Hi all,
I'm considering doing a minimalist ebike conversion using the G310 kit from Grin:
https://www.ebikes.ca/shop/electric-bicycle-kits/bafang-g310-311/rear-g310-kit-basic-throttle.html
The kit comes with a 20A controller, and I was planning to do 2 x LiGo batteries. Each LiGo can handle 10A peak, 5A continuous. My usecase is to be riding motor off 90% of the time, and only give a light boost on 2-3 hills on my commute, at about 60% throttle for no more than 30-60 seconds at a time.
The Grin motor simulator says that with my weight, on the grade of hill I will ride, with me putting in 150w of human power, the motor will output produce about 207W which at 77% efficiency gives a 7.4A current draw at the battery. That is well within spec for 2x LiGo.
I went in to Grin in person (I live in Vancouver) and spoke to them about my plan, and they felt I would need 3x LiGOs. They said I would wear out the cells with 2x because the 20A controller would draw that much most of the time when climbing a hill, and even 30 second burst is considered "sustained" use.
Now I'm not sure what to believe. It doesn't seem physically possible to me that the motor could be drawing 7.4A but the controller is drawing close to 20A.
I don't think I would ruin the battery packs using them as I intend to. Obviously I could wreck them by trying to climb big hills without pedaling, but my usecase is hit the hill fast with momentum, keep pedaling hard, and apply a bit of thumb throttle for a short burst to take the edge off the hill.
Thoughts?
I'm considering doing a minimalist ebike conversion using the G310 kit from Grin:
https://www.ebikes.ca/shop/electric-bicycle-kits/bafang-g310-311/rear-g310-kit-basic-throttle.html
The kit comes with a 20A controller, and I was planning to do 2 x LiGo batteries. Each LiGo can handle 10A peak, 5A continuous. My usecase is to be riding motor off 90% of the time, and only give a light boost on 2-3 hills on my commute, at about 60% throttle for no more than 30-60 seconds at a time.
The Grin motor simulator says that with my weight, on the grade of hill I will ride, with me putting in 150w of human power, the motor will output produce about 207W which at 77% efficiency gives a 7.4A current draw at the battery. That is well within spec for 2x LiGo.
I went in to Grin in person (I live in Vancouver) and spoke to them about my plan, and they felt I would need 3x LiGOs. They said I would wear out the cells with 2x because the 20A controller would draw that much most of the time when climbing a hill, and even 30 second burst is considered "sustained" use.
Now I'm not sure what to believe. It doesn't seem physically possible to me that the motor could be drawing 7.4A but the controller is drawing close to 20A.
I don't think I would ruin the battery packs using them as I intend to. Obviously I could wreck them by trying to climb big hills without pedaling, but my usecase is hit the hill fast with momentum, keep pedaling hard, and apply a bit of thumb throttle for a short burst to take the edge off the hill.
Thoughts?