NFN01 said:
Hi All
New Member here. But Have been following this thread and the Programming thread.
I have just put a BBS02 750W on my KMX Venom recumbent trike. Power source is 48V 15Ah LiFePo4 with BMS split across the rear panniers.
Not fully installed yet. But have done 20 miles worth of testing and the battery indicator is still showing full. Had 30mph on 38T to 11T gear selection.
I have also got dual front chain ring setup. 48T-38T on a spider adapter with a 3mm spacer ring between the spider and motor output hub.
I have also got round the front derailleur not being able to reach the outer chain ring. When the bafang motor is fitted the BB
effectively becomes a 100mm BB with the final output gear housing being in the same position as the small chainring position on a triple setup.
So started looking at the fatbike market for a solution, and found a UK based company that makes a seatube bracket that
allows the fitment of the shimano high direct mount series of front derailleur mechs. The bracket moves the mech out further
to compensate for the wider BB on a fatbike. My problem solved.
This solution make not work on a normal DF bike. My chainline is not an issue so this works.
Got a programming cable so will start experimenting once the installation is fully complete.
In the new year plan to upgrade the rear transmission to a Nuvinci N360 with Harmony.
Hi all
Upgrade nearly completed. Running with N360 hub now, just awaiting fallbrook to sort out my harmony unit.
The BBS02 and N360 are working perfectly together, I only use the throttle so I have control of how much and when I need
motor assist. I can get the perfect balance of motor power/speed, pedalling power/cadence, and the right ratio to be in
for the riding conditions/terrain. I'm finding now I'm shifting regularly without even really thinking about it to maintain
a comfortable balance.
Also having the double at the front brings the n360s overall ratio range in excess of the rolhoff 14 speed hub. Despite having a fairly large over lap (38T/48T)
Top speed achieved so far is just under 37mph on smooth flat road cadence peaked at 106. (I couldn't pedal any faster without inducing serious pedal steer).
Iv'e also noticed I use a bit less motor than pre-hub days to the tune of about an extra 15 miles range on a charge. Increasing from the usual 50 miles to 65 or so.
The maximum uphill gradient I can climb is a 17% (1:5) on the 48T and full hub under drive. I haven't tried anything much steeper yet but would definitely have
to drop to the 38T front ring. It also runs and works great on off road trails
But overall the BBS02 is a great piece of kit if you are prepared to keep it regularly serviced and lubricated. I've now have a complete set of bearings and other motor internals.
And a spare controller. I have limited my controllers to 20A (A must) and trimmed the throttle settings to my preference. I don't use PAS at all.
Combined with the N360 it is an awesome ride compared to what it used to be. Hill climb shifting is now a doddle and no nasty noises from the rear end anymore.
Can't wait for the auto mode on the harmony system when it arrives.
I have also been given a dead 48V 500W motor (Controller failure, motor OK). I plan the de-pot the dead 500W controller and replace the MOSFETs with more beefy ones.
If I upgrade the MOSFETs to higher current rated ones, does anything need to be upgraded on the 500W controller PCB? (In other words can I convert the 500W to 750W by just upgrading the MOSFETs?)
And with the upgraded MOSFETs, can I up the current limit beyond the original 18A using the software?
Also can my spare 750W controller be fitted to and run the 500W motor?
My assumption is the 500W and 750W versions share the same motor but have controllers with different current rated MOSFETs. Am I correct?
Or does the factory shipped 500W have a software de-rated 25A 750W controller?
I will add a couple pictures of my heavily modified KMX to my next post.
Thanks in advance for any answers you guys can give
N
