I've been planning on doing a 3000w cyclone build for some time now, and finally got started... though still waiting on Luna to get the kits back in stock (Haven't found any other similar kit that I would want, here in the US).
I started working on my initial battery. I realized that 95% of my use of this bike will be short trips, mostly under a few miles round trip, and I live in an apartment building without an elevator... luckily only 1 flight of stairs up... but trying to keep the bike as light as possible (I actually own a production a2b ebike that I got for a good price in almost new condition, but I never use it since it's such a PITA to carry up/down the stairs... gonna see if I can sell that very soon). My plan for the battery is to gut a few Bosch 18v 6.3 ah battery packs that have Sanyo 20700A cells (30A 3100mAh cells) to create a 20s2p battery. I'm hoping that it will be able to give me the power I want.. never thought I'd be able to run a 72v battery this small, but with these 30A cells, I'm hoping it'll do that trick, if not I'll probably try 20s3p... or possible just run 2 x 20s2p packs in parallel. What's even more incredible is, with a 20s2p pack, I can utilize the bosch packs current layout and benefit from the plastic holder that's supposed to be some kind of cooling plastic, as well as the already laser welded copper plates. A 20s2p pack is essentially just 4 Bosch batteries in series, and at 72v, to get 3000w of power, would only need ~42 amps... which should be possible with these 30A cells.
The bike I plan to put this motor on is a beauty... it's currently a single speed mountain bike with a steel frame from Spot bikes, with a 73mm bottom bracket. It also has a Chris King headset,a s well as Chris King front and rear hubs... disc brakes, among a bunch of other really nice hardware. The Single Speed is once concern... I think it should make installing the Cyclone a little bit easier, but considering it's a mid drive kit that would normally benefit from rear gears... I'm not sure how well it's gonna run with just 1. My current plan is to install it an find out for myself... I live in a very hilly area (one reason I really want a good ebike for day to day use). I figure if I need gears, I'm going to look into a Internally Geared Hub. If anyone has any recommendation here (especially from personal experience) that would be great. I would LOVE to get a Rohloff, and it's not off the table yet, but obviously they are not exactly cheap... so I wanna see what other options there are out there that can handle this kind of power... I know there's a 3 speed Shimano that might do the trick.
I still have a few more decisions I need to make regarding this kit, and add-ons, and was hoping to get some advice from people who have more experience with this setup than I do.
First off, I have a 73mm bottom bracket, should I go with the square taper or ISIS BB/cranks? (It seems like the general consensus is that the ISIS is a little more heavy duty, but I've heard people going both ways on this, so would love for someone to confirm which one is the better choice)
My current plan is to get the upgraded 50a Kelly controller from Luna (I assume this makes sense, tho please chime in if not)... and I also want to get a Cycle Analyst for my primary display and to make adjustments while riding.... anyone know if this controller has the 6 wire CA connector already? (if it doesn't, I plan to open up the controller to add one... hopefully that's not too hard... luckily electronics and soldering is something I am very far from new at, so should be something I can handle pretty easily)
I still have lots of research to do on this build. Need to find a good BMS for a 20s battery pack (Tho have been seeing videos/posts on people recommending not to run a BMS, and to split the pack into 2 x 10s packs and simply use a 10s lipo balancing charger.... But I'm still leaning towards finding a good BMS and likely buying a Cycle Satiator charger, that way I'll have 1 charger that can handle any number of ebikes, etc. in the foreseeable future... not to mention be able to extend battery life by charging to 80-90%, etc.) Would love to hear peoples opinions here, also if you can recommend a high quality BMS, please do... I am not concerned with saving money on an economy BMS... would rather have one that will extend the life of my battery as well as one that I can depend on doing its job correctly and not have to second guess it.
I'm also aware that there are some common mods people do to this Cyclone motor, primarily to it's mounts to strengthen things, and prevent flex. Sadly most of the posts I've seen on this were old and the photos were all gone (making the descriptions basically 100% useless).. if anyone can point me in the right direction with these mods... please do.
Anyway, I'm sure I'll have more questions... and will be doing as much searching/reading as I can to research more on this build... but would really appreciate any advice people can give me... whether it's opinion or fact... both are more than welcome. And thanks in advance for the help!