Endless Sphere

Ianhill wrote:Grins new thru axle hub is a real nice design

This what you mean?
https://www.ebikes.ca/product-info/all- ... motor.html

TDB wrote:Do you have shares in Opticool?

He's not claiming it would work, just cheerleading for people to try testing it

tblakeng wrote:Does it need to be that brand? Why not just any 48v lion plug it right in

And although LFP at 3.2V nominal, is in the LI family of chemistries, li-ion usually means those specifically rated 3.6-3.7V

Just LFP's lower voltage brings 6S down quite a bit.

4S will be 12-13.3V

On behalf of the community and my future self,

Thank You!

Yes I meant finished packs, normal IRL usage

charged to 4.05-4.10Vpc

LVC set at 3.4-3.6V not 2.8Vpc

discharged at maybe hundreds of amps peak, not CC at the 10-20 hour rate

Very sensible approach not trusting cheap BMS for high currents. I do not even use them for charge control nor balancing, RC Hobby chargers are faster and more reliable. As a failsafe backup HVC maybe. Dual port means one for charge control HVC, separate path for discharge LVC, while single port one...

if i need to leave a battery charging for days to try and top balance it, thats plain moronic in my opinion and probably kills weak battery packs faster than anything else actually i should say, top balancing older packs to 4.2v is plain moronic and only balance at one point, top, bottom or your lv...

Other relevant http://www.cnqsmotor.com/en/article_read/Statorade%20Ferrofluid/680.html http://www.cnqsmotor.com/en/article_read_668.html http://www.cnqsmotor.com/en/article_read/HubSink%20Set/681.html http://www.cnqsmotor.com/en/article_read_853.html http://www.cnqsmotor.com/en/article_read_381.htm...

And, do you have a way to accept support donations?

Wow fantastic! Yes the lower range stop-charge setpoint 3.42V to 3.48V is for "normal daily-use" cycling in production, depends on charging C-rate and cell temperatures. Periodic "maintenance cycling" balancing / cap testing etc will use cell mfg datasheet values, maybe annually ...

markz wrote:I believe there is a solid reason

Yes statorade is his thing. I just meant as to his not investing time into experimenting with other options.

that's a stretch higher pricing does not imply better quality usually just higher demand or tighter supply 99.9% of prospects still see 30Q as a good battery. If the maker thought the problem worth fixing they likely would have done so a ling time ago A more profitable and IMO likely strategy would ...

Even with the best quality cells and a purely honest vendor

a bank accurately rated at say 40Ah

would only deliver say 30-35Ah in real-life conditions aimed at good lifecycle longevity.

OK, I can see that multiple wheels allows for better stopping power. So given a cargo bike, heavy-load out in front rather than to the rear is that the use case? Does the tilting increase the **speed** at which you can safely operate? I can't imagine actually tilting that much of an angle at the 15-...

Pushing for heat shedding modifications to get more power out of a lighter smaller motor may not fit Grin's business model Those customers concerned with utility, focus on transportation, getting a load from A to B, maybe daily commuting are radically different than those out for fun, sporty use cas...

I have read the whole thread, and still don't understand the purpose.

Also, why is the EU different from the US?

Yes, if you have or get a load device that pulls a constant very low C-rate, traditionally over 20hrs If strictly constant amps then just use a timer otherwise put a coulomb counting wattmeter in between, a bit less accurate Draw down from 100% Full to 0% empty as defined by the battery data sheet. ...

A pack-voltage LVC can work but should be adjustable both based on the C-rate (higher amps means lower voltage) and on how well-matched or relatively healthy the cells are. Best used with bottom balancing, and intimate familiarity so intuition kicks in. Otherwise really best for the LVC to be based ...

LFP is much lower density.

A123 makes NMC pouches should deliver same level of energy and power in a lighter smaller form factor.

But much shorter lifespan and much more thermally risky.

Works with LFP voltage values?

Still 21S max?

24s LFP for many is 87V, but for me more like 82V maximum

Actually, one way to do this correctly would be to charge through the motor using a suitable controller. Adaptto and Nucular can do this: " Charge mode through the motor with the controller, plug any DC supply to the controller to charge your battery " Yes if you can figure it out, that's...

I'd expect current limits are deliberately ignored with any charging method. I'm an advocate of safety, but due to the dynamics of equalization (and because it would be supervised) I actually don't see this as being that dangerous. Depends on resistance of the source side chemistry. From Lead to LI...

bingbwy wrote:Motor QS 5000w 12 inch

What model motor?

Wattage does not designate that. QS138, QS205?

Yes better to rig a current-limiting circuit that does not vary so much as voltage / SoC drops. Of course a PSU / charger powerful enough to "just barely almost" keep up with the welder's Ah/minute consumption would allow for a smaller battery, just using it as a short-term buffer, maintai...