mystryda wrote:So here are my questions:
1. I'm concerned with efficiency because of size/weight/cost of batteries. Do I understand correctly that the Bafang CST wins hands down in terms of efficiency, or am I missing something in my analysis of the simulations?
2. The Bafang CST and MAC 8T both weigh double that of the Q100 CST. Is the efficiency worth the weight hit?
3. How can I interpret the graphs to tell what happens when I pedal? This one really has me stumped!!
--Me adding 200W to the 400W of the motor puts the speed at about 28 mph.
--If I look at the graph of the Bafang CST at 400W, for example, then 28 mph is extremely close to the no-load speed/0 amps expended, so that doesn't seem to make sense.
--Is there a way to accurately simulate what happens when I add 200W of pedal power?
4. Aside from the difference in cost and weight, why pick of these hubs over another? Or why not pick the Bafang CST?
5. I'm planning on pedaling up to the teens before engaging the motor, and I can treat the system gently (I just changed the original front brakes pads on the Odyssey at 106k.) However with commuting 12,000 miles annually reliability is a huge concern. Thoughts about reliability given these simulation results?
Thanks!
I'm concerned with efficiency because of size/weight/cost of batteries. Do I understand correctly that the Bafang CST wins hands down in terms of efficiency, or am I missing something in my analysis of the simulations?
Aside from the difference in cost and weight, why pick of these hubs over another? Or why not pick the Bafang CST?
. I'm planning on pedaling up to the teens before engaging the motor...
d8veh wrote:The Q100 is nice and light, but You'll kill it running it at 52v and 20A. Even 48v and 20A will wear the gears rapidly with a light rider and bike.
d8veh wrote:I'd say that the two motors you should consider are the Q128C from BMSBattery and the Bafang SWX02C. Both weigh just over 3kg and will handle 48v at 20A.
melodious wrote:Why not a mid drive like BBSHD? Gearing it for the amount of power & speed he wants is super simple, just put a big 48+ tooth front gear. The speedo PAS would be more intuitive to his pedaling.
neptronix wrote:The mac on the simulator has the old 0.5mm lams.
neptronix wrote:The newer eZee motors are similar and will give you a good approximation of what the performance of a new MAC is like, although i believe they are less powerful than the MAC.
mystryda wrote:I appreciate the suggestion, and I had originally been leaning towards a BBS02, but given the high mileage (50 miles/day, 12k+/year) I've been advised that mid drives come with considerable concerns with regards to reliability and maintenance (time and part replacement costs).
mystryda wrote:I had looked at the "eZee 350 rpm" initially, but it didn't seem to do as well as the others in simulation in terms of efficiency as well as headroom. Here's what I put in:
I'll do some more reading on the MAC 8T, though. Do you know when the new version came out or how it's different?
mystryda wrote:So here are my questions:
1. I'm concerned with efficiency because of size/weight/cost of batteries. Do I understand correctly that the Bafang CST wins hands down in terms of efficiency, or am I missing something in my analysis of the simulations?
2. The Bafang CST and MAC 8T both weigh double that of the Q100 CST. Is the efficiency worth the weight hit?
3. How can I interpret the graphs to tell what happens when I pedal? This one really has me stumped!!
--Me adding 200W to the 400W of the motor puts the speed at about 28 mph.
--If I look at the graph of the Bafang CST at 400W, for example, then 28 mph is extremely close to the no-load speed/0 amps expended, so that doesn't seem to make sense.
--Is there a way to accurately simulate what happens when I add 200W of pedal power?
4. Aside from the difference in cost and weight, why pick of these hubs over another? Or why not pick the Bafang CST?
5. I'm planning on pedaling up to the teens before engaging the motor, and I can treat the system gently (I just changed the original front brakes pads on the Odyssey at 106k.) However with commuting 12,000 miles annually reliability is a huge concern. Thoughts about reliability given these simulation results?
Thanks!
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