Search found 583 matches

by pdf
Aug 20 2013 10:47am
Forum: E-Bike Build Threads / Photos & Video
Topic: Custom Frame Cruiser:+/- finished pg.5
Replies: 124
Views: 22459

Re: Custom Frame Cruiser

I love these custom bikes! When I am reincarnated, I am going to build bikes. Right now, too much to do, too little time.
by pdf
Aug 12 2013 4:10pm
Forum: E-Bike Technical
Topic: "LiPO", another "be careful" warning...
Replies: 54
Views: 4349

Re: "LiPO", another "be careful" warning...

Thanks for sharing this report. So to have a safe system without bms or cycle analyst or even voltage monitoring: 1) design the bike so that the battery wire is unplugged routinely to turn the bike off. This can also be used in the rare event of controller run-away. The battery should be stored in ...
by pdf
Aug 09 2013 3:10pm
Forum: E-Bike Technical
Topic: "LiPO", another "be careful" warning...
Replies: 54
Views: 4349

Re: "LiPO", another "be careful" warning...

Just to clarify, I had no intention of using this pack for any other purpose than testing. I was not riding it to get anywhere but just to test the capacity. I wanted to know if it could be recovered by balance charging. It could not. I could, I am sure, have removed the cells that went below, say, ...
by pdf
Aug 09 2013 12:14pm
Forum: E-Bike Technical
Topic: "LiPO", another "be careful" warning...
Replies: 54
Views: 4349

Re: "LiPO", another "be careful" warning...

Ypedal wrote:well, as you said, this was a pretty extreme case of abuse and the expected, happened.

any damage to the bike ? or were you able to get the pack off in time ?
Bike is fine, controller is toasty.
by pdf
Aug 09 2013 10:47am
Forum: E-Bike Technical
Topic: "LiPO", another "be careful" warning...
Replies: 54
Views: 4349

"LiPO", another "be careful" warning...

NOTE: This is not a condemnation of LiPO; it has some amazing properties and there is a time and place for it. Just a reminder from the real world to be careful. I have been doing some experiments with a "LiPO" (Lithium colbalt I think is the correct name but it is the bricks from HobbyKing I am tal...
by pdf
Aug 09 2013 10:13am
Forum: Forum Rules and Features
Topic: PM Stuck in Outbox
Replies: 57
Views: 12471

PM stuck in outbox

I have a PM I tried to send several days ago stuck in the Outbox for days. What could I be doing wrong? I have sent PMs before without a problem, although I did have one take a day to actually be sent.+
by pdf
Aug 09 2013 10:11am
Forum: E-Bike Technical
Topic: Jamis Dakar 1.0 XLT rear caliper clearance, hub motor
Replies: 1
Views: 178

Jamis Dakar 1.0 XLT rear caliper clearance, hub motor

Have found a reasonable deal on a Jamis Dakar 1.0 (2005). Just looking at the rear calipers (Hayes HFX-9 hydraulic disc brakes), it looks like clearance could be an issue on a rear hub motor. I measured the distance between the face of the disk mount and the motor casing on a Crystalyte 35 series an...
by pdf
Aug 04 2013 12:01pm
Forum: E-Vehicles General Discussion
Topic: Rough rider NOT wanted
Replies: 15
Views: 1848

Re: Rough rider NOT wanted

Thanks for the input. On the regular (non-longbike) frames with the hub motors, the battery was in the front triangle. The longbike I referenced is a mid-drive (not a hub motor) Stokemonkey and has battery in the front triangle also. If I could replicate that ride on a non-longbike, I would be quite...
by pdf
Aug 02 2013 2:04pm
Forum: E-Bike Technical
Topic: Using cell monitor/balancer with LiPO
Replies: 13
Views: 789

Re: Using cell monitor/balancer with LiPO

If you know what you're doing you'll know. Well, I thought so until you put it like that! 50 amps is not a problem. And if the difference between a balance board and BMS is LVC/HVC, single cell monitoring, pack voltage monitoring then yes, that would be nice also. I've got four battery packs right ...
by pdf
Aug 02 2013 11:24am
Forum: E-Bike Technical
Topic: Using cell monitor/balancer with LiPO
Replies: 13
Views: 789

Re: Using cell monitor/balancer with LiPO

I just had a look at this $40 offering http://www.bestekpower.com/666v18spcmbmspcbforli-ionli-polymerbatterypack/PCB-D166.html It consumes 0.00002 amps maximum. It balances at 0.084 amps. It balances 4000 times greater than it discharges. Every hour of balancing corrects 6 months of consumption. Th...
by pdf
Aug 02 2013 8:52am
Forum: E-Bike Technical
Topic: Using cell monitor/balancer with LiPO
Replies: 13
Views: 789

Re: Using cell monitor/balancer with LiPO

There is a circuit board for the job. Constant connection like you want, and does your balancing and many other feature's. I'm surprised you have not heard of it, all commercially sold packs have one inside. They do lvc and hvc, short circuit and overload. Some will even talk to your PC if you want...
by pdf
Aug 02 2013 8:26am
Forum: E-Vehicles General Discussion
Topic: Rough rider NOT wanted
Replies: 15
Views: 1848

Re: Rough rider NOT wanted

Thanks, dogman. The bumps aren't large, just short and steep. Probably like riding over a hundred 1 to 2 inch limbs in the road each day. I took one of the frames with a hub motor in in (a cheap frame with a cheap fork and hardtail and not a longtail) in today. If I keep the ride under about 14 mph,...
by pdf
Aug 01 2013 8:03pm
Forum: E-Bike General Discussion
Topic: Frame kit, mount a mid motor in that gaser
Replies: 12
Views: 1244

Re: Frame kit, mount a mid motor in that gaser

One vote for "awesome". Great job! Good luck on the kickstarter.
by pdf
Aug 01 2013 4:19pm
Forum: E-Vehicles General Discussion
Topic: Rough rider NOT wanted
Replies: 15
Views: 1848

Rough rider NOT wanted

I have been tinkering with several different frame/motor combinations. My daily rider is a Stoked Xtracycle (Stokemonkey on an Xtracycle). For ride comfort, it is very hard to beat. The greenway I use has a lot of places where tree roots have created pretty bad bumps, short steep ones, but up to aro...
by pdf
Aug 01 2013 3:49pm
Forum: E-Bike Technical
Topic: Using cell monitor/balancer with LiPO
Replies: 13
Views: 789

Re: Using cell monitor/balancer with LiPO

If you have just three plugs to check, it's not hard to whip a cellog 8 from your pocket, and check your cells. If you do it often, you get to know the pack well, and can weed out any stinkers. At that point, you can get away with just watching the pack voltage on all but the deepest discharges. Ju...
by pdf
Aug 01 2013 2:32pm
Forum: E-Bike Technical
Topic: Using cell monitor/balancer with LiPO
Replies: 13
Views: 789

Re: Using cell monitor/balancer with LiPO

Not a good idea for many reasons: 1) 50mA balancing current: The balancing current is too small to handle the normal charging current. So when cells get out of balance, this balancer can only slow down the imbalance rate, but cannot stop it. Eventually one or more cells will be overcharged. This ba...
by pdf
Aug 01 2013 11:40am
Forum: E-Bike Technical
Topic: Using cell monitor/balancer with LiPO
Replies: 13
Views: 789

Using cell monitor/balancer with LiPO

All, I have a bike that uses a slow wound 9C and needs an approx. 72v battery. I use three 6s LiPO packs in series. I bought a bulk charger from BMSBattery that charges to about 75v to simplify charging; I just leave the pack in series. I would like to add some balancing and perhaps detection for lo...
by pdf
Jul 24 2013 11:31am
Forum: E-Bike Technical
Topic: reganative bicycle with car alternator???
Replies: 11
Views: 1272

Re: reganative bicycle with car alternator???

Some good comments here. I would point out, though, that unless you don't have access to the grid, an ebike uses so little energy that there is very little point (except if you just want to do it) to not using the grid. As a data point, I have a round trip of between 13 and 14 miles and use 2.5 cent...
by pdf
May 03 2013 3:42pm
Forum: E-Bike General Discussion
Topic: Help finding bms
Replies: 17
Views: 924

Re: Help finding bms

not sure why you decided on 30S but they do go up to 26S with this hi current jobbie which i expect will be around $100 which is cheap but i can get quotes for you or you can email henry: http://www.bestekpower.com/832v26spcmbmspcbforli-ionli-polymerbatterypack/PCB-D138.html and if you only go to 7...
by pdf
May 02 2013 10:43am
Forum: Battery Technology
Topic: LiPo safety question
Replies: 22
Views: 1310

Re: LiPo safety question

Sorry to pump life into a dead thread, and I may be adding old information to a well worn topic but I have some new "data" to share. I have three 6s 5ahr Turnigy packs that were connected in series strapped to a bike and charged with a bulk charger at 75V, or there abouts (don't remember the exact n...
by pdf
May 01 2013 8:40am
Forum: E-Bike General Discussion
Topic: Replacing Lipo Cell was easy. Only used 40watt weller iron.
Replies: 10
Views: 610

Re: Replacing Lipo Cell was easy. Only used 40watt weller ir

Hmmm. My experience was different. In fact, after I got the solder off, I think there was not enough residual solder to let the heat flow to the tab to desolder where it was still stuck (maybe with solder, maybe with flux) to the board. I needed two extra hands to hold everything and pry at the same...
by pdf
Apr 28 2013 9:39am
Forum: E-Bike General Discussion
Topic: sydney to the gold coast by e-trike
Replies: 97
Views: 7872

Re: sydney to the gold coast by e-trike

Awesome! Will be riding along vicariously.
by pdf
Apr 23 2013 9:47am
Forum: E-Vehicles General Discussion
Topic: Anyone else accidently/stupidly shorting their connectors?
Replies: 41
Views: 5157

Re: Anyone else accidently/stupidly shorting their connector

My most common error is trying to plug in the balance connector on LiPO upside down when using the balance charger. Bam! Probably done that three or four times. I've only tried to plug in a bullet plug backwards once. Well, then there was the time I blew up a charger because I put a bullet connector...
by pdf
Apr 22 2013 1:29pm
Forum: Battery Technology
Topic: LiPo safety question
Replies: 22
Views: 1310

Re: LiPo safety question

From my (limited) experience with LiPO, I think the following is possibly a common failure mode: LiPO is often used for high C rate at low total energy, so for example 5 Ahr drawing 20 amps. LiPO is the only way to do it cheaply. They are often run without a BMS also so people don't know what each c...
by pdf
Apr 22 2013 9:42am
Forum: E-Bike General Discussion
Topic: Shout out to DC Ebikers (esp. dbaker)
Replies: 0
Views: 173

Shout out to DC Ebikers (esp. dbaker)

I was in DC last Thursday and Friday at the National Sustainable Design Expo with a group of 5 undergraduate students exhibiting our project on using ebike construction as a way to introduce high school teens to low impact transportation specifically and the impacts of transportation mode choice, ge...