Piaggio Boxer EV (1971/2011) - version 4.0

[nasukaren]

I hadn't posted pix of my Boxer EV for a while, especially not after getting Prius packs and a new motor. Full details are on my website here (http://gpsy.com/ev) including the bill of materials, but here's some eye-candy for y'all:



Front side view, with new 9-watt LED which is blindingly bright:




This is the Prius pack mounted in the 6s2p configuration, given me 43.2 volts @ 13 Ah nominal. I made the battery carrier myself. The motor speed controller is below the pack, but it's hard to see from this angle:




This shows the new style HobbyKing motor mounted. The new motor was longer than the old one (even though the specs on HobbyKing's site weren't updated) which meant it could no longer fit in the old motor mount. I had to weld together my own motor mount. Right now, I'm holding the motor only on one side, leaving the other open for the cooling fan (made from a PC computer fan) - not that the motor spins counter-clockwise from this perspective, so the fan draws air into the motor. I think I'll eventually end up making a retention bracket for the right side as well, to prevent too much stress on the bearings on motor:




This left hand side shows how the motor was moved forward in order to fit:





Feel free to post questions here or on my blog (http://gpsy.com/ev)!

[pchen92]

Hi,

what are your performance ? Speed ? Range ?... ?

Very nice build

[nasukaren]

I posted full data on my blog, but max speed depends on the gearing. With the high gearing, I was going 50 kph (around 30 mph) and pulling 140 amps. That was a bit much for the little scooter, so I put a lower gearing on it that puts me at around 40 kph (25mph) and 100 amps.

My fuel efficiency is 45 Wh/km so with the dual Prius packs, around 8-10 kilometers conservatively (5-8 miles).

Karen
gpsy.com/ev

[vax]

That's too much...My chinese hub-motored scooter with 3.3W Kelly controller uses around 25A doing steady 50 km/h. And that with 10'' wheels and heavy SLA batteries...

[nasukaren]

The peak amps are during the acceleration phase. This thing accelerates really fast! I keep meaning to get one of the iPhone apps that can tell you how many Gs your vehicle can pull.

Once it gets up to cruising speed, the amps drop down drastically (I can't easily see the CycleAnalyst while I'm riding, but I'm guessing 40-50 amps). Actually, I guess I could back-calculate using the watt hours.......

45 Wh / km @ 40 km / h = (the km and the h cancel out) .... 1800 watts

1800 watts @ 43.2 volts = 42 amps



Karen