Search found 654 matches
- Oct 29 2015 7:57pm
- Forum: Stand-up E-scooters and E-skateboards
- Topic: e twow mods
- Replies: 5
- Views: 1829
Re: e twow mods
Have you tried kicking? I have a similar 36V scooter and the motor doesn't quite have the torque to go up steep hills quickly but kicking helps it immensely, just like pedaling a lower-powered e-bike helps it accelerate and go uphill.
- Oct 19 2010 6:07pm
- Forum: General Discussion
- Topic: Weird electrical noise issue
- Replies: 0
- Views: 338
Weird electrical noise issue
Since there are many electrical engineers (professional or hobby) here, maybe someone here can figure out a strange problem I have with a new amplifier I bought. When riding my motorcycle I stream music through Bluetooth to a receiver attached to my helmet, which outputs to a tiny amplifier which in...
- Dec 18 2009 10:54pm
- Forum: EBike Technical
- Topic: I want train-approaching-station alternating lights!
- Replies: 7
- Views: 1209
Re: I want train-approaching-station alternating lights!
Conventional flashers flash from the current being drawn by the bulb heating a litte Bi-metal strip which flexes away opening the circuit after a moment of the light being on, then cooling and closing the circuit again. This requires matching the currrent draw which the flasher was designed to see ...
- Dec 18 2009 6:45pm
- Forum: EBike Technical
- Topic: I want train-approaching-station alternating lights!
- Replies: 7
- Views: 1209
Re: I want train-approaching-station alternating lights!
My primitive caveman brain is having trouble with that 'simple' circuit. Here's a crude illustration I came up with. This uses a DPDT toggle switch but I'm only using three of its four output poles. The timer is represented as a SPDT switch because that's what I'd like it to function as. This drawin...
- Dec 18 2009 6:20pm
- Forum: EBike Technical
- Topic: I want train-approaching-station alternating lights!
- Replies: 7
- Views: 1209
I want train-approaching-station alternating lights!
This is an embarrassingly simple question because I'm so inept at electronics, but given two lights that each have a ground and a +12V input, can someone help me figure out what circuit would allow them to, at the flip of a SPDT switch, alternate between left and right? Specifically the left light s...
- Apr 15 2009 11:54am
- Forum: Battery Technology
- Topic: A123 Pack building...
- Replies: 6
- Views: 1308
Re: A123 Pack building...
I asked this question a month or two ago and was told it would be extremely difficult to solder to the sheet because it'll conduct the heat away too well. If you really want the best possible connection, you can attempt spot-welding.
- Apr 07 2009 11:01pm
- Forum: Battery Technology
- Topic: Chrysler & A123Systems agree-A123 prismatic 20Ah cell IMAGE!
- Replies: 16
- Views: 5204
Re: Chrysler & A123Systems agree-A123 prismatic 20Ah cell IMAGE!
The last paragraph is key: mild hybrid conversions of existing models. Yawn. Doomed to failure.
- Apr 06 2009 11:31am
- Forum: Battery Technology
- Topic: The care and feeding of a123-based packs...
- Replies: 548
- Views: 122871
Re: The care and feeding of a123-based packs...
The cells in the 8-cell pack are 18mm diameter, not 26mm diameter. They're 18650 cells and are only 1.1 Ah. So you can't use those end caps for the 26650 cells. 10s3p can be done with the original plastic holders, by taking three 10s packs and running 11 insulated wires between them to connect the c...
- Mar 30 2009 4:55pm
- Forum: Battery Technology
- Topic: ===== All LiFePO4 cells compare Database =====
- Replies: 9
- Views: 1097
Re: ===== All LiFePO4 cells compare Database =====
It says A123s explode if exposed to flames, not if crushed. There have already been tests where they've been drilled into, hammered, etc., and been safe. I don't know if anyone here has tried lighting them on fire. Of course this is a nearly impossible circumstance. Regarding Headways, they're right...
- Mar 27 2009 9:42pm
- Forum: E-Vehicles General Discussion
- Topic: Top Gear British TV Show Faked Tesla Battery Failure
- Replies: 10
- Views: 1084
Re: Top Gear British TV Show Faked Tesla Battery Failure
That segment was aired months ago and this has already been discussed to death. The first time, they ran the car til it was fairly low, but not 'empty', and the car automatically impaired its performance at that point to run efficiently, so they couldn't continue racing on the track until they charg...
- Mar 27 2009 4:18pm
- Forum: Battery Technology
- Topic: LiPo battery care and basic information
- Replies: 272
- Views: 91513
Re: LiPo battery care and basic information
I know very little about electronics, but if I were using lithium-polymer, I would want a circuit applied to each bank of cells that cuts off power if they get too low or too high, designed in a way that more than one circuit could be applied for redundancy. Yeah this'd be a pain to do by hand, I'm ...
- Mar 27 2009 12:43pm
- Forum: EBike Non-hub Motor Drives
- Topic: Y-pedal's two stage RC drive..........
- Replies: 692
- Views: 81668
Re: Y-pedal's two stage RC drive..........
Why do you use a belt for the primary gear but a chain for the secondary? And why use that chain tensioner instead of a shorter chain? Is it so the chain wraps around more of the gear to spread the load around?
- Mar 26 2009 11:45am
- Forum: Battery Technology
- Topic: 10 000 Miles Konion review ! !
- Replies: 4
- Views: 867
Re: 10 000 Miles Konion review ! !
The guy built his own motor. That's hardcore.
- Mar 25 2009 11:35am
- Forum: EBike Technical
- Topic: 6 awg wiring & 75 Amp connectors
- Replies: 12
- Views: 1543
Re: 6 awg wiring & 75 Amp connectors
This tool crimps those 45-amp contacts well, in addition to the 15- or 30-amp ones.
- Mar 24 2009 12:49pm
- Forum: E-Scooter and Motorcycle General Discussion
- Topic: Motorcycle class Hub Motor
- Replies: 713
- Views: 115303
Re: Motorcycle class Hub Motor
It's true. A bunch of women hand-wind the motors.
- Mar 24 2009 11:27am
- Forum: EBike Technical
- Topic: 6 awg wiring & 75 Amp connectors
- Replies: 12
- Views: 1543
Re: 6 awg wiring & 75 Amp connectors
I don't know. Two-pole andersons insulate the connections, prevent reverse polarity, are rated for many make/break cycles, and they have screw holes for mounting if desired. They also have large plastic grips for uncoupling. I guess those other contacts would be OK if you don't actually plan on disc...
- Mar 23 2009 6:03pm
- Forum: EBike Technical
- Topic: 6 awg wiring & 75 Amp connectors
- Replies: 12
- Views: 1543
Re: 6 awg wiring & 75 Amp connectors
I run around 50 amps through 10-gauge wire. It's rated to handle it. Unless you're using very long wires, which you aren't in an e-bike, I don't think you'll benefit from using a larger wire than 10-gauge for 50 amps or below. The powerpoles, on the other hand, are more useful, since they do have si...
- Mar 22 2009 8:33pm
- Forum: Battery Technology
- Topic: Charging/balancing options for A123
- Replies: 15
- Views: 2511
Re: Charging/balancing options for A123
The problem with using the charger without a balancer is that it only knows the total pack voltage. So if it essentially stops at 28.8V, that doesn't mean every cell is 3.6V; you can have seven cells overcharged at 3.8V with the remaining cell at 2.2V, for example, or seven cells at 3.5V with the la...
- Mar 22 2009 1:22pm
- Forum: E-Vehicles General Discussion
- Topic: Toyota MR2 set to return as Prius coupé? A hybrid MR2?
- Replies: 1
- Views: 562
Re: Toyota MR2 set to return as Prius coupé? A hybrid MR2?
It would be great if something like that gets released in the US but I'm not hopeful. Also 60 mpg UK = 50 mpg US, but that still seems really optimistic and unrealistic to me. But maybe it'll be very light, like 2000 lbs.
- Mar 20 2009 10:54pm
- Forum: E-Scooter and Motorcycle General Discussion
- Topic: Motorcycle class Hub Motor
- Replies: 713
- Views: 115303
Re: Motorcycle class Hub Motor
So weird to see a motorcycle with a hub motor. I wonder how the high wheel weight affects suspension and cornering? Have you tried it? Please post impressions once everything is working fully.
- Mar 19 2009 6:34pm
- Forum: EBike Technical
- Topic: What Fuse to use?
- Replies: 14
- Views: 1216
Re: What Fuse to use?
I also am wondering about the voltage limit of circuit breakers. I have a few that are rated for 30VDC, 42VDC max (which I guess means it works up to 42VDC but not as precisely as under 30VDC?) and I am wondering if they can be used at a higher voltage by putting them inbetween the series-connected ...
- Mar 19 2009 6:23pm
- Forum: EBike Technical
- Topic: Do 5303's make noise?
- Replies: 10
- Views: 799
Re: Do 5303's make noise?
Why would the CycleAnalyst have anything to do with it?
- Mar 18 2009 9:18pm
- Forum: Battery Technology
- Topic: 192V / 100Ah - what cells?
- Replies: 43
- Views: 3902
Re: 192V / 100Ah - what cells?
As oatnet said, you're comparing your wild guesses with people's actual real-world results. Consider: Typical e-bikes, such as mine, average 35-40 Wh/mile, they weigh 80 lbs, they have an extremely small frontal area, and they usually don't go much above 30 mph, so air resistance is negligable. You ...
- Mar 18 2009 3:09am
- Forum: Battery Technology
- Topic: Making an A123 pack
- Replies: 21
- Views: 2553
Re: Making an A123 pack
Can you post better pictures of those deutsch connectors and whatever receptacles you're using for them? I may buy those. They look like a good 12-pin connector, albeit pricey.
- Mar 17 2009 1:52pm
- Forum: Battery Technology
- Topic: 192V / 100Ah - what cells?
- Replies: 43
- Views: 3902
Re: 192V / 100Ah - what cells?
A123 has zero support. The only way to get the M1s is to take apart DeWalt packs and you'll get no support from DeWalt or from A123 if you get a bad cell. 0.5C charge rate is quite a lot for a car-sized pack. That would be 192V 50A to charge a 192V 100Ah pack, or nearly 10 kW. You can't draw that ki...