Smart Li-Ion Battery Management System BMS 3S 12V 80A-120A for Energy Storage

Product Specification

Introduction:

The Deligreencs Smart BMS is an advanced lithium-ion battery management system meticulously designed for energy storage battery packs. Manufactured by a team of 100 senior engineers on a 10 million-level production line, this BMS delivers superior safety, reliability, and high-performance processing for complex energy requirements.

Why Choose Deligreencs Smart BMS?

Integrated IC Design: Compact size with large capacity, featuring faster reaction times and intelligent processing to meet complex project requirements.

Sealed Waterproof Protection: Patented sealed design provides exceptional waterproof, dustproof, and shockproof protection, making it perfect for the most demanding environments.

Smart Connectivity: Unlike non-smart BMS, our Smart BMS connects to PC and phone via UART, RS485, and CAN interfaces for real-time battery monitoring and advanced management.

Technical Specifications

Brand: Deligreencs

Model: Li-ion battery 3S 12V 80A

Battery Type: Li-ion (Also available for LFP, NCM, LTO)

Pack Voltage: 12V

Current: 80A-120A (High current handling up to 250A available)

Terminal: Screw terminal

Port: Communication port (UART, RS485, CAN)

MOSFET Resistance: ≤10mΩ (low internal resistance for minimal power loss)

Net Weight: 1KG

Certification: FCC, CE, ROHS

Place of Origin: China

Package: Carton/box

MOQ: 1 piece

Versatile Application Scenarios

Deligreencs Smart BMS is widely used across various industries. Whether you are building a home energy storage system or upgrading your vehicle, our BMS is the ideal replacement for traditional SLA Lead Acid batteries.

Key Applications:

Power Tools, Home Appliances, Consumer Electronics, BOATS, Golf Carts, Submarines, Electric Bicycles/Scooters, Electric Forklifts, Low Speed Electric Vehicles, Rickshaw, Electric Wheelchairs, Solar Energy Storage Systems, and Uninterruptible Power Supplies (UPS).

Certifications & Quality Assurance

We ensure every product can be used with safety and high quality. Our BMS comes with comprehensive international certifications, guaranteeing reliability for your energy storage projects.

Product Packaging & Smart Manufacturing
We maintain a 1000 square meter warehouse with over 1400 different models. Our smart workshop and strict quality control ensure that every single BMS is delivered safely.

Frequently Asked Questions (FAQ)

Port & Electrical Parameters

Q1: What is the difference between a common port and a separate port?

A: A common port means the charge cathode and discharge cathode are connected at the same point (P-). This means the charge current and discharge current share the same path and rating. A separate port has independent charge (C-) and discharge (P-) terminals, allowing different charge and discharge current ratings. Deligreencs offers both configurations — our 3S 12V 80A-120A BMS is available in common port standard, with separate port optional upon request.

Q2: What is the relationship between battery capacity and BMS current?

A: There is no direct relationship between battery capacity (Ah) and BMS current rating (A). The BMS current rating must match your load's continuous and peak current draw, not your battery's capacity. For example, a 100Ah battery with a 500W inverter at 12V draws approximately 42A continuous — you would need a BMS rated for at least 50-60A (with 25-30% margin). Always calculate: Continuous current = Max load (W) ÷ Voltage (V) + 25-30% safety margin.

Q3: What is the MOSFET resistance of this BMS?

A: The Deligreencs 3S 12V BMS features MOSFET resistance of ≤10mΩ (milliohm), which minimizes power loss and heat generation during high-current operation. Lower MOSFET resistance means higher efficiency and longer component lifespan, especially critical for 80A-120A continuous discharge applications.

Q4: Can I use this BMS for both Li-ion and LiFePO4 batteries?

A: Our standard 3S 12V BMS is configured for Li-ion (NCM) chemistry with a nominal voltage of 11.1V (12.6V fully charged). For LiFePO4 applications, you would need a 4S configuration (12.8V nominal). Deligreencs offers BMS solutions for LFP, NCM, and LTO chemistries in 3S to 32S configurations — please specify your chemistry when ordering.

Q5: What type of charger should I use?

A: You must use a specific lithium battery charger — do NOT use a lead-acid charger, as it may lack the precise voltage cutoff required and could damage the BMS or cells. For 3S Li-ion: use a 12.6V CC/CV charger. For 4S LiFePO4: use a 14.6V CC/CV charger. The charger voltage should equal the number of series cells × the per-cell charge voltage (4.2V for Li-ion, 3.65V for LiFePO4).

Features & Technology

Q6: What is the balancing function and how does it work?

A: The balancing function equalizes voltage across all series cells during charging. When any cell reaches the balance trigger voltage (Li-ion: 4.18V), the BMS activates a passive balancing resistor (typically ~35mA discharge) to bring that cell down while others continue charging. This ensures all cells reach full charge safely. 

Note: If cell voltage differences are very large (>0.1V), balancing may not be sufficient — you may need to replace mismatched cells first.

Q7: What communication protocols does this Smart BMS support?

A: Our Smart BMS supports UART, RS485, and CAN interfaces, enabling real-time monitoring via PC or smartphone. This allows integration with inverters, EMS platforms, and fleet management systems. For energy storage applications, the BMS can be configured to communicate with major inverter brands. Please specify your downstream device when ordering so we can confirm protocol compatibility.

Q8: Does this BMS support parallel connection of multiple battery packs?

A: Our standard 3S 12V BMS does not include a built-in parallel module. For parallel pack configurations, Deligreencs offers an optional parallel module that prevents large inrush currents when packs at different voltages are connected. For systems scaling to 4+ parallel packs, we strongly recommend using the parallel module to avoid MOSFET failures and load-sharing issues.

Q9: What is the cell voltage measurement accuracy?

A: Cell voltage accuracy directly affects overcharge/over-discharge protection precision and State of Charge (SOC) estimation. Our Smart BMS achieves ±5mV cell voltage accuracy (better models reach ±2-3mV with 16-bit ADC). For LiFePO4 cells, which have a flat discharge curve, higher accuracy is essential for reliable SOC estimation.

Certifications & Compliance

Q10: What certifications does your BMS carry?

A: Our BMS products carry CE, FCC, RoHS, and UN38.3 certifications, with UL available for specific models. For energy storage applications targeting the US and Canadian markets, additional system-level certifications such as UL 9540 (system safety) and UL 1973 (battery component safety) may be required depending on your end product. We can provide the necessary documentation to support your certification process.

Q11: Do I need IEC 62133 if I use a Chinese BMS?

A: Yes. IEC 62133 is a cell and battery pack safety standard — it applies regardless of BMS origin. A BMS with CE/FCC certification does not automatically make your battery pack IEC 62133 compliant. You will need to test the complete pack (cells + BMS) to this standard if required for your target market.

Troubleshooting

Q12: Why does my 3S BMS keep cutting off power?

A: The most common causes are:

Cell voltage imbalance: If any single cell drops below the undervoltage threshold (~2.0-2.5V) under load, the BMS cuts discharge immediately. Measure each cell string — healthy cells should be within ±0.05V.

Overcurrent protection: Your load's peak current may exceed the BMS rating. Check the BMS label against your device's startup surge current.

Over-temperature: High ambient temperature or poor ventilation can trigger thermal protection.

Q13: My BMS is damaged — how can I tell?

A: Common signs of BMS damage include: no output voltage even with a charged battery, one or more cells not being monitored (showing 0V or full voltage), the BMS heating up abnormally without load, or communication interfaces not responding. If you suspect damage, first verify cell voltages independently with a multimeter. If cells are healthy but the BMS shows abnormal behavior, contact our technical support — we offer a 3-year warranty with free replacement for quality issues.

Q14: Can the BMS repair a damaged battery?

A: No. The BMS is a protection and management device — it prevents damage, but cannot repair already-damaged cells. If your battery has one or more dead cells, the BMS will protect the remaining cells by cutting off the pack, but the dead cells must be replaced. Mixing old and new cells is not recommended.

Purchasing & Customization

Q15: What is your MOQ?

A: 1 piece for standard models.

Q16: Can I customize the BMS parameters (protection thresholds, communication protocol, etc.)?

A: Yes. Our Smart BMS supports flexible parameter adjustment via host computer and mobile app. For OEM projects, we can customize protection thresholds (overvoltage, undervoltage, overcurrent), balancing current, communication protocol message structure, and terminal type. Please provide your specific requirements for a customized quote.

Q17: How long is the lead time?

A: We maintain a 1000 square meter warehouse with over 1400 different models. In-stock items ship within 1-2 business days. Out-of-stock items typically take 3-10 days depending on requirements and quantity.

Q18: How is your warranty?

A: Three-year warranty with free replacement for any quality issues within 1 business day.

Q19: What specifications of BMS do you have?

A: Available in 3S to 32S configurations with 10A to 500A capacity for LFP, NCM, and LTO batteries.

Why Partner with Deligreencs?

One-stop power provider: Lithium battery, active balancer, BMS, charger, and other accessories.

Global Warehouses: Located in Russia, Poland, and the USA ensuring quick delivery.

Factory Direct Pricing: Lifetime technical support and reliable warranty protection.

Looking for distributors: Making DIY Battery Projects Easier!