These bikes don't have as much power at lower charge %

[snowbro]

I have noticed this a few times and tested. I have a couple Levo's right now (2017/2018) Carbon comp and regular comp. When the battery is freshly charged to 100%, it delivers a significant amount of power. When it gets under 50% charge, it feels like it has at least a 30% reduction in power, regardless of the mode its in. Basically, when its fully charged, the trail mode un-tuned feels like turbo does when its around 30-50% battery.

Anyone else noticed this? I wonder if they have some algo that gradually reduces output to save the battery somehow. idk.

 

[knut7]

On a 36V system, the battery cells are fully charged at 42V and empty at 32V. Some claim the ebike motors can produce up to ~750W. 750W/42V=18A. So let's assume the systems are limited to 20A.

20A*42V=840W
20A*37V=740W
20A*32V=640W

Sure, the controller/bms could be limiting the max power output to say 750W. Then you will not notice any difference between 100% ang 50% state of charge. But at 20% the power will be significantly lower.

It's possible to make a system that will give the same ammount of power at 100% and 10%, but that will result in a massive draw of current at low charge. It will require a big/heavy/expensive battery to handle that, especially at low outside temepratures (<10*C). So I don't think any of the manufacturers want to design the bike this way. It's a compromise between power at low charge and keeping the battery weight/cost down.

 

[snowbro]

On a 36V system, the battery cells are fully charged at 42V and empty at 32V. Some claim the ebike motors can produce up to ~750W. 750W/42V=18A. So let's assume the systems are limited to 20A.

20A*42V=840W
20A*37V=740W
20A*32V=640W

Sure, the controller/bms could be limiting the max power output to say 750W. Then you will not notice any difference between 100% ang 50% state of charge. But at 20% the power will be significantly lower.

It's possible to make a system that will give the same ammount of power at 100% and 10%, but that will result in a massive draw of current at low charge. It will require a big/heavy/expensive battery to handle that, especially at low outside temepratures (<10*C). So I don't think any of the manufacturers want to design the bike this way. It's a compromise between power at low charge and keeping the battery weight/cost down.

Great explanation, thank you