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by john61ct
Nov 29 2021 10:37am
Forum: EBike General Discussion
Topic: Courier ebike project advice
Replies: 25
Views: 378

Re: Courier ebike project advice


Neowise wrote: - The frame is a tank. I feel it was designed for delivery guy who spend their days rolling in New York Manhattan's pothole-full streets.
old school steel, chromoly?

by john61ct
Nov 29 2021 5:24am
Forum: EBike General Discussion
Topic: Courier ebike project advice
Replies: 25
Views: 378

Re: Courier ebike project advice

No the boxes were metal, fully covered and lockable top,

a yard across, at least that high and 4-5' long.

Some ice cream vending trikes look similar but lower profile.
by john61ct
Nov 28 2021 11:42pm
Forum: Battery Technology
Topic: Battery Failure
Replies: 7
Views: 117

Re: Battery Failure

When not being used, store cells cool, low SoC and 100% isolated from any electronics, especially BMS type monitoring gear.

Be physically present and closely monitoring while actively cycling.
by john61ct
Nov 28 2021 3:44pm
Forum: EBike Build Threads
Topic: Dahon Folder Grin Kit Conversion
Replies: 5
Views: 136

Re: Dahon Folder Grin Kit Conversion

A towel is just about the most massively useful thing an interstellar hitchhiker can carry. Partly because it has great practical value. You can wrap it around you for warmth as you bound across the cold moons of Jaglan Beta; you can lie on it on the brilliant marble-sanded beaches of Santraginus V...
by john61ct
Nov 28 2021 2:28am
Forum: EBike Technical
Topic: Wildly different battery readings
Replies: 3
Views: 237

Re: Wildly different battery readings

The calculation/display of SoC% is at best wildly inaccurate, at worst meaningless blinky lights to be largely ignored. Best is a coulomb-counting watt meter using a shunt, set to work in both directions shows Ah drawn since last fully charged, reset to 100% SoC. Also how many Ah flow past in rechar...
by john61ct
Nov 28 2021 2:18am
Forum: EBike Build Threads
Topic: Dahon Folder Grin Kit Conversion
Replies: 5
Views: 136

Re: Dahon Folder Grin Kit Conversion

Link to your battery source?
by john61ct
Nov 27 2021 7:10pm
Forum: EBike General Discussion
Topic: Courier ebike project advice
Replies: 25
Views: 378

Re: Courier ebike project advice

In the 50's and 60's the streets of New York had hundreds of push cart bikes, very big box up front could fit a couple of bodies at least.

I wonder why that traditional design hasn't been adapted for electric?
by john61ct
Nov 27 2021 1:50am
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 189

Re: Contactor question

The FET based units at such high power use cases are just not as reliable robust, long-lived

cheap Chinese versions even more unrealistically rated.

I would love to be proven wrong.
by john61ct
Nov 27 2021 1:34am
Forum: EBike General Discussion
Topic: need controller advice please
Replies: 7
Views: 201

Re: need controller advice please


justlooking808 wrote:i got an Oem ried1up core 5
Link please?

by john61ct
Nov 26 2021 7:48pm
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 189

Re: Contactor question

Happy Holidays @methods
by john61ct
Nov 26 2021 7:46pm
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 189

Re: Contactor question

Going much higher in DC voltage capacity rating cannot hurt. Certainly make sure to ignore the AC rating completely. But the ampacity maximum stated is what is particularly suspect. Testing a few hundred cycles to destruction would give the real answer but then many cheap-Chinese can't be relied upo...
by john61ct
Nov 26 2021 5:05pm
Forum: Battery Technology
Topic: KONNWei 208 lead acid battery tester
Replies: 1
Views: 67

Re: KONNWei 208 lead acid battery tester

A shunt based coulomb counting wattmeter does a decent job so long as you have a load you can adjust to keep Current Constant over the 20-hours test or whatever you choose as your standard. But a Dummy Load that does so automatically is much more precise. However, I would advise converting over from...
by john61ct
Nov 26 2021 4:23pm
Forum: EBike Technical
Topic: Contactor question
Replies: 12
Views: 189

Re: Contactor question

Are you trying to go cheap, say too far under $100? Cheap Chinese need to be very deeply de-rated by half or more. I assume you want it to work under load more than just a few dozen cycles? Mechanical better than SS TE, Tyco, Potter & Brumfield, Gigavac, Kilovac, Schneider, ABB, Crydom, Crouzet ...
by john61ct
Nov 25 2021 9:53pm
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 822

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

Perhaps since the educational value of the "Grin vs KT display" has pretty much run its course, of good reference value for others

Maybe worth opening a new thread on KT specific topics like these data comms protocols
by john61ct
Nov 25 2021 9:48pm
Forum: EBike Technical
Topic: DIY Mini ebike battery configuration system
Replies: 2
Views: 88

Re: DIY Mini ebike battery configuration system

C-rate is always proportional to Ah So C-rate stays the same as you add more packs, paralleling or in serial. The wiring harness is fine long as you know what you're doing. Make sure packs you parallel are the same S-count **and** very close to same voltage before connecting. IMO the rig is dangerou...
by john61ct
Nov 25 2021 1:47pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 132
Views: 5908

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


BalorNG wrote:They did, this is 120A and this is basically package limit an firware limit.
Ah so I missed that.

100A battery maximum

120A phase maximum

Is that correct? At this point definitive as the vendor rating?

by john61ct
Nov 25 2021 11:29am
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 132
Views: 5908

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

OP states the unit can handle 7000W? My point is not that Flipsky "should not" give us at least a ballpark phase amps spec. But so far they haven't,and that is the reality we need to deal with. I am sure over time some range will be revealed by the tech-savvy early adopters along with all ...
by john61ct
Nov 24 2021 10:41pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 132
Views: 5908

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

John Im not saying they gave Fake specs or so, they have been 100% transparent to all asking them. But for a newbie Reading 100amp max DC amp can lead to understand motor amps Can be set near 250amps. That is not of concern to me personally. It would be great for the actual phase amps limit to be s...
by john61ct
Nov 23 2021 5:05pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 132
Views: 5908

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

ahem
atkforever wrote:I've contacted them asking if 100amps would stand for phase amps, they replied it's battery current.
by john61ct
Nov 23 2021 4:31pm
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 822

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

It might work with other controllers, but it does not appear that it will program controllers, since say KT uses a proprietary protocol. Yes, if there is a display used to program a given controller, it is proprietary, that is true for all controller brands. The CAv3 is not such a device. It has no...
by john61ct
Nov 23 2021 3:04pm
Forum: Motor Technology
Topic: FLIPSKY new 20s 100A tiny controller (vesc based)
Replies: 132
Views: 5908

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

Just because that is the user imposed limit in a video, does not mean their power claim of 100 battery amps is any more "false" than other vendor ratings. We all know such ratings should not be approached IRL unless testing to destruction 80% is the closest IMO when reliability & longe...
by john61ct
Nov 23 2021 1:16am
Forum: Battery Technology
Topic: APL's Pressure Contact Battery box
Replies: 138
Views: 3627

Re: APL's Pressure Contact Battery box

I found pure copper swaging stops - like a little donut cylinder easily goes to a parallel smooth sided disc shape with a big pair of Knipex parallel jaw pliers, 16" version I think it was. Inserting fine stranded tinned copper boat cable first, say 10 AWG or down to 14 if that's all that's nee...
by john61ct
Nov 23 2021 12:57am
Forum: EBike Build Threads
Topic: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?
Replies: 39
Views: 822

Re: What can a Grin controller + cycle analyst do that KT controllers + KT display can't do?

The CAv3 adds temperature protection throttle rollback.

It is a "meta" controller does not try to communicate with the "dumb" controller

justs adjust the throttle input.
by john61ct
Nov 22 2021 9:08am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 152
Views: 6257

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

Which of these are stonger carrying a big load up a long steep hill

IOW will shed heat the longest, assume a CAv3 will prevent damage