1. Вовед
This manual provides essential information for the safe and effective installation, operation, and maintenance of your DALY Smart BMS 4S 12V 400A. Please read this manual thoroughly before using the product to ensure optimal performance and longevity of your LifePO4 lithium battery pack.
2. Производот завршиview
The DALY Smart BMS (Battery Management System) is designed to protect and manage 4-series (4S) 12V LifePO4 lithium battery packs with a 400A current rating. It integrates advanced protection features, communication capabilities via WiFi and CAN 485, and remote monitoring through a dedicated mobile application or PC software. This system ensures the safety, stability, and extended lifespan of your battery.

Image 1: DALY Smart BMS 4S 12V 400A with WiFi module and mobile application interface.
3. Клучни карактеристики
- Подобрена безбедност на батеријата: Offers comprehensive protection against overcharging, over-discharging, overcurrent, short circuits, and extreme temperatures, safeguarding your battery pack.
- 2-in-1 Bluetooth/Wi-Fi Dongle: Enables easy connection to the mobile app via Bluetooth for local control. For long-distance monitoring and control, switch to Wi-Fi (requires connection to a Wi-Fi router).
- Remote Monitoring & Parameter Adjustment: Monitor battery status and adjust parameters remotely via the mobile app or PC software, suitable for various applications including home use, travel, or trolling motors.
- Parallel Circuit Support: The built-in parallel circuit supports the parallel use of multiple battery packs and 485/CAN Bus parallel communication, ensuring compatibility with mainstream inverters.
- Цврст дизајн: Features high current resistance, small size for easy installation, and low temperature rise during operation.
- Интегрирано показно светло: Provides visual feedback on the BMS's working condition.
4. Содржина на пакетот
По распакувањето, проверете дали сите предмети наведени подолу се присутни и во добра состојба:

Image 2: Visual representation of the DALY Smart BMS 4S 12V 400A package contents.
| Ставка | Количина |
|---|---|
| S-type Smart BMS (4S 12V 400A) | 1 |
| Прирачник | 1 |
| B-P-Output Line | 2 |
| 2-in-1 BT/Wi-Fi Dongle | 1 |
| SampЛинг кабел | 1 |
| NTC (сензор за температура) | 1 |
| CAN/485 5-pin Cable | 1 |
5. Setup: Installation and Wiring
Careful installation and wiring are crucial for the proper function and safety of your BMS. Follow these steps precisely:

Image 3: Detailed wiring diagram for the DALY Smart BMS 4S 12V 400A.
- Solder Sampling Cables: The first black cable in the sampling cable set connects to the negative terminal of the battery (B-). The second cable (red) connects to the positive terminal of the first string of batteries. Continue this pattern for all subsequent strings until all cables are connected to their respective positive terminals.
- Проверете ги каблите: After connecting the sampling cables, use a multimeter to measure the voltage between two adjacent cables starting from the header. Ensure there are no incorrect connections or missing connections.
- Connect Output Wires: Connect the B- wire of the BMS to the total negative terminal of the battery pack. Then, plug the sampling cable into the BMS. After activating the BMS, confirm that the voltage (батерија волtage) between B+ and B- and the voltage between P+ and P- are consistent.
Important: The BMS will not activate until a charge is applied to the battery pack through the BMS. Ensure your cells are pre-charged for storage before connecting.
6. Упатства за работа
The DALY Smart BMS offers intelligent monitoring and control through its dedicated application and communication modules.
6.1 Mobile Application and PC Software

Image 4: Screenshot of the DALY Smart BMS mobile application, displaying various battery parameters.
The 'SMART BMS' app allows you to view and set various battery parameters. It supports both iOS and Android systems and automatically switches with the system language. The app displays key information such as:
- Држава на полнење (СПЦ)
- Voltage
- Електрична струја
- Температура
- аларм Статус
- Број на циклус
Connect the 2-in-1 Bluetooth/Wi-Fi dongle to the BMS. Use Bluetooth for local monitoring. For remote monitoring, connect the dongle to a Wi-Fi router, and the BMS data will be accessible via the cloud platform.
6.2 Паралелно поврзување
The BMS supports parallel connection of multiple battery packs, allowing for safe expansion of your energy storage system. This feature, combined with 485/CAN Bus parallel communication, ensures compatibility with various inverter systems.
Видео 1: Оверview of the DALY S-series Smart BMS features, including parallel connection, high current resistance, and smart monitoring capabilities.
7. Одржување
To ensure the longevity and optimal performance of your DALY Smart BMS and battery pack, consider the following maintenance guidelines:
- Редовно следење: Periodically check the battery parameters via the mobile app or PC software to identify any anomalies early.
- Еколошки услови: Ensure the BMS operates within its specified temperature range (charging: -35 to 75°C, discharging: -35 to 75°C) and avoid exposure to excessive moisture or dust. The BMS is designed to be moisture-proof and anti-vibration.
- Интегритет на поврзувањето: Периодично проверувајте ги сите жичени врски за затегнатост и корозија. Лабавите врски може да доведат до лоши перформанси или безбедносни ризици.
- Ажурирања на софтверот: Keep the mobile application and BMS firmware updated to benefit from the latest features and improvements.
- Чистење: Gently clean the exterior of the BMS with a dry, soft cloth if necessary. Do not use liquids or abrasive cleaners.
8 Смена на проблеми
If you encounter issues with your DALY Smart BMS, refer to the following common troubleshooting steps:
- BMS не се активира: Ensure a charge is applied to the battery pack through the BMS. The BMS typically requires an initial charge to 'wake up' and become operational.
- Проблеми со поврзувањето на апликацијата:
- For Bluetooth: Ensure the dongle is properly connected, Bluetooth is enabled on your device, and you are within range.
- For Wi-Fi: Verify the dongle is connected to a stable Wi-Fi network and the network has internet access for remote monitoring.
- Неточно томtage Readings/Balancing Issues: Проверете ги уште еднаш сите sampling cable connections to the battery cells. Incorrect wiring is a common cause of inaccurate readings or poor cell balancing.
- Battery Shutting Down Unexpectedly: This could indicate a protection trigger (e.g., over-discharge, overcurrent, temperature). Check the app for alarm messages. Ensure your load is within the BMS's specified limits.
- BMS Not Detected by App: If the BMS has been idle for an extended period, it might enter a deep sleep mode. Try pressing the button on the Bluetooth/Wi-Fi module to wake it up.
If the problem persists after following these steps, please contact DALY customer support for further assistance.
9. Спецификации
Detailed technical specifications for the DALY Smart BMS 4S 12V 400A:

Image 5: Visual representation of the DALY Smart BMS 4S 12V 400A specifications.
| Параметар | Вредност |
|---|---|
| Тип на производ | LiFePO4 4S 400A common port with balance |
| Струја на празнење | 400 А |
| Overdischarge Current | 600 ± 12А |
| Струја за полнење | 400 А |
| Overcharge Current | 600 ± 12А |
| Преполнување Voltage | 3.75V ± 0.05V (Can be set) |
| Overdischarge Voltage | 2.2V ± 0.05V (Can be set) |
| Полнење Voltage | 14.6V |
| Модел | R10S (3~10S) |
| Димензии (Д x Ш x В) | 183 x 108 x 26 mm (7.2 x 4.25 x 1.02 инчи) |
| Излезна жица | 1AWG*2/200mm |
| Кабел | 24AWG/300~450mm |
| Тежина | 600~700g (1.32~1.54 pounds) |
| Работна температура | Charging: -35 to 75°C, Discharging: -35 to 75°C |
| Температура на складирање | -40 до 85°C |
| Сертификати | ISO/FCC/RoHS/PSE/CE APPROVED |
10. Гаранција и поддршка
The DALY Smart BMS 4S 12V 400A comes with a 3 година гаранција од датумот на купување. Оваа гаранција ги покрива дефектите на материјалите и изработката при нормална употреба.
For technical support, warranty claims, or any questions regarding the product, please contact DALY customer service. Refer to the contact information provided with your purchase or visit the official DALY webсајт за ресурси за поддршка.





