Differences between FSESC4.20 and FSESC6.6 | Flipsky

Many people have asked: What is the difference between your vescs 4.20  and vescs 6.6 ? Why the later is more expensive than the former?.

Now, here’s the answer:






MAX Speed


3S to 13S LiPo

Max 50A




Peak 240A


3S to 13S LiPo

Max 60A




Peak 150A


1.Voltage range

V4:8V-60V (3S to 13S LiPo)

V6:8V-60V (3S to 12S LiPo)

However, we suggest to use our FSESC under 55V, because the VESC tool is auto-disconnect when you set up to 57V (if you're choosing vesc_default.bin)


V4: max current 50A, peak current 240A

V6: max current 60A, peak current 150A

 This is the main big spec difference between them. so if you're not using so much higher current, V4 is a good option due to it's far more cheaper than V6.


Power = voltage * current

V4 power: 50A*60V=3000W

V6 power: 60A*60V=3600W



The current FSESC based on V4 is 2-shunt (2 manganin resistors), while the current FSESC based on V6 is 3-shunt (3 manganin resistors). Therefore, the current sampling accuracy of V6 is higher without any current ripple.

VESC6 has a smooth linear acceleration from 0 to full speed, mainly because it uses three shunts. (The VESC6 has a smooth linear acceleration from 0 to full speed, and this is mostly because it uses three shunts.)


5.Speed limit:

Rotation speed (ERPM) = motor speed (RPM) * motor pole pairs

The limit speed of V4 : 60000 ERPM

The limit speed of V6 : 150000 ERPM (the limit speed of 200A high current ESC is also 150000 ERPM)


Remark: The difference between RPM and ERPM:

If your motor has 14 magnets installed, your motor has 7 pole pairs. In this case, the RPM limit of your motor is the ERPM limit divided by 7.

Example: 7 Pole Pairs in motor, ERPM limit set to 70000 >>> RPM = 70000/7 = 10000 RPM.)


So the conclusion can be drawn: if you are a newcomer, then V4 is enough. But if you are a speed seeker, then V6 will be more suitable. See more escs


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