Search found 50 matches

by stingray17
Jun 19 2013 4:51pm
Forum: Battery Technology
Topic: 3-192S Arduino BMS (using BQ76PL536A)
Replies: 78
Views: 19453

Re: BQ76PL536A Arduino Shield

I'm dying to get my hands on a compact microcontroller system to allow me to monitor a 14S ebike pack. Right now I'm just going with opto-isolated alarm outputs from 2x CellLog 8M's that I can easily unplug when not in use. But I am a data hound and want to monitor everything, plus maybe eventually ...
by stingray17
May 02 2012 4:51pm
Forum: E-Bike General Discussion
Topic: Trying to plan out first build
Replies: 21
Views: 1227

Re: Trying to plan out first build

The Ping battery at 10Ah probably does not have the discharge rate you want. The cells are rated 1C discharge. I have found that 1.5C is fine. If you are going to keep it at 15 Amps or so, no problem... although you don't really need a 9 FET controller, a 6 FET would be fine. But running at 20A for ...
by stingray17
Apr 21 2012 6:07pm
Forum: E-Bike General Discussion
Topic: Ebrake handle left or right hand side?
Replies: 11
Views: 443

Re: Ebrake handle left or right hand side?

I don't currently use regen, but I like to have brake cutoffs on both sides. Not just for safety, but also because I prefer the more symmetrical look of matching brake levers. Throttle cutoffs are normally-open switches, so wire in parallel. On the safety side, sure I am capable of quickly releasing...
by stingray17
Apr 11 2012 3:14am
Forum: E-Bike Technical
Topic: How do you water cool a water cooled ESC?
Replies: 6
Views: 889

Re: How do you water cool a water cooled ESC?

No, that controller probably does not have its own pump. And yes, that one is intended for a boat, but that is not the only way to use water cooled motor controllers. If you want to do water cooling, you could use equipment designed for a boat, but wouldn't necessarily have to. You could also buy or...
by stingray17
Mar 15 2012 2:08pm
Forum: E-Bike Technical
Topic: Help please, i think i may have a problem with my CA
Replies: 2
Views: 283

Re: Help please, i think i may have a problem with my CA

Well, not sure, but here is some stuff I would try/check if I were you: * Wheel diameter set correctly, speedo working accurately? * When you remove the magnet or sensor from the wheel, CA speedo reads 0mph (proves it's wired right and not getting a speed signal from the controller) * Advanced setti...
by stingray17
Feb 16 2012 7:00pm
Forum: E-Bike Technical
Topic: Help: wheel spins up when I twist, then coasts off.
Replies: 6
Views: 390

Re: Help: wheel spins up when I twist, then coasts off.

This sounds like exactly what happens when the phase current or other values go out of range, and the controller shuts off the motor until releasing the throttle resets it. Probably reprogramming the controller will fix this. You might find that the phase current limit is too low and/or the "block t...
by stingray17
Jan 17 2012 12:13pm
Forum: Alternative Energy
Topic: Solar power house info With link for cheep pricing
Replies: 68
Views: 13913

Re: Solar power house info

I have gone out with a hose some times on a hot summer day and hosed down my panels and the wattage shoots up for a while. Kurt Kurt, I would recommend that you do not do that on a hot day... The rapid change in temperature can easily crack/shatter the glass on the solar modules! I've seen it happen.
by stingray17
Jan 17 2012 11:52am
Forum: E-Bike Reviews & Testing
Topic: Dahon Mu SL + ebikes eZee kit + ping 48V 10Ah
Replies: 8
Views: 4048

Re: Dahon Mu SL + ebikes eZee kit + ping 48V 10Ah

I chose the eZee for my first kit because of the reputation for reliability and for support from ebikes.ca ... I put 3000 miles on that motor before selling it and never had a single problem, so I was happy with that choice. Nothing against the cheaper motors tho. I agree about the cables! Soon afte...
by stingray17
Dec 06 2011 3:54pm
Forum: E-Bike General Discussion
Topic: folding bike conversion?
Replies: 31
Views: 3198

Re: folding bike conversion?

All of the rear wheel hub motors I have seen are 135mm. I have put hub motors on two Dahon bikes. The Mu (I used a Mu SL) was possible but rather difficult to get the wheel in. I didn't permanently re-set the frame because with an aluminum frame I understand that is less safe. I just sprung it out a...
by stingray17
Nov 27 2011 12:43am
Forum: E-Bike General Discussion
Topic: folding bike conversion?
Replies: 31
Views: 3198

Re: folding bike conversion?

Dahon Speed D7 makes a great folding electric bike. Sounds like you've already picked out a motor and everything, I think it's going to work well. One thing I would recommend is that you use good lock washers AND a torque arm and make sure that wheel is sitting all the way in the dropouts. Might eve...
by stingray17
Nov 14 2011 7:34pm
Forum: E-Bike Technical
Topic: Adding an external speedometer to a direct plug CA
Replies: 2
Views: 477

Re: Adding an external speedometer to a direct plug CA

Yes you can. The speedometer on a DPS/SA model is very simple. It consists of a reed switch attached to a cable, plus a magnet attached to your wheel. You can cannibalize an old wired bike computer to get the reed switch and magnet. Then you connect the two wires of the reed switch between "Gnd" and...
by stingray17
Nov 04 2011 4:37pm
Forum: E-Bike General Discussion
Topic: what kind of looks do you get from human powered cyclists?
Replies: 45
Views: 2769

Re: what kind of looks do you get from human powered cyclist

I don't think I've ever gotten dirty looks from human-power bicyclists here in the San Francisco Bay Area... Although maybe I was going too fast and missed it. I have gotten bemused looks, and sometimes if I'm stopped at a light and they catch me, they ask me where the motor is. Usually this is with...
by stingray17
Nov 04 2011 4:16pm
Forum: E-Bike General Discussion
Topic: e bike crashes, whats your experiences
Replies: 40
Views: 3183

Re: e bike crashes, whats your experiences

I've had four notable crashes on my first ebike. Two of them were going through intersections where I had the right of way and got hit by a car anyhow. One time I got pretty messed up with a concussion (and broken helmet) and the bruises took months to heal. The second time, it finally got through m...
by stingray17
Oct 21 2011 2:54pm
Forum: E-Bike Technical
Topic: throttle keeps failing
Replies: 14
Views: 1238

Re: throttle keeps failing

The wires to the lights and power cutoff is rather loose, so I had it rejoined. One thing I noticed is that when the head lights are on and the throttle is turned ( yet another throttle, this time from an old bike) the lights would dim a little and if i swing the handle left with some strength, it ...
by stingray17
Oct 20 2011 1:19am
Forum: E-Bike General Discussion
Topic: My e-bike ruled legal in Hawaii
Replies: 13
Views: 1869

Re: My e-bike ruled legal in Hawaii

After five weeks of hitchhiking, I got my chance to challenge the ticket in court. I provided the text of HR 727, documentation showing my motor puts out a nominal 716 watts, a picture of the bike, and simply stating the controller governs it to 20 MPH. After some lengthy pondering and out loud rum...
by stingray17
Oct 19 2011 1:30pm
Forum: E-Bike Technical
Topic: throttle keeps failing
Replies: 14
Views: 1238

Re: throttle keeps failing

Couple of possibilities... First off this might be a dumb question, but are you sure the throttle is really getting damaged? Just want to make sure... if you turn everything off wait 5 minutes and reconnect the throttle you are getting absolutely nothing, but if you connect a different throttle it w...
by stingray17
Oct 14 2011 3:24pm
Forum: General Discussion
Topic: could use some electrical help here, thanks...
Replies: 18
Views: 2017

Re: could use some electrical help here, thanks...

hey ptd, how's it going? After amberwolf's tests above the next thing I would check if I were you is the throttle... The throttle typically has three wires or maybe 4. They are: 1. Ground 2. +5V Power 3. Speed Control back from throttle to controller 4. (sometimes) battery voltage for bat level ligh...
by stingray17
Oct 14 2011 2:59pm
Forum: General Discussion
Topic: ANYONE KNOW WHAT RISK SOLAR FLARES POSE TO A E-BIKE
Replies: 24
Views: 1142

Re: ANYONE KNOW WHAT RISK SOLAR FLARES POSE TO A E-BIKE

(credit to Alan B who inspired this amazing plan in another thread .) 1. construct secure metal box 2. put spare controller, battery charger and a few hall effect sensors in box. extra shotgun shells optional. 3. bury box in the backyard 4. wait for EMP apocalypse 5. dig up box, effect repairs 6. be...
by stingray17
Oct 11 2011 11:21am
Forum: E-Bike Technical
Topic: Throttle interface for sensitive high power setups
Replies: 224
Views: 24514

Re: Throttle interface for sensitive high power setups

Until we have torque throttles, we're stuck with what we got, and that reality is a throttle that works differently at different speeds, so the guys doing micros need to get a wire tied in to detect speed. eg at very low speed somewhere in the range of 20-30% throttle from there on up is the same a...
by stingray17
Oct 10 2011 7:41pm
Forum: Battery Technology
Topic: Finished standard high-rate e-bike battery?
Replies: 10
Views: 800

Re: Finished standard high-rate e-bike battery?

I wouldn't recommend running a ping 10Ah pack at 20A constant on a regular basis. That was my first battery pack, and it will do it, but I found that my capacity seemed to degrade fairly quickly when drawing more than 1.5C constant. For pre-made 10 Ah packs with >20A rates, as others have said cell_...
by stingray17
Oct 10 2011 7:27pm
Forum: Battery Technology
Topic: Please help with Electricity Math
Replies: 23
Views: 1891

Re: Please help with Electricity Math

For running a mobile computer, you would be better off if you can reduce your power needs at least a little bit! Might mean running only one hard drive, one video card instead of SLI team, etc. Then skip the inverter and AC power supply, and run the PC from an M4-ATX. It's a DC-DC computer power sup...
by stingray17
Oct 10 2011 5:49pm
Forum: E-Bike General Discussion
Topic: Correct CA Shunt calibration?
Replies: 5
Views: 711

Re: Correct CA Shunt calibration?

To calibrate CA for an unknown shunt, or to fine-tune it, you can just GUESS the shunt value, then either calibrate the CA "on the bike" using an external DC energy meter (such as a Turnigy or WattsUp power analyzer), or calibrate it against a constant-current charger by running a known current thro...
by stingray17
Oct 10 2011 5:29pm
Forum: E-Bike General Discussion
Topic: kmxtornado's first e-bike conversion build thread *photos*
Replies: 83
Views: 11778

Re: Please help me with an e-bike setup/design

I will second (third, fourth?) the recommendation to get a MAC from cell_man given your needs. (Check his profile or look in the for-sale forum) BMC/Puma/eZee motors are good but too expensive, they'd blow out your budget. You could get a 10-turn or 12-turn high torque motor that would be able to ge...
by stingray17
Oct 10 2011 3:58pm
Forum: E-Bike Technical
Topic: Throttle interface for sensitive high power setups
Replies: 224
Views: 24514

Re: Throttle interface for sensitive high power setups

If you are just trying to change the throttle response, and adjust endpoints, an easy and cheap DIY method would be to buy a Arduino Nano for US$17 http://www.dealextreme.com/p/arduino-nano-v3-0-81877. Then use a simple bit of code like this. [...] Once wired up it will power up from your throttle ...
by stingray17
Oct 03 2011 4:01pm
Forum: E-Bike Technical
Topic: calibrating a cycleanalyst with a watt meter?
Replies: 14
Views: 1815

Re: calibrating a cycleanalyst with a watt meter?

Paul_G that's not a bad idea either. Using an external DC amp meter and tweaking the value up/down until the CA matches the meter is also a simple and direct way to do it. That would also be a good technique if you have one of those meters. However, it's not the only proper way. Using a WattsUp mete...