DIY Electric Car Forums banner

1 - 6 of 6 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter #1
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!
 

·
Registered
Joined
·
197 Posts
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.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #3
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.
 

·
Registered
Joined
·
5 Posts
Discussion Starter #5

·
Registered
Joined
·
136 Posts
I have the Dnepnr with the ME 1003. I will be transitioning to an AC-30.
The little ME 1003 performs pretty well. Just a note, it may be my bike (older '83 MT-16) but I wouldn't want to go anywhere near 70 mph on it. 45 to 50 seems scary enough. The newer Ural's may be more refined machines but sidecar dynamics may be a limiting factor as far as speed.
 
1 - 6 of 6 Posts
Top