Sabvoton 7280 vs cheap kt 45a Controller

[Ls6s]

hi guys, a question for those who know about controllers, I have always used KT controllers for years and was quite satisfied, but unfortunately they hardly have anything with a lot of power so I looked for better controllers (Sabvoton) then I noticed how weak a Sabvoton 80a is compared to my KT 45a, when a KT 45A accelerates it makes a wheele every time and the pressure is crazy but this one sabvoton falls asleep, it is so weak in acceleration compared to a kt controller with only 45a Maximum amps , now I understand how people drive 150a and 200a and complain that it's not enough power, I've always wondered, how can that be?

 

[stancecoke]

how can that be

Kunteng: 45 amps battery current.
Sabvoton: 80 amps motor current.

With the Kunteng you have no idea, how much motor current is provided, it's not documented anywhere. It's a matter of the firmware to which value the maximum motor current is limited.

battery current = duty cycle * motor current

torque = motor constant * motor current

power = torque * rpm (*2Pi/60)

Especially at low rpms the motor current is much higher than the battery current.

regards
stancecoke

 

[E-HP]

hi guys, a question for those who know about controllers, I have always used KT controllers for years and was quite satisfied, but unfortunately they hardly have anything with a lot of power so I looked for better controllers (Sabvoton) then I noticed how weak a Sabvoton 80a is compared to my KT 45a, when a KT 45A accelerates it makes a wheele every time and the pressure is crazy but this one sabvoton falls asleep, it is so weak in acceleration compared to a kt controller with only 45a Maximum amps , now I understand how people drive 150a and 200a and complain that it's not enough power, I've always wondered, how can that be?

Depends on your setup and configuration. My KT controller was fine and I loved it. It wasn’t until switching to other controllers that I noticed it was really tame when it came to acceleration. Nice otherwise, but not a lot of grunt. My current controller is a clone of the 7280. It accelerates my bike and motor to 40mph in 5.9 seconds, so not the slug you describe. It’s dangerous without reducing the throttle ramp way down to keep from flipping over backwards.

 

[Ls6s]

Kunteng: 45 amps battery current.
Sabvoton: 80 amps motor current.

With the Kunteng you have no idea, how much motor current is provided, it's not documented anywhere. It's a matter of the firmware to which value the maximum motor current is limited.

battery current = duty cycle * motor current

torque = motor constant * motor current

power = torque * rpm (*2Pi/60)

Especially at low rpms the motor current is much higher than the battery current.

regards
stancecoke

No, the sabvoton is officially specified with 80a max dc current and 200a max phase current, you can read about it

 

[Ls6s]

Depends on your setup and configuration. My KT controller was fine and I loved it. It wasn’t until switching to other controllers that I noticed it was really tame when it came to acceleration. Nice otherwise, but not a lot of grunt. My current controller is a clone of the 7280. It accelerates my bike and motor to 40mph in 5.9 seconds, so not the slug you describe. It’s dangerous without reducing the throttle ramp way down to keep from flipping over backwards.

OK, strange, maybe I'm wrong with the setting, but when accelerating the KT is immediately there with full power, the sabvoton reacts a little slower and with significantly less punch

 

[stancecoke]

200a max phase current, you can read about it

But what have you set in the tool?!
https://endless-sphere.com/sphere/t...or-mqcon-sabvoton-like-80a-controller.108179/

After i seted up to 53V and 20A limit it works like a rocket.
Power consuption now near 5kW and always want to lift the front wheel when pull full throttle