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by dogman dan
Feb 17 2020 8:17am
Forum: E-Bike General Discussion
Topic: 40k flat commute @ 40k/hr, Direct Drive or Geared?
Replies: 4
Views: 109

Re: 40k flat commute @ 40k/hr, Direct Drive or Geared?

DD, not so much for durability though, but for the quieter operation at speeds above 15 mph. At 40 kph/25 mph, a geared hub can get just a bit noisy, especially later on after it slings some of the grease off the gear surfaces. Not a lot of hills to coast down, so the better coasting of the geared h...
by dogman dan
Feb 16 2020 8:41am
Forum: E-Bike General Discussion
Topic: Advice for a kit for a specific route
Replies: 9
Views: 185

Re: Advice for a kit for a specific route

Yeah, you always want more speed and power pretty quick, So I rarely advise for 36v systems. Nothing wrong with a mid drive!! I just wanted to point out that I climbed a very similar length and grade hill commuting in a hot desert for years, and never melted a motor commuting, except for a very poor...
by dogman dan
Feb 16 2020 8:34am
Forum: E-Bike General Discussion
Topic: Ut Oh Cooked Another
Replies: 34
Views: 582

Re: Ut Oh Cooked Another

Thanks for the clarification, hot day, ride around till the motor is at a pretty hot equilibrium temp, then run it up a steep hill. It (the big muxus) didn't melt in 20 min riding. It did take a while. The problem is mostly the load up that hill, but starting up it already hot was the last straw for...
by dogman dan
Feb 15 2020 8:58am
Forum: E-Bike General Discussion
Topic: Advice for a kit for a specific route
Replies: 9
Views: 185

Re: Advice for a kit for a specific route

Still less than 500 feet of vertical in one mile. Not saying that's not a hell of a hill, but its going to be easily slayed by most motor kits over 500 watts. I would say, go with a kit that has a 500w rated motor, with 48v battery. That's a 1000w setup, which should have you going back up that hill...
by dogman dan
Feb 15 2020 8:50am
Forum: E-Bike General Discussion
Topic: Ut Oh Cooked Another
Replies: 34
Views: 582

Re: Ut Oh Cooked Another

Not surprised by a few of those roasts, but you'd think the big muxus would have lasted, even on 72v 40 amps. I got kind of tired of roasting motors, which I did pretty often when I ran 72v. That 3000w power was nice, but I only got away with it in the cold winter weather. Best advice so far, going ...
by dogman dan
Feb 14 2020 9:21am
Forum: E-Bike Technical
Topic: Please review this before I place an order
Replies: 4
Views: 181

Re: Please review this before I place an order

Mid drive it would be better. especially if the weight gets really big. Not that you can't do a heavy rig up hills with a hub. But a strong mid drive will be better. DO NOT pick the fast wind for a trailer hauling hub motor. You want the slower wind. Because all that weight will have you going slowe...
by dogman dan
Feb 14 2020 9:18am
Forum: E-Bike Technical
Topic: New E Fat bike build help!
Replies: 6
Views: 316

Re: New E Fat bike build help!

Fat bike tires are NOT for 40 mph. Go with a big fat tire on an MTB.
by dogman dan
Feb 14 2020 9:16am
Forum: E-Bike General Discussion
Topic: Small hub motor
Replies: 20
Views: 1699

Re: Small hub motor

FWIW, I was an off and on rider too for years. A few weeks after I got an e bike, I was riding with power 99% of the time, and commuting 15 miles one way to work. a year of that, and I was riding pretty long distances on mountain bikes, on very tough trails. Start small very good. Keep it cheap. But...
by dogman dan
Feb 14 2020 9:05am
Forum: E-Bike General Discussion
Topic: The joy of causing despair and confusion
Replies: 15
Views: 474

Re: The joy of causing despair and confusion

Love it. Looks like my old death race vid, except you don't just kill em on the start, but in the straight as well. You can see the guy looking at your shit, going wtf? Then, see ya. Re stealth, my cruiser is very much not obviously an e bike. But as faster guys training for a race pass me, they cle...
by dogman dan
Feb 14 2020 8:59am
Forum: General Discussion
Topic: Lipo vs Lion
Replies: 27
Views: 538

Re: Lipo vs Lion

For sure, a much smaller, higher c rate, lipo pack can provide 3000w of power. Though the cells in other packs have improved, you still don't go pulling really high amps from a 10 ah size pack. In general, if you want light weight, to keep the handling of a bike good off road, you need the higher c ...
by dogman dan
Feb 14 2020 8:51am
Forum: Battery Technology
Topic: Re-purposing some laptop cells for ebike pack
Replies: 2
Views: 96

Re: Re-purposing some laptop cells for ebike pack

Disassemble without removing the strip attached to the tabs. So you still have a strip you can solder to.

Charge em, test em. Then make parallel sections that are big enough to discharge without huge voltage sag under load.
by dogman dan
Feb 12 2020 9:42am
Forum: E-Bike Technical
Topic: Problem with phasewire heat shrink :(
Replies: 8
Views: 235

Re: Problem with phasewire heat shrink :(

Oh,, I thought the wire should look brighter. In the picture it looks dull to me, which I have seen on roasted wires.
by dogman dan
Feb 12 2020 9:33am
Forum: E-Bike General Discussion
Topic: Heinzmann 36v 750w controller & battery
Replies: 2
Views: 105

Re: Heinzmann 36v 750w controller & battery

Same answer, except it could be from ebay instead of amazon.. Right now though, I would look for a controller already in the usa, vs shipped from china. Partly the virus, but also its Chinese new year over there. Those motors melt easy when overloaded, so I would limit to 20 amps, so you will get a ...
by dogman dan
Feb 12 2020 9:28am
Forum: Battery Technology
Topic: 7s15p or 3*7s5p to quickly charge?
Replies: 19
Views: 325

Re: 7s15p or 3*7s5p to quickly charge?

15p,, one good charger,, one bms able to handle the big chargers output. That's ideal. What I mean is,,, changing the p number does not change the individual cells recommended max charge rate. So 3p x max rate of each cell is not going to increase the cells max rate. But depending on which bms you u...
by dogman dan
Feb 11 2020 7:55am
Forum: E-Bike Technical
Topic: Problem with phasewire heat shrink :(
Replies: 8
Views: 235

Re: Problem with phasewire heat shrink :(

Wire looks cooked off to me, will resist a lot, and cook off again. Replace that wire. But if that wire cooked off that hot,, what did it do to the windings?

That motor is done carrying much wattage IMO. It got overloaded?
by dogman dan
Feb 11 2020 7:05am
Forum: General Discussion
Topic: What powerful rear geared hub motor?
Replies: 10
Views: 1096

Re: What powerful rear geared hub motor?

Again, nothing will do everything. But your commute needs are very modest. That opens up some possibilities. Maybe one bike, but two battery setups? You can still ride dirt with a lot of powerful battery, but run your very short commute on less power, meaning a nice small battery can get you there a...
by dogman dan
Feb 10 2020 7:18am
Forum: E-Bike General Discussion
Topic: Fat Bike vs (Hardtail)-MTB
Replies: 7
Views: 348

Re: Fat Bike vs (Hardtail)-MTB

Yeah,,,, you want it. And it does exist. In a gas motorcycle. I mean fast on road, pretty nimble suspension for off road. Perfect, except in many places riding that motorcycle on a bike trail is very illegal. The only real solution is to throw money at the problem, which is a real problem when there...
by dogman dan
Feb 10 2020 6:59am
Forum: General Discussion
Topic: What powerful rear geared hub motor?
Replies: 10
Views: 1096

Re: What powerful rear geared hub motor?

That should work, particularly since in a 12t winding, the motor will reach middle rpm where the motor stops running so inefficient a few seconds sooner than a fast winding would have. As the motor winds up to speed, it will stop trying to pull the full amps, effectively limiting excess motor heatin...
by dogman dan
Feb 10 2020 6:46am
Forum: General Discussion
Topic: China (virus): no problem with air shipments? i'd like to buy.........
Replies: 45
Views: 1293

Re: China (virus): no problem with air shipments? i'd like to buy.........

Just ordered a new pair of eyeglasses. Turns out I can't opt for a quicker shipping at this time, up to 30 days to arrive at my house. Assuming somebody shows up to ship em. Guess I should have known the lenses came straight from china. The box is mailed from a US address, but the actual item of cou...
by dogman dan
Feb 07 2020 9:09am
Forum: E-Bike General Discussion
Topic: questions about mini-hub for a child
Replies: 6
Views: 206

Re: questions about mini-hub for a child

For a child, I'd do two things after choosing a low power mid drive. 1 remove all but the smallest front chainring. This will protect the motor, by insuring it will not be run in the wrong, very high, gear on a steep hill. Even a 350 watt will not overheat if its simply in the correct lower gears fo...
by dogman dan
Feb 05 2020 7:49am
Forum: E-Bike Technical
Topic: Battery pack made from several small modem packs.
Replies: 32
Views: 811

Re: Battery pack made from several small modem packs.

Pretty much what I keep saying,, they will work fine in a 50 ah pack. But 50 ah is a lot of battery to carry on a normal bike. Maybe you are doing something else? but this is the bike section, sooo… I did build a custom frame that could easily carry 80 ah, but that does not mean it was going to ride...
by dogman dan
Feb 05 2020 7:39am
Forum: E-Bike General Discussion
Topic: Power cuts off because of cold weather?
Replies: 11
Views: 262

Re: Power cuts off because of cold weather?

Cold enough can do that. If the battery actually freezes, its also very harmful to try to use it. So you gotta do something, to keep it warmer while you work. You must keep it above freezing. If its cold, but still not froze, it will still perform very poorly, till it uses up enough of its power in ...
by dogman dan
Feb 05 2020 7:35am
Forum: General Discussion
Topic: Northern Lights Visible
Replies: 12
Views: 1041

Re: Northern Lights Visible

I used to see it in Idaho, when we spent summers there as a kid. They are very beautiful. Stars were great there too, we were way out in the sticks, off grid, so very low light pollution there. No seeing it here on the Mexican border last night. it was snowing. Last gasp of winter for us last night.
by dogman dan
Feb 05 2020 7:30am
Forum: General Discussion
Topic: China (virus): no problem with air shipments? i'd like to buy.........
Replies: 45
Views: 1293

Re: China (virus): no problem with air shipments? i'd like to buy.........

Could be a bad year for ship from china. Boat ship still works of course, but that requires the factory, warehouse, and or shipping personnel to be showing up at work. Package on boat will have tons of time for the virus to die if the item is contaminated. On the bright side, flu season does end in ...
by dogman dan
Feb 02 2020 9:41am
Forum: E-Bike Technical
Topic: Battery pack made from several small modem packs.
Replies: 32
Views: 811

Re: Battery pack made from several small modem packs.

What I was trying to say as well. they are the wrong cells when new, and now they are at least aged, if not used, if not used up. Go for it if you want, but be expecting spectacularly poor results, after a lot of hard work. Throttle can limit amps,, don't be surprised when the system shuts itself do...