Search found 1661 matches

by john61ct
Oct 17 2019 8:53am
Forum: E-Bike Reviews & Testing
Topic: Cycle Analyst V3 preview and first beta release
Replies: 4493
Views: 709001

Re: Cycle Analyst V3 preview and first beta release

rowbiker wrote:The short answer is "yes".

The long answer is that all the details you need to implement the above short answer are in this ES thread and the CAv3 manual, fully available online (link also in this thread). Happy reading!
Wow, that kind of response would I think be really off-putting to prospects.
by john61ct
Oct 17 2019 8:52am
Forum: E-Bike Reviews & Testing
Topic: Cycle Analyst V3 preview and first beta release
Replies: 4493
Views: 709001

Re: Cycle Analyst V3 preview and first beta release

Is there any important functionality in the CAv3 that is not already available with the Nucular controllers' software?
by john61ct
Oct 17 2019 8:31am
Forum: E-Bike Technical
Topic: EM3EV's battery with smart BMS
Replies: 1
Views: 70

Re: EM3EV's battery with smart BMS

Depends on the BMS model used, should be adjustable and able to observe / verify from your phone or PC

by john61ct
Oct 17 2019 8:30am
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 13
Views: 205

Re: Charger like LiPro 6S

Redneck kludge solution's not indicated here.

Have not seen one good review, lots of threads citing problems.

Good for a troubleshooting / rebuilding project once students are more expert on electronics maybe
by john61ct
Oct 17 2019 2:58am
Forum: Battery Technology
Topic: Increasing range with parallel li ion batteries
Replies: 40
Views: 744

Re: Increasing range with parallel li ion batteries

Depends on the C-rate, and how long
by john61ct
Oct 17 2019 2:55am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 789
Views: 66506

Re: Nucular electronics - complete kit for ev! [beta]

48-60V is the upper end of "kinda safe" if big currents are involved.

Amazingly small power can be fatal in less common scenarios
by john61ct
Oct 17 2019 2:54am
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 13
Views: 205

Re: Charger like LiPro 6S

Set it as a research project for the students, focus on Singapore, China / HK & Taiwan ask for contributions by local businesses and maybe better off parents, leave room for non-dangerous mistakes.

You'll find students that can take the lead, soon be teaching you
by john61ct
Oct 17 2019 2:48am
Forum: Battery Technology
Topic: Single Li-ion cells with capacity 36Ah from KOK POWER?
Replies: 2
Views: 62

Re: Single Li-ion cells with capacity 36Ah from KOK POWER?

Get the dimensions, will be pretty big for a bike
by john61ct
Oct 16 2019 10:24pm
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 41
Views: 861

Re: Why not comfort bikes?

wow sounds great, tx
by john61ct
Oct 16 2019 9:01pm
Forum: General Discussion
Topic: Diy build. Questions questions, so many questions
Replies: 4
Views: 80

Re: Diy build. Questions questions, so many questions

I would start with a known good battery pack, you have too many other unknown variables there. Yes that alone may cost more than the rest of your drivetrain, but if you treat it right might last for years, depending on duty cycle of course. With scrapped cells you might only get a month or two then ...
by john61ct
Oct 16 2019 7:24pm
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 13
Views: 205

Re: Charger like LiPro 6S

The Satiator is excellent, but adjustable, usually a good thing. It does not balance, obviously nothing but RC Hobby chargers do. I would have thought the whole point was teaching everyone the details of this technology there really is no way to make it safe if just "any visitor" is allowed to handl...
by john61ct
Oct 16 2019 7:18pm
Forum: Battery Technology
Topic: Changing the voltage on the 13S charger from 54.2V to 54.6V
Replies: 5
Views: 148

Re: Changing the voltage on the 13S charger from 54.2V to 54.6V

I would agree it is important to get a known-good fresh battery to work with.

But would think best to calibrate with the (also known good, accurate) voltmeter

measuring that the CV voltage is what you actually want **at the battery**

rather than unloaded OCV from the disconnected charger leads.
by john61ct
Oct 16 2019 6:50pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 873
Views: 101043

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

Aha sorry I misunderstood
by john61ct
Oct 16 2019 4:24pm
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 13
Views: 205

Re: Charger like LiPro 6S - Getting closer

Some heavy duty googling through this forums links turns up an 8S balance charger Getting closer. 10S are common, 12S exist but very limited choices. > It is not practical or "safe" to split the pack routinely for inspection. Absolute bulldust. Build with whatever connectors you like, put per-pack ...
by john61ct
Oct 16 2019 4:05pm
Forum: E-Bike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 154
Views: 21303

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

I'll post it to its own thread once I install it into a clear case and take some pictures. Its pretty simple. Also, for those who are concerned about cutting off the throttle unexpectedly, many of these boards have an alarm buzzer. When the temp gets above 120 or so, you can set it up to sound the ...
by john61ct
Oct 16 2019 3:56pm
Forum: Items for Sale - New
Topic: qs 3kw 70H mid drive
Replies: 4
Views: 200

Re: qs 3kw 70H mid drive

Do you know a professional willing and able to tune it for your setup?
by john61ct
Oct 16 2019 3:43pm
Forum: Battery Technology
Topic: Changing the voltage on the 13S charger from 54.2V to 54.6V
Replies: 5
Views: 148

Re: Changing the voltage on the 13S charger from 54.2V to 54.6V

Or rather, ensure that your setpoint is higher than your BMS start-balance voltage.

Or stop doing your balancing using the BMS, get a better designed device
by john61ct
Oct 16 2019 3:31pm
Forum: E-Bike General Discussion
Topic: High power ebike means none of the rules apply to me
Replies: 29
Views: 928

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

Sorry, head out to sparsely traveled country roads for your testing.

Extreme sports taking such risks have no place on roads that densely traveled.

I welcome more stringent enforcement.
by john61ct
Oct 16 2019 3:26pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 873
Views: 101043

Re: New welding metal


ossivirt wrote:If you feel like you need to. 2000 amps is the max allowed
Who regulates, in what jurisdiction?

by john61ct
Oct 16 2019 3:24pm
Forum: E-Bike General Discussion
Topic: Why not comfort bikes?
Replies: 41
Views: 861

Re: Why not comfort bikes?

https://yubabikes.com/ Are these Dutch designs available in the States? Especially need heavy weight bearing? Would also like to look at cargo / delivery type. Those are all longtail cargo bikes, we don't have that stuff here in the netherlands. If you want to buy a real dutch brand, Gazelle, Batav...
by john61ct
Oct 16 2019 2:43pm
Forum: E-Bike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 154
Views: 21303

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

Interesting idea, would like to see this discussed in greater depth. Worth its own dedicated thread though I just built a little throttle cutoff harness for over-volted/watted motors that uses a mini 5v thermostat board, that cuts off the throttle when the motor internals hit 120 degrees Celsius. LM...
by john61ct
Oct 16 2019 8:23am
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 13
Views: 205

Re: Charger like LiPro 6S

Have fireproof charging boxes, learn judging EoL, get good insurance.

Or go to LiFePO4

Lead to save a lot of money, help them get some exercise
by john61ct
Oct 16 2019 7:13am
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 75
Views: 1665

Re: Samsung 40T and other cells like it?

I think the best rule of thumb for general applicability is to ignore the fictional advertised C-rate completely.

Rely on objective standardised testing only, if high C-rate is important to your use case.
by john61ct
Oct 16 2019 6:51am
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 13
Views: 205

Re: Charger like LiPro 6S

^^ this

Modular packs, various Ah capacities and voltages.

Teach them serial vs parallel
by john61ct
Oct 16 2019 6:48am
Forum: Battery Technology
Topic: Changing the voltage on the 13S charger from 54.2V to 54.6V
Replies: 5
Views: 148

Re: Changing the voltage on the 13S charger from 54.2V to 54.6V

Get a BMS that lets you lower start-balance to 4.05Vpc

Only go higher than 4.1Vpc for occasional maintenancee, cap benchmarking etc.

Dunno from that charger but I'd just try and see using a good DMM at the battery end.