Search found 35402 matches

by dogman dan
May 15 2021 5:45am
Forum: EBike General Discussion
Topic: Beginning Question
Replies: 2
Views: 86

Re: Beginning Question

For the terrain, and the weight, you need a mid drive. Slow speeds, that much weight, and hills can fry hub motors, unless they are moped/motorcycle strength. 2000w on up. Might be better to put each of you on a nice e bike, than try to keep riding the tandem. Low speed balance will continue to be a...
by dogman dan
May 15 2021 5:39am
Forum: EBike General Discussion
Topic: Disaster today, almost set two fires with BBSHD and 52v batteries
Replies: 59
Views: 649

Re: Disaster today, almost set two fires with BBSHD and 52v batteries

Yes, one of the data pins was pack voltage, and caused a short. The batteries should be ok though.

No telling what damage to the display. Pretty good short, possible damage to the controller too, anything possible, such as 48v went down a circuit meant for 5v.
by dogman dan
May 14 2021 6:15am
Forum: EBike General Discussion
Topic: YesComUsa - 36v 750w 24inch Ebike kit
Replies: 14
Views: 309

Re: YesComUsa - 36v 750w 24inch Ebike kit

Occasionally, a 36v controller will have a HVC cutoff, and simply won't turn on on 48v. Highly unlikely that you see that in a controller with 63v caps. 99.9% chance you have a controller that will run fine on 52v, 14s battery just fine. One that charges to 58v or 60v if 16s lifepo4.
by dogman dan
May 12 2021 5:35am
Forum: Bike Mechanical & Structural
Topic: Aluminium Triangle Case build, minimal tools?
Replies: 14
Views: 482

Re: Aluminium Triangle Case build, minimal tools?

The simplest method would be a box made of both wood and metal. I used to do this a lot, since I had some old aluminum signs in my garage when I bought the house. Frame the box with wood, preferably a hardwood. I liked using strips of 1/2 inch thick poplar wood. Then screw the panels to the side. No...
by dogman dan
May 12 2021 5:28am
Forum: Bike Mechanical & Structural
Topic: 20Ah batteries instead of 30Ah?
Replies: 2
Views: 120

Re: 20Ah batteries instead of 30Ah?

Is this lead battery? If so, you need to keep the 30 ah. The smaller battery won't have 1/3 less range, but more than half less. This is because as lead gets smaller, it tends to just use up all the energy heating itself up. A big enough battery stays cool, and leaves more energy for going forward. ...
by dogman dan
May 11 2021 4:35am
Forum: EBike General Discussion
Topic: YesComUsa - 36v 750w 24inch Ebike kit
Replies: 14
Views: 309

Re: YesComUsa - 36v 750w 24inch Ebike kit

The bag is for three lead acid batteries, for a 36v system. Those bags used to come in all kits. Straps to a rear rack, which used to come with the kits too.
by dogman dan
May 10 2021 4:24am
Forum: EBike General Discussion
Topic: is torque a good predictor of how easy it will feel to go uphill?
Replies: 5
Views: 258

Re: is torque a good predictor of how easy it will feel to go uphill?

I demoed the shimano mid drive about 5 years ago at interbike, on a very steep trail. No problem getting up the hill. But it was not riding up it like a motorcycle, it was like riding a bike up a hill. Slow, but little effort needed in the lowest gear. 250w is plenty to go 15 mph, but 20 mph takes 4...
by dogman dan
May 09 2021 5:45am
Forum: EBike General Discussion
Topic: Need select motor.
Replies: 1
Views: 117

Re: Need select motor.

250 will work till the wind blows. When it blows hard, even 350 will slow down, so in general, go with the highest wattage you can afford, and or be legal. Your weight will not be a problem till you have a steep hill, into that 30 mph wind. In the conditions you describe, 250w will easily get you a ...
by dogman dan
May 08 2021 2:09pm
Forum: EBike General Discussion
Topic: source for low capacity 52, 60, or 72v battery?
Replies: 7
Views: 273

Re: source for low capacity 52, 60, or 72v battery?

Time you go lipo, and not the cheap 20 c stuff either. Get some 40c or better, or run at least 10 ah of it. If you are already killing the mower batteries, its not change brand time, its change chemistry time. And maybe, time to forget small packs. 72v 10 ah of stout lipo will do er. And still be fa...
by dogman dan
May 05 2021 6:07am
Forum: EBike General Discussion
Topic: building chopper e-bike
Replies: 7
Views: 243

Re: building chopper e-bike

The mag wheel will be the hard thing to find. But if you can find a spoked wheel motor for 20", a relatively small 500w rated direct drive motor can easily handle 1500w, and in fact I'd go for a 48v 40 amps controller that gives out 2000w peak. Than you should cruise close to 30 mph, and accele...
by dogman dan
May 05 2021 6:01am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 39
Views: 1006

Re: E-bike mid-drive motors hardly outperforms hub motors

I was only considering performance in terms of can it cruise 25 mph, and carry 300 pounds up 10% grade without motor damage. But yeah, gearing could definitely improve acceleration across an intersection. Not that a 500w rated dd running on 1000w from the controller accelerates all that lame. It was...
by dogman dan
May 04 2021 7:37am
Forum: EBike General Discussion
Topic: source for low capacity 52, 60, or 72v battery?
Replies: 7
Views: 273

Re: source for low capacity 52, 60, or 72v battery?

We all want a smaller, lighter, cheaper battery. But I'd watch out for too cheap. Cheap is what burned my garage down, and left me living in a rental for 9 months of hell while the contractor tried his best to rebuild my house without doing all the work I paid him for. RC lipo, of course, you NEVER ...
by dogman dan
May 04 2021 7:33am
Forum: EBike General Discussion
Topic: Replace a BMS in 52v 20 ah battery pack
Replies: 5
Views: 175

Re: Replace a BMS in 52v 20 ah battery pack

This gets complicated and beyond my limited EE knowledge. You can parallel two batteries with same voltage, but different bms', at the discharge wires. But you should un plug, and charge them separately. Then parallel them again to discharge. Or, you can permanently parallel both identical voltage a...
by dogman dan
May 04 2021 7:20am
Forum: EBike General Discussion
Topic: DIY Newb FAQ?
Replies: 4
Views: 218

Re: DIY Newb FAQ?

Not everybody had the time to answer that noobs questions over and over. I did, back when I was sick in bed, waiting to die in 2010. Now I'm recovered and would rather be out riding. And what I know is getting out of date, fast. A really good sticky answering the basic newb questions it a great idea...
by dogman dan
May 04 2021 7:13am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 39
Views: 1006

Re: E-bike mid-drive motors hardly outperforms hub motors

Well, a motor is a motor, and has its performance limits. What I mean is x amount of copper and magnets, in general, delivers y amount of thrust. However, huge differences occur depending on the gearing of a mid drive, or size of a hub wheel, combined with load in the form of grade, weight, and head...
by dogman dan
May 03 2021 5:35pm
Forum: EBike General Discussion
Topic: source for low capacity 52, 60, or 72v battery?
Replies: 7
Views: 273

Re: source for low capacity 52, 60, or 72v battery?

Perhaps a lawnmower battery. Some of them are 48 or 52v these days. The bike might be a bit hard on it though. Nothing affordable about a battery being smaller, it works too hard, then dies early. The other option would be of course, RC lipos, where its at least cheap enough to kill some annually. Y...
by dogman dan
Apr 26 2021 8:15am
Forum: EBike General Discussion
Topic: Rear shock question
Replies: 4
Views: 228

Re: Rear shock question

Try increasing damper some first. If that doesn't tame it, then some more stiffness. But don't stiffen it too much, just what you need for your weight. Personally, I'd rather pedal bounce mildly, than put my lower back through too stiff a shock. But for sure, stiffen up till you don't bottom out any...
by dogman dan
Apr 22 2021 5:54am
Forum: EBike General Discussion
Topic: Putting together a starter e-handcycle, know nothing about bikes
Replies: 16
Views: 504

Re: Putting together a starter e-handcycle, know nothing about bikes

Cant find the Utah company, I remember them from about 5 years ago. I did find this. http://www.freedomryder.com/?gclid=EAIaIQobChMI1dP1kdeR8AIVzuDICh1RJQK0EAMYASAAEgLRF_D_BwE And you might consider the PA company. I used to actually work for them, before I retired. You don't have to pedal most regu...
by dogman dan
Apr 22 2021 5:44am
Forum: EBike General Discussion
Topic: Putting together a starter e-handcycle, know nothing about bikes
Replies: 16
Views: 504

Re: Putting together a starter e-handcycle, know nothing about bikes

Good that you included the link, but your choice is not the easiest to convert. This is because you would not have brakes that apply by pedaling back on any hub motor kit I know of. Some modifications could be made to have the motor do some braking, but I would definitely still want mechanical brake...
by dogman dan
Apr 20 2021 6:00am
Forum: EBike General Discussion
Topic: What motor windings would you go with?
Replies: 21
Views: 512

Re: What motor windings would you go with?

You need to choose the motor that goes the speed you want. From your specs of battery voltage and controller, it sounds like you want a homemade electric motorcycle. So go with the fast winding, or get a gas motorcycle. If you want more torque, then your choice of wheel size based on looks is dead w...
by dogman dan
Apr 19 2021 6:58am
Forum: EBike General Discussion
Topic: Looking to build an eBike
Replies: 12
Views: 464

Re: Looking to build an eBike

This is why I read ES still after 12 years. For amusement. He's going to lose weight, riding 5 miles, at 40 mph. Okey dokey. It will work if he rides 100 miles on the weekend. I'm assuming no 1000 foot vertical climb either way. Honestly, he needs to keep riding the pedal bike to work, or with a low...
by dogman dan
Apr 19 2021 6:50am
Forum: EBike General Discussion
Topic: Any way to verify AH on a battery?
Replies: 12
Views: 515

Re: Any way to verify AH on a battery?

Same picture, if you select 13 ah, or 24 ah. So that picture is the 13 ah, for certain sure. If you select 24 ah, you will get a square pack wrapped in cardboard and duct tape. It will be a huge box, with cheap ass cells inside.

The kind that burns your house down. Or at least burned my house.
by dogman dan
Apr 19 2021 6:38am
Forum: EBike Technical
Topic: New bike build hill climbing
Replies: 7
Views: 965

Re: New bike build hill climbing

Less weight of lead will help of course. But the real problem is likely to be that your lead sags under max load too much to have enough power. So you aren't getting that 2000w when you need it most. You'd need 30 ah of lead, way too heavy to carry around, to limit sag with hills that steep. A good ...
by dogman dan
Apr 19 2021 6:35am
Forum: EBike Technical
Topic: best shock type for rear hubs?
Replies: 12
Views: 305

Re: best shock type for rear hubs?

The operative word here on what he has now is cheap. Better shock, of either type, will be,,,, wait for it,,,, Better. In general, he just needs a better shock of any type. I came to like my air rear shock simply because I could stiffen it up more than the spring shocks I have. Both were decent shoc...
by dogman dan
Apr 19 2021 6:13am
Forum: EBike Technical
Topic: Modifying a Hub Motor
Replies: 55
Views: 1623

Re: Modifying a Hub Motor

Ok, what you have is a motor that in general, tolerates up to 2000w pretty well. What likely happened is you ran 18s lipo, which is 60v through a 48v controller. full charged, about 72v went through the capacitors in your controller, which are typically 63v capacitors. So what you want now, is a 60v...