ATORCH CW20 Smart Digital Battery Capacity Tester User Manual

1. Product Overview

The ATORCH CW20 is a WiFi-networked intelligent battery Coulomb meter designed to measure and display various parameters of battery packs. It accurately shows voltage, current, power, true capacity, battery temperature, low capacity alarm, low voltage alarm, current voltage curve, electricity statistics, and remaining charge/discharge time.

2. Specifications

• Brand Name: ATORCH
• Model Number: CW20
• DIY Supplies: Electrical
• Certification: CE
• Origin: Mainland China
• Operating Temperature: -20°C ~ +60°C
• Power Supply: DC (requires DC5V independent power supply for operation below 10V)
• Display Type: Analog and Digital, Color 2.0 inches
• Measurement Voltage Range: DC 0-420V
• Measurement Current Range: 0-30A (other versions available: 0.1-100A, 0.2-200A, 0.3-300A, 0.4-400A, 0.5-500A, 0.6-600A)
• Measurement Power Range: 0-12.6KW (up to 252.00KW for 600A model)
• Capacity Range: 0-999999Ah
• Energy Range: 0-999999K*Wh
• Support WIFI: Yes (2.4GHz network only)
• Battery Included: No
• High-concerned chemical: None

2.1. Product Dimensions

2.2. Product Parameter Table

2.3. Product List (30A Version)

• 1x 30A meter WiFi version
• 1x USB power supply cable
• 1x Temperature probe

2.4. Application Scope

The CW20 is widely used for displaying the capacity of any battery from 0 to 420V and for parameter detection of various DC power sources. It is suitable for all types of battery packs, including lithium batteries, lithium iron phosphate, lead-acid batteries, and nickel-hydrogen batteries. Applications include electric vehicles, RVs, cars, emergency power supplies, energy storage power supplies, measuring equipment, medical equipment, and various instruments.

3. Setup

3.1. Wiring Instructions (Excluding Relay Connection)

Use 4-wire wiring for more accurate measurements. The voltage sampling uses ordinary thin wires. For voltages less than 10V, a DC5V power supply is required for independent power supply.

Wiring Principle: Ensure that all current flowing through the battery passes through the bidirectional current sampler shown in the diagram. The current line passing through the load should be as thick as possible and meet the required carrying current of the load. Thicker wire diameter is better.

3.2. Adding Relays for Power-Off Function

To achieve automatic power-off protection for overvoltage, undervoltage, and overcurrent during power testing, connect an additional relay circuit. This function requires a DC5V independent power supply to the relay and the relay package must be purchased separately.

3.3. Wire Selection Guide

Refer to the table below for appropriate wire diameters based on current and copper temperature.

3.4. WiFi Network Setup (for models with WiFi modules)

WiFi connection to the network requires three steps:

1. Download the Smart Life or Tuya APP: Search for "Smart Life" or "Tuya" in your mobile app market (Google Play Market, Apple APP Store).
2. Add "ATorch as WiFi Connected Electricity Meter" (CW20): After powering on, the device's red light flashes and remains on to enter the distribution network mode. The device will wait for a WiFi connection.
3. Smart Life APP Pair Operation Steps:
   • Open the Smart Life app. It will automatically prompt to add a device; click "Add" to proceed.
   • Select the device's working WiFi and click to manually enter the password.
   • Enter the WiFi name and password, then click "Next" to continue.
   • After pairing is completed, click "Next".
   • After a successful WiFi connection, multiple values can be set for remote control.
   • After a successful connection, open the app and it will automatically connect via WiFi.

   Attention: Be sure to turn on Bluetooth and location permissions when adding devices.

4. Operating Instructions

4.1. Basic Device Operations

• The startup information has changed. If you need to turn off information monitoring, long press the "M" key to enter the background and turn off the information prompt.
• Battery percentage (100% full voltage and 0% low battery voltage) and OVP (overvoltage alarm), LVP (low voltage alarm) need to be set separately. They can be set to the same or different values.
• This product uses bidirectional current. A "+" symbol indicates charging, and a "-" symbol indicates discharging. The display has changed to an arrow direction (charging position ← symbol, discharging → symbol).
• If WiFi connection fails, long press the "M" key to enter the background and select the WiFi reset option.
• The system sound can be turned off or on by long pressing the "M" key to enter the background settings.
• Language selection is also available in the background settings by long pressing the "M" key.

4.2. Battery Percentage Testing Modes

You can choose one of two appropriate ways to test your battery percentage:

1. C+D- Mode (Capacity Percentage Test Mode): Charging (C+) capacity adds, and discharging (D-) capacity reduces. This mode requires setting the measured battery capacity value in the product. The capacity measurement displays the current actual capacity of the measured battery after adding during charging and subtracting during discharging.
2. C+D+ Mode (Cumulative Capacity Calculation Mode): Charging (C+) capacity adds, and discharging (D-) capacity also adds (does not reduce). Both values are cumulative. This mode does not require setting the battery capacity value; simply clear the capacity to zero before each test.

Operation Method: Long press the "M" key to enter the background, select "Capacity metering mode," and choose the testing mode you need.

4.3. Battery Level Percentage Color Change Display

This meter allows users to freely set the corresponding full charge voltage value and minimum discharge voltage value for battery types in the background. After calculating the percentage based on the user-set threshold, the system displays the percentage color change through the battery symbol:

• Green: >30% capacity
• Yellow: <30% capacity
• Red: <10% capacity

When the display is within the range of 1% to 100%, the red light on the Power panel lights up, and the relay output interface outputs a high level to control the relay to connect the current path. When it exceeds the range of 1% to 100%, the red light goes out and the relay outputs a low level to disconnect the current path, ensuring safe charging and discharging protection for the battery, avoiding the risk of battery damage due to over-charging and discharging. It can also be used for other purposes of over-voltage and low-voltage disconnection protection.

4.4. Standby Display Modes

The CW20 offers four standby display modes, which can be entered by counting down the standby time according to the system settings. These modes include Default Style, Battery Style, Calendar Time Style, and Screen OFF Style.

4.5. Measurement Data and Capacity Statistics

The device provides real-time management of efficient charging and discharging power, statistics of daily charging and power consumption, and real-time viewing of charging and discharging operation power through the host interface. It records daily, monthly, and annual charging and discharging power data with high measurement and statistical accuracy.

4.6. Multi HD Color Screen Interface Design

The CW20 features a true color screen with multiple functional interface contents, displaying multiple parameters on one screen. Users can switch between different functional interfaces through short button presses.

4.7. Backend Settings

Long press the "M" key to enter the background settings. Use the "+" / "-" keys to select columns and enter parameters for various functions.

4.8. Independent Statistical Function

The device includes an independent statistical interface page for charging and discharging capacity and electricity. This page displays total charging capacity, total discharging capacity, total charging and discharging capacity, total charging energy, total discharging energy, and total charging and discharging energy values, providing detailed and clear data at a glance.

4.9. Mobile APP Functions

The WiFi-connected CW20 meter can be controlled and tested remotely via the Smart Life app on your mobile phone. The app covers functional control, battery power data detection, charging and discharging curves, and daily/monthly/annual electricity column statistics.

• Increased Battery Percentage Display: Numerical and graphical display.
• Current/Power Display: Charging shows positive values (e.g., 12.0V 1.00A 12.00W), while discharging shows negative values (e.g., 12.0V -1.00A -12.00W).
• Graph Curve: Real-time data can be viewed, and data changes in real-time. All data is uploaded to the cloud once an hour and displayed, calculated on average every hour.
• Relay Switch: An app-controlled switch for the relay is available (requires long pressing the "+" or "-" key on the device side to turn on/off). This function is only active if the relay package is purchased.

4.10. PC Software Functions

The CW20 supports PC computer upper online functions via HID data cable, Bluetooth APP functions, and WiFi Smart Life APP functions.

• PC Computers: Can read device current, voltage, power, capacity, and other data, and export XLS table data.
• Bluetooth App: Can read device current, voltage, power, capacity, and other data, and export XLS table data.
• WiFi App: Can only view data and curve data, and cannot export data.

5. Maintenance

5.1. Firmware Upgrade

The CW20 supports lifetime free firmware updates via WiFi networking remote or PC HID connection.

5.2. PC HID Firmware Upgrade Instructions

1. Before upgrading the firmware: Hold down the "-" key without releasing it while the device is not powered on.



2. Insert HID port: Connect the HID port to your PC computer.



3. Enter HID-PC computer upgrade mode interface: The device display will show "Product upgrading...".



4. Open the DT20 program software (Computer): Launch the ATORCH BerFang System APP.



5. Open the firmware upgrade window: In the software, navigate to the firmware upgrade section.
6. Load upgrade firmware (.bin file): Select the appropriate firmware file.
7. Upgrading in progress: The software will show the upgrade progress.
8. Upgrade successful: The device will enter the boot interface upon successful upgrade.

6. Troubleshooting

6.1. Four-Fold Alarm Prompt

The CW20 features a dual alarm with sound and display for over-voltage, low-voltage, over-power, and over-temperature conditions. Long press the "M/OK" button to enter the backend system settings for these thresholds. If a probe exceeds the temperature threshold, the device will display an alarm message and an internal buzzer will beep to remind users to charge the battery in a timely manner, preventing battery damage.

6.2. Frequently Asked Questions (FAQ)

• Can a PC connect multiple devices online?
  Answer: No, a computer can only connect to one device through USB. If multiple devices are needed to view simultaneously, please prepare multiple computers to connect.
• Can mobile apps add multiple devices?
  Answer: Yes, you can download and install the Smart Life or Tuya app, pair it with WiFi, and add each device to observe the measurement data of different devices.
• Can I view the data curve data?
  Answer: Yes, you can view the current/voltage/power/energy/CPU temperature data curve.
• Does the device need to be powered independently by DC5V?
  Answer: Yes, it is necessary. Due to the WiFi module, a USB DC 5V power supply is required to power the device in order to work.
• Why does the connecting relay not work?
  Answer: If a relay is connected, the USB DC5V power supply needs to be plugged into the HID interface for the relay to function.
• Do I need to turn on Bluetooth and location information (GPS) when connecting to the WiFi app on my phone?
  Answer: Yes, Bluetooth and location information (GPS) must be turned on to allow the app to function correctly.

7. User Tips

• Always ensure the CW20 meter receives independent DC5V power supply if the measured voltage is below 10V, especially when using the WiFi module.
• When setting battery percentage and alarm thresholds (OVP, LVP), carefully consider your battery type and application to prevent over-charging or over-discharging.
• For accurate capacity testing, remember to reset the capacity to zero by long-pressing the "+" and "-" keys simultaneously before starting a new test, especially in C+D+ mode.
• If you experience WiFi connection issues, try resetting the WiFi via the device's backend settings.
• Keep your device's firmware updated for the best performance and latest features. Refer to the official ATORCH website for the latest software and firmware.

8. Support

For detailed instructions, PC software, and Android APP downloads, please visit the official ATORCH website:

• User Manual & Software Download Link: http://en.atorch.cn/NewsDetail.aspx?ID=90
• Direct PDF User Manual: http://en.atorch.cn/upload/20250613110332.pdf
• iOS APP: Search "Smart Life" or "Tuya" on the iPhone App Store.
• Android APP: Search "Smart Life" or "Tuya" on Google Play.

For any further assistance, please refer to the comprehensive user manual available on the ATORCH website.