KMX Cobra

[Tommy L]

Maybe time for upgrading to the new V3 cycle analyst

I contacted Justin to get one for my new Zero motorcycle

Doc

DOC!!!! You have a new ZERO? I can't wait to see some posts..

[Tommy L]

I disconnected both 24v 10ah packs to charge with 2 seperate soneil 5 amp chargers..

Once charged, i checked all cell voltages, 16 cells all at 3.457v , perfection ! ( No BMS, 2+years not ballancing, used at times, sitting for months .. )

so i grab a red and a black that are aimed at the Cycle Analyst and hook'em up., i hear a " pop " . that familiar crackle you get when the controller powers up ( charging capacitors )

I use a 100watt light bulb as a pre-charge
Still a little pop/crackle, but way smaller!

Got that tip here on ES

So glad that no one or your project got damaged. \\m//

Tommy L sends....

[Ypedal]

Been taking the KMX out for rides almost every night, have had everyone i know try it ( at least 20 test pilots so far ) and gets big thumbs up from everyone..

Tonight the sky was grey but the urge to ride got me out again, this time my neighbor came along on his 100v 9C 100 amp bike ( damit.. i need more power.. emailing Lyen as soon as i post this to confirm a controller purchase.. 18 fet 4110 unit on it's way shortly. )

Went to the local park, was a school football game on, plenty of questions and looks ( must remember to bring business cards when i go out on this thing, at least i had the shirt ! ) .. it's a chair anywhere you go.. pure awsome..

the PSI cells are good to go.. no sign of damage from the dead short incident, and delivering 7ah with voltage holding strong. cool.

the CA has been working properly since the weather has warmed up, no more black blocks.. yet...

[Sacman]

So where are the videos of you screamin' around town?

[Tommy L]

So where are the videos of you screamin' around town?

Yes YPEDAL..... just where are those vids? lol

Uploading mine to YouTube as I write this.....

Tommy L sends...

[Ypedal]

heh heh.. was telling the neighbor last night we need to get video making.. not very impressive at only 48v, but at least we can make a before and after comparison !

Weather is going to suck pretty hard for next few days but hopefully on the weekend we get some clear skies.. got a reply from Lyen last night, controller will ship soon.

Must also order some lipo.. that's a today plan.

[bdc43]

Would have loved to join you and your neighbour on your test ride but I was stuck recharging my pack from a ride the night before (got home late so didn't have time to charge before heading to bed). Hopefully I can join you guys on the weekend (if the weather holds).

[Ypedal]

alrighty...

I just ordered 6 of these to get started with, first time ordering nano's. :
http://www.hobbyking.com/hobbyking/stor ... duct=20548

[Tommy L]

alrighty...

I just ordered 6 of these to get started with, first time ordering nano's. :
http://www.hobbyking.com/hobbyking/stor ... duct=20548

\\m//

[Ypedal]

UPS guy arrived this morning !!!!

[Ypedal]

All 6 cells , in all 6 packs are showing 3.810v to 3.820v on arrival !!!...

Topping them all off as i type this..

[Ypedal]

4 packs ballance charged, at 1C ( 4.5 amps ), and discharge at 100v from a portion of my lightbulbs at 5.25 amps, while the last 2 packs ballance charge.

I also received my Lyen 18 fet controller.. more on that shortly !

[Ypedal]

An honest 4ah ! ( From 4.5ah cells ) from cycle 1.

I dont like to deep discharge packs, but it's the only way to know what's in there and prevent an overdischarge on the road.. weakest cell dropped to 3.455v at the 4.0 mark all others at 3.5xx wich is just awsome.

[Ypedal]

pack remained cool ( room temp is 23c , comfortable vacation weather !! ) .. up to the 3ah mark, and slowly got warm to 4ah when i pulled the plug.. outside pack temps 36c

[Doctorbass]

pack remained cool ( room temp is 23c , comfortable vacation weather !! ) .. up to the 3ah mark, and slowly got warm to 4ah when i pulled the plug.. outside pack temps 36c

Great!!

I guess you feel really happy now

Just to let you know, the lithium cells dont like to be discharged too low because of the heat that they produce when at the end of discharge when their RI is increasing. But the nanotech are very low RI compare to other lipo cells so no worrie about low discharge to 3.00V. You will not reduce their cycle life by discharging them to 3.00V... it will only happen if you leave them too much time at low or high state of charge.. ex 3.00V or 4.20V



Doc

[Tommy L]

I also received my Lyen 18 fet controller.. more on that shortly !

I ordered my 18Fet4115 from Edward a few days ago. I can't wait!

Which 18fet did you order? and on the Nano's!

Tommy L sends... \\m//

[Sacman]

An honest 4ah ! ( From 4.5ah cells ) from cycle 1.

Your capacity should increase with a few more charge/discharge cycles.
IIRC most people are getting slightly greater than 5ah on the regular 5ah Turnigy cells.
And you're using the NanoTechs (supposedly higher grade cells)

[Ypedal]

I dont run a BMS on any of my packs, so i always stay well above available capacity on any given ride.. in this case.. 4ah is the " quit using throttle and pedal " mark !

So finally, yesterday, out with the old !!

[Ypedal]

I love working with aluminum, light, easy to cut, drill and bend..

kmx41.JPG (57.05 KiB) Viewed 139 times

Cut a piece and bolted it to the controller..

kmx42.JPG (53.61 KiB) Viewed 139 times

Then using the existing holes in the frame that were available for the cable mounts ( that broke during assembly ) ..

kmx43.JPG (48.78 KiB) Viewed 139 times

I try to always add some tape between brackets and frames, keeps things quiet and protects paint..

kmx44.JPG (63.18 KiB) Viewed 139 times

[Ypedal]

Going to be a short run between the motor and controller..

[Ypedal]

Changed the half-grip twist throttle for a thumb type, with 100v 60+ amps on tap i really dont want accidental power usage...

So i drilled a hole at the bottom of the steer tube and fed a guide wire ( weed wacker line ) to fish the throttle cable thru from the top of the tube, cleaner look.

[Ypedal]

And then back to the kitchen workshop area, got the throttle cable extended (was 18" too short to reach the controller.. argh..

sorted out the motor/controller phase hall wire combo colors .. tested the 3 speed switch.. all working !!..

Today i assembled the 6 nano packs for 18S 2P fun, and i just ordered another 7 packs from the china warehouse (the US warehouse was out of stock.. ) it will be 24s 3p (100v 13.5 ah ) when all the packs get here.

[Tommy L]

Hi YPEDAL!

Going orange......

The Great Canadian Kitchen Party!

Tommy L sends..... \\m//

[Ypedal]

Ok... Just got back from my first ride using the 18fet at 18S ( 72v ) and aprox 60 battery amps showing on the Standalone CA !!!

Hell yeah this is FUN.... I predict tires and brake pad life are going to be short lived.. ( on grass or dry dirt it breaks traction and fishtails real nice.. )

Pictures to come, got the battery pack solidly mounted, no more vric vrac rattles !!!..

Also on the agenda, figure out how to enable and use Regen on these things.

[Ypedal]

backtracking a bit..

earlier today, cut some ABS plastic pieces...

kmx48.JPG (50.76 KiB) Viewed 296 times

Since i only have 6 packs at the moment, i'm running 2 in parallel ( 2P ) and then 3 of these in series for a total of 18S , 2P..

Using clamps, i applied pressure to the packs then with filament tape secured them tightly together in pairs.. then stacked them 3 tall staggered..

kmx49.JPG (65.44 KiB) Viewed 296 times

Looks sketchy, but for testing purposes , it works.. having learned the hard way i no longer waste time making everything perfect prior to road tests... nothing worse than spending hours shrink wrapping , zip ties, etc... only to find out you got a problem and have to tear it all up ..