Search found 6181 matches

by john61ct
Aug 01 2021 8:16am
Forum: Motor Technology
Topic: Vector controlled motor and controller
Replies: 2
Views: 60

Re: Vector controlled motor and controller

FOC aka flux-vector control, generates sinusoid waveforms, produces consistent torque control, protect MOSFETs, yields better motor efficiency, especially at high speeds. true FOC definition https://www.motioncontroltips.com/faq-whats-the-difference-between-field-oriented-control-and-sinusoidal-comm...
by john61ct
Aug 01 2021 12:47am
Forum: EBike General Discussion
Topic: New charger but..
Replies: 14
Views: 174

Re: New charger but..

Yes routine charging usage profile may need to be different from various routine / scheduled maintenance / monitoring / testing procedures like cap testing and balancing.

But best to not use non-adjustable balancing gear that requires a departure from your desired charge routines
by john61ct
Aug 01 2021 12:42am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 650
Views: 88875

Re: QS 3000w midmotor

PITMIX wrote:Qs already solved the problem look at the sprocket for the Qs 138 90H here.
https://a.aliexpress.com/_vo6uyV
So means buy the belt drive version of the motor, use the adapter to accommodate a chain drive?
by john61ct
Aug 01 2021 12:23am
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1713
Views: 531070

Re: Homemade Battery Packs

Seen too many spark showers and melted plastic surrounds, not just going over 10A but even at low power,

the design of the ciggie port is an inherently unreliable connection.
by john61ct
Aug 01 2021 12:20am
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 121
Views: 21620

Re: Using EV Chargers


Monte wrote:Here's my full day test ride. 18 hours and six < 20 min charging stops. 450km!
CHAdeMO full day test.PNG
Are you accepting applications for sponsoring refugees from the US? My kids are on the verge of becoming responsible productive citizens. . .

by john61ct
Aug 01 2021 12:12am
Forum: EBike Technical
Topic: Are Anderson PowerPole connectors the de-facto standard?
Replies: 13
Views: 234

Re: Are Anderson PowerPole connectors the de-facto standard?

You set your own standards and there will be use cases that justify exceptions. For high current (above 5A) DC IMO yes, PPs are the way to go, long term reliability when crimped properly - no soldering! But they are bulky compared to the "hobby standards" like XTs, and some people prefer /...
by john61ct
Aug 01 2021 12:09am
Forum: EBike General Discussion
Topic: New charger but..
Replies: 14
Views: 174

Re: New charger but..

81 - 83V termination is good for longevity, lower end better, really not sacrificing any significant capacity
by john61ct
Jul 31 2021 7:53am
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 121
Views: 21620

Re: Using EV Chargers

In jurisdictions where charging stations are considered a public utility and regulated in the public interest they may well allow them to be used for DIY bikes But in the US where torts liability is often the biggest factor in any business model, the regulatory bodies are captured by corporate inter...
by john61ct
Jul 31 2021 7:15am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1379
Views: 213894

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

Battery packs based on the 3.6-3.7V chemistries are always going to be a consumable for regular commuting use likely 3 years is optimistic for even the best build quality based on brand new cells. Whereas your infrastructure gear should last much longer, delivering that quality and value over and ov...
by john61ct
Jul 31 2021 6:35am
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1713
Views: 531070

Re: Homemade Battery Packs

4S LFP is ideally stop-charged at 13.8V for longevity. No point at all in going higher, the spec sheet 14.4V is only stressful maximum rating. No need for charge sources labeled "LFP compatible" all you need is user-custom adjustability or a 13.8V setpoint, usually GEL setting works. Or ju...
by john61ct
Jul 31 2021 6:16am
Forum: EBike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 391
Views: 89738

Re: Sabvoton SVMC072150 controller review, variable regen *PICS*

huge difference in capacity utilisation.

4.09Vpc termination is fine probably 85-90%

but 3.82V ??
by john61ct
Jul 31 2021 6:10am
Forum: Technical Reference Area
Topic: Using EV Chargers
Replies: 121
Views: 21620

Re: Using EV Chargers

CHAdeMO is on the losing side of the standards war, even in the US.

And I don't know of any networks that allow bikes or even DIY car rigs to connect
by john61ct
Jul 30 2021 9:57am
Forum: Battery Technology
Topic: Fuse-wire for individual cells, DIY Tesla style
Replies: 194
Views: 48783

Re: Fuse-wire for individual cells, DIY Tesla style

Aha, now I see what you mean, thanks
by john61ct
Jul 30 2021 9:46am
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 650
Views: 88875

Re: QS 3000w midmotor

larsb wrote:I’ve run it at 80V 300A dc input, jbjork about the same.

The geared version won’t be different. (Off course depending on total gearing)
So that J Bjork chart above

only holds for a particular voltage?

Do you know what voltage?
by john61ct
Jul 29 2021 8:21pm
Forum: Battery Technology
Topic: Fuse-wire for individual cells, DIY Tesla style
Replies: 194
Views: 48783

Re: Fuse-wire for individual cells, DIY Tesla style

I though the fusible wire got soldered onto the positive end?

I was looking at just a magnet for the negatives
by john61ct
Jul 29 2021 5:54pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 650
Views: 88875

Re: QS 3000w midmotor


larsb wrote:
QS 138 70H noload losses.JPG
.
So a member claimed they ran this motor up to 20kW ??

How would the geared version act differently?

by john61ct
Jul 29 2021 2:40pm
Forum: Battery Technology
Topic: 18650 vs prismatic - which is safer?
Replies: 30
Views: 638

Re: 18650 vs prismatic - which is safer?

So a fault with the cells used, not the pack design??
by john61ct
Jul 29 2021 2:38pm
Forum: Items for Sale - New
Topic: TIG torch for battery spot welding
Replies: 32
Views: 729

Re: TIG torch for battery spot welding

You can't couple generators together like that - they have no ability to synchronize their waveform. LOL that is a dirt common feature now on dozens of brands. Honda calls theirs Companion https://powerequipment.honda.com/generators/generator-parallel-capability Other advantages besides all-purpose...
by john61ct
Jul 29 2021 11:42am
Forum: EBike General Discussion
Topic: dynamo on a bike
Replies: 49
Views: 3632

Re: dynamo on a bike

This German guy pedaling at 50 mph was likely rocking one of these: http://www.schlumpfdrive.com/index.php/high-speed-drive.html It's a planetary gearbox integrated into the chainring which allows a 1:1 or 1:2,5 ratio allowing the user to e.g. pedal at 20 or 50 mph depending on which gear is chosen...
by john61ct
Jul 29 2021 2:22am
Forum: EBike General Discussion
Topic: dynamo on a bike
Replies: 49
Views: 3632

Re: dynamo on a bike

Arms flailing to power a big fan like those Florida boats
by john61ct
Jul 29 2021 1:10am
Forum: Items for Sale - New
Topic: TIG torch for battery spot welding
Replies: 32
Views: 729

Re: TIG torch for battery spot welding

If not then my preference would be a general purpose genset, say a Honda eu2200i or two coupled together if necessary.

Or the 240V equivalent, better for pumping high amp AC-DC chargers for the battery banks.
by john61ct
Jul 29 2021 12:23am
Forum: Items for Sale - New
Topic: TIG torch for battery spot welding
Replies: 32
Views: 729

Re: TIG torch for battery spot welding

The aluminum high current stuff is secondary at this point

let's say just for battery packs using this gun only.

There is no all in one that includes off grid power generation?