Search found 6539 matches

by john61ct
Sep 23 2021 1:11am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 107
Views: 3498

Re: E-bike mid-drive motors hardly outperforms hub motors

Never say "always".

I'm shooting for 400# if possible and crossing steep mountains, long ling climbs.

I don't think GMAC could handle it, magic smoke would escape.

Here's a reasonable thread to parse
viewtopic.php?t=50703
by john61ct
Sep 23 2021 12:56am
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 83
Views: 2493

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

The upstream capacity has little to do with that specific gadget. And as always, assuming they are honest is pretty silly. With this sort of gear, do your due diligence and try to verify all claims. NEMA 5-15 standard is intended for 110-125V only. It is also rated for 15A only. It is very common fo...
by john61ct
Sep 22 2021 11:46pm
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 83
Views: 2493

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

Are you sure **each** of those 4 outlets handles 20A?

80A total, 17.6kW?

That would recharge a 35Ah 72V (32S) LTO bank in ten minutes. Tech readily available today. . .
by john61ct
Sep 22 2021 11:16pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 107
Views: 3498

Re: E-bike mid-drive motors hardly outperforms hub motors

Best to deal with reality as it is

if wishes were fishes…
by john61ct
Sep 22 2021 11:12pm
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 83
Views: 2493

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

My point has nothing to do with "us" actually being a problem. The point is, the EV industry is only funding its networks for selfish reasons idealism has zero to do with it. Helping their wealthy customers full of righteous indignation feel smugly superior excluding those poorer, even jus...
by john61ct
Sep 22 2021 11:04pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 107
Views: 3498

Re: E-bike mid-drive motors hardly outperforms hub motors

Geared hubs are much less efficient at shedding heat, and also melt down at much lower temps.

So heavy weights & big steep hills likely better off with DD.

Or a bif geared mid drive best of all. Check out Lightning Rod's big blocks. . .
by john61ct
Sep 22 2021 10:46pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 107
Views: 3498

Re: E-bike mid-drive motors hardly outperforms hub motors

Geared hub drives vs DD hubs

no such thing as DD geared

any more than mid-drive hub motors

yes we know what you mean but…
by john61ct
Sep 22 2021 10:42pm
Forum: EBike General Discussion
Topic: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction
Replies: 83
Views: 2493

Re: Very Impressed by fast motor winding with gear reduction vs. Slow motor Winding without gear reduction

No ratting needed the charger identifies you before granting access cameras, face recognition licence plate readers all in place and working well for years. Publicly owned tax funded stations, maybe can convince the owning org to make exceptions through political activism But privately owned station...
by john61ct
Sep 22 2021 2:34pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 25
Views: 564

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

But in these discussion it is often stated that there are big efficiency losses when the usual average RPM is much lower than the top speed. That the voltage / winding Kv should be selected so that the top possible speed is only a little higher than the top speed the user actually wants. In motor se...
by john61ct
Sep 22 2021 1:53pm
Forum: EBike Technical
Topic: Most powerful hub motor below 5lbs
Replies: 32
Views: 4966

Re: Most powerful hub motor below 5lbs


Balmorhea wrote:My dad would call it "una trampa pa' coger misiules".
as in missiles?

Misiulės is the closest I got but it's Lithuanian

by john61ct
Sep 22 2021 1:26pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 115
Views: 8460

Re: True FOC: definition and examples

Tiny and cheap VESC 72V 100A (phase amps or battery? )

viewtopic.php?p=1677954#p1677954

Question, being VESC, automatically means yes "true FOC"?
by john61ct
Sep 22 2021 1:23pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 25
Views: 564

Re: FLIPSKY new 20s 100A tiny controller (vesc based)

Actually revisiting the OP, I see 20S right in the specs, so I don't feel so smart [emoji38] True FOC control is a given with VESC right? https://endless-sphere.com/forums/viewtopic.php?t=105139 The next question, for me anyway I don't care about speed, how does the unit put out at low rpm torque sc...
by john61ct
Sep 22 2021 1:05pm
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

I sent Em3EV an e-mail with questions. Their chargers sale page are full of dead links and not linked to from the homepage so I'm not sure they sell them separately right now. They used to be stellar, **much** more consistent than Luna, run by a Brit living in China. Lots of bad reports in the past...
by john61ct
Sep 22 2021 1:01pm
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

It is only 3A and @john61ct recommended against going lower than 4A. If you're OK with the fastest from-depleted recharge session being 6-7hrs, go for it but I'd bet you'll regret it, IMO closer to 8A the better. Keep in mind if holding CV/Absorb, you should be stopping at 2A, and since that is onl...
by john61ct
Sep 22 2021 12:52pm
Forum: EBike General Discussion
Topic: Ebike kit I can carry in airport and charge my Macbook
Replies: 62
Views: 930

Re: Ebike kit I can carry in airport and charge my Macbook

Just an occasional "power boost" not an actual ebike IMO power too low, range too short

Order lots of extra friction tape kits, and let us know how you go.
by john61ct
Sep 22 2021 12:37pm
Forum: EBike Technical
Topic: Range question about adding a geared kit on top of a direct drive kit
Replies: 3
Views: 78

Re: Range question about adding a geared kit on top of a direct drive kit

Yes your total Ah available is greater with one big battery rather than swapping.

You will also get a lot more burst power when needed, lots less voltage drop and stress on the pack.

And by halving your average C-rates, get much longer cycle lifespan out of both sub-packs
by john61ct
Sep 22 2021 12:25pm
Forum: EBike General Discussion
Topic: Ebike kit I can carry in airport and charge my Macbook
Replies: 62
Views: 930

Re: Ebike kit I can carry in airport and charge my Macbook

Have you seen the Qiroll kit? https://qirollshop.com/product/qre-muteb60/ It's a friction drive small enough to fit in a pocket. The total kit is under 2kg. It does fit most bikes and I just need a small screwdriver to install it on a bike. It looks like it can be done in 10 min or so. I'm not talk...
by john61ct
Sep 22 2021 12:22pm
Forum: EBike General Discussion
Topic: Ebike kit I can carry in airport and charge my Macbook
Replies: 62
Views: 930

Re: Ebike kit I can carry in airport and charge my Macbook

Now... if only I could use my USB C charger to ALSO charge my battery that would be even better. Can't manage to find any adapter for that. Because the spec tops out at 100W or so. Really sorry, but the miniscule power levels you're talking about are hardly worth all this trouble. And going so chea...
by john61ct
Sep 22 2021 11:40am
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

You do not need to understand everything I discussed, but it is pretty basic level Parse it slowly, do some googling for terminology, then feel free to ask specific questions read past threads here you'll pick up a lot, it just starts to sink in. Beside the right gear, good knowledge is required for...
by john61ct
Sep 22 2021 11:32am
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

Have you asked Em3EV for recos on specific chargers? My reco is Grin's Satiator, user friendly and super flexible! Their model #4808 "24V-52V" output, actual range is 24-63V @8A (manual states 12-63V) Many say these are good, apparently what Ping sells: https://kingpan.m.en.alibaba.com/pro...
by john61ct
Sep 22 2021 11:11am
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

There are relatively cheap chargers that have a basic A/B switch for charging level often claiming 80% vs 100% SoC but that is rarely accurate. Need to actually log the V&A for each setting with a DMM and ammeter to see what's what and personally I would only buy that type if the precise voltage...
by john61ct
Sep 22 2021 11:07am
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

The dumbest "charger" is no charger at all, just a PSU or DC-DC converter without any stop-charge functionality. A simple LVC circuit / relay that cuts off its input when the pack leads reach the desired voltage setpoint is really all that's needed for LI cells. For balancing purposes, a t...
by john61ct
Sep 22 2021 10:52am
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

What is the total Ah capacity the pack is rated for?

A 0.3C charge rate would be the lowest I would recommend. 0.2C would mean up to 5hours needed to refill from "empty"

For longevity purposes stay below 0.4C.
by john61ct
Sep 22 2021 10:49am
Forum: EBike General Discussion
Topic: Can anyone recommend a charger?
Replies: 20
Views: 220

Re: Can anyone recommend a charger?

You want a charger whose CV setpoint can be adjusted between 57V and 59V, which includes from below 4.10Vpc up to 4.20Vpc. The latter may be needed for occasional maintenance like top balancing and precise cap test benchmarking. For normal usage cycling, choose between 4.10 and 4.15Vpc to get better...