---
product_id: 171204222
title: "QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs)"
brand: "qwinout"
price: "$78.66"
currency: USD
in_stock: true
reviews_count: 12
category: "Q Win Out"
url: https://www.desertcart.us/products/171204222-qwinout-2-4s-30a-rc-brushless-esc-simonk-firmware-electric
store_origin: US
region: United States of America
---

# 30A continuous current 2-4S LiPo compatible 3.5mm female banana connectors QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs)

**Brand:** qwinout
**Price:** $78.66
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your drone game with plug-and-play power and precision control!

## Quick Answers

- **What is this?** QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs) by qwinout
- **How much does it cost?** $78.66 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/171204222-qwinout-2-4s-30a-rc-brushless-esc-simonk-firmware-electric)

## Best For

- qwinout enthusiasts

## Why This Product

- Trusted qwinout brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Power:** Pre-flashed SimonK firmware means zero setup fuss—just install and fly.
- • **Seamless Connectivity:** 3.5mm female banana connectors eliminate soldering headaches and ensure reliable power delivery.
- • **Smart Safety Protocols:** Built-in arming safety, low voltage cutoff, and overheat protection keep your drone flying safe and sound.
- • **Robust Current Handling:** 30A continuous (burst up to 40A) supports aggressive multicopter builds with confidence.
- • **Precision Throttle Control:** Customizable throttle calibration and programmable settings for perfect responsiveness on every flight.

## Overview

The QWinOut 2-4S 30A Brushless ESC is a lightweight, compact speed controller designed for DIY multicopters and quadcopters. Featuring pre-installed SimonK firmware and 3.5mm female banana connectors, it supports 2-4 cell LiPo batteries with a continuous 30A current rating and advanced safety features like low voltage cutoff and throttle calibration. Ideal for millennial drone enthusiasts seeking hassle-free installation and reliable performance.

## Description

NOTE: 1. ESC was soldered with 3.5mm Female banana connectors, effectively avoid welding problems; 2. have set up the Simonk Firmware program.Brand: QWinOut Working current: 30A/40A (Optional on my shop) Output: 30A Version: Continuous 25A, Burst 40A up to 10 Secs 40A Version: Continuous 40A, Burst 55A not down to 10 Secs Input Voltage:2-4 cells lithium battery or 5-12 cells NiCd/NIMh batteryBEC:5V 3AMax Speed:210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM.(BLM: BrushLess Motor)Weight:about 25gCompatible for: DIY FPV KK MK MWC RC Quadcopter Hexacopter Multi-Rotor Aircraft;210 360 450 Helicopter;380 f450 f550 and other four-axis six-axis fixed-wing drone.Features1.Safety Arming Feature: Regardless the throttle stick position, the motor will not spin after battery connected.2.Throttle Calibration: Throttle range can be configured to provide best throttle linearity, fully compatible with all market available transmitters.3.Programmable Items:Brake Setting:brake enabled/brake disabled. Battery Type:Li-xx(Li-ion or LiPo)/Ni-xx(NiMh or NiCd). Low Voltage Protection Mode(Cutoff Mode):Gradually reduce the output power/Cutoff the output power. Low Voltage Cutoff Protection Threshold (Cutoff Threshold):low/medium/high. Start Mode: normal/soft/very soft. Timing:low/medium/high. Reset: reset all the programmable items to their default settings.4.Full Protection Features: Low voltage cutoff protection/Over-heat protection/Throttle signal lost protection. Suggestion:Do a throttle range adjustment before taking off as following steps:1.Connect ESC/motor/receiver2.Push the remote control throttle to maximum3.Connect power 4.Hear the regular sound of D- D- D……, unplug battery5.Reconnect power and hear DD quickly sound 6.Pull the throttle to minimum7.D sound once, calibration successful

Review: DON'T FOLLOW SELLER INSTRUCTIONS FOR CALLIBRATING - So when I first tried to use these they wouldn't work at all. My main problem turned out to be not having a common ground because I had different power sources for my Arduino controller and the ESC's/Motors. They all work great and don't seem to have any heating issues yet. Used with 935kv motors and 3S battery, working well so far FOR CALLIBRATING: 1. Have motor/reciever sending data 2. Throttle up to full 3. Power the ESC/Motor 3. You should hear 3 D's (means getting power) followed by 1 D (means getting HIGH signal) 4. Lower throttle to the minimum 5. You should hear 2 D's -- after that you should be good to throttle up
Review: Ok but tricky - I initially left a bad review, because after connecting this to an Arduino and trying to activate a motor with a basic servo sketch, it did nothing other than make the ESC beep. Then I did some more research and learned these ESCs have a startup routine needed to "arm" them, AND that I needed to power cycle the ESC after each Arduino update. After doing both of those, then my servo sketch worked.

## Features

- NOTE: 1. Since 2020.07.05, this items was soldered with 3.5mm Female banana connectors, effectively avoid welding problems; 2. We have set up the program, the ESC do not need additional program
- Input voltage:2-4 S; BEC: 5V 3A; Working current: 30A / 40A (Optional on my shop)
- Universal SimonK Firmware 30A/40A ESC Brushless Speed Controller, super simple. Small size combined with light weight for easy installation. (30A/40A is optional on my shop)
- Military standard capacitor of extreme low resistance increases the ability of prevention of unwanted RF noise during flying. Extreme low resistance PCB is helpful for getting a super current endurance capability.
- Microprocessor uses separate voltage regulator IC, with good anti-jamming capability.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07SFLJJQ5 |
| Best Sellers Rank | #324,435 in Toys & Games ( See Top 100 in Toys & Games ) #414 in Radio Control Vehicle Speed Controls |
| Customer Reviews | 3.9 3.9 out of 5 stars (194) |
| Item Weight | 4 ounces |
| Manufacturer | QWinOut |
| Manufacturer recommended age | 0 - 2 years |
| Package Dimensions | 6.22 x 4.57 x 1.3 inches |

## Images

![QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs) - Image 1](https://m.media-amazon.com/images/I/61w4S4NJEmL.jpg)

## Questions & Answers

**Q: My esc's only "d" 3 times and i can't get the esc to accept a throttle range adjustment, any help? should i increase the maximum of my pulse width?**
A: Brownout.

**Q: What is the maximum update rate? 50Hz? 400Hz?**
A: I update mine at 250Hz, 4msec.  Haven't tried going faster so don't know if 400Hz is possible

**Q: Is the BEC linear or switching in these?**
A: The BEC is a constant 5 V output You're running extra equipment on your airplane you might want to use an additional capacitor pack on your  Receiver

**Q: How do I program the brake?**
A: You set the break with the transmitter with the throttle stick and the paperwork for the ESC that it comes with will explain how to do so

## Customer Reviews

### ⭐⭐⭐⭐⭐ DON'T FOLLOW SELLER INSTRUCTIONS FOR CALLIBRATING
*by O***T on August 8, 2021*

So when I first tried to use these they wouldn't work at all. My main problem turned out to be not having a common ground because I had different power sources for my Arduino controller and the ESC's/Motors. They all work great and don't seem to have any heating issues yet. Used with 935kv motors and 3S battery, working well so far FOR CALLIBRATING: 1. Have motor/reciever sending data 2. Throttle up to full 3. Power the ESC/Motor 3. You should hear 3 D's (means getting power) followed by 1 D (means getting HIGH signal) 4. Lower throttle to the minimum 5. You should hear 2 D's -- after that you should be good to throttle up

### ⭐⭐⭐⭐⭐ Ok but tricky
*by C***S on April 9, 2025*

I initially left a bad review, because after connecting this to an Arduino and trying to activate a motor with a basic servo sketch, it did nothing other than make the ESC beep. Then I did some more research and learned these ESCs have a startup routine needed to "arm" them, AND that I needed to power cycle the ESC after each Arduino update. After doing both of those, then my servo sketch worked.

### ⭐⭐⭐ gets hot when powered and left idle likely due to poorly tuned drag brake feature.
*by T***T on July 15, 2025*

I got these escs for flitefest combat expecting them to be damaged during use. upon first powering them I noticed after only 30 seconds of being powered up (not even throttling them up) they were getting really hot to the touch, I unplugged them and let them cool down then calibrated them thinking that might solve the issue. well it didnt. I decided to fly them anyway (I was not worried about crashing a plane meant to go in combat anyway) and to my surprise I did not burst into flames and they landed even cooler than they were on take off. I noticed that the escs were set with high drag brake (motors are stopped when throttled down) I think the over heating issue comes from that drag brake not deactivating when the motors are sitting idle. I would only recommend these escs for use on planes/projects you dont care about I could see an inexperienced person getting these and burning something up. please buy with caution and keep good air flow over them they get hot when idle.

## Frequently Bought Together

- QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A, 4 pcs)
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-31*