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Search: Posts Made By: Little-Acorn
Showing results 1 to 50 of 163
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Forum: Electric Bikes
05-14-10, 04:34 PM
Replies: 6
Views: 1,321
Posted By Little-Acorn

I've put together two conversion kits so far....

I've put together two conversion kits so far. Both 48V 1000W, plus 20Ah LiFePO4 batteries, all from different vendors, all from China.

Zero problems so far. Everything plugged together and worked...
Forum: Electric Bikes
05-04-10, 05:38 PM
Replies: 128
Views: 11,405
Posted By Little-Acorn

nwmtnbkr, drivers understand hand signals by...

nwmtnbkr, drivers understand hand signals by people on bikes, just fine.

The signals mean, "Aim here."

Surely you knew that. :D
Forum: Electric Bikes
04-14-10, 01:30 PM
Replies: 11
Views: 2,232
Posted By Little-Acorn

Yep, guess I didn't use the names right. Though...

Yep, guess I didn't use the names right. Though I've frequently heard LiFePO4 batteries referred to as "Lithium Ion".

But my point stands. I wish the media would correctly identify the kind of...
Forum: Electric Bikes
04-14-10, 11:26 AM
Replies: 11
Views: 2,232
Posted By Little-Acorn

"Lithium" battery explodes in FedEx warehouse in San Diego

There was an explosion in a FedEx office this morning (Wednesday, April 14) here in San Diego, maybe four miles from where I live. Apparently a box with some kind of lithium batteries in it, went...
Forum: Electric Bikes
04-09-10, 01:41 PM
Replies: 1,066
Views: 1,049,174
Posted By Little-Acorn

Here's my Schwinn Cimarron 21-speed. 48V, 1000W...

Here's my Schwinn Cimarron 21-speed. 48V, 1000W front hubmotor, 20Ah LiFePO4 battery.

.
Forum: Electric Bikes
03-17-10, 07:03 PM
Replies: 25
Views: 5,545
Posted By Little-Acorn

Actually, ebikes that go up to 30mph are legal in...

Actually, ebikes that go up to 30mph are legal in California. See DMV Code 406(a) and 24015. But they have to have junk like headlight, taillight, brake lights, and horn; and you have to have a moped...
Forum: Electric Bikes
03-06-10, 07:58 PM
Replies: 12
Views: 7,374
Posted By Little-Acorn

That's the usual rider's definition, and it's a...

That's the usual rider's definition, and it's a good one.

Then there's the legal definition, which is different for different states.

California, for example, defines two different classes of...
Forum: Electric Bikes
02-27-10, 03:53 PM
Replies: 6
Views: 1,191
Posted By Little-Acorn

Apparently California law recognizes two...

Apparently California law recognizes two different classes of Ebikes: Those with a top speed of 20mph, and those with a top speed of 30mph. Anyghint faster than that isn't an Ebike, it's a...
Forum: Bicycle Mechanics
02-06-10, 03:13 PM
Replies: 13
Views: 44,908
Posted By Little-Acorn

Thanks, JanMM, the Sheldon Brown tables help a...

Thanks, JanMM, the Sheldon Brown tables help a lot.

Apparently 28" and 29" *both* fit 700c rims.

But some 26" tires don't fit 26" rims, while others do.

Explaining this to my 11-year-old...
Forum: Bicycle Mechanics
02-06-10, 02:35 PM
Replies: 13
Views: 44,908
Posted By Little-Acorn

What are 28-inch and 29-inch tires?

I grew up among 27" tires on road bikes, and 26" and 24" tires on beginners bikes, tandems, etc. Then I noticed a new size, 700c, that was almost identical to 27" but not quite. Still haven't quite...
Forum: Electric Bikes
02-01-10, 11:30 AM
Replies: 18
Views: 2,948
Posted By Little-Acorn

Newb, I'd think twice about getting a...

Newb, I'd think twice about getting a lithium-polymer (LiPo) battery. They are powerful and fairly lightweight, slightly more so than an equivalent Lithium-Iron-Phosphate (LiFePO4) battery. But if...
Forum: Electric Bikes
01-22-10, 02:24 PM
Replies: 2
Views: 906
Posted By Little-Acorn

Let's see. The number of people on ebikes...

Let's see.
The number of people on ebikes increased by 2500x.
The number or deaths on ebikes increased by 73x.

Explain to me again, why this is considered a problem?

Hell, sounds like if they...
Forum: Electric Bikes
01-01-10, 12:33 AM
Replies: 14
Views: 4,694
Posted By Little-Acorn

First cruise of any length today. Actually it was...

First cruise of any length today. Actually it was more of a let's-beat-on-it-for-long-times-and-see-how-it-does run. Started from my house, pulled onto a long, fairly new dedicated bike path leading...
Forum: Electric Bikes
12-31-09, 08:38 PM
Replies: 6
Views: 3,932
Posted By Little-Acorn

Sure enough, nwmtnbkr. Sounds like I need to take...

Sure enough, nwmtnbkr. Sounds like I need to take this little beastie to Calif DMV and ask them what I need. I gather they will tell me to pay $18, thank you sir and here's your Moped plate and ID...
Forum: Electric Bikes
12-31-09, 04:25 PM
Replies: 6
Views: 3,932
Posted By Little-Acorn

Good catch, nwmtnbkr. Sounds like that's exactly...

Good catch, nwmtnbkr. Sounds like that's exactly the case. I knew it was too good to be true.

Hmmm... wonder what it takes to register this critter. Do I have to call it a "motorcycle"? Turn...
Forum: Electric Bikes
12-31-09, 03:34 PM
Replies: 6
Views: 3,932
Posted By Little-Acorn

California laws on ebikes

Different states have different laws on electric bicycles. Sine I'm in San Diego, I was interested in California's.

Interestingly, I found two different definitions of motorized bicycles, one...
Forum: Electric Bikes
12-30-09, 07:46 PM
Replies: 14
Views: 4,694
Posted By Little-Acorn

Well, did some cleaning up, replaced a connector...

Well, did some cleaning up, replaced a connector for the Hall-effect-sensor wires I had messed up, mounted the WattsUp Meter on the handlebars (ran the high-amperage 12ga drive wires all the way from...
Forum: Electric Bikes
12-30-09, 07:45 PM
Replies: 14
Views: 4,694
Posted By Little-Acorn

Today, Christmas Eve Day, the postman (looking...

Today, Christmas Eve Day, the postman (looking very tired) delivered a heavy package, rather scrunched looking, with Chinese writing all over it. Inside was the 48V 20Ah LiFePO4 battery, a BMS with a...
Forum: Electric Bikes
12-26-09, 12:25 AM
Replies: 5
Views: 3,908
Posted By Little-Acorn

Newmtnbkr, sounds like that VisForVoltage guy had...

Newmtnbkr, sounds like that VisForVoltage guy had a capacitor fail in a shorted condition, and blow a fuse (or more), leaving him with a totally dead charger. Mine still is alive, and for all I know...
Forum: Electric Bikes
12-25-09, 03:02 PM
Replies: 5
Views: 3,908
Posted By Little-Acorn

Does anyone have instructions for Vpower 5-amp LiFePO4 charger?

I got a 48V 20Ah LiFePO4 battery from a chinese company on Ebay, and it came with a Vpower 5-amp 48V charger for LiFePO4. Does anyone have a manual or instruction sheet for this charger?

I think...
Forum: Electric Bikes
12-01-09, 04:12 PM
Replies: 15
Views: 3,462
Posted By Little-Acorn

Crimsonsnake, as nwmtnbkr said, you may be...

Crimsonsnake, as nwmtnbkr said, you may be confusing LiPo batteries with LiFePO4 batteries. LiPo (lithium/polymer) batteries weigh half as much for the power they store, but they are unstable, and...
Forum: Electric Bikes
11-23-09, 05:25 PM
Replies: 15
Views: 1,131
Posted By Little-Acorn

I've heard from other ebikers that the controller...

I've heard from other ebikers that the controller sometimes gets warm or even hot, depending on how agggressive you are on the throttle, how hilly the terrain etc. They recommended that the...
Forum: Electric Bikes
11-19-09, 04:46 PM
Replies: 10
Views: 881
Posted By Little-Acorn

Knock off the first eight words. The rest is just...

Knock off the first eight words. The rest is just fine.

"Here's a place to discuss ebikes, from home grown to high-tech."

Or, if you want it longer, how about, "A vehicle with bicycle...
Forum: Electric Bikes
11-16-09, 05:29 PM
Replies: 11
Views: 3,939
Posted By Little-Acorn

JerseyEbiker, you sound like you have a lot of...

JerseyEbiker, you sound like you have a lot of experience with conhismotor.com. Do you happen to know if they actually manufacture the motors they show on their website, particularly the ones painted...
Forum: Electric Bikes
11-16-09, 02:53 PM
Replies: 14
Views: 4,694
Posted By Little-Acorn

ausGeoff, sounds good. I was wondering if they...

ausGeoff, sounds good. I was wondering if they also improve braking in the rain.

Here in San Diego, I'm not too likely to be riding in the rain. But my wife and I went to China last June, got...
Forum: Electric Bikes
11-16-09, 12:05 AM
Replies: 14
Views: 4,694
Posted By Little-Acorn

I took some pictures of the kit, partially...

I took some pictures of the kit, partially mounted on a Trek 7500.

See them at http://endless-sphere.com/forums/viewtopic.php?f=3&t=14231 .
Forum: Electric Bikes
11-15-09, 12:02 PM
Replies: 14
Views: 4,694
Posted By Little-Acorn

New 48V 1000W rear hubmotor project from daoji at YXM Corp. in China

This may turn into a long, serial thread. I ordered and paid for a 48V, 1000W rear hubmotor from daoji888 of YXM Corp. in China, on Oct. 29. They shipped it on Nov. 5 (700c rims were out of stock,...
Forum: Electric Bikes
11-06-09, 10:46 PM
Replies: 18
Views: 2,948
Posted By Little-Acorn

nwmtnbkr, did that failure in your photo, happen...

nwmtnbkr, did that failure in your photo, happen while a torque arm was being used?

How many such front-wheel-dropout failures have happened with torque arm(s) in use? And how many with no torque...
Forum: Electric Bikes
11-05-09, 06:05 PM
Replies: 23
Views: 7,013
Posted By Little-Acorn

1000watt, great! I can't see the pictures due to...

1000watt, great! I can't see the pictures due to a firewall here at work, but I'll look when I get home. Sounds like you've got it doing what you want, though.

Can you tell me something about the...
Forum: Electric Bikes
11-05-09, 11:44 AM
Replies: 46
Views: 6,241
Posted By Little-Acorn

If you look on Ebay and do a search for 48V 20Ah,...

If you look on Ebay and do a search for 48V 20Ah, a number of LiFePO4 batteries will come up with those ratings. They fall into two groups:

1.) Batteries with a Buy It Now price, where price and...
Forum: Electric Bikes
11-03-09, 04:39 PM
Replies: 8
Views: 1,135
Posted By Little-Acorn

Cerewa, I fully agree. But that extensive...

Cerewa, I fully agree.

But that extensive testing and documentation, is part and parcel of designing and selling a motor to people, or even to a manufacturer who is building e-bikes on a mass...
Forum: Electric Bikes
11-03-09, 10:25 AM
Replies: 8
Views: 1,135
Posted By Little-Acorn

Could be true. But that's what I'm wondering...

Could be true. But that's what I'm wondering about. That's part of the reason for these tests.

At full throttle at least, different motors have their peak efficiency at different RPMs.

The...
Forum: Electric Bikes
11-02-09, 05:53 PM
Replies: 8
Views: 1,135
Posted By Little-Acorn

Suppose your ebike with 750 watt...

Suppose your ebike with 750 watt motor/controller, has a top speed of 25mph on flat ground with wide-open throttle.

If you give it enough throttle to go 15mph on flat ground, how many amps will it...
Forum: Electric Bikes
11-02-09, 05:01 PM
Replies: 8
Views: 1,135
Posted By Little-Acorn

Of course. So what's to prevent them from...

Of course.

So what's to prevent them from doing the following?

1.) With full throttle applied, apply enough brake on the test stand, to slow the motor down to, say, 90% of its unbraked...
Forum: Electric Bikes
11-02-09, 11:18 AM
Replies: 8
Views: 1,135
Posted By Little-Acorn

Performance data for several hub motors, and features from vendors

I was in the market to get a hub motor conversion kit for my Trek 7500, but found it pretty hard to judge in advance how powerful, how fast, how torquey etc. the various hub motors are. I wrote to...
Forum: Electric Bikes
10-26-09, 01:37 PM
Replies: 37
Views: 11,842
Posted By Little-Acorn

One thing I hadn't thought about before: With a...

One thing I hadn't thought about before: With a crank motor, if you use power, your pedals are ALWAYS turning. You cannot coast and let the motor push the bike for you.

I suppose you could put...
Forum: Electric Bikes
10-26-09, 12:48 PM
Replies: 1
Views: 1,572
Posted By Little-Acorn

The charts I've been getting from these...

The charts I've been getting from these companies, don't list Amps, Torque, Efficiency etc. as a function of RPM. Rather, they list Amps, RPM, Efficiency etc. as a function of torque. At first I...
Forum: Bicycle Mechanics
10-25-09, 10:32 PM
Replies: 25
Views: 156,559
Posted By Little-Acorn

Dumb question: Is a 28" wheel the same as a 700c wheel?

Sorry if this is a stupid question. But I occasionally hear a reference to a 28" bicycle wheel. Is this the same as a 700c wheel? (700c wheel diameter is 27.55 inches, maybe someone who doesn't like...
Forum: Electric Bikes
10-25-09, 07:11 PM
Replies: 1
Views: 1,572
Posted By Little-Acorn

Data I've gathered from Hub Motor data sheets

I have asked a number of vendors of hub motors, for data sheets or performance charts on their motors. From those, I have put together a few lists of how much torque a motor produces at full throttle...
Forum: Electric Bikes
10-22-09, 03:45 PM
Replies: 23
Views: 7,013
Posted By Little-Acorn

Ah, got it, crimsonsnake0. Thanks! Those are...

Ah, got it, crimsonsnake0. Thanks! Those are apparently made in the UK, so shipping costs to UK locations is low. But for us poor shlubs in the colonies, it becomes pretty high.

1000watt, I tried...
Forum: Electric Bikes
10-22-09, 02:58 PM
Replies: 23
Views: 7,013
Posted By Little-Acorn

crimsonsnake0, my search of Ebay for...

crimsonsnake0, my search of Ebay for ELETROQUEST123 came up empty. So did a search for ELECTROQUEST123.

Can you give me an Ebay item number or etc.?
Forum: Electric Bikes
10-22-09, 11:39 AM
Replies: 23
Views: 7,013
Posted By Little-Acorn

1000Watt, great! I'm seriously considering that...

1000Watt, great! I'm seriously considering that kit too. My only real problem with it, is that it doesn't come on a 700c wheel for my Trek 7500 hybrid.

Can you tell me a little about the parts?...
Forum: Electric Bikes
10-22-09, 10:05 AM
Replies: 23
Views: 7,013
Posted By Little-Acorn

1000Watt, what's the name of the vendor you...

1000Watt, what's the name of the vendor you bought it from? Are they in China, the U.S., etc.?

Crimsonsnake, what brand of batteries did you get? Do they have a model number?

Inquiring minds...
Forum: Electric Bikes
10-21-09, 10:40 AM
Replies: 4
Views: 1,039
Posted By Little-Acorn

Sounds to me like motors that drive the pedals...

Sounds to me like motors that drive the pedals are more efficient than motors that drive the hub directly. They let you use the bike's gears on hills, letting the motor turn up to its full power (or...
Forum: Electric Bikes
10-18-09, 11:03 PM
Replies: 7
Views: 2,739
Posted By Little-Acorn

BigWheel, it's hard for anyone to tell you what...

BigWheel, it's hard for anyone to tell you what kit to go with, since they don't know your conditions, planned usage, budget, etc. You miht be better off asking questions like, "Has anyone tried the...
Forum: Electric Bikes
10-14-09, 11:16 AM
Replies: 37
Views: 11,842
Posted By Little-Acorn

nwmtnbkr, great reference! Thank you!

nwmtnbkr, great reference! Thank you!
Forum: Electric Bikes
10-13-09, 06:10 PM
Replies: 37
Views: 11,842
Posted By Little-Acorn

Where can I find a crank motor? I'm sold on...

Where can I find a crank motor?

I'm sold on the advantages. Chief among them being, I can shift gears for the motor as well as for my legs. This can keep the motor turning at fairly high speed...
Forum: Commuting
09-10-09, 04:12 PM
Replies: 25
Views: 7,368
Posted By Little-Acorn

I'm in San Diego. What is "wet weather"? ...

I'm in San Diego.

What is "wet weather"?

:)
Forum: Commuting
09-05-09, 09:25 PM
Replies: 25
Views: 7,368
Posted By Little-Acorn

prathmann, that's the kind of thing I'm looking...

prathmann, that's the kind of thing I'm looking or!

downtube42, what kind of problems did you have with it? Zippers stuck, size wrong, ....??

It occurs to me too, that perhaps all I need is a...
Forum: Commuting
09-05-09, 07:38 PM
Replies: 25
Views: 7,368
Posted By Little-Acorn

Backpack that can hang on the side of bike's back rack?

Well, I just got a little miffed, probably should have done more homework. Toured all the LBSs in my area, came home with a set of pannier bags. Big enough, between them, to hold all my 11yr son's...
Showing results 1 to 50 of 163
 
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