Search found 34792 matches

by dogman dan
Jan 17 2020 6:50am
Forum: E-Bike Technical
Topic: Smoked BMSbattery motor
Replies: 5
Views: 165

Re: Smoked BMSbattery motor

FWIW,, you did melt the motor. If the big wires contacted, it could have also damaged the controller. Overload, and then ride up the steep hill, will do in hub motors every time. You have to keep that thing rolling at 15 mph or so, or the motor makes excess heat at lower rpm under that much load. Ty...
by dogman dan
Jan 17 2020 6:23am
Forum: E-Bike Technical
Topic: Battery Recommendations - 2kw
Replies: 6
Views: 204

Re: Battery Recommendations - 2kw

FWIW, if you are getting up that hill, the motor will never draw 2000w, because as it gets rolling, it draws only what it needs, if the need is less than the 35 amps limit on your controller. All you really need, is a good strong battery that can pull 30 amps, without excessive sag under load. Real ...
by dogman dan
Jan 17 2020 6:01am
Forum: E-Bike General Discussion
Topic: MAC motor selection and MAC clutch issues.
Replies: 7
Views: 456

Re: MAC motor selection and MAC clutch issues.

Interesting that the cooling fluid kept it from melting long enough to have mechanical damage. I just keep wishing somebody would make a truly big geared motor. Not a 5000w one, but maybe one able to do 2000w, such as what you gave yours. It would be bigger, heavier, with more copper and magnets so ...
by dogman dan
Jan 17 2020 5:49am
Forum: E-Bike General Discussion
Topic: on-off ignition switch
Replies: 4
Views: 341

Re: on-off ignition switch

Poor contact on the 40 amps fuse, either loose female sockets on the fuse holder, or it could be a fault where the wire attaches to the fuse holder. Could have been the switch though, for similar reasons, the wire to the switch, or the plug leading to the wire to the switch being more likely than th...
by dogman dan
Jan 13 2020 7:21am
Forum: E-Bike General Discussion
Topic: looking for ideas for an Ebike build
Replies: 18
Views: 422

Re: looking for ideas for an Ebike build

Well, what most of us without mo money do, is adapt somewhat to what our bikes can do. The dream persists, but we learn to be happy enough with moderate performance goals. A whole lot of newbs want a lot of speed, and a lot of range at that speed. To start with, range in general equals slower, partl...
by dogman dan
Jan 12 2020 8:52am
Forum: E-Bike Technical
Topic: Where would you place a 72v 25ah battery on this frame?
Replies: 21
Views: 617

Re: Where would you place a 72v 25ah battery on this frame?

Welllllll. I would NOT put 25 ah on that frame. That's a whopper of a battery, and it needs a big ass triangle just for half of it. If I had to do it on that frame, split pack for sure. 72v 10 ah in each pannier bag or box, and if you must carry the other 5 ah, maybe on the bars to help with wheelie...
by dogman dan
Jan 12 2020 8:34am
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 37
Views: 1230

Re: Hub drive torque limitations. Steep hills while towing a child?

Just assuming you need a big battery, if you run 2000w continuous, or it doesn't make it to the top of a rocky mountain pass 10 miles long. Or across a desert 60 miles long. I tended to pack 2000 wh of battery on my high powered, high weight, high drag cargo bike. This means about 25 to 30 pounds of...
by dogman dan
Jan 12 2020 8:22am
Forum: E-Bike General Discussion
Topic: Bafang DPC18 display - battery life - when to charge
Replies: 3
Views: 162

Re: Bafang DPC18 display - battery life - when to charge

Charge to 80% for most rides will be fine, but do charge it to 80% at every convenient opportunity. Don't ride it several days because you can, the battery needs to be charged when it gets below 30% left at least. This will keep it from needing much balancing. Basically, it can be way the heck out o...
by dogman dan
Jan 12 2020 8:06am
Forum: E-Bike General Discussion
Topic: Change from single to triple on front, BB width?
Replies: 4
Views: 135

Re: Change from single to triple on front, BB width?

Try it on the old bb for fit. It should work, while going wider would require a special front derailleur. But I'd be open to the idea of riding it with no derailleur, since shifting the front ring happens so seldom for me. Stop and hand shift the chain to the little ring when you really need it. A w...
by dogman dan
Jan 11 2020 9:28am
Forum: E-Bike Technical
Topic: How do brake interrupt sensors work? (aka brake cutoff sensors)
Replies: 3
Views: 139

Re: How do brake interrupt sensors work? (aka brake cutoff sensors)

Typically, a problem like yours is very simple, but hard sometimes to identify which wire lost connection. Start at the battery, make sure the controller has power, then start looking real hard at all other connectors in the system, and for flaws in wiring. Its not always a wiring issue, just 90% of...
by dogman dan
Jan 11 2020 9:24am
Forum: E-Bike General Discussion
Topic: Moped conversion - 20" rear hub kits
Replies: 2
Views: 178

Re: Moped conversion - 20" rear hub kits

For the steep hills on your property, you need a mid drive. Fat tire may not be needed, that just depends on how deep the mud is, or snow. But most of the season you'd ride anyway, a regular mid drive mtb should suit your needs well. Hub motor will just overheat on the steep, unless its really high ...
by dogman dan
Jan 11 2020 9:17am
Forum: Battery Technology
Topic: Li-Po size limitations
Replies: 4
Views: 193

Re: Li-Po size limitations

Typically, lipo produced for the RC market are about 6 inches long. If this is too long, you may have to look elsewhere for cells.

Typical lifepo4 pouches though, are more square in format.
by dogman dan
Jan 11 2020 9:15am
Forum: Battery Technology
Topic: Modify "dumb" charger to do a storage charge
Replies: 29
Views: 623

Re: Modify "dumb" charger to do a storage charge

Uhhh, you could put a timer on the charger. Lets say you know damn well a full charge takes hours. Set the timer for half that time. Another real easy way, is to charge full, then take a short ride. One mile will take the sting out of full voltage for storage, and take only a few min. Don't even con...
by dogman dan
Jan 11 2020 9:10am
Forum: Battery Technology
Topic: Faster 6s balance charger?
Replies: 43
Views: 794

Re: Faster 6s balance charger?

Lots been said already, but consider this. If you need to balance charge daily, you are hammering your cells into dogshit. So stop that!!! Mostly, this is just a matter of not giving them the big discharge rates when they are getting close to the cliff in the discharge curve. If you must discharge m...
by dogman dan
Jan 11 2020 9:04am
Forum: Battery Technology
Topic: Surplus LiFePO4 packs 4KWH 24V 220AH.
Replies: 8
Views: 278

Re: Surplus LiFePO4 packs 4KWH 24V 220AH.

Not sure I'd even trust lifepo4 parking inside my house now. Powerwall, car, whatever.

But hell yeah, better than what set my house on fire.

To carry in a home brew electric car, a bit bulky, so be good for a truck conversion, or van. Not so hot for a VW bug or geo.
by dogman dan
Jan 09 2020 7:46am
Forum: E-Bike General Discussion
Topic: "BadPowerBikes" LOL: Hate Site or Consumers Fighting Back?
Replies: 14
Views: 573

Re: "BadPowerBikes" LOL: Hate Site or Consumers Fighting Back?

IMO, the big danger of e bikes, hoverboards, or the now popular scooters, is the learning curve of riding them. Hardly a bike retailers fault, but I do believe that shitty pedelec is stupid. People have to break the habit of adjusting the pedals position while stopped for one. It should kick on afte...
by dogman dan
Jan 08 2020 6:58am
Forum: E-Bike Technical
Topic: Motor Doesn't Spin
Replies: 4
Views: 199

Re: Motor Doesn't Spin

I have in the past, tore hair out for days trying to set up a motor and controller. Give up in disgust several times over several days. For some damn reason I'd find reverse, and not be able to make the swap to forward work. Two days later, I find the combo in 5 min. Only one possible explanation, a...
by dogman dan
Jan 08 2020 6:49am
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 37
Views: 1230

Re: Hub drive torque limitations. Steep hills while towing a child?

Other than the effect of just the weight, running a big fast direct drive motor at low speed is quite efficient. So any extra load is pretty minimal, an extra 10 pounds of motor in a 250-300 pound total weight. A bigger motor can mean an extra 15 pounds of battery weight, but still not a very big pe...
by dogman dan
Jan 06 2020 7:56am
Forum: E-Bike General Discussion
Topic: Is my watt meter lying to me?
Replies: 13
Views: 618

Re: Is my watt meter lying to me?

Those are pretty affordable, but at that price, they might not last all that long. I fried mine forgetting that it had a 60v limit, and got a CA so it could handle a 72v battery.
by dogman dan
Jan 05 2020 8:41am
Forum: E-Bike Technical
Topic: connect new controller and throttle to ebike
Replies: 5
Views: 1346

Re: connect new controller and throttle to ebike

Try the plug labeled pedelec. Your controller is not designed for a throttle, but should still work using those wires for throttle.

Ignore the wires to the switch for now. just connect the other three wires, black to black, red to red, and the last wire to the last wire on the pedelec plug.
by dogman dan
Jan 05 2020 8:38am
Forum: E-Bike General Discussion
Topic: Is my watt meter lying to me?
Replies: 13
Views: 618

Re: Is my watt meter lying to me?

One possibility not mentioned here so far, is that you could be wearing out the shunt in your watt meter. I have cooked off a few for my stand alone CA's, and had to replace them. So it could be out of calibration, compared to 6 months ago or whatever if your shunt in the meter is starting to fail, ...
by dogman dan
Jan 05 2020 8:30am
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 37
Views: 1230

Re: Hub drive torque limitations. Steep hills while towing a child?

Mac 6t a spectacularly poor choice for climbing steep hills, unless the rider is very very light. I pound the crap out of a similar motor in 10t wind on fairly steep singletrack, and have never melted one, till I put 400 pounds on it. Riding trail, I weigh out at about 260 pounds, and have found it ...
by dogman dan
Jan 05 2020 8:09am
Forum: E-Bike General Discussion
Topic: Buying Advice - Old High End or New Low End
Replies: 11
Views: 420

Re: Buying Advice - Old High End or New Low End

Small battery won't matter much with your short ride. But batteries age out, rather fast actually. Make sure you can get a new one when you need it. If they don't make them to fit that bike anymore, you got an expensive heavy bike in a year or two. It could be better to put a kit on a 5 speed beach ...
by dogman dan
Jan 04 2020 6:58am
Forum: E-Bike General Discussion
Topic: Hub drive torque limitations. Steep hills while towing a child?
Replies: 37
Views: 1230

Re: Hub drive torque limitations. Steep hills while towing a child?

Re windings,,, pick the winding that suits the speed you plan on riding. So 45 mph,, that's not the low rpm motor. There are different rpm windings for sure, that is a fact. Its a myth that the low rpm winding has more torque. Both winds will have same, or nearly the same torque at 0 rpm and max wat...
by dogman dan
Jan 03 2020 7:09am
Forum: E-Bike General Discussion
Topic: Hub motor misalignment ? safe to install and ride?
Replies: 2
Views: 215

Re: Hub motor misalignment ? safe to install and ride?

Most likely you can dish it back a quarter inch the other way. Loosen all the spokes on the too narrow side 1/4 turn, then tighten the ones on the wide side 1/4 turn. Repeat till its at least closer to center. At some point, you won't be able to tighten the one side anymore, and will have to stop. T...