Search found 266 matches

by PaulD
Nov 14 2019 2:41pm
Forum: Battery Technology
Topic: Internal Resistance for pack of LG HG2 cells
Replies: 22
Views: 362

Re: Internal Resistance for pack of LG HG2 cells

To be clear, you want to measure the resistance of each 14S1P string? Or each 1S20P group? Not sure how your pack is configured. Basically, you can estimate current using I = V/R. I usually use 2C current for measuring DC resistance. If your current is too low, the voltage drop is too low and your a...
by PaulD
Nov 05 2019 5:54pm
Forum: E-Bike Build Threads / Photos & Video
Topic: leaning trike cargo bike front end kit
Replies: 113
Views: 10593

Re: leaning trike cargo bike front end kit

Looks like a lot of fun. I agree that increasing the maximum lean angle is a good idea. I think a cornering video that's not from the riders perspective would be cool to see.
by PaulD
Nov 05 2019 5:22pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 90
Views: 12419

Re: PaulD's lightweight mid drive development

jvm37 wrote:
Nov 05 2019 5:04pm
Paul I have sent you a couple of emails
I am interested in buying one of your kits
Please take a look
I just checked my spam, and I'm not seeing your messages. Which email address did you send them to? Maybe the web contact form is broken. I'll test it out.
by PaulD
Nov 02 2019 10:26pm
Forum: E-Bike Build Threads / Photos & Video
Topic: leaning trike cargo bike front end kit
Replies: 113
Views: 10593

Re: leaning trike cargo bike front end kit

This is great, stellar work!
How much front suspension travel? Have you searched patents to see if there is any risk in violation if you bring it to market?
by PaulD
Nov 02 2019 2:14pm
Forum: E-Bike Technical
Topic: Programming ASI Bac 8000
Replies: 6
Views: 372

Re: Programming ASI Bac 8000

For the benefit of the community, I'll summarize our email discussion, firstly, here were the suggestions on battery protection parameters. ASIerrors.png Then you had instantaneous undervoltage errors due to incorrect SOC algorithm parameters, since you are using the ASI battery protection scheme. N...
by PaulD
Oct 31 2019 1:03pm
Forum: Battery Technology
Topic: Shipping batteries, or cheap alternative for benchtop testing?
Replies: 14
Views: 407

Re: Shipping batteries, or cheap alternative for benchtop testing?

1. Look into Ligo bricks from Grin. Ligo bricks are 36V. He needs 48V. 2. SFAIK, batteries installed in a sealed, rigid enclosure are somewhat easier to comply with shipping regulations. 3. My battery was in such an enclosure, enclosed in a bag, then placed in a box full of what appears to be Vermi...
by PaulD
Oct 30 2019 10:37pm
Forum: Battery Technology
Topic: Shipping batteries, or cheap alternative for benchtop testing?
Replies: 14
Views: 407

Re: Shipping batteries, or cheap alternative for benchtop testing?

Just a few updates: -Luna Cycle was not willing to provide me with a UN safety certificate, so I wouldn't really be able to re-ship one of their packs. -An unnamed vendor was willing to provide the UN safety certificate, but for a much smaller battery than what I was asking for. They said that when...
by PaulD
Oct 28 2019 4:24pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 950
Views: 108309

Re: kWeld - "Next level" DIY battery spot welder

I have another idea: Why bother welding at all? I already mentioned using some reflow solder paste between the nickel or copper and the cell. As the weld is made, it creates a lot of localized heat. Enough heat to melt solder and short enough duration to NOT heat up the cell. This may be a great wa...
by PaulD
Oct 24 2019 10:06pm
Forum: Battery Technology
Topic: Wire Bonding machines
Replies: 6
Views: 390

Re: Wire Bonding machines

I have contacted Hesse Mechatronics and hoping to get a decent price soon, but there are a few cheaper Alibaba types such as Minder Hi-Tech. I think they started at $60k. Cool, I wonder if Minder is any good. I was hoping they would be significantly cheaper than US and EU machines. Let us know what...
by PaulD
Oct 22 2019 11:34am
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 36
Views: 937

Re: Testing the internal resistance of a li ion cell and making determinations

If we knew the specific heat capacity and DC IR of the above 18650 cell we could work out the total cell heating and compare it to that predicted by simple ohmic heating - approximately - on account of heat loss due to imperfect insulation, heating of box interior etc. It's been a while but I recal...
by PaulD
Oct 21 2019 4:14pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 440
Views: 49083

Re: GNG / CYC X1 Pro 3000w

Has anyone been charged any tariff in these product categories yet, at all? The tariffs only apply to shipments over $2K (or is it $2500?). And it seems to apply to country of origin(manufacture), not where it is shipped from. Is CYC manufactured in HK or mainland China? I had to pay tariffs on a l...
by PaulD
Oct 21 2019 12:27pm
Forum: Battery Technology
Topic: Wire Bonding machines
Replies: 6
Views: 390

Re: Wire Bonding machines

I recall them starting around $70-80K USD. That size you are looking for would be more $$. This was at 5 years ago.
In my past job, we looked at Hesse, F&K and K&S.. then decided not to use cylindrical cells :roll:
What does your company build?
by PaulD
Oct 17 2019 12:16pm
Forum: E-Bike General Discussion
Topic: Thoughts on cargo bikes
Replies: 40
Views: 1437

Re: Thoughts on cargo bikes

Wish they'd make an open (non-Bosch) version. Big hills + heavy loads need lots more oomph The Sweet Curry makes for a great conversion. Lot's of room for battery. I can cruise at 22-25 mph with 450W, but less when fully loaded up. A bigger mid-drive should do it. The small rear wheel leads me to u...
by PaulD
Oct 15 2019 12:08pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 950
Views: 108309

Re: New welding metal

It's nickel, stainless steel and copper. I asked if he could send me a sample of it so he sent me 12" of it. He has no supply yet so this with a lot of his very limited stock. As expected the .3mm nickel has the lowest resistance. But check out that .1mm thick alloy! Not much more resistance despit...
by PaulD
Oct 14 2019 1:52pm
Forum: E-Bike Technical
Topic: Programming ASI Bac 8000
Replies: 6
Views: 372

Re: Programming ASI Bac 8000

john61ct wrote:
Oct 14 2019 8:08am
I also would like to find a freelance professional willing to tune these controllers to a given motor.
I've been considering this for a while. I've spent a lot of time tuning for a few different motors. Feel free to shoot me a PM.
by PaulD
Oct 06 2019 3:07pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1411
Views: 190533

Re: Dave's 80:1 RC mid drive kit build log

Ecyclist wrote:
Oct 06 2019 10:37am
I built a drive for myself. In two days I will by flying with my set-up to Japan.
How are you going to get that bike on the airplane?
by PaulD
Oct 05 2019 12:41pm
Forum: E-Bike Technical
Topic: ASI Bac2000 tuning
Replies: 1
Views: 126

Re: ASI Bac2000 tunning

If you share your XML parameter file, some people might be able to have a look at it and help you.
by PaulD
Oct 03 2019 6:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 90
Views: 12419

Re: PaulD's lightweight mid drive development

The problem with adjusting the gearing by 1.4X is that the top speed of the motor would be too high. Do you mean with respect to heating and wearing down of internal pieces? Makes sense. 40% is significant. So there is no safe workaround to internal rewiring. Efficiency, heating and wear, and risk ...
by PaulD
Oct 02 2019 11:25pm
Forum: E-Bike Technical
Topic: Sprag clutch vs freewheel
Replies: 12
Views: 566

Re: Sprag clutch vs freewheel

Ok, I finally had time to get some pictures of my sprag experiment. I think the outer ring might not be stiff enough, but testing will prove that out. One might think it's an advantage to have a larger diameter, but it requires more material to achieve sufficient stiffness. This is about 200g heavie...
by PaulD
Oct 01 2019 1:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dengfu M09 Endruo/Freeride build log
Replies: 102
Views: 5629

Re: Dengfu M09 Endruo/Freeride build log

Instead it has a single magnet on the end of the motor pinion gear which is located behind the shinny circular post just behind the 3 phase plug. This means you will need to take care refitting the speed controller cover as I presume there is a sensor on the speed controller circuit board that pick...
by PaulD
Sep 25 2019 3:39pm
Forum: E-Bike Non-hub Motor Drives
Topic: Luna Cycle X-1 Enduro FS (Bafang M600 / Dengfu M09)
Replies: 155
Views: 6702

Re: Luna Cycle X-1 Enduro FS (Bafang M600 / Dengfu M09)

I emailed Luna about the weight on the product page. They said when they weighed their bike in the shop it was 49lbs. I asked if they could put it on the scale again to verify. They responded back the medium is 55lbs and there's no way to make it lighter, lol. My gut tells me the shop was too busy ...
by PaulD
Sep 23 2019 8:45am
Forum: Battery Technology
Topic: Is my Valence LiFePO4 DOA?
Replies: 7
Views: 273

Re: Is my Valence LiFePO4 DOA?

There was no status light then or now. In my experience, no status light means either a cell or two below minimum voltage or a bad BMS board. Did you measure a voltage on the terminals? Return shipping will be an issue since a battery that size needs to ship fully regulated dangerous goods. They sh...
by PaulD
Sep 13 2019 10:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 90
Views: 12419

Re: PaulD's lightweight mid drive development

I understand 52V would work with your motor, by reprogramming the controller, but with sub-optimal efficiency. Am I correct to assume that the motor would then spin 14/10 times faster unloaded? What kind of efficiency loss are we talking about, at constant speed and load? (assuming it is easy to ad...
by PaulD
Sep 10 2019 12:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 440
Views: 49083

Re: GNG / CYC X1 Pro 3000w

CYC has informed me that the black 72v torque sense version will be shipped soon, the version I'm getting. I can't wait to post progress pics of my build for you guys, I have a cycle analyst 3 installed so I'll be tuning optimal settings for that to make up for the weaknesses in the beta app. Here ...
by PaulD
Sep 02 2019 10:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 90
Views: 12419

Re: PaulD's lightweight mid drive development

I chose the middle ground for optimum cadence. Early prototypes favored lower pedal speeds, but some beta testers wanted more power at 70-80 RPM, so I decreased the final gear ratio a bit. Savvy users can adjust the gear ratio by changing out the sprockets. The #25 front final drive sprocket is a st...