ElectricMotorcycleForum.com

Hi Everyone

Its been a while since I posted as the build hasn't really progressed as fast as I would have liked. I'm able to put a bit more time into it now and have managed to pull the 4th episode together for anyone who might be interested. This one may have a bit more appeal as I've used a Motogadget mo.unit blue for body control, and a Motoscope Pro for the digital dash. Happy to answer any questions on how I made these work if anyone is looking to add one of these to their builds.

Anyway, this latest episode finished up all of the bench testing, so all of the bits will now start coming together - and hopefully resemble something rideable by the end of the year. I've also started to CAD up the frame and battery to design out the housings. Nothing quite like trying to recreate a frame in CAD without a 3d scanner!

Here is the episode for anyone interested:

For those looking for cheap batteries.   I often get a LOT of decent/ read really good condition batteries from places like the Batteries Plus stores.  Hospitals and other critical demand places have to change their batteries out on their Defibrulators / Cardiac maches and other critical equipment every few years at most, whether it's good or not, CHANGE IT.  They take the batteries to these stores to get rid of them.  So you have access to lightly used, WELL taken care of Lithium batteries, for essentially free.

They don't always have the LiPo's but DO have a lot of higher ampere hour demand Ferro chemistries, so unless you need a ton of amps for the bike for blistering speed, one of these might work super well for you also and are typically rated for stupid like 5 to 8 k cycles from the manu.

Just talking out loud, might help you find batteries if you need to get some to play with / test your bikes with.   Invariably they get boogered up every now and then, and it's nice to have a source of cheap replacements.

Aaron

Thanks for the info. This is an interesting option that I never knew existed. The challenge may be getting enough cells of a similar type/size to make larger packs that can be balanced. That said, if they are consistently "lifed" then its likely that cells of the same type would have similar remaining performance. If the price is right and you are able to match a stack of them up then this could work really well.

Honestly, with the quality of the video production and the way you present I would never have thought you'd only been doing this a few months and had 30 odd subscribers. Hopefully that number goes up steadily, with the effort you put in you deserve it and more people should see it. I'm glad you're going through the effort to get it road legal too so it can really be enjoyed.

Thanks again, that's really motivating RE the videos. A road legal EV conversion is something i'd been wanting to do for years and finally decided to try it since the cost of suitable batteries is now workable.

Hi everyone

I just joined the forum today after checking out some of the other posts.

I started building an EV conversion recently using a 1981 KZ440 LTD cafe racer as a donor and have made some decent progress over the last few weeks. The drive system is now together and on the bench and I’m about to start the 12v wiring and the battery box fabrication. Just wanted to share what I’ve done so far as I’ve gone through a bit of pain in some areas and it may help other builders, plus I’ll have more questions so hoping to tap into some knowledge.

Overview for the conversion:
-1981 kz440 ltd with ktm duke 390 front end
-Custom adapted duke 390 brakes
-17” 8kw QS hub motor driven by a Kelly Controller
-24s NMC lipo pack @ 7.4kWh
-Thunderstruck tsm2500 charger with dilithium MCU, BMS and SOC meter
-Vicor 400W switch mode dc-dc converter
-8Ah antigravity 12v battery
-Motogadget mo.unit blue
-Motogadget motoscope pro

EST weight at ~140kg





I also put some videos together for the build if anyone is interested in checking them out. I ended up doing something a bit different with the drivetrain power so it may be of interest to some. The videos are a bit cringy as it’s my first attempt at anything like this so excuse the bad acting and terrible voiceover