Search found 654 matches

by CGameProgrammer
Oct 29 2015 7:57pm
Forum: Stand-up E-scooters and E-skateboards
Topic: e twow mods
Replies: 5
Views: 1239

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.
by CGameProgrammer
Oct 19 2010 6:07pm
Forum: General Discussion
Topic: Weird electrical noise issue
Replies: 0
Views: 243

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...
by CGameProgrammer
Dec 18 2009 10:54pm
Forum: E-Bike Technical
Topic: I want train-approaching-station alternating lights!
Replies: 7
Views: 753

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 ...
by CGameProgrammer
Dec 18 2009 6:45pm
Forum: E-Bike Technical
Topic: I want train-approaching-station alternating lights!
Replies: 7
Views: 753

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...
by CGameProgrammer
Dec 18 2009 6:20pm
Forum: E-Bike Technical
Topic: I want train-approaching-station alternating lights!
Replies: 7
Views: 753

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...
by CGameProgrammer
Apr 15 2009 11:54am
Forum: Battery Technology
Topic: A123 Pack building...
Replies: 6
Views: 977

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.
by CGameProgrammer
Apr 07 2009 11:01pm
Forum: Battery Technology
Topic: Chrysler & A123Systems agree-A123 prismatic 20Ah cell IMAGE!
Replies: 16
Views: 4745

Re: Chrysler & A123Systems agree-A123 prismatic 20Ah cell IMAGE!

The last paragraph is key: mild hybrid conversions of existing models. Yawn. Doomed to failure.
by CGameProgrammer
Apr 06 2009 11:31am
Forum: Battery Technology
Topic: The care and feeding of a123-based packs...
Replies: 548
Views: 107349

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...
by CGameProgrammer
Mar 30 2009 4:55pm
Forum: Battery Technology
Topic: ===== All LiFePO4 cells compare Database =====
Replies: 9
Views: 818

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...
by CGameProgrammer
Mar 27 2009 9:42pm
Forum: E-Vehicles General Discussion
Topic: Top Gear British TV Show Faked Tesla Battery Failure
Replies: 10
Views: 756

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...
by CGameProgrammer
Mar 27 2009 4:18pm
Forum: Battery Technology
Topic: LiPo battery care and basic information
Replies: 272
Views: 69810

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 ...
by CGameProgrammer
Mar 27 2009 12:43pm
Forum: E-Bike Non-hub Motor Drives
Topic: Y-pedal's two stage RC drive..........
Replies: 692
Views: 66127

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?
by CGameProgrammer
Mar 26 2009 11:45am
Forum: Battery Technology
Topic: 10 000 Miles Konion review ! !
Replies: 4
Views: 632

Re: 10 000 Miles Konion review ! !

The guy built his own motor. That's hardcore.
by CGameProgrammer
Mar 25 2009 11:35am
Forum: E-Bike Technical
Topic: 6 awg wiring & 75 Amp connectors
Replies: 12
Views: 958

Re: 6 awg wiring & 75 Amp connectors

This tool crimps those 45-amp contacts well, in addition to the 15- or 30-amp ones.
by CGameProgrammer
Mar 24 2009 12:49pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Motorcycle class Hub Motor
Replies: 713
Views: 94010

Re: Motorcycle class Hub Motor

It's true. A bunch of women hand-wind the motors.
by CGameProgrammer
Mar 24 2009 11:27am
Forum: E-Bike Technical
Topic: 6 awg wiring & 75 Amp connectors
Replies: 12
Views: 958

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...
by CGameProgrammer
Mar 23 2009 6:03pm
Forum: E-Bike Technical
Topic: 6 awg wiring & 75 Amp connectors
Replies: 12
Views: 958

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...
by CGameProgrammer
Mar 22 2009 8:33pm
Forum: Battery Technology
Topic: Charging/balancing options for A123
Replies: 15
Views: 1824

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...
by CGameProgrammer
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: 338

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.
by CGameProgrammer
Mar 20 2009 10:54pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Motorcycle class Hub Motor
Replies: 713
Views: 94010

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.
by CGameProgrammer
Mar 19 2009 6:34pm
Forum: E-Bike Technical
Topic: What Fuse to use?
Replies: 14
Views: 903

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 ...
by CGameProgrammer
Mar 19 2009 6:23pm
Forum: E-Bike Technical
Topic: Do 5303's make noise?
Replies: 10
Views: 527

Re: Do 5303's make noise?

Why would the CycleAnalyst have anything to do with it?
by CGameProgrammer
Mar 18 2009 9:18pm
Forum: Battery Technology
Topic: 192V / 100Ah - what cells?
Replies: 43
Views: 2602

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 ...
by CGameProgrammer
Mar 18 2009 3:09am
Forum: Battery Technology
Topic: Making an A123 pack
Replies: 21
Views: 2083

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.
by CGameProgrammer
Mar 17 2009 1:52pm
Forum: Battery Technology
Topic: 192V / 100Ah - what cells?
Replies: 43
Views: 2602

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...