Search found 34577 matches

by dogman dan
Oct 01 2019 7:05am
Forum: E-Bike General Discussion
Topic: Lower back pain and bikes
Replies: 66
Views: 2682

Re: Lower back pain and bikes

Yep. lots of people think that saddle is for sitting on. Really, its not. How else do those racers sit on that killer saddle for 150 miles a day? They mostly put about 20 pounds of their weight on it, or less. But the days I can pedal like that, are long, long, long gone. Only in the rough dirt do I...
by dogman dan
Oct 01 2019 6:58am
Forum: E-Bike General Discussion
Topic: What E-Bike Rack do you use?
Replies: 5
Views: 206

Re: What E-Bike Rack do you use?

The steel two bike swagman rack, is the cheaper option for carrying ebikes by the wheels. Mine has stood up to a lot of carrying, on rough roads to the single track trails in the national monument in my area. The wheel loops bend for sure on the bad road, but its never actually broken. Once I got th...
by dogman dan
Sep 30 2019 7:21am
Forum: E-Bike General Discussion
Topic: Lower back pain and bikes
Replies: 66
Views: 2682

Re: Lower back pain and bikes

Standing the pedals adds another set of shocks, your legs. As MR was saying, this does not always mean your body is in a coffin straight posture. But only if your nose, knees ( or hips), and feet are in a straight line are you perfectly balanced. This is the mandatory position for skiing as well. Al...
by dogman dan
Sep 30 2019 7:05am
Forum: E-Bike General Discussion
Topic: New Policy Re;E-Bikes in USA National Parks
Replies: 4
Views: 341

Re: New Policy Re;E-Bikes in USA National Parks

So, only class one allowed on walking, biking, horse only trails. Thats too bad. Whatever the rules from Washington may be, Ranger Rick will tell you what he thinks the rules are. Don't expect a message from the boss to get every rangers compliance. But, it Should be legal to ride class one. Disable...
by dogman dan
Sep 30 2019 6:53am
Forum: E-Bike General Discussion
Topic: 60v 30ah brand new battery
Replies: 22
Views: 591

Re: 60v 30ah brand new battery

One thing that makes things simpler, is to stop thinking about amp hours and convert to thinking in watt hours. Amp hours is capacity at a given voltage. Watt hours is amp hours x voltage, the result of the AH calculation. Calculations are guestimates. A real watt meter can measure your real amps lo...
by dogman dan
Sep 30 2019 6:44am
Forum: E-Bike General Discussion
Topic: Speedometer / Odometer 27.5 Inch tires
Replies: 2
Views: 112

Re: Speedometer / Odometer 27.5 Inch tires

Luna might know how to change that. I'd try 28 if you have that possibility. Might be off, but by less, if your tires are on the fat side. A separate, regular cycle computer could be adjusted perfectly to your actual tire size, measured around the outside of the wheel in cm. That would be the best w...
by dogman dan
Sep 30 2019 6:37am
Forum: Battery Technology
Topic: In over my head with an unbalanced 14S5P battery
Replies: 16
Views: 695

Re: In over my head with an unbalanced 14S5P battery

Let me rephrase this simpler. If you were charging to only 80% for a long time, you may have just drove that group 7 out of balance. In fact, your group 7 could be the strong group, NOT the weak one!! It could be low voltage because it has more capacity, not less. This is part of what makes this shi...
by dogman dan
Sep 30 2019 6:18am
Forum: Battery Technology
Topic: In over my head with an unbalanced 14S5P battery
Replies: 16
Views: 695

Re: In over my head with an unbalanced 14S5P battery

You may actually have a low capacity cell in group 7. But its NEVER going to balance charging it to 80%. Your bms doesn't work that way. You have to charge to 100% to get the bms working. I'm not sure how to read that graph, but visually, it looks a lot more balanced than 4.2v vs 3.7v to me. You wil...
by dogman dan
Sep 30 2019 6:04am
Forum: Battery Technology
Topic: CellLog 8S alternatives? Coulometers?
Replies: 8
Views: 640

Re: CellLog 8S alternatives? Coulometers?

I agree, .06v is nothing to worry about. Lots of cheap 6s voltage alarms out there for dirt cheap that can do for just reading voltages good enough. Just don't leave them on the pack all night.
by dogman dan
Sep 30 2019 5:58am
Forum: Battery Technology
Topic: What charger to use for 12S Li-Ion.?
Replies: 15
Views: 401

Re: What charger to use for 12S Li-Ion.?

6s is tricky, its 44v. Lots of 13s, 48v chargers out there, or 14s. But a 12s charger is rare. Looks like you just got a link to one though. 8) What will also work fairly cheap, is better quality 13s charger. One that has a voltage adjustment pot inside it, so you can tweak it down to 12s voltage of...
by dogman dan
Sep 29 2019 8:41am
Forum: E-Bike General Discussion
Topic: Front suspension or steel frame
Replies: 16
Views: 498

Re: Front suspension or steel frame

Well, lets start with buy the bike that fits you the best. That's the really important thing. then make whatever modifications make it fit you better, like longer seatpost and taller bars if you are still too tall on it. Go with a rear motor, or a mid drive, so you can use either bike, with or witho...
by dogman dan
Sep 25 2019 6:15am
Forum: E-Bike General Discussion
Topic: How crazy am I
Replies: 12
Views: 818

Re: How crazy am I

Just carrying a larger battery, will help stiffen your voltage longer into the ride. It might be hard to up the voltage of your bike much without damaging the controller. But if you add another battery in parallel, your initial voltage remains the same, but it won't drop as fast, and you go farther ...
by dogman dan
Sep 25 2019 6:10am
Forum: E-Bike General Discussion
Topic: Fast Ebike for a tough commute
Replies: 57
Views: 2065

Re: Fast Ebike for a tough commute

BBSHD might work real well, if you lose the 40 mph requirement. Nothing wrong with efficiency up hills at 20 mph though, with a larger hub motor. And then on the flat, when needed, a 72v hubbie can still hit 40 mph with ease for that dangerous part of the commute. Like you need to ride in the traffi...
by dogman dan
Sep 25 2019 6:01am
Forum: E-Bike General Discussion
Topic: Who here rides with the Cow Horn style handlebars?
Replies: 28
Views: 703

Re: Who here rides with the Cow Horn style handlebars?

Much depends on your body position. This is greatly affected by the frame type, and how it fits your body. I like the moon/cruiser bars on my cruiser a lot! Riding straight upright on that frame which is long in front, you need the cruiser bar just to reach the bars in an upright position. Put those...
by dogman dan
Sep 25 2019 5:51am
Forum: E-Bike General Discussion
Topic: Baked
Replies: 12
Views: 450

Re: Baked

Yes, dual motors is the other way that works for sure. The main thing is that for the hill you have and the weight load, you need larger magnets, and more copper one way or the other. Then the load will not bog you down so much, and the motor will not go into its wildly inefficient operation rpm. Ho...
by dogman dan
Sep 24 2019 7:11am
Forum: E-Bike General Discussion
Topic: Custom pannier maker?
Replies: 4
Views: 190

Re: Custom pannier maker?

Pelican box?
by dogman dan
Sep 24 2019 7:09am
Forum: E-Bike General Discussion
Topic: Help identifying unlabeled 48v controller wires
Replies: 5
Views: 164

Re: Help identifying unlabeled 48v controller wires

My best guess, it can't run without the lcd. one of those wires to the lcd would be the on off switch on the lcd I think.

But trial and error on those could fry shit. by connecting 48v to a 5v circuit.

My best advice is get a cheap no lcd controller off ebay.
by dogman dan
Sep 24 2019 6:59am
Forum: E-Bike General Discussion
Topic: Baked
Replies: 12
Views: 450

Re: Baked

Yeah, over 300 pounds total weight up a long enough hill can cook one of those. A bike with a 20" wheel might go closer to 400 pounds up a long steep hill. Or, best solution, get a bigger motor, and feed it 2000w up that hill. That should get you up it faster, more efficient, and result in a relativ...
by dogman dan
Sep 19 2019 6:06am
Forum: E-Bike Technical
Topic: Loud clicking noise MAC 12T hub
Replies: 14
Views: 287

Re: Loud clicking noise MAC 12T hub

Sounds like motor stutter. check your wire connections.
by dogman dan
Sep 19 2019 5:58am
Forum: E-Bike Technical
Topic: Solar recharger
Replies: 8
Views: 310

Re: Solar recharger

What voltage are you charging to? 12v ones of low amps suitable for 100w panel are quite cheap. under 10 bucks. https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R10.TR11.TRC1.A0.H0.Xsolar+charge+controller.TRS0&_nkw=solar+charge+controller+10a&_sacat=0 I fail to see why any of t...
by dogman dan
Sep 19 2019 5:54am
Forum: E-Bike Technical
Topic: E-Bikekit control conversion help
Replies: 5
Views: 227

Re: E-Bikekit control conversion help

That's cool. It would be really nice if the industry would just standardize on which color wires solder where on controllers. Then all kits would plug and play, at least on the motor wires end. Dumping the old EBK display and controller is a good idea. The second gen one was better, and the current ...
by dogman dan
Sep 19 2019 5:48am
Forum: E-Bike General Discussion
Topic: rear triangle seat tube
Replies: 35
Views: 783

Re: rear triangle seat tube

Put a rack on the swingarm, likely you have to build it yourself. Then a simple straight chain to drive the left side.
by dogman dan
Sep 19 2019 5:30am
Forum: E-Bike General Discussion
Topic: ebike laws with trike build
Replies: 22
Views: 462

Re: ebike laws with trike build

FWIW, that particular trike kit will be very hard to install two hub motors to. A mid drive will get you low speed power better. You won't break the chain if you stay in low enough gear. All that breakage might be from riding in the wrong gear. A direct drive front hub motor can provide extra power ...
by dogman dan
Sep 19 2019 5:23am
Forum: Battery Technology
Topic: Paralleling LiFe with Li-Ion - How to match the discharge curves?
Replies: 4
Views: 181

Re: Paralleling LiFe with Li-Ion - How to match the discharge curves?

You really can't match those discharge curves. But if you must run that way, run till voltages match, then connect. Run till the A123's are empty, Then STOP. I seriously doubt your GA's are waiting. But current will flow both ways, depending on the needs. Its near impossible to see what is really ha...
by dogman dan
Sep 19 2019 5:13am
Forum: Battery Technology
Topic: Pack too unbalanced for BMS to balance?
Replies: 7
Views: 185

Re: Pack too unbalanced for BMS to balance?

Yes, try to individually charge the low group. It may be that the bms won't let it charge normally.

Replace any bad cells, immediately.