wanders wrote:If you go 20s8p, based on 18650 cell dimension, you may be able to fit it into the triangle, but it depends on your frame size. I am doing a similar project, but it is not clear how our bikes compare in size. My "CAD work" is based on simple scaled photos and Visio drawings, but it works OK. I can fit 20s8p into my triangle with no sweat, or 24s8p with no margin. My frame is a Raleigh Ram XT 2500, which is similar in configuration to the Kona (here is the catalog shot):
BTW, doctorbass has an excellent thread on building LiMn packs which is germane to this discussion.
patrickza wrote:How are you planning on mounting the batteries?
pwbset wrote:Mhm... can't believe I missed this thread! Hi Patrick.. I fly paragliders also (most recently I flew a Skywalk Tequila)! I've always wanted to go fly Table Mtn in your neck of the woods there.
Drunkskunk wrote:Welcome to the site.
Thats a good looking doner bike. I'm running a Kona Stinky Myself, which is the same design with beefier componants. the frame isgreat for batteries.
have you considered Lipo over limn? hobbycity.com has some great (read that cheap) deals on RC grade Lipo packs. 4 packs of 18.5v 5ah cells fit easily in a frame bag sold by Ebikes.ca
I'm working on a custom bag like the one you drew out ...wait, almost exactly like ... have you been spying?
Seriously though, I'm putting together a hard framed bag, it will be bolted and strapped on, and hold the cells ridged, but have cloth sides for stealth. I should be able to get 720 watts of battery in there with room for spares, tools, and the occasinal sandwich.
mikebikerad wrote:Nice Kona! You chose a great project bike especially with the rim brake bosses on the back making a rear hub install easy.
I have a kikapu and a stinky that I am converting right now. One is 72 volt 15amp/hr and the other is 60 volt 20 amp/hr. I would highly recommend using a Lithium iron phosphate battery. Honestly, I think that I have done some electronically horrific things to my batteries and they never stop.
mikebikerad wrote:That will be very nice! with 10 amp/hr you will be pushing the limits going 20 miles.
Sacman wrote:Wow! I'm really liking that battery box patrickza. That's SCHWEEEET!
You gotta spill the beans on where you got that made. Is there a cover to it?
So did the BMS wiring connections work out for you?
Mark_A_W wrote:I'm very interested to see how this Kona frame holds up.
I have a very similar frame - a Kona Dawg, and I am quite frankly too scared to fit an X5 motor to the rear swingarm. There is not a lot of meat around the main pivot (near the cranks), at least on my bike.
I already broke the rear swingarm on a Jamis Dakar...and the motor was on the front wheel!
These swingarms are not meant to carry an extra 10kgs...
Mark_A_W wrote:Adding extra unsprung weight increases the load on the pivots. There's no way around that - when the wheel moves up (or down) and is stopped by the shock, the forces are reacted through the main pivot.
If your bike holds up I may try a heavy rear motor on mine, but I don't want another swingarm failure at 45km/h (although the last one was surprisingly uneventful, I don't want to push my luck..)
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