Review: DYS XS30A ESC

by Oscar

Testing our 2nd BLHeli_S ESC – DYS XS30A on the thrust stand.

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DYS XS30A ESC is available here.

Firmware and MCU

Biggest advantages of the XS series ESC’s is that they are running BLHeli_S firmware, and having hardware PWM. This increases motor smoothness and throttle responsiveness.

To run BLHeli_S, the ESC must have either a EFM8BB10 or EFM8BB21 Processor.

Same as the Aikon SEFM 30A, the DYS XS30A uses EFM8BB21 MCU. Some other BLHeli_S ESC uses EFM8BB10. The difference between the BB10 and BB21 processor is the clock speed of 24MHz and 50MHz. Because the dedicated hardware PWM unit offloads much processing off the MCU, we are still far from reaching the limit of 24Mhz, so clock speed isn’t a problem just yet. While there is little difference in performance between 24MHz and 50MHz, it’s good to have head room for future development.

dys xs30a esc wires cables

dys xs30a esc back pcb


  • Supports: 3S – 6S
  • 45mm x 16.5mm x 5.8mm
  • Includes BEC: NO
  • weight: 9g
  • Comes with plastic protective case

The XS30A is considerably larger than the Littlebee 20A in size, even than the Aikon 30A. And heavier because of the heatsink it has. (Aikon doesn’t have heatsink)

dys xs30a esc thickness heatsink dys xs30a esc size comparison aikon sefm littlebee 20a

Thrust Test

I tested the ESC with 2 different motors (DYS SE2008 2550kv, Tornado T1 2205 2600kv), also comparing the result with Aikon SEFM 30A.

DYS SE2008 2550KV Motor

Props   % Peak Thrust – g Peak Current – A Max Power – W Efficiency – g/W
Gemfan 5030 XS30A 50 350 4.3 69.7 5.02
    100 954 21.7 351.5 2.71
  Aikon 30A 50 341 5.0 81.0 4.26
    100 969 21.5 348.3 2.78
DAL 5040×3 XS30A 50 401 7.1 115.0 3.49
    100 1095 32.0 518.4 2.11
  Aikon 30A 50 424 7.9 128.0 3.31
    100 1045 33.1 536.2 1.95

BrotherHobby Tornado T1 2205 2600KV

Props   % Peak Thrust – g Peak Current – A Max Power – W Efficiency – g/W
Gemfan 5030 XS30A 50 370 5.6 90.7 4.08
    100 975 25.1 406.6 2.40
  Aikon 30A 50 382 5.5 88.3 4.29
    100 993 24.8 401.6 2.47
DAL 5040×3 XS30A 50 431 7.5 120.7 3.57
    100 1250 37.5 606.7 2.06
  Aikon 30A 50 463 8.1 131.1 3.53
    100 1197 36.3 587.7 2.04

This is not a very comprehensive testing i have to admit testing only 2 props on 2 motors, comparing 2 different ESC’s. From the data we can see that the thrust difference between Aikon and XS is within 5%. Aikon SEFM 30A seems to provide more thrust and power spinning lighter propellers (higher RPM). While the XS30A gives more thrust and power with heavier prop where RPM is lower. Same thing happened on 2 different motors.

Thrust data isn’t everything. I will put these ESC on a quad and try to find out the performance in real flight, smoothness and throttle responsiveness.

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Dick Gerritsen 10th February 2019 - 5:18 pm

Is there any difference between esc for racers or esc for larger multirotor.
I want to use the dys blheli 30a for 920kv (3s) motors, is that possible. Want to use them because they are slim and have lower weight. Hope to get answer.

Kindly regards from the Netherlands

Oscar 10th February 2019 - 10:10 pm

You can use ESC’s designed for racers for larger multirotors too, as long as the current rating is fine.

Tyler Walker 10th May 2018 - 9:03 pm

Will these escs handle a 2207 2400kv motor? Lotta power wondering if they can handle it

Oscar 14th May 2018 - 4:56 pm

yea 30A ESC can handle that motor just fine.

Eric 2nd February 2018 - 10:10 am

Hi there!
I have this exact ESC, on the sticker it says OneShot 42, I am confused and not sure if I can flash them with Multishot, I would like to know if possible to flash multishot firmware.
Thanks in advance!

Oscar 5th February 2018 - 2:44 pm

Please see this article: ESC firmware & protocols

lucmaimilien 28th August 2016 - 2:45 am

I wonder if these mini Esc can work fine also with large pancake slow motors , as T-Motor 4006 400Kv and big 16″ props.
They should but I have mount 6 Flycolor Raptor Mini 30A F330 ,, on my large hexa and have a bunch of strange problems.

One thing that let me very surprized was how much they get little hot.
I did a bech test with a constant 5A and variable 3-6A load for 20 minutes and starting with 31.8 ° temp the max temp reach after 20′ was 48° C .
In the last 7 minutes of test temperature was raising very slowly, just 1,2 ° C.
Amazing , mostly if you consider that I have put some mineral wool aropund the esc.

Oscar 3rd September 2016 - 1:37 pm

as soon as the current rating meets the requirement i think they should be fine.

Mootronic 11th August 2016 - 12:52 pm

I think a via is missing on one of the motors pads…

Oscar 11th August 2016 - 1:51 pm

what do you mean?
The ESC in the picture was tinned with solder on it as I tested it previously on the bench.