cargo ebike worth the price?
Replies: 10
Views: 308

Re: Is this used cargo ebike worth the price?

Battery life has little to do with calendar age and more about the life it's had.

If it's been stored at a proper voltage (not full, not empty), hasn't been subjected to high heat, and wasn't abused electrically, it really comes down to how many charge cycles it's had.
by dustNbone
Aug 16 2019 10:55pm
Forum: Battery Technology
Topic: bogus power supply?
Replies: 21
Views: 409

Re: bogus power supply?

If you're intending to charge batteries with it, I'd recommend staying a decent margin below it's maximum power rating, but I don't think that's what a 0-60V supply is intended for.
by dustNbone
Aug 16 2019 7:54pm
Forum: Battery Technology
Topic: UK Source for reliable high amperage breakers?
Replies: 15
Views: 363

Re: UK Source for reliable high amperage breakers?

If they're DC rated they should have a mechanism to extinguish the arc. That (along with simply scale of supply) is why DC breakers cost more than AC ones, they are more complex. AC interruption ratings depend on crossing the 0V point in the AC waveform, simply separating the contacts enough limits ...
by dustNbone
Aug 16 2019 6:25pm
Forum: E-Vehicles General Discussion
Topic: The future of the global shipping industry is . . . bikes
Replies: 3
Views: 178

Re: The future of the global shipping industry is . . . bikes

So. I'm supposed to share bike lanes, etc with commercial delivery vehicles in dense city cores? No thanks. You'll find vehicles of similar size and role in many Asian and African cities, usually pedal powered, occasionally ICE, but there they have an established place in the traffic flow, not among...