Search found 33995 matches

by dogman dan
Feb 24, 2018 8:29 am
Forum: Battery Technology
Topic: greasy orange dirt
Replies: 7
Views: 120

Re: greasy orange dirt

Yeah, its a leaker.
by dogman dan
Feb 24, 2018 8:22 am
Forum: General Discussion
Topic: Small Solar Proposal
Replies: 18
Views: 157

Re: Small Solar Proposal

Starting point on your math is the output of the panels. Potential max output matters not, since it might be cloudy on race day. Even just thin high clouds have a huge impact. So its not 300w x 18 hours. 300w of panel, figure if you are lucky, you get 1500 watt hours per day. Could be less though, o...
by dogman dan
Feb 23, 2018 8:16 am
Forum: E-Bike Technical
Topic: Help Identifying Controller Wiring
Replies: 6
Views: 100

Re: Help Identifying Controller Wiring

What he said. You might find one of the three wire plugs is brakes. one common hot, two separate returns from the handles. The other might be a three speed switch. The two wire might be on off, or it might be a high power, low power jumper. a jumper usually has the same color both wires. So on off i...
by dogman dan
Feb 23, 2018 8:10 am
Forum: E-Bike General Discussion
Topic: Most efficient end-to-end pedal generator?
Replies: 6
Views: 169

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

By all means, use the battery you got. I just meant use something, so it can buffer out all the variations in voltage and or amps. Lead cheap if you had nothing. You can input to the battery variably, but pull smooth power from the battery as needed, up to your ability to pedal it back in.
by dogman dan
Feb 23, 2018 8:00 am
Forum: E-Bike General Discussion
Topic: Catastrophic Fork Dropout Crack - Torque Arm Saves the Day
Replies: 21
Views: 374

Re: Catastrophic Fork Dropout Crack - Torque Arm Saves the Day

Yeah, I agree, the crack was caused by a bit of slack in the fit of the torque arm. It may have been tight when new, but worked a groove into the axle, or the ta itself smudged a bit and got slack. At some point in time, you may have ridden with slightly loose nuts on the thing, allowing enough rota...
by dogman dan
Feb 23, 2018 7:49 am
Forum: Battery Technology
Topic: 30Q - 6p build... bike range disappointing - IDEAS?
Replies: 20
Views: 359

Re: 30Q - 6p build... bike range disappointing - IDEAS?

All any of us can do with the above information is guess. But my guess would be resistance is higher at the contacts in the no weld pack. But just one defective cell in the pack would also do the trick nicely. What I mean by guessing, is that nobody knows the actual real world capacity of any of the...
by dogman dan
Feb 22, 2018 7:46 am
Forum: E-Bike General Discussion
Topic: Most efficient end-to-end pedal generator?
Replies: 6
Views: 169

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: 219

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: 16
Views: 349

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: 11
Views: 210

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: 331

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: 16
Views: 349

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: 317

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: 228

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: 268

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: 337

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: 317

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: 331

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: 282

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: 145

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: 480

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: 628

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: 331

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

huffy.jpg
huffy.jpg (39.05 KiB) Viewed 238 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: 22
Views: 276

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: 4
Views: 149

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.