Interested to read this thread as we have just completed an electrical conversion to a Quattrovelo 4-wheel velomobile (originally from the same Dutch company who make the Quest and Strada) I've been riding it unassisted for over a year including some long European tours but unfortunately I now have a long term health problem which randomly affects my lung function making hill climbing a problem. The setup was designed by a French friend who has been using a similar setup on his QV for the past year and a half with no problems. The motor is a Smart Pie (Chinese) hub motor mounted in a rigid frame in FRONT of the pedals and drives via short chain to a chainwheel on the LEFT side of a modified Schlumph Mountain drive bottom bracket with NO increase in Q factor. (we think this is the first time anyone has done this) I wanted to keep the MD in case any malfunction ever occurs requiring me to pedal slowly home via the many steep hills I regularly encounter. The QuattroVelo has TWO wheel drive to the rear wheels using a Trykit double freewheel (instead of a differential) and an SRAM 10 speed derailleur setup giving a total of 20 gears with a very large range of ratios. Electrically, the motor is driven by a GRIN 25A controller and Cycle Analyst ver 3. It has inputs from a right wheel speed sensor, handle bar throttle , and chain idler mounted cadence sensor. Initially I just setup a profile with a 300W power limit and no other restrictions for testing- it works extremely well (too well in fact!) but now I need to create a profile that comes closer to the UK ebike rules (in particular max assisted speed 15.5mph (25kph) and 250W max output). Even at the "illegal" initial settings the efficiency is amazing - on a ride with avg speed of 22mph over 36 miles and max (pedalled) speed of 56 mph the battery use was only about 90w/hr ! (The battery is a 48V 21 aH unit, so I could ride all day at those settings)
I have been playing about with the CA limitations to legalise matters- I set a power max of 270W and speed limit of 17 mph initially but using this setting I notice that the instantaneous power never seems to go above about 180W with max throttle-- not sure why? (Making hill climbing assist less than optimal) I haven't activated the cadence sensor yet. The max assisted speed seems to work fine with the assist tailing off around the legal max of 15.5mph. I don't really understand the various throttle gain adjustments so at present these are left at defaults. Any suggestions will be most welcome.
Last edited by Warekiwi
on Apr 04, 2018 1:12 pm, edited 1 time in total.