Search found 256 matches

by PeteCress
Dec 14 2013 5:15pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1853
Views: 618083

Re: Your Creation's Before & After Pics

trevc2 wrote:2006 Specialized Demo 9...60A battery
The battery is not shown, right?

Or is 60AH of battery somehow fitted into that handlebar mount?
by PeteCress
Mar 12 2013 3:13pm
Forum: E-Bike General Discussion
Topic: Switch From 26" to 700c: Anybody Done It?
Replies: 2
Views: 440

Switch From 26" to 700c: Anybody Done It?

I use a Surly 1x1 SS as my "Winter Bike" by mounting a 400w geared drive hub on the front: http://tinyurl.com/an9b5dw With warm weather approaching, I'm getting the urge to try 700c wheels on this thing when I lose the motor/batteries. If 700c works out, I'd be prone to re-lacing the motor into a 70...
by PeteCress
Feb 15 2013 4:00pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1853
Views: 618083

Re: Your Creation's Before & After Pics

Wow, CogHog. I just took a look at the before pic of the Indian and you are a miracle worker! Great job! My only question is why is the seat so far back? Are you super tall? Seat setback? You want to see seat setback? http://tinyurl.com/bnpx2ty I think it's more than just a "tall" thing.... somethi...
by PeteCress
Jan 29 2013 4:37pm
Forum: E-Bike Technical
Topic: Cycle Analyst's "Volts Limit": Adequate Battery Protection?
Replies: 3
Views: 531

Re: Cycle Analyst's "Volts Limit": Adequate Battery Protecti

So, bottom line, isthe "Volts Limit" setting sufficient to protect a battery lacking BMS from having it's voltage drawn down below the safe limit? If there is one weak cell, a BMS can protect it. But reading the whole pack voltage rather than individual cell voltages will leave out that critical de...
by PeteCress
Jan 28 2013 1:55pm
Forum: E-Bike Technical
Topic: Cycle Analyst's "Volts Limit": Adequate Battery Protection?
Replies: 3
Views: 531

Cycle Analyst's "Volts Limit": Adequate Battery Protection?

Cycle Analyst 2.1. I'm running a couple of 36v DeWalt power tool batteries, so I figure that Volts Limit is moot in my case. But I started fooling around with it thinking that maybe some day I'd use a battery sans BMS. Tried setting it to 27v, and it seems tb doing something - although the voltage d...
by PeteCress
Jan 24 2013 8:18pm
Forum: E-Bike Technical
Topic: Fire Hazard: Nil If Battery Not In Use?
Replies: 16
Views: 809

Re: Fire Hazard: Nil If Battery Not In Use?

dnmun wrote:why would anyone discharge a lipo below 2.7V if that is fully discharged?
DogMan's observation rang true to me: accidental discharge via parasitic load by the controller.
by PeteCress
Jan 24 2013 10:42am
Forum: E-Bike Technical
Topic: Fire Hazard: Nil If Battery Not In Use?
Replies: 16
Views: 809

Fire Hazard: Nil If Battery Not In Use?

Does the fire hazard on batteries go away when the battery is neither being charged nor discharged?

i.e. Should I be parking my ebike in the garden shed instead of the garage?
by PeteCress
Jan 24 2013 10:28am
Forum: E-Bike Technical
Topic: Best Power-Weight For 4 AH System?
Replies: 11
Views: 1272

Re: Best Power-Weight For 4 AH System?

SamTexas wrote: You had the quotes mixed up. I didn't say that.
My bad. It's fixed now.
by PeteCress
Jan 24 2013 9:23am
Forum: E-Bike Technical
Topic: Best Power-Weight For 4 AH System?
Replies: 11
Views: 1272

Re: Best Power-Weight For 4 AH System?

Rc lipos are dangerous, they have a near-zero tolerance for neglect, and the results of neglecting to treat a pack right can vary from trashing the pack, to trashing your house, workplace, garage etc... Somewhere on Endless-Sphere, there was a minimalist build by somebody in the UK that included a ...
by PeteCress
Jan 23 2013 4:19pm
Forum: Battery Technology
Topic: What battery capacity do I need for my e-cycle?
Replies: 8
Views: 670

Re: What battery capacity do I need for my e-cycle?

I live in a little 20x25mile island, so even a return trip end to end would only be 50miles, but most of my return trips are only aprox 25miles. I know the average speed of a cyclist is aprox 15MPH.... If I am working this out right, 25miles at an average speed of 15MPH would take 1.666hours. So if...
by PeteCress
Jan 23 2013 3:32pm
Forum: Battery Technology
Topic: Open-source alternative to DeWalt DC9360 since Stanley shaft
Replies: 12
Views: 1611

Re: Open-source alternative to DeWalt DC9360 since Stanley s

999zip999 wrote:What size battery pack are you building and for what ?
3-5 AH strictly to help me avoid mouth breathing below a certain temperature.

Above that temp, I ride my regular bikes.
by PeteCress
Jan 23 2013 11:16am
Forum: Battery Technology
Topic: Open-source alternative to DeWalt DC9360 since Stanley shaft
Replies: 12
Views: 1611

Re: Open-source alternative to DeWalt DC9360 since Stanley s

What would be the fallacy in putting two Bosche Fat Packs in series to get 36v and 4+ AH?

viz: http://tinyurl.com/a5q3e4d

What about parallel? Would 18v be too low to achieve 12 mph?
by PeteCress
Jan 23 2013 10:34am
Forum: Battery Technology
Topic: Open-source alternative to DeWalt DC9360 since Stanley shaft
Replies: 12
Views: 1611

Re: Open-source alternative to DeWalt DC9360 since Stanley s

SamTexas wrote:Are you positive you have A123 in your Dewalt pack?
Yes. I have had one of them apart to replace a blown BMS.
by PeteCress
Jan 22 2013 7:31pm
Forum: E-Bike General Discussion
Topic: Any Chromoly frames with a low seat-tube height?
Replies: 11
Views: 867

Re: Any Chromoly frames with a low seat-tube height?

Chalo wrote:Was the problem with the bolt? If so, that's an easy part to replace.
Yes. The bolt sheared catestrophically (or however you spell it....).

The issue is not with replacing a bolt. The issue is with being killed or terribly injured.
by PeteCress
Jan 22 2013 6:56pm
Forum: E-Bike Technical
Topic: Best Power-Weight For 4 AH System?
Replies: 11
Views: 1272

Re: Best Power-Weight For 4 AH System?

http://www.hobbyking.com/hobbyking/store/__21368__ZIPPY_Compact_4000mAh_10S_25C_Long_Lipo_Pack.html Any idea what the tradeoffs are between that one and the Turnigy product at roughly twice the price? viz: http://tinyurl.com/b5aluff I see higher discharge/charge rates. Is that about it? Or might th...
by PeteCress
Jan 22 2013 4:00pm
Forum: Battery Technology
Topic: Open-source alternative to DeWalt DC9360 since Stanley shaft
Replies: 12
Views: 1611

Re: Open-source alternative to DeWalt DC9360 since Stanley s

...I am still using my unadulterated DC9360s after well over 1000 charges... Bump... How many AH are you getting out of them now? I'm down to about 1.8 AH per pack and wondering if mine are on the way out or that's within the bounds of normal - given that they've been abused somewhat having been ru...
by PeteCress
Jan 22 2013 3:31pm
Forum: E-Bike Technical
Topic: Best Power-Weight For 4 AH System?
Replies: 11
Views: 1272

Re: Best Power-Weight For 4 AH System?

As far as power to weight in small packages, the turnigy nano-tech packs are hard to beat. And 4ah packs are available pre-assembled. What voltage do you need? The DeWalts claim 36 but measure more like 32 off the charger. I wouldn't want to go lower than that. A true 36 would be great. The control...
by PeteCress
Jan 22 2013 3:28pm
Forum: E-Bike General Discussion
Topic: Any Chromoly frames with a low seat-tube height?
Replies: 11
Views: 867

Re: Any Chromoly frames with a low seat-tube height?

...so that a Thudbuster suspension seat-post would fit.... This is tangental, but I would beware of Thudbusters - at least those with the single saddle rail tension bolt. I've had a failure on one that would have killed me in traffic. No bumps... just riding along on a smooth flat surface. I called...
by PeteCress
Jan 22 2013 1:32pm
Forum: E-Bike Technical
Topic: Best Power-Weight For 4 AH System?
Replies: 11
Views: 1272

Best Power-Weight For 4 AH System?

My dual DC9360's seem tb on the way out: they're down from a total of 4.4 measured AH per charge to about 3.7. If the decline curve flattens out, maybe I'm good for a few more seasons... but if it steepens.... If/when I replace them, I'll be looking for something in the neighborhood of 4 AH... or ev...
by PeteCress
Jan 27 2012 1:15pm
Forum: Battery Technology
Topic: Dewalt A123 BMS battery interface solution
Replies: 121
Views: 48569

Re: Dewalt A123 BMS battery interface solution

It would be good to know the current drain of the internal Dewalt BMS. I would not trust my cyclone controller with the Dewalts for more than a week or two. So don't forget to account for the drain from the controller. I notice they become unbalanced from being used with high current loads. Well, t...
by PeteCress
Jan 27 2012 9:24am
Forum: Battery Technology
Topic: Dewalt A123 BMS battery interface solution
Replies: 121
Views: 48569

Re: Dewalt A123 BMS battery interface solution

Some chemistries, like NiMH, are not tolerant of disuse. It may not matter for A123s, but just to be conservative, I try to cycle mine at least once a month in winter. That sounds like a promising explaination. My use is even more abusive: I only use them during winter months and they have been sit...
by PeteCress
Jan 26 2012 2:08pm
Forum: Battery Technology
Topic: Dewalt A123 BMS battery interface solution
Replies: 121
Views: 48569

Re: Dewalt A123 BMS battery interface solution

CyclemotorEngineer wrote:How old are your packs? There is a stamped date code next to the recycle tag which is six numbers corresponding to a year and week. Mine are all between 200618 and 200637.
I only have 2 packs and they are stamped "2009 09-U0" and "2009 12-U0".
by PeteCress
Jan 26 2012 11:17am
Forum: Battery Technology
Topic: Dewalt A123 BMS battery interface solution
Replies: 121
Views: 48569

Re: Dewalt A123 BMS battery interface solution

CyclemotorEngineer wrote:My circa 2006 packs are still going strong, after over 1000 charge cycles.
How many Ah do you get out of a pack now?

I'm down to about 2 from 2.2 - but more like 100 than 1,000 charge cycles - and wondering if that is normal wear-and-tear.
by PeteCress
Nov 05 2011 5:51pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1853
Views: 618083

Tomac 2002

Are your fork's dropouts alu or steel?

If alu, there could be a problem lurking there where the motor's torque spins the axle within the dropouts.

Dunno what the injury probability is, but the fork will be toast.
by PeteCress
Oct 12 2011 9:50am
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1853
Views: 618083

Re: Your Creation's Before & After Pics

lianjuin wrote:20'' Juiced Riders ODK Utility Bicycle...
My experience battery-wise has been that lower is better - and really-low is a *lot* better.

That one appeals for that reason.

On the pre-built electrics they sell (http://www.juicedriders.com), it looks like it could even go 4-6" lower.