[timbillyosu]

Similar to a few others here, I am planning a motorcycle with a sidecar conversion to an EV. I am still in the early stages and looking for a bike. I'm trying to plan out what all I will need.
So far, here are the specs I have considered:
Total vehicle weight: 1,100 lbs (fully loaded with 1-2 riders)
Desired max speed: 70 mph
Desired range: 50 miles ( I commute 25 miles each way, but my boss has said the company will provide me a way to charge it here)

Based on that, I am thinking about a 72V, 100 Ah setup. What size motor should I be looking for? The stock Urals weigh 750 lbs unloaded and have a 42 HP motor so I was thinking that I want at least 50 HP.

I would like to stay under $5k for the project. I will be doing all of the wrenching and wiring myself. I am a mechanical engineer with a lot of fabrication and machining experience. I also work with a few EEs that have offered to help once I get into more of the wiring and programming aspects.

Thanks for the help!

 

[timbillyosu]

Rather considering the ICE's peak power and the motor's continuous rated output, consider your ICE's power curve.

When accelerating, your power would be lower just after a gear change and highest near your shift point, which probably isn't at redline. Look at the power output in the middle of that revband. This may give you a more realistic ballpark for your motor spec.

That's a good point. Just out of curiosity, what size motor would output about 50 HP anyway? I'll have to look and see if I can find a power curve for the Ural's 750cc. If not, I don't see a problem with having a bit more power because I know with all the batteries and all this thing will probably be HEAVY.

 

[timbillyosu]

HPEVS AC-20 is rated for 47 HP, and is about 15"/37cm from the tip of the shaft to the other end of the motor, about 7" diameter, 27kg.
http://www.evwest.com/catalog/product_info.php?cPath=8&products_id=339 3k USD new.

These EVMCs are rated waaaay lower, 3-10kw:
https://www.goldenmotor.com/eMotorcycle/frame-emotor.htm

What about this kit?
http://www.thunderstruck-ev.com/curtis-ipm-system.html