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Old 08-02-2011, 02:26 PM   #121
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Originally Posted by MazDilla View Post
Your post has got me lurking hardcore over on the ES forums.
It's funny, actually.

Endless-Sphere seems to be the EV equivalent of MiataTurbo. Lots of hardcore guys running massively-powerful homebrewed systems, some of which have ventilation holes shaped like little penises cut into the motors. And more than the occasional spectacular failure.


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I like the clean simple battery pack in your Amped kit, but it sounds a little weak. Would you recommend upping the volts? Perhaps changing to a 48v 15 Ah LiFePo4 pack in a trunk bag on the back rack?
Well, in retrospect I might have done things a bit differently.

I went with Amped primarily because this was my first foray into electric bicycling, and they seemed to have the cleanest, most complete-looking kit. Now, to be certain, there's nothing particularly wrong with the system. It's perfectly adequate for my needs. It won't climb a hill of any significant on the motor alone, but given that the whole point for me is to get some exercise, that's not a particularly bad thing.


Moving to a higher voltage system will obviously buy you some extra torque, but just as upping the boost beyond a certain point starts to put Miata drivetrains at risk, as you increase the voltage you also increase both the current and the wattage in the system, and that's when things like beefier controller come into play.
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Old 08-02-2011, 04:43 PM   #122
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Originally Posted by Joe Perez View Post
It's funny, actually.

Endless-Sphere seems to be the EV equivalent of MiataTurbo. Lots of hardcore guys running massively-powerful homebrewed systems, some of which have ventilation holes shaped like little penises cut into the motors. And more than the occasional spectacular failure...
SO TRUE. (maybe Rick should buy it)

I would probably have Brain, uh, I mean Lyen, build a controller for me.

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Well, in retrospect I might have done things a bit differently...

Moving to a higher voltage system will obviously buy you some extra torque, but just as upping the boost beyond a certain point starts to put Miata drivetrains at risk, as you increase the voltage you also increase both the current and the wattage in the system, and that's when things like beefier controller come into play.
48v is the next step up. I was curious if you thought one step up was enough for no pedaling or if one should plan a 60v system.

I cruised around on SLA electric scooters in China (visiting the in-laws) and the damn things were a blast.
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Old 08-02-2011, 04:46 PM   #123
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he does own an RC site.
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Old 08-02-2011, 04:55 PM   #124
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Canadian sites don't count. It's like a billboard in the forest.

Last edited by MazDilla; 08-02-2011 at 07:45 PM.
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Old 08-03-2011, 02:29 AM   #125
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Originally Posted by MazDilla View Post
48v is the next step up. I was curious if you thought one step up was enough for no pedaling or if one should plan a 60v system.
I only have one datapoint, so I really can't say with any certainty. Using the planetary-geared motor instead of the DD might buy you the ability to climb hills unassisted, but it'll be slower than hell; the actual motors in the geared hubs are much smaller, and rated in the neighborhood of 350-450 watts continuous, rather than the 500-750 watt continuous rating of the direct-drive motor. (I assume that those ratings assume 100% duty-cycle at 36 and 48v respectively, though I can find no evidence to support this.)

There's a neat little simulator you can play with here: http://www.ebikes.ca/simulator/

Problem is that I don't know the exact internal specs of the motor. It appears to be a slightly higher-quality knockoff of a NineCo "28" series design, but I've never been able to find hard data on the windings. Amped is fairly tight-lipped about the details of their system, and in all honesty, the owner (Danny) isn't exactly an engineer- I've spoken with him on several occasions, and he doesn't really understand electronic theory. He's just a guy who imports stuff from China and re-packages it. On the plus side, they do have good QC and the stuff is of consistently reasonable quality, just don't expect to have a high-level EE conversation with them.
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Old 08-08-2011, 09:48 AM   #126
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I didn't want to start a new thread for this, so I'm going to just put this right here.

http://omaha.craigslist.org/cto/2528116918.html
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Old 08-08-2011, 10:10 AM   #127
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I like.
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Old 08-08-2011, 10:49 AM   #128
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I didn't want to start a new thread for this, so I'm going to just put this right here.

http://omaha.craigslist.org/cto/2528116918.html
That is actually fairly cool.

How much do 10-12 Deep cycle industrial batteries weigh? 40# a battery?

60 miles of city driving @ 35mph average would get me to and from work nicely..
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Old 08-08-2011, 10:55 AM   #129
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That is actually fairly cool.
How much do 10-12 Deep cycle industrial batteries weigh? 40# a battery?
Probably closer to 60. The big deep cycles in my boat are 74 lbs.
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Old 08-22-2011, 04:25 PM   #130
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Old 08-23-2011, 12:24 PM   #131
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Useless on long hills.
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Old 09-28-2011, 10:47 PM   #132
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Well, I suppose it was inevitable.

It's a vehicle. It has wheels and a motor. And I own it.

It had to be hot-rodded.





The wiring and tie-wraps are temporary (this is just a proof-of-concept) but it's really amazing what a difference another 12 volts makes. Picked up a pair of 12v 10Ah deep-cycle SLAs, wired them in parallel, then put that in series with the main 36v battery.

It's always been fun to pass the spandex-clad crowd as they're gunning it up a hill at full-tilt-boogie. Now I can pass them like they're standing still.


The problem is that now I want even more, and yet I'm out of headroom. The FETs in the controller I have are only rated for 60v, so I've reached the voltage limit of the current setup.
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Old 09-28-2011, 11:09 PM   #133
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You can hack him.

You have the technology.

You can make him better. Stronger. Faster.

(Cut away to digital speedometer creeping past 55...57...topping out at 60.)
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Old 09-29-2011, 12:58 AM   #134
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Controller? Pansy. Wire that ****** directly into the motor. With a big "go baby go" button to activate the circuit.
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Old 09-29-2011, 01:07 AM   #135
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Controller? Pansy. Wire that ****** directly into the motor.
The motor is a three-phase brushless unit. You can't just wire a battery directly to it- the "controller" is both a power regulator and a synchronous inverter.
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Old 09-29-2011, 10:58 AM   #136
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Quote:
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The motor is a three-phase brushless unit. You can't just wire a battery directly to it- the "controller" is both a power regulator and a synchronous inverter.
just run it bumper car style.

get three poles with wiper arms on them and ride only under massive power lines.

THAT would be an impressive feat of technology.

incidentally, there is a substantial system of bike paths in northern virginia that are built on right-of-ways that now parallel power lines.



it could work, I swear
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Old 09-30-2011, 04:41 PM   #137
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The problem is that now I want even more, and yet I'm out of headroom. The FETs in the controller I have are only rated for 60v, so I've reached the voltage limit of the current setup.
Well, the front wheel doesn't have a motor yet, does it?
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Old 09-30-2011, 04:47 PM   #138
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Well, the front wheel doesn't have a motor yet, does it?
It does not. And they do make FWD hubmotors for people who are afraid to touch their chain and gearstack.

Doing this, however, would double the current draw on the battery, and my main battery (the 36v lithium) is internally current-limited. So I'd basically need not just a second motor and controller, but a whole second battery stack as well.

No, I'm sticking with RWD on this one. The next evolutionary step will retain the current motor and battery and replace the controller with one capable of operating at 72v.

Going from 36v to 48v made the difference between "underwhelming" and "adequate," but it's not scary-fast yet. I think we can get there.
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Old 09-30-2011, 04:48 PM   #139
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I guess you just need a good place up front to put all of your electronics in...

Here you go-


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Old 10-01-2011, 10:24 AM   #140
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Apparently no one liked my old Six Million Dollar Man opening credits reference.






















Or, maybe it just wasn't that good.
Or hardly anyone on here remembers watching that back in the 80's.
Or they just weren't born yet.

:lol:
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