Emax BLHeli 30A Oneshot ESC for Brushless Motors, 2-4S
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Prices updated: 13 Oct 2026
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About this product
An Emax BLHeli series electronic speed controller rated for 30A constant current, with Oneshot protocol support. It works with 2S to 4S LiPo batteries and provides a 5V, 2A BEC output to power the receiver or flight controller. Used to drive brushless motors in multirotor drones and similar projects.
Specifications
- Constant current
- 30A
- Burst current
- 40A (up to 10 sec)
- Input voltage
- Up to 16V
- BEC output
- 5V / 2A
- Suitable batteries
- 2 ~ 4S
- Protocol
- Oneshot
Frequently asked questions
How do I wire the ESC?
Connect the battery leads to the main power inputs, the three ESC outputs to the motor, and the signal wire from your flight controller or receiver. Share a common ground between the ESC and the controller. Confirm the signal protocol is supported by your controller.
Is the 16V input limit enough for 4S batteries?
A fully charged 4S LiPo can reach about 16.8V, which is above the listed 16V limit. Use 3S batteries or confirm the ESC's voltage margin before running a fully charged 4S pack.
