BMS – The “Smart Guardian” for Split Solar Street Lights
For municipal and commercial projects worldwide, the long-term reliability and safety of split solar street light systems are paramount. The Battery Management System (BMS), as the core component of the system, directly impacts return on investment and operational efficiency. Industry data shows that approximately 65% of solar street light failures are due to battery issues¹, which not only increases maintenance costs but also leads to service interruptions and affects the efficiency of city operations.
The sresky DeltaS series addresses this pain point by independently developing an intelligent BMS system that integrates triple protection for “over-charging, over-discharging, and temperature,” establishing a solid safety barrier for lithium batteries. The system not only extends the battery life to over 10 years, with a cycle efficiency of up to 95%, but also ensures the system’s excellent performance and ultimate safety in harsh environments. The DeltaS BMS system is a reliable and intelligent lighting solution for municipal and commercial projects globally, helping customers achieve sustainable development goals and maximize return on investment.
First Protection: Overcharge Protection – Precise Voltage Monitoring and Dynamic Cutoff to Minimize Business Risks
Overcharging is a significant risk to the safety of lithium batteries, potentially leading to electrolyte decomposition, thermal runaway, or even fire. The DeltaS BMS system adopts precise voltage threshold control and a multi-level hardware protection mechanism to effectively avoid overcharging and safeguard customer assets.
Precise Voltage Threshold Control: Real-time Monitoring, Millisecond Response
The DeltaS BMS system monitors the voltage of the battery cells in the battery pack in real time and sets a strict safety threshold. When the voltage of a single cell exceeds 4.2V or the total voltage of the battery pack exceeds 18V±0.5V, the system automatically cuts off the charging circuit in milliseconds, preventing overcharging from the source and minimizing safety risks.
Multi-level Hardware Protection: Building a Solid Line of Defense to Ensure Operational Continuity
To handle extreme situations, the DeltaS BMS system incorporates a multi-level hardware protection system:
- Primary Protection – MOSFET Control Circuit: In the case of abnormal voltage, the MOSFET control circuit quickly disconnects the solar panels from the batteries and cuts off the charging current.
- Secondary Protection – Hardware Fuse: If the voltage continues to be abnormal, the hardware fuse activates and physically fuses the circuit, isolating the fault and ensuring system safety.
Success Story: Saudi Arabia High-Temperature Project – Proof of Reliability in Harsh Environments
The DeltaS streetlight project in Saudi Arabia demonstrated exceptional overcharge protection in extreme conditions. Despite the high temperatures affecting the PV panels, the DeltaS BMS system successfully prevented overcharging with a failure rate of <0.3%, far below the industry average. This fully proves the reliability of the DeltaS BMS system in harsh environments, ensuring stable project operation, reducing maintenance costs, and creating greater business value for customers.
Second Protection: Overdischarge Protection – Low Voltage Sleep and Intelligent Wake-up to Optimize Asset Life Cycle
Overdischarge severely damages lithium batteries, shortening battery life, increasing replacement frequency, and directly impacting operating costs. The DeltaS BMS system uses graded voltage threshold management and adaptive wake-up technology to maximize battery life and reduce long-term operating costs.
Graded Voltage Threshold Management: Fine Management, Extending Battery Life
The DeltaS BMS system manages the battery power level in a hierarchical manner:
- Level 1 protection (<20% charge): The system switches to energy-saving mode (70% brightness reduction) to extend lighting time and alert the maintenance team.
- Secondary protection (<9%): The system forces the battery into sleep mode, retaining 5% of the power to maintain basic functions, such as the rain sensor, preventing deep discharge damage to the battery.
Adaptive Wake-Up Technology: Intelligent Management, Reducing Manual Maintenance Requirements
The DeltaS BMS features an adaptive wake-up function. During hibernation, the system automatically checks the solar panel voltage every 24 hours. Once sunlight is detected, the system activates charging and wakes up automatically, reducing maintenance costs and improving management efficiency.
Comparative Advantage: Longer Life, Higher Residual Value – Improved Return on Assets
Compared to traditional lead-acid batteries, DeltaS lithium batteries have significant advantages in overdischarge protection. Traditional lead-acid batteries lose up to 30% of their capacity after overdischarge, shortening their lifespan. DeltaS lithium batteries are protected by the BMS system, with a capacity degradation rate of <5%/year, resulting in longer lifespan, less frequent replacement, and higher salvage value. This translates to higher return on investment for customers.
Third Protection: Temperature Control – 20°C to 60°C Climate Adaptation to Ensure Stable Operation in Global Projects
Temperature is a crucial factor affecting the performance of lithium batteries. Extreme temperatures can lead to degradation and safety issues. The DeltaS BMS system is equipped with a comprehensive temperature control system to ensure stable and efficient battery operation in temperatures ranging from -20°C to 60°C, meeting the needs of global projects.
Dual NTC Sensors for Real-Time Monitoring: A Comprehensive Temperature Monitoring Network
The DeltaS BMS system deploys dual NTC temperature sensors within the battery pack to monitor both surface and ambient temperatures in real time. This comprehensive monitoring network enables precise temperature control.
- High-Temperature Protection (>55°C): The system reduces charging current by 50%;
- >60°C: Charging and discharging are completely stopped to prevent high-temperature damage.
- Low-Temperature Optimization (<0°C): The system activates a pre-heating mode (power consumption <3W) to ensure battery activity in low-temperature environments, guaranteeing normal charging and discharging.
Dynamic Equalization Technology: Fine Control of Temperature Differences to Improve Battery Pack Performance
The DeltaS BMS system uses dynamic equalization technology to maintain temperature differences within ±2°C, avoiding localized overheating or overcooling and improving the overall performance and lifespan of the battery pack. Charge equalization and discharge equalization technologies further optimize battery management, ensuring efficient and stable battery pack operation.
DeltaS BMS Added Value: Intelligent Diagnostics and Remote Management – Improving O&M Efficiency and Reducing Operating Costs
The DeltaS BMS not only offers robust battery protection but also integrates intelligent diagnostic and remote management functions to improve operation and maintenance efficiency, reduce costs, and provide added value for customers.
Instant Fault Code Feedback: Visualized Operation and Maintenance, Rapid Response
The DeltaS BMS system includes an intelligent fault diagnosis function. When an issue occurs, the LED screen instantly displays a fault code (e.g., E01, E03, E05). Maintenance personnel can quickly locate faults via the LED screen or mobile app, boosting maintenance efficiency by 60%, reducing manual inspection costs, and improving response time.
Remote Monitoring of Battery State of Health (SOH): Real-Time Monitoring of the Battery’s Operating Status
The system provides early warnings and helps reduce maintenance risks.
Charge/Discharge Data Export and Analysis: The system optimizes energy management strategies and supports smart city energy planning.
Customized Protection Parameters: Flexibly adapt to different project requirements for refined management (authorization required).
Choose DeltaS to Build a Future-Proof, Secure Energy Network for Smart Cities
The sresky DeltaS split solar street light intelligent BMS system, with core “overcharge-overdischarge-temperature” triple protection, integrates intelligent diagnostics, remote management functions, and international certifications. Choosing DeltaS means opting for a safe, reliable, and efficient energy solution for your smart city project, helping to build a sustainable smart city future together.