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by John in CR
Mar 29 2020 4:45am
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 18
Views: 639

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

Based on the 150-160°C motor temps I see some talk about (I use a 100°C limit), So.. how much is just a claim and how much is honest overcurrent heating? Noone knows. I got the 180 deg rollback..... Hit her often.... How long do I have, John? My spec is 112A for the lil motor I have, ( phase, publi...
by John in CR
Mar 28 2020 7:46am
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 18
Views: 639

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

According to Justin's thorough testing, ferro fluid adds what 10%-20% to cooling, No. According to the Grin website, "on average roughly doubling the thermal conductivity from the copper windings to the outside environment"..."you can run it at roughly 40% higher sustained torque and power without ...
by John in CR
Mar 27 2020 8:38pm
Forum: General Discussion
Topic: at home test- how to decide to call 911 for covid-19, Possible effective treatment
Replies: 20
Views: 555

Re: at home test- how to decide to call 911 for covid-19

Hey Matt, what does an "oximeter" do exactly? It sounds like an interesting home tool that may be useful, but I want to understand a bit more.
by John in CR
Mar 27 2020 8:30pm
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 18
Views: 639

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

And if you wanna be fair John you should then also mention that you do air cooling with drilled covers, right? do you also brag about it when it starts to rain when you out for a ride :P Only the one I'm running vented is at 31kw peak input, and no I don't worry about rain in the least, since it's ...
by John in CR
Mar 26 2020 10:56pm
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 18
Views: 639

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

Why? The person who has been running higher power through hubmotors than anyone on the forum for almost a decade doesn't waste the time or money (and as it turns out, motors) using FF. I cringe and feel embarrassed for you, the way you so often try to brag about having a high-power hub motor. And n...
by John in CR
Mar 26 2020 10:01pm
Forum: Battery Technology
Topic: BMS for 40 Leaf gen2 modules
Replies: 5
Views: 165

Re: BMS for 40 Leaf gen2 modules

My question is, what BMS would you recommend? I'm leaning towards the Batrium WatchMon 4 with the LeafMon monitors, but that setup would cost me nearly as much (maybe more!) than I spent on the batteries. My main concern with having this many batteries laying around is fires, so any extra advise is...
by John in CR
Mar 26 2020 9:07pm
Forum: Battery Technology
Topic: 90% Battery Charger
Replies: 10
Views: 314

Re: 90% Battery Charger

Just buy a common battery charger (the type with an aluminum housing) for your pack. Remove the top which snaps into place with the 2 top screws on each end plate holding it in place and adjust the potentiometer that controls the voltage cutoff to the voltage you want. There are plenty of youtube vi...
by John in CR
Mar 26 2020 8:36pm
Forum: Motor Technology
Topic: 4x4 RC lawnmover - please help for components
Replies: 8
Views: 347

Re: 4x4 RC lawnmover - please help for components

Why a hybrid instead of pure electric?
by John in CR
Mar 26 2020 8:05pm
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 18
Views: 639

The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid

Why? The person who has been running higher power through hubmotors than anyone on the forum for almost a decade doesn't waste the time or money (and as it turns out, motors) using FF. (moderator note: this group of posts was split off , due to off-topicness, from a thread https://endless-sphere.com...
by John in CR
Mar 24 2020 10:26pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki skydrive 125 electric conversion
Replies: 14
Views: 435

Re: Suzuki skydrive 125 electric conversion

NuVinci N171 was rated for 5kW, and had better than 80% efficiency in all ratios Yes, and at best it was less than 90%, so you're talking about throwing away 10-20% right off the top when a chain drive when done correctly has less than 5% losses. Add in NuVinci's torque limitations and high price, ...
by John in CR
Mar 23 2020 2:53pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki skydrive 125 electric conversion
Replies: 14
Views: 435

Re: Suzuki skydrive 125 electric conversion

I’m not surprised that direct drive is better than CVT in your application, but I am curious what was so awful about CVT? If you're interested in trying CVT's with electric motors, then check with forum member Gwhy. I’m not interested in that. But I can imagine that an appropriate CVT would be usef...
by John in CR
Mar 22 2020 6:40pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki skydrive 125 electric conversion
Replies: 14
Views: 435

Re: Suzuki skydrive 125 electric conversion

Battery placement is the biggest problem with conversions, and why I use only some of the original frame in my builds. In your case, simply give up the step thru part and fill the center with batteries leaving only the portion of the platform you actually use for your feet left and right intact. Wh...
by John in CR
Mar 22 2020 5:59pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki skydrive 125 electric conversion
Replies: 14
Views: 435

Re: Suzuki skydrive 125 electric conversion

I’m not surprised that direct drive is better than CVT in your application, but I am curious what was so awful about CVT? If you're interested in trying CVT's with electric motors, then check with forum member Gwhy. He used the combination of RC outrunner motors with scooter CVT's on multiple build...
by John in CR
Mar 22 2020 5:27am
Forum: E-Vehicles General Discussion
Topic: France bans illegal eMTB tuning with fines up to € 30,000
Replies: 27
Views: 1161

Re: France bans illegal eMTB tuning with fines up to € 30,000

I carry a manufacturer's motor test report that includes a picture of the motor as my proof that I'm operating within the law. I bet you carry some bills to, for some payoff bribes :wink: I'm 100% legal so that would only come into play for speeding. You gotta be careful with that kind of thing tho...
by John in CR
Mar 21 2020 5:31pm
Forum: E-Vehicles General Discussion
Topic: France bans illegal eMTB tuning with fines up to € 30,000
Replies: 27
Views: 1161

Re: France bans illegal eMTB tuning with fines up to € 30,000

What's really sad about those draconian laws is that it's our other brothers on 2 wheels who push for and help craft those ridiculous laws. I live where there's the best ebike law on the planet. An electric motor of 5,000W and up is a motorcycle which has several classes depending on max power. Belo...
by John in CR
Mar 21 2020 5:06pm
Forum: General Discussion
Topic: Active energy transfer balancing
Replies: 15
Views: 1739

Re: Active energy transfer balancing

amberwolf wrote:
Aug 01 2019 1:41am
So if there was a leaky cell (group) that kept dropping in voltage, this balancer would drain the rest of the cells attempting to keep that group alive?...
Yep, IOW a Battery Murdering System that can kill a pack without the BMS actually having a failure.
by John in CR
Mar 21 2020 12:23pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki skydrive 125 electric conversion
Replies: 14
Views: 435

Re: Suzuki skydrive 125 electric conversion

Battery placement is the biggest problem with conversions, and why I use only some of the original frame in my builds. In your case, simply give up the step thru part and fill the center with batteries leaving only the portion of the platform you actually use for your feet left and right intact. Whi...
by John in CR
Mar 20 2020 8:56pm
Forum: Electric Watercraft
Topic: solar sail paddle wheel
Replies: 4
Views: 962

Re: solar sail paddle wheel

Cool. Paddles are some of the most efficient. We build one that has three paddles out of the water at any time.. and 5 paddles in the water. 5 wet/3 dry??? How does that work, since the center of the water wheel would need to be submerged? The paddlewheel in the 2nd video gets a 2 out of 10 in my b...
by John in CR
Mar 20 2020 8:31pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 432
Views: 69662

Re: Suzuki GSX-R e899 K2

The only used battery you can get here in GER is an TESLA 6S 240Ah battery for 1000€. And the weight of one battery is 25kg ... Someone is getting the batteries from all the wrecked cars. Tesla cells won't cut it for a drag bike. They just aren't powerful enough. Too bad so little info is available...
by John in CR
Mar 20 2020 8:18pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Bought Zoom electric scooter / moped $1899 long term Review
Replies: 19
Views: 4293

Re: Bought Zoom electric scooter / moped $1899 long term Review

My Zoom Scooter has been running flawlessly for more than 9 months now! The batteries seem to be holding up very well with no degradation. Scooter is Pretty much maintenance free except for checking my tires and brake pads, and they still seem pretty new. After sales support has been great with Zoo...
by John in CR
Mar 20 2020 8:03pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Race Motorbike for NZ Bucket Class
Replies: 11
Views: 809

Re: Electric Race Motorbike for NZ Bucket Class

There's no 18650 cells which can sufficiently power a 273 70h motor in a 15p pack. You need better more powerful batteries or much more parallel structure. If the tracks are pretty smooth and speeds fairly limited a big hubmotor like that may work ok for racing, though at a significant weight penalt...
by John in CR
Mar 20 2020 6:43pm
Forum: E-Bike Technical
Topic: Horn for 96v battery(24s)
Replies: 6
Views: 369

Re: Horn for 96v battery(24s)

Prefer to directly connect horn to pack. Will (2) 48v horn wired in series work? A nice simple solution if you already have the horns. My only issue with the whole idea is running voltage that high up to the handlebars. For safety reasons I never run pack voltage up to the bars. Good point. I alrea...
by John in CR
Mar 20 2020 5:25am
Forum: E-Bike General Discussion
Topic: Torp 11kW / 29kg mid drive electric free rider prototype
Replies: 20
Views: 1724

Re: Torp 11kW / 29kg mid drive electric free rider prototype

7k euros and only comes in a kid's size judging from the photo...ridiculous.
by John in CR
Mar 20 2020 5:06am
Forum: Motor Technology
Topic: Trying to understand how many amps/watts a motor can actually take.
Replies: 12
Views: 482

Re: Trying to understand how many amps/watts a motor can actually take.

Current handling is determined by the phase-to-phase resistance. Measure that (and make sure it's essentially the same for all 3 combos while you're at it to make sure there aren't any winding problems) and post it here. Motors of the same model wound to different Kv's will have drastically differen...
by John in CR
Mar 13 2020 2:51pm
Forum: E-Bike Technical
Topic: Motor running backwards
Replies: 11
Views: 330

Re: Motor running backwards

So the supposedly "learn function" didn't work, but I figured out the correct sequence anyway. I actually prepared a setup for the whole marathon, and the second combination seemed to work. Hall and phase had to be classic Y - G - B, but reversed order. Could have left the phase wires soldered and ...