Search found 33989 matches

by dogman dan
Feb 22, 2018 7:46 am
Forum: E-Bike General Discussion
Topic: Most efficient end-to-end pedal generator?
Replies: 1
Views: 36

Re: Most efficient end-to-end pedal generator?

I can't really help with the hook up, but for sure your bike hub motor will make a decent, efficient, generator.

Others have produced the same thing commercially using a basic direct drive rear hub motor.

Use the power to keep a cheap lead 12v battery full.
by dogman dan
Feb 22, 2018 7:41 am
Forum: E-Bike General Discussion
Topic: Omnium cargo e-bike conversion what to choose?
Replies: 4
Views: 175

Re: Omnium cargo e-bike conversion what to choose?

This one calls for a mid drive, in my opinion. 350w bafang would be good. If any wattage labels appear, just remove them. The other solution would be a rear direct drive motor, in the slowest wind model you can find. However, to realistically carry large weights, a DD would need more power, like 100...
by dogman dan
Feb 22, 2018 7:36 am
Forum: E-Bike General Discussion
Topic: Zip Tie Failure
Replies: 9
Views: 183

Re: Zip Tie Failure

2" wide Velcro can hold a lot of weight, not a bad idea.

Make your own huge hose clamp from the plumbing strap is also a good idea, cheap way to go.
by dogman dan
Feb 22, 2018 7:33 am
Forum: E-Bike General Discussion
Topic: Cheap high rate 24V pack?
Replies: 4
Views: 74

Re: Cheap high rate 24V pack?

30 amps from that pack would be 1.5c discharge rate, so that is a plausible solution.
by dogman dan
Feb 21, 2018 7:50 am
Forum: E-Bike General Discussion
Topic: Looking for a chromoly rear rack, any suggestions?
Replies: 13
Views: 297

Re: Looking for a chromoly rear rack, any suggestions?

That one does look good, compared to the one with the bends in the legs.
by dogman dan
Feb 21, 2018 7:45 am
Forum: E-Bike General Discussion
Topic: Zip Tie Failure
Replies: 9
Views: 183

Re: Zip Tie Failure

Zip tie to secure batteries does equal failure. Time to upgrade to hose clamps, the big ones intended for securing flex duct. There are also mondo zip ties they use for the same thing. A real battery box would be an even better idea. I'd rather use doubled up baling wire for securing anything heavie...
by dogman dan
Feb 20, 2018 8:40 am
Forum: E-Bike General Discussion
Topic: Looking for "new" used bike for electric conversion
Replies: 9
Views: 283

Re: Looking for "new" used bike for electric conversion

I agree, the trek 820, or similar bike better for a commuter than nearly any MTB sold at Walmart. My first year commuting I got about 6 months from each walbike I got hold of. The frames die. Which is why I suggested a 7 speed cruiser, if you are buying a Walmart bike in the sub 200 bucks category. ...
by dogman dan
Feb 20, 2018 8:29 am
Forum: E-Bike General Discussion
Topic: Is my frame in danger ?
Replies: 5
Views: 184

Re: Is my frame in danger ?

As others have implied, you could easily install even two torque arms, and then have the motor spit out and ruin the frame. Its all in the details of the install. Step one for me is always to file the dropout deeper, so the center of the new motor axle is in the same place as the center of the old 1...
by dogman dan
Feb 20, 2018 8:21 am
Forum: Battery Technology
Topic: cell imbalance in new hobby king lipo pack
Replies: 8
Views: 241

Re: cell imbalance in new hobby king lipo pack

Again, only if you have self discharge that continues after the first 24 hours, do you have anything other than a normal, cheap ass hobby king cell. Brand new, or after just a few cycles, holding at 4.18v overnight is a damn good cell!!! My general experience is that a typical cell charges to 4.2v, ...
by dogman dan
Feb 20, 2018 8:07 am
Forum: Battery Technology
Topic: Voltage drop with acceleration
Replies: 7
Views: 309

Re: Voltage drop with acceleration

800 milliohms resistance would be utterly useless. Those were dead cells to begin with. Testing cells first, especially recycled ones, is worth the effort. I bought some A123 round cells from a guy once, said to be good as new, but not factory fresh. Assembled into a pack, they sagged so much they i...
by dogman dan
Feb 19, 2018 8:34 am
Forum: E-Bike General Discussion
Topic: Looking for "new" used bike for electric conversion
Replies: 9
Views: 283

Re: Looking for "new" used bike for electric conversion

Might look into new, for a 7 speed beach cruiser. You'd be surprised how good a commuter they can be. Fenders are nice! and so is a welded on rear rack that is really sturdy. The margaritaville has the rack, but more room for battery in this one. https://www.walmart.com/ip/26-Men-s-BCA-Charleston-Cr...
by dogman dan
Feb 19, 2018 8:31 am
Forum: E-Bike General Discussion
Topic: Looking for a chromoly rear rack, any suggestions?
Replies: 13
Views: 297

Re: Looking for a chromoly rear rack, any suggestions?

Agreed. If nothing else, the mounting points are the weak link in bolt on racks, if not seriously reinforced with heavy gussets, or some how overbuilt. However, I would rate the welded on mild steel rack on that huffy at 150kg, even though the cheap wheel would die quickly. Modifications to existing...
by dogman dan
Feb 19, 2018 8:18 am
Forum: E-Bike General Discussion
Topic: First DIY Build - input needed (I read the FAQ!)
Replies: 21
Views: 255

Re: First DIY Build - input needed (I read the FAQ!)

20 ah, and a 500w rated geared hub kit. (but run at 48v, for 1000w of hill climbing power) Coasting down the hills will be much faster than cranking out regen, and the motor will handle hills better, up to their 300 pound total weight limits. Lighter wheel will help, since that battery will be prett...
by dogman dan
Feb 19, 2018 8:02 am
Forum: General Discussion
Topic: Perth bike path speed bump trial set to force speeding cyclists to slow down
Replies: 9
Views: 125

Re: Perth bike path speed bump trial set to force speeding cyclists to slow down

Betcha some of the walkers "in danger" walk three or four abreast on that path refusing to leave space for a pass. Make the path wider is the real solution, combined with some patrolling to curb the truly rude bike riders. 3 meters wide foot wide should be the standard, not 2. Better still, a fine g...
by dogman dan
Feb 17, 2018 11:58 am
Forum: E-Bike General Discussion
Topic: Critique my Build/Plan
Replies: 23
Views: 459

Re: Critique my Build/Plan

It will be fun, I won't deny that!

I wasn't talking fun budget, I was talking transportation budget. Fun budget can afford a six pack of 9 speed chains.
by dogman dan
Feb 17, 2018 11:56 am
Forum: E-Bike General Discussion
Topic: Stealth & quick-ish e-bike for short commute, opinions
Replies: 20
Views: 585

Re: Stealth & quick-ish e-bike for short commute, opinions

Rear hub on a 7 speed beach cruiser with a built in rear rack. hide the motor under pannier bags. Throw oil on it and ride it on the dirt, and then don't wash it. Or paint it with a brush. It won't look worth cutting the lock on it. 48v 1000w kit will go 25 mph cruise the whole ride. One battery of ...
by dogman dan
Feb 17, 2018 11:51 am
Forum: E-Bike General Discussion
Topic: Looking for a chromoly rear rack, any suggestions?
Replies: 13
Views: 297

Re: Looking for a chromoly rear rack, any suggestions?

huffy.jpg
huffy.jpg (39.05 KiB) Viewed 204 times
by dogman dan
Feb 17, 2018 11:46 am
Forum: Battery Technology
Topic: Would you charge a 4s LiFePo with a "15V" wall wart (intended for charging a 12V SLA)?
Replies: 11
Views: 180

Re: Would you charge a 4s LiFePo with a "15V" wall wart (intended for charging a 12V SLA)?

Because the charger trickles, no. Unless it does have a reliable bms.

Good excuse to buy a 50w RC charger IMO, like a b6
by dogman dan
Feb 17, 2018 11:40 am
Forum: General Discussion
Topic: Heavy duty wheels for 26" MTB with BBSHD
Replies: 3
Views: 117

Re: Heavy duty wheels for 26" MTB with BBSHD

Might look at some wheels intended for cargo bikes. Not the lightest racing wheel you find in the mtbs stuff, but not steel heavy. Generally the nipples will have the eyelets. Something similar to the alex, if you cant find them.
by dogman dan
Feb 17, 2018 11:30 am
Forum: General Discussion
Topic: Pain in the neck and back, wrong frame size?
Replies: 8
Views: 214

Re: Pain in the neck and back, wrong frame size?

True enough, a back sweeping bar will be a lot better than a bmx bar. But I find riding with them tilted far enough up to clear my knees uncomfortable too. This tilt will be needed if hes on a kid size bike, like a Walmart mtb. Once he gets a frame the size he needs, then cruiser bars would be even ...
by dogman dan
Feb 17, 2018 11:26 am
Forum: General Discussion
Topic: Close encounter.......
Replies: 16
Views: 771

Re: Close encounter.......

Re the corner gone bad, No way you could have seen that car,, but obviously you need to stay in your lane. Just part of the learning curve, if you never rode motorcycles before. Your e bike is not the same as when you pedaled. You will find yourself cornering faster than you used to, as if you were ...
by dogman dan
Feb 15, 2018 7:37 am
Forum: E-Bike Technical
Topic: How does ebike throttle work? (was Re: Welcome Message to New Members)
Replies: 2
Views: 104

Re: How does ebike throttle work? (was Re: Welcome Message to New Members)

For other good tech info, try reading the tutorials on the Grin Technology website. Good explanations of all the parts of an ebike.
by dogman dan
Feb 15, 2018 7:35 am
Forum: E-Bike Technical
Topic: Enabling regenerative braking on eBay hub kit
Replies: 24
Views: 708

Re: Enabling regenerative braking on eBay hub kit

The photo was fine, good clear pic.

I, and the others here just needed it pointed out where you soldered. It could be different on other controllers of course. I just had a hard time spotting it at first.
by dogman dan
Feb 15, 2018 7:32 am
Forum: Battery Technology
Topic: cell imbalance in new hobby king lipo pack
Replies: 8
Views: 241

Re: cell imbalance in new hobby king lipo pack

It is a bad sign, which is why you want to check it out with a cycle or two to get it fully full and balanced, then see how the cell behaves. There will be inbalance of some degree, that shows when the pack is fully empty, at 3.5v or lower. At 3/6v and above, it should do better. BTW,, I call anythi...
by dogman dan
Feb 15, 2018 7:28 am
Forum: E-Bike Technical
Topic: Hall sensor issue or Mofsets dying ?
Replies: 2
Views: 207

Re: Hall sensor issue or Mofsets dying ?

Looks like everybody missed it.

Classic symptoms of a bad connection on the halls circuits. because it runs, but badly, one of the r g y wires.