Search found 838 matches

by parajared
Jun 06 2018 12:53pm
Forum: E-Bike Technical
Topic: random cogging issues
Replies: 4
Views: 449

Re: random cogging issues

Every time I've had intermittent jerky power, it has been the phase wires touching somewhere.
^this
by parajared
Jun 06 2018 12:44pm
Forum: E-Bike Technical
Topic: Biggest Ah 36 volt battery pack.
Replies: 20
Views: 1758

Re: Biggest Ah 36 volt battery pack.

I sometimes run 44 volts 30ah. I run this high of ah when I am trying to exceed 100 miles in one go or hauling something heavy.

I accomplish this by depleting 10ah in my battery box at a time. I bought some panniers and I just toss a couple extra packs in if needed.
by parajared
Jun 06 2018 11:59am
Forum: E-Bike Technical
Topic: Which motor and battery for touring rinding with some hills
Replies: 65
Views: 5737

Re: Which motor and battery for touring rinding with some hills

It’s heat that kills hubs and batteries and if are intending situations of high heat buy some heat sink fins and fill the hub with transformer oil and fit a heat sensor to monitor heat output. You remind me of my buddy who overclocks his computer CPU and uses a bunch of expensive cooling techniques...
by parajared
Jun 06 2018 11:51am
Forum: E-Bike Technical
Topic: Which motor and battery for touring rinding with some hills
Replies: 65
Views: 5737

Re: Which motor and battery for touring rinding with some hills

I would use a direct-drive hub motor over a mid-drive or a planetary due to reliability. As mentioned above you need enough wattage to accomplish your tasks otherwise your motor will overheat. My best guess is 2 kilowatts continuous to be safe. 24 volts would be just fine if you could find the right...
by parajared
Jun 06 2018 10:45am
Forum: Electric Aircraft
Topic: E plane pulls a glider aloft
Replies: 4
Views: 1898

Re: E plane pulls a glider aloft

They must be using some new tech batteries. What these might be? What's in E-aviation? Presumably once Tesla's "gigafactories" kick into gear they will use Tesla cells. This is starting to "take-off" (pun intended) because the energy density/weight ratio of batteries is starting...
by parajared
May 31 2018 3:48pm
Forum: E-Bike General Discussion
Topic: E-trike Aluminum vs steel frame
Replies: 30
Views: 2536

Re: E-trike Aluminum vs steel frame

okay, I feel like I'm going to regret this but here we go, I use a 4-in-series cable and I use U shaped plugs to change the series count. So that's 12s, 18s, and 24s and 22mph, 35mph, and 42mph respectively. For simplicity sake let's define "efficiency" as watt-hours per mile drawn from th...
by parajared
May 29 2018 11:12am
Forum: E-Bike General Discussion
Topic: E-trike Aluminum vs steel frame
Replies: 30
Views: 2536

Re: E-trike Aluminum vs steel frame

Now I have not tested this yet maybe you guys have but its my thinking running at top rpm will give the most miles per AH. It's how I understand the ebike.ca motor calculator so have been running at top speed / rpm as much as possible. If the wind is calm its flat out both ways if not its flat out ...
by parajared
May 23 2018 3:08pm
Forum: E-Bike Technical
Topic: Sensorless versus Heat
Replies: 3
Views: 399

Re: Sensorless versus Heat

Wires (depending on the wire) tend to crap out on you at about 200 Celcius. Motors (depending on the motor) tend to start seeing issues as early as 120 C. You want larger wires to avoid IR and voltage sag but I believe it more likely that you will destroy the laminations (that film around your coppe...
by parajared
May 23 2018 2:53pm
Forum: E-Bike General Discussion
Topic: E-trike Aluminum vs steel frame
Replies: 30
Views: 2536

Re: E-trike Aluminum vs steel frame

I am thinking of putting the panels on a trailer.
Putting the panels on a trailer is a perfectly sound idea.
I went Aluminum instead of PVC
Also a good idea. PVC sucked! Way too floppy.
by parajared
May 22 2018 5:33pm
Forum: E-Vehicles General Discussion
Topic: Would a wind powered car work?
Replies: 21
Views: 3107

Re: Would a wind powered car work?

Now there's a party truck if I've ever seen one! You could get a band and a full bar on that thing. (And a few jacuzzis, too) But I was thinking more along the lines of: https://www.kvaser.com/kvaser-sponsors-chinook-ets-wind-powered-car/ mind blown! I want a toy-sized one now. https://www.kvaser.c...
by parajared
May 22 2018 5:25pm
Forum: E-Vehicles General Discussion
Topic: Would a wind powered car work?
Replies: 21
Views: 3107

Re: Would a wind powered car work?

Or e) a big wind turbine on top of the car, which only works if there's enough wind. (And this actually works; strange but true.)
Hmm... like if you put a Vestas V164 on a Mobile Launcher Platform?
by parajared
May 22 2018 5:16pm
Forum: Electric Aircraft
Topic: A hybrid aircraft, using a SMART diesel
Replies: 1
Views: 1462

Re: A hybrid aircraft, using a SMART diesel

"Oh crap, we're not going to make it!" "somebody start the generator!"
by parajared
May 22 2018 4:55pm
Forum: E-Vehicles General Discussion
Topic: Would a wind powered car work?
Replies: 21
Views: 3107

Re: Would a wind powered car work?

yes, but not the way you are thinking... you know with that pesky "conservation of energy" rule and all. option A) you would compress air into a big super-scuba tank and blast the air into a piston kinda like a gasoline explosion. option B) you would make a land sail and wind-surf your way...
by parajared
May 22 2018 4:41pm
Forum: E-Vehicles General Discussion
Topic: Solar Cycle Analyst?
Replies: 4
Views: 1205

Re: Solar Cycle Analyst?

I use a CA with my solar setup but I don't have anything fancy that measures amperage input on the CA side of things. I can however see the amperage coming from the solar panel on the charge controller display. Voltage is displayed on the cycle analyst. The battery sags the solar voltage way down so...
by parajared
May 22 2018 4:22pm
Forum: E-Vehicles General Discussion
Topic: How do I know if I need a battery isolator?
Replies: 3
Views: 1014

Re: How do I know if I need a battery isolator?

In parallel no, in series yes (sorta).

Alternately you can ride around, deplete one pack, plug in the next one.
by parajared
May 22 2018 3:36pm
Forum: E-Bike General Discussion
Topic: E-trike Aluminum vs steel frame
Replies: 30
Views: 2536

Re: E-trike Aluminum vs steel frame

I've hauled about 75lbs with mine if that helps...

Image
by parajared
May 18 2018 1:31pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

The fact of the matter is that for a given stator and magnet combo, peak torque at reasonable efficiency is limited by the flux density in the magnetics or the heating effect in the copper.

If you want more torque, use a bigger stator and rotor. Period. Or a gearbox...or stronger magnets.
by parajared
May 18 2018 1:26pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

That's the problem though, that isn't the bottom line. I don't know why you started talking about re-winding, that's not what the OP was asking about. Because the MAXIMUM torque a motor can do is a fixed thing. It cannot be magically increased by rewinding it, it can't be magically increased by add...
by parajared
May 18 2018 12:49pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

I think this is a good example of making sure you are swift and explicitly clear in your explanation. Since I didn’t really make myself clear over the span of a number of posts the matter ended up getting exhausted and ended in a deadlock instead. I think I could have had this rabble sorted out abou...
by parajared
May 16 2018 8:07pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

Let me start over: Can we agree that larger magnets and more copper would make for a more torquey motor? -because Gauss provides the magnetic repulsion -because copper provides the electrical repulsion If your answer is yes why do you think that skinnier copper wire wrapped more times for less kv an...
by parajared
May 16 2018 6:59pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

Let me say it again for effect:
The magnets don't care what kind of repulsion they are getting. It can be volt heavy, it can be amp heavy. 10amps 20 volts of repulsion is the same as 20amps 10 volts of electromagnetic repulsion.
by parajared
May 16 2018 6:37pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

We aren't comparing two systems of different wattage capabilities (or should I say phaseamp capabilities) because wattage is weight and size (more copper fill, more magnet). I don't think the idea in question is if a big beefy BLDC motor is capable of more wattage (fine okay phaseamps) than a little...
by parajared
May 16 2018 6:30pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

Although the (unloaded) speed of a motor has a direct relationship to the phase voltage and the torque has a direct relationship with phase amps, there is no place in motor equations where the voltage and current terms appear together as a product (watts) which would in turn suggest that the produc...
by parajared
May 16 2018 12:10pm
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

yeah, an issue of perception I think. I see the subject very differently than everyone else it seems. Fetcher said You will have some increase in torque and acceleration with a higher pack voltage the OP said My gut feeling would have guessed the higher voltage would improve climbing ability/torque,...
by parajared
May 16 2018 11:02am
Forum: E-Bike Technical
Topic: Difference in acceleration with different voltage?
Replies: 38
Views: 2200

Re: Difference in acceleration with different voltage?

Not only hijacked a thread about a simple comparison of two specific battery packs, but the hijacking is filled with misinformation. Not recommended reading. And what about the right to speak your mind? You can't just falsely accuse someone of hijacking. It's not hijacking if you are trying to stop...